/*******************************************************************************
* Copyright (c) 2000, 2009 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.graphics;
import org.eclipse.swt.internal.wpf.*;
import org.eclipse.swt.*;
/**
* Class <code>GC</code> is where all of the drawing capabilities that are
* supported by SWT are located. Instances are used to draw on either an
* <code>Image</code>, a <code>Control</code>, or directly on a <code>Display</code>.
* <dl>
* <dt><b>Styles:</b></dt>
* <dd>LEFT_TO_RIGHT, RIGHT_TO_LEFT</dd>
* </dl>
*
* <p>
* The SWT drawing coordinate system is the two-dimensional space with the origin
* (0,0) at the top left corner of the drawing area and with (x,y) values increasing
* to the right and downward respectively.
* </p>
*
* <p>
* The result of drawing on an image that was created with an indexed
* palette using a color that is not in the palette is platform specific.
* Some platforms will match to the nearest color while other will draw
* the color itself. This happens because the allocated image might use
* a direct palette on platforms that do not support indexed palette.
* </p>
*
* <p>
* Application code must explicitly invoke the <code>GC.dispose()</code>
* method to release the operating system resources managed by each instance
* when those instances are no longer required. This is <em>particularly</em>
* important on Windows95 and Windows98 where the operating system has a limited
* number of device contexts available.
* </p>
*
* <p>
* Note: Only one of LEFT_TO_RIGHT and RIGHT_TO_LEFT may be specified.
* </p>
*
* @see org.eclipse.swt.events.PaintEvent
* @see <a href="http://www.eclipse.org/swt/snippets/#gc">GC snippets</a>
* @see <a href="http://www.eclipse.org/swt/examples.php">SWT Examples: GraphicsExample, PaintExample</a>
* @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
*/
public final class GC extends Resource {
/**
* the handle to the OS device context
* (Warning: This field is platform dependent)
* <p>
* <b>IMPORTANT:</b> This field is <em>not</em> part of the SWT
* public API. It is marked public only so that it can be shared
* within the packages provided by SWT. It is not available on all
* platforms and should never be accessed from application code.
* </p>
*
* @noreference This field is not intended to be referenced by clients.
*/
public int handle;
Drawable drawable;
GCData data;
static final int FOREGROUND = 1 << 0;
static final int BACKGROUND = 1 << 1;
static final int FONT = 1 << 2;
static final int LINE_STYLE = 1 << 3;
static final int LINE_WIDTH = 1 << 4;
static final int LINE_CAP = 1 << 5;
static final int LINE_JOIN = 1 << 6;
static final int LINE_MITERLIMIT = 1 << 7;
static final int ALPHA = 1 << 8;
static final int CLIPPING = 1 << 9;
static final int TRANSFORM = 1 << 10;
static final int DRAW = FOREGROUND | LINE_STYLE | LINE_WIDTH | LINE_CAP | LINE_JOIN | ALPHA | CLIPPING | TRANSFORM;
static final int FILL = BACKGROUND | ALPHA | CLIPPING | TRANSFORM;
static final int IMAGE = ALPHA | CLIPPING | TRANSFORM;
static final double[] LINE_DOT_ZERO = new double[]{3, 3};
static final double[] LINE_DASH_ZERO = new double[]{18, 6};
static final double[] LINE_DASHDOT_ZERO = new double[]{9, 6, 3, 6};
static final double[] LINE_DASHDOTDOT_ZERO = new double[]{9, 3, 3, 3, 3, 3};
/**
* Prevents uninitialized instances from being created outside the package.
*/
GC() {
}
/**
* Constructs a new instance of this class which has been
* configured to draw on the specified drawable. Sets the
* foreground color, background color and font in the GC
* to match those in the drawable.
* <p>
* You must dispose the graphics context when it is no longer required.
* </p>
* @param drawable the drawable to draw on
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the drawable is null</li>
* <li>ERROR_NULL_ARGUMENT - if there is no current device</li>
* <li>ERROR_INVALID_ARGUMENT
* - if the drawable is an image that is not a bitmap or an icon
* - if the drawable is an image or printer that is already selected
* into another graphics context</li>
* </ul>
* @exception SWTError <ul>
* <li>ERROR_NO_HANDLES if a handle could not be obtained for GC creation</li>
* <li>ERROR_THREAD_INVALID_ACCESS if not called from the thread that created the drawable</li>
* </ul>
*/
public GC(Drawable drawable) {
this(drawable, SWT.NONE);
}
/**
* Constructs a new instance of this class which has been
* configured to draw on the specified drawable. Sets the
* foreground color, background color and font in the GC
* to match those in the drawable.
* <p>
* You must dispose the graphics context when it is no longer required.
* </p>
*
* @param drawable the drawable to draw on
* @param style the style of GC to construct
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the drawable is null</li>
* <li>ERROR_NULL_ARGUMENT - if there is no current device</li>
* <li>ERROR_INVALID_ARGUMENT
* - if the drawable is an image that is not a bitmap or an icon
* - if the drawable is an image or printer that is already selected
* into another graphics context</li>
* </ul>
* @exception SWTError <ul>
* <li>ERROR_NO_HANDLES if a handle could not be obtained for GC creation</li>
* <li>ERROR_THREAD_INVALID_ACCESS if not called from the thread that created the drawable</li>
* </ul>
*
* @since 2.1.2
*/
public GC(Drawable drawable, int style) {
if (drawable == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
GCData data = new GCData ();
data.style = checkStyle(style);
int hDC = drawable.internal_new_GC(data);
Device device = data.device;
if (device == null) device = Device.getDevice();
if (device == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
this.device = data.device = device;
init (drawable, data, hDC);
init();
}
static int checkStyle(int style) {
if ((style & SWT.LEFT_TO_RIGHT) != 0) style &= ~SWT.RIGHT_TO_LEFT;
return style & (SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT);
}
void checkGC(int mask) {
int state = data.state;
if ((state & mask) == mask) return;
state = (state ^ mask) & mask;
data.state |= mask;
if ((state & (FOREGROUND | LINE_WIDTH | LINE_STYLE | LINE_JOIN | LINE_CAP | LINE_MITERLIMIT)) != 0) {
int pen = data.pen;
if (pen != 0) OS.GCHandle_Free(pen);
pen = data.pen = OS.gcnew_Pen();
int brush;
Pattern pattern = data.foregroundPattern;
if (pattern != null) {
brush = pattern.handle;
} else {
int foreground = data.foreground;
brush = OS.gcnew_SolidColorBrush(foreground);
if (brush == 0) SWT.error(SWT.ERROR_NO_HANDLES);
}
OS.Pen_Brush(pen, brush);
if (pattern == null) OS.GCHandle_Free(brush);
float width = data.lineWidth;
OS.Pen_Thickness(pen, width == 0 ? 1 : width);
double[] dashes = null;
int dashStyle = 0;
switch (data.lineStyle) {
case SWT.LINE_SOLID: dashStyle = OS.DashStyles_Solid(); break;
case SWT.LINE_DOT: if (width == 0) dashes = LINE_DOT_ZERO; else dashStyle = OS.DashStyles_Dot(); break;
case SWT.LINE_DASH: if (width == 0) dashes = LINE_DASH_ZERO; else dashStyle = OS.DashStyles_Dash(); break;
case SWT.LINE_DASHDOT: if (width == 0) dashes = LINE_DASHDOT_ZERO; else dashStyle = OS.DashStyles_DashDot(); break;
case SWT.LINE_DASHDOTDOT: if (width == 0) dashes = LINE_DASHDOTDOT_ZERO; else dashStyle = OS.DashStyles_DashDotDot(); break;
case SWT.LINE_CUSTOM: {
if (data.lineDashes != null) {
dashes = new double[data.lineDashes.length * 2];
for (int i = 0; i < data.lineDashes.length; i++) {
double dash = (double)data.lineDashes[i] / Math.max (1, width);
dashes[i] = dash;
dashes[i + data.lineDashes.length] = dash;
}
} else {
dashStyle = OS.DashStyles_Solid();
}
}
}
if (dashes != null) {
int list = OS.gcnew_DoubleCollection(dashes.length);
for (int i = 0; i < dashes.length; i++) {
OS.DoubleCollection_Add(list, dashes[i]);
}
dashStyle = OS.gcnew_DashStyle(list, data.lineDashesOffset);
OS.GCHandle_Free(list);
}
OS.Pen_DashStyle(pen, dashStyle);
OS.GCHandle_Free(dashStyle);
int joinStyle = 0;
switch (data.lineJoin) {
case SWT.JOIN_MITER: joinStyle = OS.PenLineJoin_Miter; break;
case SWT.JOIN_BEVEL: joinStyle = OS.PenLineJoin_Bevel; break;
case SWT.JOIN_ROUND: joinStyle = OS.PenLineJoin_Round; break;
}
OS.Pen_LineJoin(pen, joinStyle);
int capStyle = OS.PenLineCap_Flat;
switch (data.lineCap) {
case SWT.CAP_FLAT: capStyle = OS.PenLineCap_Flat; break;
case SWT.CAP_ROUND: capStyle = OS.PenLineCap_Round; break;
case SWT.CAP_SQUARE: capStyle = OS.PenLineCap_Square; break;
}
OS.Pen_DashCap(pen, capStyle);
OS.Pen_EndLineCap(pen, capStyle);
OS.Pen_StartLineCap(pen, capStyle);
OS.Pen_MiterLimit(pen, data.lineMiterLimit);
}
if ((state & BACKGROUND) != 0) {
if (data.brush != 0) OS.GCHandle_Free(data.brush);
data.brush = 0;
Pattern pattern = data.backgroundPattern;
if (pattern != null) {
data.currentBrush = pattern.handle;
} else {
int background = data.background;
int brush = OS.gcnew_SolidColorBrush(background);
if (brush == 0) SWT.error(SWT.ERROR_NO_HANDLES);
data.currentBrush = data.brush = brush;
}
}
if ((state & (ALPHA | CLIPPING | TRANSFORM)) != 0) {
for (int i = 0; i < data.pushCount; i++) OS.DrawingContext_Pop(handle);
data.pushCount = 0;
if (data.alpha != 0xFF) {
OS.DrawingContext_PushOpacity(handle, (data.alpha & 0xFF) / (double)0xFF);
data.pushCount++;
}
if (data.clip != 0) {
OS.DrawingContext_PushClip(handle, data.clip);
data.pushCount++;
}
if (data.transform != 0) {
OS.DrawingContext_PushTransform(handle, data.transform);
data.pushCount++;
}
}
}
/**
* Copies a rectangular area of the receiver at the specified
* position into the image, which must be of type <code>SWT.BITMAP</code>.
*
* @param image the image to copy into
* @param x the x coordinate in the receiver of the area to be copied
* @param y the y coordinate in the receiver of the area to be copied
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the image is null</li>
* <li>ERROR_INVALID_ARGUMENT - if the image is not a bitmap or has been disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void copyArea(Image image, int x, int y) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (image == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (image.type != SWT.BITMAP || image.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
//TODO - implement copyArea
}
/**
* Copies a rectangular area of the receiver at the source
* position onto the receiver at the destination position.
*
* @param srcX the x coordinate in the receiver of the area to be copied
* @param srcY the y coordinate in the receiver of the area to be copied
* @param width the width of the area to copy
* @param height the height of the area to copy
* @param destX the x coordinate in the receiver of the area to copy to
* @param destY the y coordinate in the receiver of the area to copy to
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void copyArea(int srcX, int srcY, int width, int height, int destX, int destY) {
copyArea(srcX, srcY, width, height, destX, destY, true);
}
/**
* Copies a rectangular area of the receiver at the source
* position onto the receiver at the destination position.
*
* @param srcX the x coordinate in the receiver of the area to be copied
* @param srcY the y coordinate in the receiver of the area to be copied
* @param width the width of the area to copy
* @param height the height of the area to copy
* @param destX the x coordinate in the receiver of the area to copy to
* @param destY the y coordinate in the receiver of the area to copy to
* @param paint if <code>true</code> paint events will be generated for old and obscured areas
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @since 3.1
*/
public void copyArea(int srcX, int srcY, int width, int height, int destX, int destY, boolean paint) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
//TODO - implement copyArea
// /*
// * Feature in WinCE. The function WindowFromDC is not part of the
// * WinCE SDK. The fix is to remember the HWND.
// */
// int hwnd = data.hwnd;
// if (hwnd == 0) {
// OS.BitBlt(handle, destX, destY, width, height, handle, srcX, srcY, OS.SRCCOPY);
// } else {
// RECT lprcClip = null;
// int hrgn = OS.CreateRectRgn(0, 0, 0, 0);
// if (OS.GetClipRgn(handle, hrgn) == 1) {
// lprcClip = new RECT();
// OS.GetRgnBox(hrgn, lprcClip);
// }
// OS.DeleteObject(hrgn);
// RECT lprcScroll = new RECT();
// OS.SetRect(lprcScroll, srcX, srcY, srcX + width, srcY + height);
// int flags = paint ? OS.SW_INVALIDATE | OS.SW_ERASE : 0;
// int res = OS.ScrollWindowEx(hwnd, destX - srcX, destY - srcY, lprcScroll, lprcClip, 0, null, flags);
//
// /*
// * Feature in WinCE. ScrollWindowEx does not accept combined
// * vertical and horizontal scrolling. The fix is to do a
// * BitBlt and invalidate the appropriate source area.
// */
// if (res == 0 && OS.IsWinCE) {
// OS.BitBlt(handle, destX, destY, width, height, handle, srcX, srcY, OS.SRCCOPY);
// if (paint) {
// int deltaX = destX - srcX, deltaY = destY - srcY;
// boolean disjoint = (destX + width < srcX) || (srcX + width < destX) || (destY + height < srcY) || (srcY + height < destY);
// if (disjoint) {
// OS.InvalidateRect(hwnd, lprcScroll, true);
// } else {
// if (deltaX != 0) {
// int newX = destX - deltaX;
// if (deltaX < 0) newX = destX + width;
// OS.SetRect(lprcScroll, newX, srcY, newX + Math.abs(deltaX), srcY + height);
// OS.InvalidateRect(hwnd, lprcScroll, true);
// }
// if (deltaY != 0) {
// int newY = destY - deltaY;
// if (deltaY < 0) newY = destY + height;
// OS.SetRect(lprcScroll, srcX, newY, srcX + width, newY + Math.abs(deltaY));
// OS.InvalidateRect(hwnd, lprcScroll, true);
// }
// }
// }
// }
// }
}
void destroy() {
int brush = data.brush;
if (brush != 0) OS.GCHandle_Free(brush);
data.brush = 0;
int pen = data.pen;
if (pen != 0) OS.GCHandle_Free(pen);
data.pen = 0;
int clip = data.clip;
if (clip != 0) OS.GCHandle_Free(clip);
data.clip = 0;
int transform = data.transform;
if (transform != 0) OS.GCHandle_Free(transform);
data.transform = 0;
Image image = data.image;
if (image != null) image.memGC = null;
if (drawable != null) drawable.internal_dispose_GC(handle, data);
drawable = null;
handle = 0;
data.image = null;
data = null;
}
/**
* Draws the outline of a circular or elliptical arc
* within the specified rectangular area.
* <p>
* The resulting arc begins at <code>startAngle</code> and extends
* for <code>arcAngle</code> degrees, using the current color.
* Angles are interpreted such that 0 degrees is at the 3 o'clock
* position. A positive value indicates a counter-clockwise rotation
* while a negative value indicates a clockwise rotation.
* </p><p>
* The center of the arc is the center of the rectangle whose origin
* is (<code>x</code>, <code>y</code>) and whose size is specified by the
* <code>width</code> and <code>height</code> arguments.
* </p><p>
* The resulting arc covers an area <code>width + 1</code> pixels wide
* by <code>height + 1</code> pixels tall.
* </p>
*
* @param x the x coordinate of the upper-left corner of the arc to be drawn
* @param y the y coordinate of the upper-left corner of the arc to be drawn
* @param width the width of the arc to be drawn
* @param height the height of the arc to be drawn
* @param startAngle the beginning angle
* @param arcAngle the angular extent of the arc, relative to the start angle
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void drawArc (int x, int y, int width, int height, int startAngle, int arcAngle) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
checkGC(DRAW);
if (width < 0) {
x = x + width;
width = -width;
}
if (height < 0) {
y = y + height;
height = -height;
}
if (width == 0 || height == 0 || arcAngle == 0) return;
double offset = 0;
if (data.lineWidth == 0 || (data.lineWidth % 2) == 1) offset = 0.5;
if (arcAngle >= 360 || arcAngle <= -360) {
int center = OS.gcnew_Point(x + offset + width / 2f, y + offset + height / 2f);
OS.DrawingContext_DrawEllipse(handle, 0, data.pen, center, width / 2f, height / 2f);
OS.GCHandle_Free(center);
return;
}
boolean isNegative = arcAngle < 0;
boolean isLargeAngle = arcAngle > 180 || arcAngle < -180;
arcAngle = arcAngle + startAngle;
if (isNegative) {
// swap angles
int tmp = startAngle;
startAngle = arcAngle;
arcAngle = tmp;
}
double x1 = Math.cos(startAngle * Math.PI / 180) * width/2.0 + x + offset + width/2.0;
double y1 = -1 * Math.sin(startAngle * Math.PI / 180) * height/2.0 + y + offset + height/2.0;
double x2 = Math.cos(arcAngle * Math.PI / 180) * width/2.0 + x + offset + width/2.0;
double y2 = -1 * Math.sin(arcAngle * Math.PI / 180) * height/2.0 + y + offset + height/2.0;
int startPoint = OS.gcnew_Point(x1, y1);
int endPoint = OS.gcnew_Point(x2, y2);
int size = OS.gcnew_Size(width / 2.0, height / 2.0);
int arc = OS.gcnew_ArcSegment(endPoint, size, 0, isLargeAngle, OS.SweepDirection_Clockwise, true);
int figure = OS.gcnew_PathFigure();
OS.PathFigure_StartPoint(figure, startPoint);
int segments = OS.PathFigure_Segments(figure);
OS.PathSegmentCollection_Add(segments, arc);
int path = OS.gcnew_PathGeometry();
int figures = OS.PathGeometry_Figures(path);
OS.PathFigureCollection_Add(figures, figure);
OS.DrawingContext_DrawGeometry(handle, 0, data.pen, path);
OS.GCHandle_Free(figures);
OS.GCHandle_Free(path);
OS.GCHandle_Free(segments);
OS.GCHandle_Free(figure);
OS.GCHandle_Free(arc);
OS.GCHandle_Free(size);
OS.GCHandle_Free(endPoint);
OS.GCHandle_Free(startPoint);
}
/**
* Draws a rectangle, based on the specified arguments, which has
* the appearance of the platform's <em>focus rectangle</em> if the
* platform supports such a notion, and otherwise draws a simple
* rectangle in the receiver's foreground color.
*
* @param x the x coordinate of the rectangle
* @param y the y coordinate of the rectangle
* @param width the width of the rectangle
* @param height the height of the rectangle
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @see #drawRectangle(int, int, int, int)
*/
public void drawFocus (int x, int y, int width, int height) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
//TODO - implement drawFocus
}
/**
* Draws the given image in the receiver at the specified
* coordinates.
*
* @param image the image to draw
* @param x the x coordinate of where to draw
* @param y the y coordinate of where to draw
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the image is null</li>
* <li>ERROR_INVALID_ARGUMENT - if the image has been disposed</li>
* <li>ERROR_INVALID_ARGUMENT - if the given coordinates are outside the bounds of the image</li>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
* @exception SWTError <ul>
* <li>ERROR_NO_HANDLES - if no handles are available to perform the operation</li>
* </ul>
*/
public void drawImage(Image image, int x, int y) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (image == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
if (image.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
drawImage(image, 0, 0, -1, -1, x, y, -1, -1, true);
}
/**
* Copies a rectangular area from the source image into a (potentially
* different sized) rectangular area in the receiver. If the source
* and destination areas are of differing sizes, then the source
* area will be stretched or shrunk to fit the destination area
* as it is copied. The copy fails if any part of the source rectangle
* lies outside the bounds of the source image, or if any of the width
* or height arguments are negative.
*
* @param image the source image
* @param srcX the x coordinate in the source image to copy from
* @param srcY the y coordinate in the source image to copy from
* @param srcWidth the width in pixels to copy from the source
* @param srcHeight the height in pixels to copy from the source
* @param destX the x coordinate in the destination to copy to
* @param destY the y coordinate in the destination to copy to
* @param destWidth the width in pixels of the destination rectangle
* @param destHeight the height in pixels of the destination rectangle
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the image is null</li>
* <li>ERROR_INVALID_ARGUMENT - if the image has been disposed</li>
* <li>ERROR_INVALID_ARGUMENT - if any of the width or height arguments are negative.
* <li>ERROR_INVALID_ARGUMENT - if the source rectangle is not contained within the bounds of the source image</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
* @exception SWTError <ul>
* <li>ERROR_NO_HANDLES - if no handles are available to perform the operation</li>
* </ul>
*/
public void drawImage(Image image, int srcX, int srcY, int srcWidth, int srcHeight, int destX, int destY, int destWidth, int destHeight) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (srcWidth == 0 || srcHeight == 0 || destWidth == 0 || destHeight == 0) return;
if (srcX < 0 || srcY < 0 || srcWidth < 0 || srcHeight < 0 || destWidth < 0 || destHeight < 0) {
SWT.error (SWT.ERROR_INVALID_ARGUMENT);
}
if (image == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
if (image.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
drawImage(image, srcX, srcY, srcWidth, srcHeight, destX, destY, destWidth, destHeight, false);
}
void drawImage(Image image, int srcX, int srcY, int srcWidth, int srcHeight, int destX, int destY, int destWidth, int destHeight, boolean simple) {
checkGC(IMAGE);
int imageHandle = image.handle;
int imgWidth = OS.BitmapSource_PixelWidth(imageHandle);
int imgHeight = OS.BitmapSource_PixelHeight(imageHandle);
if (simple) {
srcWidth = destWidth = imgWidth;
srcHeight = destHeight = imgHeight;
} else {
simple = srcX == 0 && srcY == 0 &&
srcWidth == destWidth && destWidth == imgWidth &&
srcHeight == destHeight && destHeight == imgHeight;
if (srcX + srcWidth > imgWidth || srcY + srcHeight > imgHeight) {
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
}
int mode = 0;
switch (data.interpolation) {
case SWT.DEFAULT: mode = OS.BitmapScalingMode_Unspecified; break;
case SWT.NONE: mode = OS.BitmapScalingMode_LowQuality; break;
case SWT.LOW: mode = OS.BitmapScalingMode_LowQuality; break;
case SWT.HIGH: mode = OS.BitmapScalingMode_HighQuality; break;
default:
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
if (srcX != 0 || srcY != 0 || srcWidth != imgWidth || srcHeight != imgHeight) {
int rect = OS.gcnew_Int32Rect(srcX, srcY, srcWidth, srcHeight);
imageHandle = OS.gcnew_CroppedBitmap(imageHandle, rect);
OS.RenderOptions_SetBitmapScalingMode(imageHandle, mode);
OS.GCHandle_Free(rect);
} else {
if (mode != OS.RenderOptions_GetBitmapScalingMode(imageHandle)) {
imageHandle = OS.Freezable_Clone(imageHandle);
OS.RenderOptions_SetBitmapScalingMode(imageHandle, mode);
}
}
int rect = OS.gcnew_Rect(destX, destY, destWidth, destHeight);
OS.DrawingContext_DrawImage(handle, imageHandle, rect);
OS.GCHandle_Free(rect);
if (image.handle != imageHandle) OS.GCHandle_Free(imageHandle);
}
/**
* Draws a line, using the foreground color, between the points
* (<code>x1</code>, <code>y1</code>) and (<code>x2</code>, <code>y2</code>).
*
* @param x1 the first point's x coordinate
* @param y1 the first point's y coordinate
* @param x2 the second point's x coordinate
* @param y2 the second point's y coordinate
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void drawLine (int x1, int y1, int x2, int y2) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
checkGC(DRAW);
double offset = 0;
if (data.lineWidth == 0 || (data.lineWidth % 2) == 1) offset = 0.5;
int point0 = OS.gcnew_Point(x1 + offset, y1 + offset);
int point1 = OS.gcnew_Point(x2 + offset, y2 + offset);
OS.DrawingContext_DrawLine(handle, data.pen, point0, point1);
OS.GCHandle_Free(point0);
OS.GCHandle_Free(point1);
}
/**
* Draws the outline of an oval, using the foreground color,
* within the specified rectangular area.
* <p>
* The result is a circle or ellipse that fits within the
* rectangle specified by the <code>x</code>, <code>y</code>,
* <code>width</code>, and <code>height</code> arguments.
* </p><p>
* The oval covers an area that is <code>width + 1</code>
* pixels wide and <code>height + 1</code> pixels tall.
* </p>
*
* @param x the x coordinate of the upper left corner of the oval to be drawn
* @param y the y coordinate of the upper left corner of the oval to be drawn
* @param width the width of the oval to be drawn
* @param height the height of the oval to be drawn
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void drawOval (int x, int y, int width, int height) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
checkGC(DRAW);
if (width < 0) {
x = x + width;
width = -width;
}
if (height < 0) {
y = y + height;
height = -height;
}
double offset = 0;
if (data.lineWidth == 0 || (data.lineWidth % 2) == 1) offset = 0.5;
int center = OS.gcnew_Point(x + offset + width / 2f, y + offset + height / 2f);
OS.DrawingContext_DrawEllipse(handle, 0, data.pen, center, width / 2f, height / 2f);
OS.GCHandle_Free(center);
}
/**
* Draws the path described by the parameter.
* <p>
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
* </p>
*
* @param path the path to draw
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the parameter is null</li>
* <li>ERROR_INVALID_ARGUMENT - if the parameter has been disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
* </ul>
*
* @see Path
*
* @since 3.1
*/
public void drawPath (Path path) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (path == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (path.handle == 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
checkGC(DRAW);
//TODO - check offset to draw in the midle of pixel
OS.PathGeometry_FillRule(path.handle, data.fillRule == SWT.FILL_EVEN_ODD ? OS.FillRule_EvenOdd : OS.FillRule_Nonzero);
OS.DrawingContext_DrawGeometry(handle, 0, data.pen, path.handle);
}
/**
* Draws a pixel, using the foreground color, at the specified
* point (<code>x</code>, <code>y</code>).
* <p>
* Note that the receiver's line attributes do not affect this
* operation.
* </p>
*
* @param x the point's x coordinate
* @param y the point's y coordinate
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @since 3.0
*/
public void drawPoint (int x, int y) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
checkGC(DRAW);
int rect = OS.gcnew_Rect(x, y, 1, 1);
int brush = OS.Pen_Brush(data.pen);
OS.DrawingContext_DrawRectangle(handle, brush, 0, rect);
OS.GCHandle_Free(brush);
OS.GCHandle_Free(rect);
}
/**
* Draws the closed polygon which is defined by the specified array
* of integer coordinates, using the receiver's foreground color. The array
* contains alternating x and y values which are considered to represent
* points which are the vertices of the polygon. Lines are drawn between
* each consecutive pair, and between the first pair and last pair in the
* array.
*
* @param pointArray an array of alternating x and y values which are the vertices of the polygon
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT if pointArray is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void drawPolygon(int[] pointArray) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (pointArray == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
checkGC(DRAW);
drawPolyLineSegment(pointArray, true, true);
}
void drawPolyLineSegment(int[] pointArray, boolean closed, boolean stroked) {
if (pointArray.length < 4) return;
int list = OS.gcnew_PointCollection(pointArray.length / 2);
double offset = 0;
if (stroked && (data.lineWidth == 0 || (data.lineWidth % 2) == 1)) offset = 0.5;
for (int i = 2; i < pointArray.length; i += 2) {
int point = OS.gcnew_Point(pointArray[i] + offset, pointArray[i + 1] + offset);
OS.PointCollection_Add(list, point);
OS.GCHandle_Free(point);
}
int poly = OS.gcnew_PolyLineSegment(list, stroked);
OS.GCHandle_Free(list);
int figure = OS.gcnew_PathFigure();
int startPoint = OS.gcnew_Point(pointArray[0] + offset, pointArray[1] + offset);
OS.PathFigure_StartPoint(figure, startPoint);
OS.PathFigure_IsClosed(figure, closed);
int segments = OS.PathFigure_Segments(figure);
OS.PathSegmentCollection_Add(segments, poly);
int path = OS.gcnew_PathGeometry();
// int mode = 0;
// switch (data.antialias) {
// case SWT.DEFAULT:
// case SWT.ON: mode = OS.EdgeMode_Unspecified; break;
// case SWT.OFF: mode = OS.EdgeMode_Aliased; break;
// }
// OS.RenderOptions_SetEdgeMode(path, mode);
if (!stroked) OS.PathGeometry_FillRule(path, data.fillRule == SWT.FILL_EVEN_ODD ? OS.FillRule_EvenOdd : OS.FillRule_Nonzero);
int figures = OS.PathGeometry_Figures(path);
OS.PathFigureCollection_Add(figures, figure);
OS.DrawingContext_DrawGeometry(handle, stroked ? 0 : data.currentBrush, stroked ? data.pen : 0, path);
OS.GCHandle_Free(figures);
OS.GCHandle_Free(path);
OS.GCHandle_Free(segments);
OS.GCHandle_Free(figure);
OS.GCHandle_Free(startPoint);
OS.GCHandle_Free(poly);
}
/**
* Draws the polyline which is defined by the specified array
* of integer coordinates, using the receiver's foreground color. The array
* contains alternating x and y values which are considered to represent
* points which are the corners of the polyline. Lines are drawn between
* each consecutive pair, but not between the first pair and last pair in
* the array.
*
* @param pointArray an array of alternating x and y values which are the corners of the polyline
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the point array is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void drawPolyline(int[] pointArray) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (pointArray == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
checkGC(DRAW);
drawPolyLineSegment(pointArray, false, true);
}
/**
* Draws the outline of the rectangle specified by the arguments,
* using the receiver's foreground color. The left and right edges
* of the rectangle are at <code>x</code> and <code>x + width</code>.
* The top and bottom edges are at <code>y</code> and <code>y + height</code>.
*
* @param x the x coordinate of the rectangle to be drawn
* @param y the y coordinate of the rectangle to be drawn
* @param width the width of the rectangle to be drawn
* @param height the height of the rectangle to be drawn
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void drawRectangle (int x, int y, int width, int height) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
checkGC(DRAW);
if (width < 0) {
x = x + width;
width = -width;
}
if (height < 0) {
y = y + height;
height = -height;
}
double offset = 0;
if (data.lineWidth == 0 || (data.lineWidth % 2) == 1) offset = 0.5;
int rect = OS.gcnew_Rect(x + offset, y + offset, width, height);
OS.DrawingContext_DrawRectangle(handle, 0, data.pen, rect);
OS.GCHandle_Free(rect);
}
/**
* Draws the outline of the specified rectangle, using the receiver's
* foreground color. The left and right edges of the rectangle are at
* <code>rect.x</code> and <code>rect.x + rect.width</code>. The top
* and bottom edges are at <code>rect.y</code> and
* <code>rect.y + rect.height</code>.
*
* @param rect the rectangle to draw
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the rectangle is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void drawRectangle (Rectangle rect) {
if (rect == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
drawRectangle (rect.x, rect.y, rect.width, rect.height);
}
/**
* Draws the outline of the round-cornered rectangle specified by
* the arguments, using the receiver's foreground color. The left and
* right edges of the rectangle are at <code>x</code> and <code>x + width</code>.
* The top and bottom edges are at <code>y</code> and <code>y + height</code>.
* The <em>roundness</em> of the corners is specified by the
* <code>arcWidth</code> and <code>arcHeight</code> arguments, which
* are respectively the width and height of the ellipse used to draw
* the corners.
*
* @param x the x coordinate of the rectangle to be drawn
* @param y the y coordinate of the rectangle to be drawn
* @param width the width of the rectangle to be drawn
* @param height the height of the rectangle to be drawn
* @param arcWidth the width of the arc
* @param arcHeight the height of the arc
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void drawRoundRectangle (int x, int y, int width, int height, int arcWidth, int arcHeight) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (arcWidth < 0 || arcHeight < 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
checkGC(DRAW);
if (width < 0) {
x = x + width;
width = -width;
}
if (height < 0) {
y = y + height;
height = -height;
}
if (arcWidth < 0) arcWidth = -arcWidth;
if (arcHeight < 0) arcHeight = -arcHeight;
double offset = 0;
if (data.lineWidth == 0 || (data.lineWidth % 2) == 1) offset = 0.5;
int rect = OS.gcnew_Rect(x + offset, y + offset, width, height);
OS.DrawingContext_DrawRoundedRectangle(handle, 0, data.pen, rect, arcWidth / 2f, arcHeight / 2f);
OS.GCHandle_Free(rect);
}
/**
* Draws the given string, using the receiver's current font and
* foreground color. No tab expansion or carriage return processing
* will be performed. The background of the rectangular area where
* the string is being drawn will be filled with the receiver's
* background color.
*
* @param string the string to be drawn
* @param x the x coordinate of the top left corner of the rectangular area where the string is to be drawn
* @param y the y coordinate of the top left corner of the rectangular area where the string is to be drawn
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the string is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void drawString (String string, int x, int y) {
drawString(string, x, y, false);
}
/**
* Draws the given string, using the receiver's current font and
* foreground color. No tab expansion or carriage return processing
* will be performed. If <code>isTransparent</code> is <code>true</code>,
* then the background of the rectangular area where the string is being
* drawn will not be modified, otherwise it will be filled with the
* receiver's background color.
*
* @param string the string to be drawn
* @param x the x coordinate of the top left corner of the rectangular area where the string is to be drawn
* @param y the y coordinate of the top left corner of the rectangular area where the string is to be drawn
* @param isTransparent if <code>true</code> the background will be transparent, otherwise it will be opaque
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the string is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void drawString (String string, int x, int y, boolean isTransparent) {
drawText(string, x, y, isTransparent ? SWT.DRAW_TRANSPARENT : 0);
}
/**
* Draws the given string, using the receiver's current font and
* foreground color. Tab expansion and carriage return processing
* are performed. The background of the rectangular area where
* the text is being drawn will be filled with the receiver's
* background color.
*
* @param string the string to be drawn
* @param x the x coordinate of the top left corner of the rectangular area where the text is to be drawn
* @param y the y coordinate of the top left corner of the rectangular area where the text is to be drawn
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the string is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void drawText (String string, int x, int y) {
drawText(string, x, y, SWT.DRAW_DELIMITER | SWT.DRAW_TAB);
}
/**
* Draws the given string, using the receiver's current font and
* foreground color. Tab expansion and carriage return processing
* are performed. If <code>isTransparent</code> is <code>true</code>,
* then the background of the rectangular area where the text is being
* drawn will not be modified, otherwise it will be filled with the
* receiver's background color.
*
* @param string the string to be drawn
* @param x the x coordinate of the top left corner of the rectangular area where the text is to be drawn
* @param y the y coordinate of the top left corner of the rectangular area where the text is to be drawn
* @param isTransparent if <code>true</code> the background will be transparent, otherwise it will be opaque
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the string is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void drawText (String string, int x, int y, boolean isTransparent) {
int flags = SWT.DRAW_DELIMITER | SWT.DRAW_TAB;
if (isTransparent) flags |= SWT.DRAW_TRANSPARENT;
drawText(string, x, y, flags);
}
/**
* Draws the given string, using the receiver's current font and
* foreground color. Tab expansion, line delimiter and mnemonic
* processing are performed according to the specified flags. If
* <code>flags</code> includes <code>DRAW_TRANSPARENT</code>,
* then the background of the rectangular area where the text is being
* drawn will not be modified, otherwise it will be filled with the
* receiver's background color.
* <p>
* The parameter <code>flags</code> may be a combination of:
* <dl>
* <dt><b>DRAW_DELIMITER</b></dt>
* <dd>draw multiple lines</dd>
* <dt><b>DRAW_TAB</b></dt>
* <dd>expand tabs</dd>
* <dt><b>DRAW_MNEMONIC</b></dt>
* <dd>underline the mnemonic character</dd>
* <dt><b>DRAW_TRANSPARENT</b></dt>
* <dd>transparent background</dd>
* </dl>
* </p>
*
* @param string the string to be drawn
* @param x the x coordinate of the top left corner of the rectangular area where the text is to be drawn
* @param y the y coordinate of the top left corner of the rectangular area where the text is to be drawn
* @param flags the flags specifying how to process the text
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the string is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void drawText (String string, int x, int y, int flags) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (string == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
int length = string.length ();
if (length == 0) return;
checkGC(FONT | FOREGROUND | ALPHA | CLIPPING | TRANSFORM | ((flags & SWT.DRAW_TRANSPARENT) != 0 ? 0 : BACKGROUND));
char [] buffer = new char [length + 1];
string.getChars(0, length, buffer, 0);
int mask = SWT.DRAW_DELIMITER | SWT.DRAW_TAB | SWT.DRAW_MNEMONIC;
int mnemonic = -1;
if ((flags & mask) != mask) {
for (int i = 0, j = 0; i < buffer.length; i++) {
char c = buffer[i];
switch (c) {
case '&': {
if ((flags & SWT.DRAW_MNEMONIC) != 0) {
if (i + 1 < length) {
if (buffer[i + 1] == '&') {
i++;
} else {
if (mnemonic == -1) mnemonic = j;
}
}
continue;
}
break;
}
case '\r':
case '\n':
if ((flags & SWT.DRAW_DELIMITER) == 0) continue;
break;
case '\t':
if ((flags & SWT.DRAW_TAB) == 0) continue;
break;
}
buffer[j++] = c;
}
}
int str = OS.gcnew_String (buffer);
int culture = OS.CultureInfo_CurrentUICulture();
Font font = data.font;
int direction = (data.style & SWT.RIGHT_TO_LEFT) != 0 ? OS.FlowDirection_RightToLeft : OS.FlowDirection_LeftToRight;
int brush = OS.Pen_Brush(data.pen);
int text = OS.gcnew_FormattedText(str, culture, direction, font.handle, font.size, brush);
int point = OS.gcnew_Point(x, y);
if (mnemonic != -1) {
int underline = OS.TextDecorations_Underline();
OS.FormattedText_SetTextDecorations(text, underline, mnemonic, 1);
OS.GCHandle_Free(underline);
}
if ((flags & SWT.DRAW_TRANSPARENT) == 0) {
double width = OS.FormattedText_WidthIncludingTrailingWhitespace(text);
double height = OS.FormattedText_Height(text);
int rect = OS.gcnew_Rect(x, y, width, height);
OS.DrawingContext_DrawRectangle(handle, data.currentBrush, 0, rect);
OS.GCHandle_Free(rect);
}
OS.DrawingContext_DrawText(handle, text, point);
OS.GCHandle_Free(point);
OS.GCHandle_Free(culture);
OS.GCHandle_Free(str);
OS.GCHandle_Free(brush);
OS.GCHandle_Free(text);
}
/**
* Compares the argument to the receiver, and returns true
* if they represent the <em>same</em> object using a class
* specific comparison.
*
* @param object the object to compare with this object
* @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
*
* @see #hashCode
*/
public boolean equals (Object object) {
return (object == this) || ((object instanceof GC) && (handle == ((GC)object).handle));
}
/**
* Fills the interior of a circular or elliptical arc within
* the specified rectangular area, with the receiver's background
* color.
* <p>
* The resulting arc begins at <code>startAngle</code> and extends
* for <code>arcAngle</code> degrees, using the current color.
* Angles are interpreted such that 0 degrees is at the 3 o'clock
* position. A positive value indicates a counter-clockwise rotation
* while a negative value indicates a clockwise rotation.
* </p><p>
* The center of the arc is the center of the rectangle whose origin
* is (<code>x</code>, <code>y</code>) and whose size is specified by the
* <code>width</code> and <code>height</code> arguments.
* </p><p>
* The resulting arc covers an area <code>width + 1</code> pixels wide
* by <code>height + 1</code> pixels tall.
* </p>
*
* @param x the x coordinate of the upper-left corner of the arc to be filled
* @param y the y coordinate of the upper-left corner of the arc to be filled
* @param width the width of the arc to be filled
* @param height the height of the arc to be filled
* @param startAngle the beginning angle
* @param arcAngle the angular extent of the arc, relative to the start angle
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @see #drawArc
*/
public void fillArc (int x, int y, int width, int height, int startAngle, int arcAngle) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
checkGC(FILL);
if (width < 0) {
x = x + width;
width = -width;
}
if (height < 0) {
y = y + height;
height = -height;
}
if (width == 0 || height == 0 || arcAngle == 0) return;
if (arcAngle >= 360 || arcAngle <= -360) {
int center = OS.gcnew_Point(x + width / 2f, y + height / 2f);
OS.DrawingContext_DrawEllipse(handle, data.currentBrush, 0, center, width / 2f, height / 2f);
OS.GCHandle_Free(center);
return;
}
boolean isNegative = arcAngle < 0;
boolean isLargeAngle = arcAngle > 180 || arcAngle < -180;
arcAngle = arcAngle + startAngle;
if (isNegative) {
// swap angles
int tmp = startAngle;
startAngle = arcAngle;
arcAngle = tmp;
}
double x1 = Math.cos(startAngle * Math.PI / 180) * width/2.0 + x + width/2.0;
double y1 = -1 * Math.sin(startAngle * Math.PI / 180) * height/2.0 + y + height/2.0;
double x2 = Math.cos(arcAngle * Math.PI / 180) * width/2.0 + x + width/2.0;
double y2 = -1 * Math.sin(arcAngle * Math.PI / 180) * height/2.0 + y + height/2.0;
int startPoint = OS.gcnew_Point(x1, y1);
int endPoint = OS.gcnew_Point(x2, y2);
int center = OS.gcnew_Point(x + width / 2.0, y + height / 2.0);
int size = OS.gcnew_Size(width / 2.0, height / 2.0);
int arc = OS.gcnew_ArcSegment(endPoint, size, 0, isLargeAngle, OS.SweepDirection_Clockwise, false);
int line = OS.gcnew_LineSegment(center, false);
int figure = OS.gcnew_PathFigure();
OS.PathFigure_StartPoint(figure, startPoint);
int segments = OS.PathFigure_Segments(figure);
OS.PathSegmentCollection_Add(segments, arc);
OS.PathSegmentCollection_Add(segments, line);
int path = OS.gcnew_PathGeometry();
int figures = OS.PathGeometry_Figures(path);
OS.PathFigureCollection_Add(figures, figure);
OS.DrawingContext_DrawGeometry(handle, data.currentBrush, 0, path);
OS.GCHandle_Free(figures);
OS.GCHandle_Free(path);
OS.GCHandle_Free(segments);
OS.GCHandle_Free(figure);
OS.GCHandle_Free(arc);
OS.GCHandle_Free(line);
OS.GCHandle_Free(size);
OS.GCHandle_Free(endPoint);
OS.GCHandle_Free(startPoint);
}
/**
* Fills the interior of the specified rectangle with a gradient
* sweeping from left to right or top to bottom progressing
* from the receiver's foreground color to its background color.
*
* @param x the x coordinate of the rectangle to be filled
* @param y the y coordinate of the rectangle to be filled
* @param width the width of the rectangle to be filled, may be negative
* (inverts direction of gradient if horizontal)
* @param height the height of the rectangle to be filled, may be negative
* (inverts direction of gradient if vertical)
* @param vertical if true sweeps from top to bottom, else
* sweeps from left to right
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @see #drawRectangle(int, int, int, int)
*/
public void fillGradientRectangle(int x, int y, int width, int height, boolean vertical) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (width == 0 || height == 0) return;
checkGC(FILL);
int fromColor = data.foreground;
int toColor = data.background;
boolean swapColors = false;
if (width < 0) {
x += width; width = -width;
if (! vertical) swapColors = true;
}
if (height < 0) {
y += height; height = -height;
if (vertical) swapColors = true;
}
if (swapColors) {
int temp = fromColor;
fromColor = toColor;
toColor = temp;
}
int brush = OS.gcnew_LinearGradientBrush(fromColor, toColor, vertical ? 90 : 0);
int rect = OS.gcnew_Rect(x, y, width, height);
OS.DrawingContext_DrawRectangle(handle, brush, 0, rect);
OS.GCHandle_Free(rect);
OS.GCHandle_Free(brush);
}
/**
* Fills the interior of an oval, within the specified
* rectangular area, with the receiver's background
* color.
*
* @param x the x coordinate of the upper left corner of the oval to be filled
* @param y the y coordinate of the upper left corner of the oval to be filled
* @param width the width of the oval to be filled
* @param height the height of the oval to be filled
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @see #drawOval
*/
public void fillOval (int x, int y, int width, int height) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
checkGC(FILL);
if (width < 0) {
x = x + width;
width = -width;
}
if (height < 0) {
y = y + height;
height = -height;
}
int center = OS.gcnew_Point(x + width / 2f, y + height / 2f);
OS.DrawingContext_DrawEllipse(handle, data.currentBrush, 0, center, width / 2f, height / 2f);
OS.GCHandle_Free(center);
}
/**
* Fills the path described by the parameter.
* <p>
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
* </p>
*
* @param path the path to fill
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the parameter is null</li>
* <li>ERROR_INVALID_ARGUMENT - if the parameter has been disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
* </ul>
*
* @see Path
*
* @since 3.1
*/
public void fillPath (Path path) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (path == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (path.handle == 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
checkGC(FILL);
OS.PathGeometry_FillRule(path.handle, data.fillRule == SWT.FILL_EVEN_ODD ? OS.FillRule_EvenOdd : OS.FillRule_Nonzero);
OS.DrawingContext_DrawGeometry(handle, data.currentBrush, 0, path.handle);
}
/**
* Fills the interior of the closed polygon which is defined by the
* specified array of integer coordinates, using the receiver's
* background color. The array contains alternating x and y values
* which are considered to represent points which are the vertices of
* the polygon. Lines are drawn between each consecutive pair, and
* between the first pair and last pair in the array.
*
* @param pointArray an array of alternating x and y values which are the vertices of the polygon
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT if pointArray is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @see #drawPolygon
*/
public void fillPolygon(int[] pointArray) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (pointArray == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
checkGC(FILL);
drawPolyLineSegment(pointArray, true, false);
}
/**
* Fills the interior of the rectangle specified by the arguments,
* using the receiver's background color.
*
* @param x the x coordinate of the rectangle to be filled
* @param y the y coordinate of the rectangle to be filled
* @param width the width of the rectangle to be filled
* @param height the height of the rectangle to be filled
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @see #drawRectangle(int, int, int, int)
*/
public void fillRectangle (int x, int y, int width, int height) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
checkGC(FILL);
if (width < 0) {
x = x + width;
width = -width;
}
if (height < 0) {
y = y + height;
height = -height;
}
int rect = OS.gcnew_Rect(x, y, width, height);
OS.DrawingContext_DrawRectangle(handle, data.currentBrush, 0, rect);
OS.GCHandle_Free(rect);
}
/**
* Fills the interior of the specified rectangle, using the receiver's
* background color.
*
* @param rect the rectangle to be filled
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the rectangle is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @see #drawRectangle(int, int, int, int)
*/
public void fillRectangle (Rectangle rect) {
if (rect == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
fillRectangle (rect.x, rect.y, rect.width, rect.height);
}
/**
* Fills the interior of the round-cornered rectangle specified by
* the arguments, using the receiver's background color.
*
* @param x the x coordinate of the rectangle to be filled
* @param y the y coordinate of the rectangle to be filled
* @param width the width of the rectangle to be filled
* @param height the height of the rectangle to be filled
* @param arcWidth the width of the arc
* @param arcHeight the height of the arc
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @see #drawRoundRectangle
*/
public void fillRoundRectangle (int x, int y, int width, int height, int arcWidth, int arcHeight) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
checkGC(FILL);
if (width < 0) {
x = x + width;
width = -width;
}
if (height < 0) {
y = y + height;
height = -height;
}
if (arcWidth < 0) arcWidth = -arcWidth;
if (arcHeight < 0) arcHeight = -arcHeight;
int rect = OS.gcnew_Rect(x, y, width, height);
OS.DrawingContext_DrawRoundedRectangle(handle, data.currentBrush, 0, rect, arcWidth / 2f, arcHeight / 2f);
OS.GCHandle_Free(rect);
}
/**
* Returns the <em>advance width</em> of the specified character in
* the font which is currently selected into the receiver.
* <p>
* The advance width is defined as the horizontal distance the cursor
* should move after printing the character in the selected font.
* </p>
*
* @param ch the character to measure
* @return the distance in the x direction to move past the character before painting the next
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public int getAdvanceWidth(char ch) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
//NOT DONE
return stringExtent(new String(new char[]{ch})).x;
}
/**
* Returns <code>true</code> if receiver is using the operating system's
* advanced graphics subsystem. Otherwise, <code>false</code> is returned
* to indicate that normal graphics are in use.
* <p>
* Advanced graphics may not be installed for the operating system. In this
* case, <code>false</code> is always returned. Some operating system have
* only one graphics subsystem. If this subsystem supports advanced graphics,
* then <code>true</code> is always returned. If any graphics operation such
* as alpha, antialias, patterns, interpolation, paths, clipping or transformation
* has caused the receiver to switch from regular to advanced graphics mode,
* <code>true</code> is returned. If the receiver has been explicitly switched
* to advanced mode and this mode is supported, <code>true</code> is returned.
* </p>
*
* @return the advanced value
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @see #setAdvanced
*
* @since 3.1
*/
public boolean getAdvanced() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return true;
}
/**
* Returns the receiver's alpha value. The alpha value
* is between 0 (transparent) and 255 (opaque).
*
* @return the alpha value
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @since 3.1
*/
public int getAlpha() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.alpha;
}
/**
* Returns the receiver's anti-aliasing setting value, which will be
* one of <code>SWT.DEFAULT</code>, <code>SWT.OFF</code> or
* <code>SWT.ON</code>. Note that this controls anti-aliasing for all
* <em>non-text drawing</em> operations.
*
* @return the anti-aliasing setting
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @see #getTextAntialias
*
* @since 3.1
*/
public int getAntialias() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.antialias;
}
/**
* Returns the background color.
*
* @return the receiver's background color
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public Color getBackground() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return Color.wpf_new(data.device, data.background);
}
/**
* Returns the background pattern. The default value is
* <code>null</code>.
*
* @return the receiver's background pattern
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @see Pattern
*
* @since 3.1
*/
public Pattern getBackgroundPattern() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.backgroundPattern;
}
/**
* Returns the width of the specified character in the font
* selected into the receiver.
* <p>
* The width is defined as the space taken up by the actual
* character, not including the leading and tailing whitespace
* or overhang.
* </p>
*
* @param ch the character to measure
* @return the width of the character
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public int getCharWidth(char ch) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
//NOT DONE
return stringExtent(new String(new char[]{ch})).x;
}
/**
* Returns the bounding rectangle of the receiver's clipping
* region. If no clipping region is set, the return value
* will be a rectangle which covers the entire bounds of the
* object the receiver is drawing on.
*
* @return the bounding rectangle of the clipping region
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public Rectangle getClipping() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
int x = 0, y = 0, width = 0, height = 0;
int visualType = OS.Object_GetType(data.visual);
int drawingVisualType = OS.DrawingVisual_typeid();
if (OS.Object_Equals(visualType, drawingVisualType)) {
int clip = OS.ContainerVisual_Clip(data.visual);
int rect = OS.Geometry_Bounds(clip);
width = (int)OS.Rect_Width(rect);
height = (int)OS.Rect_Height(rect);
OS.GCHandle_Free(rect);
OS.GCHandle_Free(clip);
} else {
width = (int)OS.FrameworkElement_ActualWidth(data.visual);
height = (int)OS.FrameworkElement_ActualHeight(data.visual);
}
OS.GCHandle_Free(drawingVisualType);
OS.GCHandle_Free(visualType);
if (data.clip != 0) {
int bounds = OS.gcnew_Rect(x, y, width, height);
int rect = OS.Geometry_Bounds(data.clip);
OS.Rect_Intersect(bounds, rect);
x = (int)OS.Rect_X(bounds);
y = (int)OS.Rect_Y(bounds);
width = (int)OS.Rect_Width(bounds);
height = (int)OS.Rect_Height(bounds);
OS.GCHandle_Free(rect);
OS.GCHandle_Free(bounds);
}
return new Rectangle(x, y, width, height);
}
/**
* Sets the region managed by the argument to the current
* clipping region of the receiver.
*
* @param region the region to fill with the clipping region
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the region is null</li>
* <li>ERROR_INVALID_ARGUMENT - if the region is disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void getClipping (Region region) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (region == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
if (region.isDisposed()) SWT.error (SWT.ERROR_INVALID_ARGUMENT);
int bounds;
int visualType = OS.Object_GetType(data.visual);
int drawingVisualType = OS.DrawingVisual_typeid();
if (OS.Object_Equals(visualType, drawingVisualType)) {
bounds = OS.ContainerVisual_Clip(data.visual);
} else {
double width = OS.FrameworkElement_ActualWidth(data.visual);
double height = OS.FrameworkElement_ActualHeight(data.visual);
int rect = OS.gcnew_Rect(0, 0, width, height);
bounds = OS.gcnew_RectangleGeometry(rect);
OS.GCHandle_Free(rect);
}
OS.GCHandle_Free(drawingVisualType);
OS.GCHandle_Free(visualType);
int geometries = OS.GeometryGroup_Children(region.handle);
OS.GeometryCollection_Clear(geometries);
if (data.clip != 0) {
int clip = OS.Geometry_GetFlattenedPathGeometry(data.clip);
int newGeometry = OS.gcnew_CombinedGeometry(OS.GeometryCombineMode_Intersect, bounds, clip);
OS.GeometryCollection_Add(geometries, newGeometry);
OS.GCHandle_Free(clip);
OS.GCHandle_Free(newGeometry);
} else {
OS.GeometryCollection_Add(geometries, bounds);
}
OS.GCHandle_Free(bounds);
OS.GCHandle_Free(geometries);
}
/**
* Returns the receiver's fill rule, which will be one of
* <code>SWT.FILL_EVEN_ODD</code> or <code>SWT.FILL_WINDING</code>.
*
* @return the receiver's fill rule
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @since 3.1
*/
public int getFillRule() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.fillRule;
}
/**
* Returns the font currently being used by the receiver
* to draw and measure text.
*
* @return the receiver's font
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public Font getFont () {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.font;
}
/**
* Returns a FontMetrics which contains information
* about the font currently being used by the receiver
* to draw and measure text.
*
* @return font metrics for the receiver's font
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public FontMetrics getFontMetrics() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
checkGC(FONT);
//TODO - find a better way of getting font metrics
String string = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
int length = string.length();
char [] buffer = new char [length + 1];
string.getChars (0, length, buffer, 0);
int str = OS.gcnew_String (buffer);
int culture = OS.CultureInfo_CurrentUICulture();
Font font = data.font;
int direction = (data.style & SWT.RIGHT_TO_LEFT) != 0 ? OS.FlowDirection_RightToLeft : OS.FlowDirection_LeftToRight;
int brush = OS.Brushes_White();
int text = OS.gcnew_FormattedText(str, culture, direction, font.handle, font.size, brush);
double width = OS.FormattedText_WidthIncludingTrailingWhitespace(text);
double height = OS.FormattedText_Height(text);
double baseline = OS.FormattedText_Baseline(text);
OS.GCHandle_Free(text);
OS.GCHandle_Free(brush);
OS.GCHandle_Free(culture);
OS.GCHandle_Free(str);
return FontMetrics.wpf_new((int)baseline, (int)(height - baseline), (int)width / string.length(), 0, (int)height);
}
/**
* Returns the receiver's foreground color.
*
* @return the color used for drawing foreground things
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public Color getForeground() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return Color.wpf_new(data.device, data.foreground);
}
/**
* Returns the foreground pattern. The default value is
* <code>null</code>.
*
* @return the receiver's foreground pattern
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @see Pattern
*
* @since 3.1
*/
public Pattern getForegroundPattern() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.foregroundPattern;
}
/**
* Returns the GCData.
* <p>
* <b>IMPORTANT:</b> This method is <em>not</em> part of the public
* API for <code>GC</code>. It is marked public only so that it
* can be shared within the packages provided by SWT. It is not
* available on all platforms, and should never be called from
* application code.
* </p>
*
* @return the receiver's GCData
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @see GCData
*
* @noreference This method is not intended to be referenced by clients.
*
* @since 3.2
*/
public GCData getGCData() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data;
}
/**
* Returns the receiver's interpolation setting, which will be one of
* <code>SWT.DEFAULT</code>, <code>SWT.NONE</code>,
* <code>SWT.LOW</code> or <code>SWT.HIGH</code>.
*
* @return the receiver's interpolation setting
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @since 3.1
*/
public int getInterpolation() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.interpolation;
}
/**
* Returns the receiver's line attributes.
*
* @return the line attributes used for drawing lines
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @since 3.3
*/
public LineAttributes getLineAttributes() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
float[] dashes = null;
if (data.lineDashes != null) {
dashes = new float[data.lineDashes.length];
System.arraycopy(data.lineDashes, 0, dashes, 0, dashes.length);
}
return new LineAttributes(data.lineWidth, data.lineCap, data.lineJoin, data.lineStyle, dashes, data.lineDashesOffset, data.lineMiterLimit);
}
/**
* Returns the receiver's line cap style, which will be one
* of the constants <code>SWT.CAP_FLAT</code>, <code>SWT.CAP_ROUND</code>,
* or <code>SWT.CAP_SQUARE</code>.
*
* @return the cap style used for drawing lines
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @since 3.1
*/
public int getLineCap() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.lineCap;
}
/**
* Returns the receiver's line dash style. The default value is
* <code>null</code>.
*
* @return the line dash style used for drawing lines
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @since 3.1
*/
public int[] getLineDash() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (data.lineDashes == null) return null;
int[] lineDashes = new int[data.lineDashes.length];
System.arraycopy(data.lineDashes, 0, lineDashes, 0, lineDashes.length);
return lineDashes;
}
/**
* Returns the receiver's line join style, which will be one
* of the constants <code>SWT.JOIN_MITER</code>, <code>SWT.JOIN_ROUND</code>,
* or <code>SWT.JOIN_BEVEL</code>.
*
* @return the join style used for drawing lines
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @since 3.1
*/
public int getLineJoin() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.lineJoin;
}
/**
* Returns the receiver's line style, which will be one
* of the constants <code>SWT.LINE_SOLID</code>, <code>SWT.LINE_DASH</code>,
* <code>SWT.LINE_DOT</code>, <code>SWT.LINE_DASHDOT</code> or
* <code>SWT.LINE_DASHDOTDOT</code>.
*
* @return the style used for drawing lines
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public int getLineStyle() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.lineStyle;
}
/**
* Returns the width that will be used when drawing lines
* for all of the figure drawing operations (that is,
* <code>drawLine</code>, <code>drawRectangle</code>,
* <code>drawPolyline</code>, and so forth.
*
* @return the receiver's line width
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public int getLineWidth() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return (int)data.lineWidth;
}
/**
* Returns the receiver's style information.
* <p>
* Note that the value which is returned by this method <em>may
* not match</em> the value which was provided to the constructor
* when the receiver was created. This can occur when the underlying
* operating system does not support a particular combination of
* requested styles.
* </p>
*
* @return the style bits
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @since 2.1.2
*/
public int getStyle () {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.style;
}
/**
* Returns the receiver's text drawing anti-aliasing setting value,
* which will be one of <code>SWT.DEFAULT</code>, <code>SWT.OFF</code> or
* <code>SWT.ON</code>. Note that this controls anti-aliasing
* <em>only</em> for text drawing operations.
*
* @return the anti-aliasing setting
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @see #getAntialias
*
* @since 3.1
*/
public int getTextAntialias() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.textAntialias;
}
/**
* Sets the parameter to the transform that is currently being
* used by the receiver.
*
* @param transform the destination to copy the transform into
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the parameter is null</li>
* <li>ERROR_INVALID_ARGUMENT - if the parameter has been disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @see Transform
*
* @since 3.1
*/
public void getTransform(Transform transform) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (transform == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (transform.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
if (data.transform != 0) {
OS.MatrixTransform_Matrix(transform.handle, data.transform);
} else {
transform.setElements(1, 0, 0, 1, 0, 0);
}
}
/**
* Returns <code>true</code> if this GC is drawing in the mode
* where the resulting color in the destination is the
* <em>exclusive or</em> of the color values in the source
* and the destination, and <code>false</code> if it is
* drawing in the mode where the destination color is being
* replaced with the source color value.
*
* @return <code>true</code> true if the receiver is in XOR mode, and false otherwise
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public boolean getXORMode() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.xorMode;
}
void init(Drawable drawable, GCData data, int hDC) {
int foreground = data.foreground;
if (foreground != -1) data.state &= ~FOREGROUND;
int background = data.background;
if (background != 0) data.state &= ~BACKGROUND;
Font font = data.font;
if (font != null) data.state &= ~FONT;
Image image = data.image;
if (image != null) image.memGC = this;
// int layout = data.layout;
// if (layout != -1) {
// if (!OS.IsWinCE && OS.WIN32_VERSION >= OS.VERSION(4, 10)) {
// int flags = OS.GetLayout(hDC);
// if ((flags & OS.LAYOUT_RTL) != (layout & OS.LAYOUT_RTL)) {
// flags &= ~OS.LAYOUT_RTL;
// OS.SetLayout(hDC, flags | layout);
// }
// if ((data.style & SWT.RIGHT_TO_LEFT) != 0) data.style |= SWT.MIRRORED;
// }
// }
this.drawable = drawable;
this.data = data;
handle = hDC;
}
/**
* Returns an integer hash code for the receiver. Any two
* objects that return <code>true</code> when passed to
* <code>equals</code> must return the same value for this
* method.
*
* @return the receiver's hash
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @see #equals
*/
public int hashCode () {
return handle;
}
/**
* Returns <code>true</code> if the receiver has a clipping
* region set into it, and <code>false</code> otherwise.
* If this method returns false, the receiver will draw on all
* available space in the destination. If it returns true,
* it will draw only in the area that is covered by the region
* that can be accessed with <code>getClipping(region)</code>.
*
* @return <code>true</code> if the GC has a clipping region, and <code>false</code> otherwise
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public boolean isClipped() {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return data.clip != 0;
}
/**
* Returns <code>true</code> if the GC has been disposed,
* and <code>false</code> otherwise.
* <p>
* This method gets the dispose state for the GC.
* When a GC has been disposed, it is an error to
* invoke any other method (except {@link #dispose()}) using the GC.
*
* @return <code>true</code> when the GC is disposed and <code>false</code> otherwise
*/
public boolean isDisposed() {
return handle == 0;
}
/**
* Sets the receiver to always use the operating system's advanced graphics
* subsystem for all graphics operations if the argument is <code>true</code>.
* If the argument is <code>false</code>, the advanced graphics subsystem is
* no longer used, advanced graphics state is cleared and the normal graphics
* subsystem is used from now on.
* <p>
* Normally, the advanced graphics subsystem is invoked automatically when
* any one of the alpha, antialias, patterns, interpolation, paths, clipping
* or transformation operations in the receiver is requested. When the receiver
* is switched into advanced mode, the advanced graphics subsystem performs both
* advanced and normal graphics operations. Because the two subsystems are
* different, their output may differ. Switching to advanced graphics before
* any graphics operations are performed ensures that the output is consistent.
* </p><p>
* Advanced graphics may not be installed for the operating system. In this
* case, this operation does nothing. Some operating system have only one
* graphics subsystem, so switching from normal to advanced graphics does
* nothing. However, switching from advanced to normal graphics will always
* clear the advanced graphics state, even for operating systems that have
* only one graphics subsystem.
* </p>
*
* @param advanced the new advanced graphics state
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @see #setAlpha
* @see #setAntialias
* @see #setBackgroundPattern
* @see #setClipping(Path)
* @see #setForegroundPattern
* @see #setLineAttributes
* @see #setInterpolation
* @see #setTextAntialias
* @see #setTransform
* @see #getAdvanced
*
* @since 3.1
*/
public void setAdvanced(boolean advanced) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (!advanced) {
setAlpha(0xFF);
setAntialias(SWT.DEFAULT);
setBackgroundPattern(null);
setClipping((Rectangle)null);
setForegroundPattern(null);
setInterpolation(SWT.DEFAULT);
setTextAntialias(SWT.DEFAULT);
setTransform(null);
}
}
/**
* Sets the receiver's anti-aliasing value to the parameter,
* which must be one of <code>SWT.DEFAULT</code>, <code>SWT.OFF</code>
* or <code>SWT.ON</code>. Note that this controls anti-aliasing for all
* <em>non-text drawing</em> operations.
* <p>
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
* </p>
*
* @param antialias the anti-aliasing setting
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_ARGUMENT - if the parameter is not one of <code>SWT.DEFAULT</code>,
* <code>SWT.OFF</code> or <code>SWT.ON</code></li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
* </ul>
*
* @see #getAdvanced
* @see #setAdvanced
* @see #setTextAntialias
*
* @since 3.1
*/
public void setAntialias(int antialias) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
switch (antialias) {
case SWT.DEFAULT:
case SWT.OFF:
case SWT.ON:
break;
default:
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
data.antialias = antialias;
}
/**
* Sets the receiver's alpha value which must be
* between 0 (transparent) and 255 (opaque).
* <p>
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
* </p>
* @param alpha the alpha value
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
* </ul>
*
* @see #getAdvanced
* @see #setAdvanced
*
* @since 3.1
*/
public void setAlpha(int alpha) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
data.alpha = alpha & 0xFF;
data.state &= ~ALPHA;
}
/**
* Sets the background color. The background color is used
* for fill operations and as the background color when text
* is drawn.
*
* @param color the new background color for the receiver
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the color is null</li>
* <li>ERROR_INVALID_ARGUMENT - if the color has been disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void setBackground (Color color) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (color == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (color.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
if (data.backgroundPattern == null && data.background == color.handle) return;
data.backgroundPattern = null;
data.background = color.handle;
data.state &= ~BACKGROUND;
}
/**
* Sets the background pattern. The default value is <code>null</code>.
* <p>
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
* </p>
*
* @param pattern the new background pattern
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_ARGUMENT - if the parameter has been disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
* </ul>
*
* @see Pattern
* @see #getAdvanced
* @see #setAdvanced
*
* @since 3.1
*/
public void setBackgroundPattern (Pattern pattern) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (pattern != null && pattern.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
if (data.backgroundPattern == pattern) return;
data.backgroundPattern = pattern;
data.state &= ~BACKGROUND;
}
/**
* Sets the area of the receiver which can be changed
* by drawing operations to the rectangular area specified
* by the arguments.
*
* @param x the x coordinate of the clipping rectangle
* @param y the y coordinate of the clipping rectangle
* @param width the width of the clipping rectangle
* @param height the height of the clipping rectangle
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void setClipping (int x, int y, int width, int height) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (width < 0) {
x = x + width;
width = -width;
}
if (height < 0) {
y = y + height;
height = -height;
}
int rect = OS.gcnew_Rect(x, y, width, height);
int clip = OS.gcnew_RectangleGeometry(rect);
OS.GCHandle_Free(rect);
if (data.clip != 0) OS.GCHandle_Free(data.clip);
data.clip = clip;
data.state &= ~CLIPPING;
}
/**
* Sets the area of the receiver which can be changed
* by drawing operations to the path specified
* by the argument.
* <p>
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
* </p>
*
* @param path the clipping path.
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_ARGUMENT - if the path has been disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
* </ul>
*
* @see Path
* @see #getAdvanced
* @see #setAdvanced
*
* @since 3.1
*/
public void setClipping (Path path) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (path != null && path.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
if (data.clip != 0) OS.GCHandle_Free(data.clip);
data.clip = path != null ? OS.Geometry_Clone(path.handle) : 0;
data.state &= ~CLIPPING;
}
/**
* Sets the area of the receiver which can be changed
* by drawing operations to the rectangular area specified
* by the argument. Specifying <code>null</code> for the
* rectangle reverts the receiver's clipping area to its
* original value.
*
* @param rect the clipping rectangle or <code>null</code>
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void setClipping (Rectangle rect) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (rect == null) {
if (data.clip != 0) OS.GCHandle_Free(data.clip);
data.clip = 0;
data.state &= ~CLIPPING;
} else {
setClipping(rect.x, rect.y, rect.width, rect.height);
}
}
/**
* Sets the area of the receiver which can be changed
* by drawing operations to the region specified
* by the argument. Specifying <code>null</code> for the
* region reverts the receiver's clipping area to its
* original value.
*
* @param region the clipping region or <code>null</code>
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_ARGUMENT - if the region has been disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void setClipping (Region region) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (region != null && region.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
if (data.clip != 0) OS.GCHandle_Free(data.clip);
data.clip = region != null ? OS.Geometry_Clone(region.handle) : 0;
data.state &= ~CLIPPING;
}
/**
* Sets the receiver's fill rule to the parameter, which must be one of
* <code>SWT.FILL_EVEN_ODD</code> or <code>SWT.FILL_WINDING</code>.
*
* @param rule the new fill rule
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_ARGUMENT - if the rule is not one of <code>SWT.FILL_EVEN_ODD</code>
* or <code>SWT.FILL_WINDING</code></li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @since 3.1
*/
public void setFillRule(int rule) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
switch (rule) {
case SWT.FILL_WINDING:
case SWT.FILL_EVEN_ODD: break;
default:
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
data.fillRule = rule;
}
/**
* Sets the font which will be used by the receiver
* to draw and measure text to the argument. If the
* argument is null, then a default font appropriate
* for the platform will be used instead.
*
* @param font the new font for the receiver, or null to indicate a default font
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_ARGUMENT - if the font has been disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void setFont (Font font) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (font != null && font.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
data.font = font != null ? font : data.device.systemFont;
data.state &= ~FONT;
}
/**
* Sets the foreground color. The foreground color is used
* for drawing operations including when text is drawn.
*
* @param color the new foreground color for the receiver
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the color is null</li>
* <li>ERROR_INVALID_ARGUMENT - if the color has been disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void setForeground (Color color) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (color == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (color.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
if (data.foregroundPattern == null && color.handle == data.foreground) return;
data.foregroundPattern = null;
data.foreground = color.handle;
data.state &= ~FOREGROUND;
}
/**
* Sets the foreground pattern. The default value is <code>null</code>.
* <p>
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
* </p>
* @param pattern the new foreground pattern
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_ARGUMENT - if the parameter has been disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
* </ul>
*
* @see Pattern
* @see #getAdvanced
* @see #setAdvanced
*
* @since 3.1
*/
public void setForegroundPattern (Pattern pattern) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (pattern != null && pattern.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
if (data.foregroundPattern == pattern) return;
data.foregroundPattern = pattern;
data.state &= ~FOREGROUND;
}
/**
* Sets the receiver's interpolation setting to the parameter, which
* must be one of <code>SWT.DEFAULT</code>, <code>SWT.NONE</code>,
* <code>SWT.LOW</code> or <code>SWT.HIGH</code>.
* <p>
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
* </p>
*
* @param interpolation the new interpolation setting
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_ARGUMENT - if the rule is not one of <code>SWT.DEFAULT</code>,
* <code>SWT.NONE</code>, <code>SWT.LOW</code> or <code>SWT.HIGH</code>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
* </ul>
*
* @see #getAdvanced
* @see #setAdvanced
*
* @since 3.1
*/
public void setInterpolation(int interpolation) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
switch (interpolation) {
case SWT.DEFAULT: break;
case SWT.NONE: break;
case SWT.LOW: break;
case SWT.HIGH: break;
default:
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
data.interpolation = interpolation;
}
/**
* Sets the receiver's line attributes.
* <p>
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
* </p>
* @param attributes the line attributes
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the attributes is null</li>
* <li>ERROR_INVALID_ARGUMENT - if any of the line attributes is not valid</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
* </ul>
*
* @see LineAttributes
* @see #getAdvanced
* @see #setAdvanced
*
* @since 3.3
*/
public void setLineAttributes(LineAttributes attributes) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (attributes == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
int mask = 0;
float lineWidth = attributes.width;
if (lineWidth != data.lineWidth) {
mask |= LINE_WIDTH;
}
int lineStyle = attributes.style;
if (lineStyle != data.lineStyle) {
mask |= LINE_STYLE;
switch (lineStyle) {
case SWT.LINE_SOLID:
case SWT.LINE_DASH:
case SWT.LINE_DOT:
case SWT.LINE_DASHDOT:
case SWT.LINE_DASHDOTDOT:
break;
case SWT.LINE_CUSTOM:
if (attributes.dash == null) lineStyle = SWT.LINE_SOLID;
break;
default:
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
}
int join = attributes.join;
if (join != data.lineJoin) {
mask |= LINE_JOIN;
switch (join) {
case SWT.JOIN_MITER:
case SWT.JOIN_ROUND:
case SWT.JOIN_BEVEL:
break;
default:
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
}
int cap = attributes.cap;
if (cap != data.lineCap) {
mask |= LINE_CAP;
switch (cap) {
case SWT.CAP_FLAT:
case SWT.CAP_ROUND:
case SWT.CAP_SQUARE:
break;
default:
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
}
float[] dashes = attributes.dash;
float[] lineDashes = data.lineDashes;
if (dashes != null && dashes.length > 0) {
boolean changed = lineDashes == null || lineDashes.length != dashes.length;
for (int i = 0; i < dashes.length; i++) {
float dash = dashes[i];
if (dash <= 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
if (!changed && lineDashes[i] != dash) changed = true;
}
if (changed) {
float[] newDashes = new float[dashes.length];
System.arraycopy(dashes, 0, newDashes, 0, dashes.length);
dashes = newDashes;
mask |= LINE_STYLE;
} else {
dashes = lineDashes;
}
} else {
if (lineDashes != null && lineDashes.length > 0) {
mask |= LINE_STYLE;
} else {
dashes = lineDashes;
}
}
float dashOffset = attributes.dashOffset;
if (dashOffset != data.lineDashesOffset) {
mask |= LINE_STYLE;
}
float miterLimit = attributes.miterLimit;
if (miterLimit != data.lineMiterLimit) {
mask |= LINE_MITERLIMIT;
}
if (mask == 0) return;
data.lineWidth = lineWidth;
data.lineStyle = lineStyle;
data.lineCap = cap;
data.lineJoin = join;
data.lineDashes = dashes;
data.lineDashesOffset = dashOffset;
data.lineMiterLimit = miterLimit;
data.state &= ~mask;
}
/**
* Sets the receiver's line cap style to the argument, which must be one
* of the constants <code>SWT.CAP_FLAT</code>, <code>SWT.CAP_ROUND</code>,
* or <code>SWT.CAP_SQUARE</code>.
*
* @param cap the cap style to be used for drawing lines
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_ARGUMENT - if the style is not valid</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @since 3.1
*/
public void setLineCap(int cap) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (data.lineCap == cap) return;
switch (cap) {
case SWT.CAP_ROUND:
case SWT.CAP_FLAT:
case SWT.CAP_SQUARE:
break;
default:
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
data.lineCap = cap;
data.state &= ~LINE_CAP;
}
/**
* Sets the receiver's line dash style to the argument. The default
* value is <code>null</code>. If the argument is not <code>null</code>,
* the receiver's line style is set to <code>SWT.LINE_CUSTOM</code>, otherwise
* it is set to <code>SWT.LINE_SOLID</code>.
*
* @param dashes the dash style to be used for drawing lines
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_ARGUMENT - if any of the values in the array is less than or equal 0</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @since 3.1
*/
public void setLineDash(int[] dashes) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
float[] lineDashes = data.lineDashes;
if (dashes != null && dashes.length > 0) {
boolean changed = data.lineStyle != SWT.LINE_CUSTOM || lineDashes == null || lineDashes.length != dashes.length;
for (int i = 0; i < dashes.length; i++) {
int dash = dashes[i];
if (dash <= 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
if (!changed && lineDashes[i] != dash) changed = true;
}
if (!changed) return;
data.lineDashes = new float[dashes.length];
for (int i = 0; i < dashes.length; i++) {
data.lineDashes[i] = dashes[i];
}
data.lineStyle = SWT.LINE_CUSTOM;
} else {
if (data.lineStyle == SWT.LINE_SOLID && (lineDashes == null || lineDashes.length == 0)) return;
data.lineDashes = null;
data.lineStyle = SWT.LINE_SOLID;
}
data.state &= ~LINE_STYLE;
}
/**
* Sets the receiver's line join style to the argument, which must be one
* of the constants <code>SWT.JOIN_MITER</code>, <code>SWT.JOIN_ROUND</code>,
* or <code>SWT.JOIN_BEVEL</code>.
*
* @param join the join style to be used for drawing lines
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_ARGUMENT - if the style is not valid</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @since 3.1
*/
public void setLineJoin(int join) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (data.lineJoin == join) return;
switch (join) {
case SWT.JOIN_MITER:
case SWT.JOIN_ROUND:
case SWT.JOIN_BEVEL:
break;
default:
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
data.lineJoin = join;
data.state &= ~LINE_JOIN;
}
/**
* Sets the receiver's line style to the argument, which must be one
* of the constants <code>SWT.LINE_SOLID</code>, <code>SWT.LINE_DASH</code>,
* <code>SWT.LINE_DOT</code>, <code>SWT.LINE_DASHDOT</code> or
* <code>SWT.LINE_DASHDOTDOT</code>.
*
* @param lineStyle the style to be used for drawing lines
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_ARGUMENT - if the style is not valid</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void setLineStyle(int lineStyle) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (data.lineStyle == lineStyle) return;
switch (lineStyle) {
case SWT.LINE_SOLID:
case SWT.LINE_DASH:
case SWT.LINE_DOT:
case SWT.LINE_DASHDOT:
case SWT.LINE_DASHDOTDOT:
break;
case SWT.LINE_CUSTOM:
if (data.lineDashes == null) lineStyle = SWT.LINE_SOLID;
break;
default:
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
data.lineStyle = lineStyle;
data.state &= ~LINE_STYLE;
}
/**
* Sets the width that will be used when drawing lines
* for all of the figure drawing operations (that is,
* <code>drawLine</code>, <code>drawRectangle</code>,
* <code>drawPolyline</code>, and so forth.
* <p>
* Note that line width of zero is used as a hint to
* indicate that the fastest possible line drawing
* algorithms should be used. This means that the
* output may be different from line width one.
* </p>
*
* @param lineWidth the width of a line
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void setLineWidth(int lineWidth) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (data.lineWidth == lineWidth) return;
data.lineWidth = lineWidth;
data.state &= ~LINE_WIDTH;
switch (data.lineStyle) {
case SWT.LINE_DOT:
case SWT.LINE_DASH:
case SWT.LINE_DASHDOT:
case SWT.LINE_DASHDOTDOT:
data.state &= ~LINE_STYLE;
}
}
/**
* If the argument is <code>true</code>, puts the receiver
* in a drawing mode where the resulting color in the destination
* is the <em>exclusive or</em> of the color values in the source
* and the destination, and if the argument is <code>false</code>,
* puts the receiver in a drawing mode where the destination color
* is replaced with the source color value.
* <p>
* Note that this mode in fundamentally unsupportable on certain
* platforms, notably Carbon (Mac OS X). Clients that want their
* code to run on all platforms need to avoid this method.
* </p>
*
* @param xor if <code>true</code>, then <em>xor</em> mode is used, otherwise <em>source copy</em> mode is used
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @deprecated this functionality is not supported on some platforms
*/
public void setXORMode(boolean xor) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
data.xorMode = xor;
}
/**
* Sets the receiver's text anti-aliasing value to the parameter,
* which must be one of <code>SWT.DEFAULT</code>, <code>SWT.OFF</code>
* or <code>SWT.ON</code>. Note that this controls anti-aliasing only
* for all <em>text drawing</em> operations.
* <p>
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
* </p>
*
* @param antialias the anti-aliasing setting
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_ARGUMENT - if the parameter is not one of <code>SWT.DEFAULT</code>,
* <code>SWT.OFF</code> or <code>SWT.ON</code></li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
* </ul>
*
* @see #getAdvanced
* @see #setAdvanced
* @see #setAntialias
*
* @since 3.1
*/
public void setTextAntialias(int antialias) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
switch (antialias) {
case SWT.DEFAULT:
case SWT.OFF:
case SWT.ON:
break;
default:
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
data.textAntialias = antialias;
}
/**
* Sets the transform that is currently being used by the receiver. If
* the argument is <code>null</code>, the current transform is set to
* the identity transform.
* <p>
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
* </p>
*
* @param transform the transform to set
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_ARGUMENT - if the parameter has been disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
* </ul>
*
* @see Transform
* @see #getAdvanced
* @see #setAdvanced
*
* @since 3.1
*/
public void setTransform(Transform transform) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (transform != null && transform.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
data.transform = transform != null ? OS.gcnew_MatrixTransform(transform.handle) : 0;
data.state &= ~TRANSFORM;
}
/**
* Returns the extent of the given string. No tab
* expansion or carriage return processing will be performed.
* <p>
* The <em>extent</em> of a string is the width and height of
* the rectangular area it would cover if drawn in a particular
* font (in this case, the current font in the receiver).
* </p>
*
* @param string the string to measure
* @return a point containing the extent of the string
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the string is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public Point stringExtent(String string) {
return textExtent(string, 0);
}
/**
* Returns the extent of the given string. Tab expansion and
* carriage return processing are performed.
* <p>
* The <em>extent</em> of a string is the width and height of
* the rectangular area it would cover if drawn in a particular
* font (in this case, the current font in the receiver).
* </p>
*
* @param string the string to measure
* @return a point containing the extent of the string
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the string is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public Point textExtent(String string) {
return textExtent(string, SWT.DRAW_DELIMITER | SWT.DRAW_TAB);
}
/**
* Returns the extent of the given string. Tab expansion, line
* delimiter and mnemonic processing are performed according to
* the specified flags, which can be a combination of:
* <dl>
* <dt><b>DRAW_DELIMITER</b></dt>
* <dd>draw multiple lines</dd>
* <dt><b>DRAW_TAB</b></dt>
* <dd>expand tabs</dd>
* <dt><b>DRAW_MNEMONIC</b></dt>
* <dd>underline the mnemonic character</dd>
* <dt><b>DRAW_TRANSPARENT</b></dt>
* <dd>transparent background</dd>
* </dl>
* <p>
* The <em>extent</em> of a string is the width and height of
* the rectangular area it would cover if drawn in a particular
* font (in this case, the current font in the receiver).
* </p>
*
* @param string the string to measure
* @param flags the flags specifying how to process the text
* @return a point containing the extent of the string
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the string is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public Point textExtent(String string, int flags) {
if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (string == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
checkGC(FONT);
int length = string.length();
char [] buffer = new char [length + 1];
string.getChars (0, length, buffer, 0);
if ((flags & (SWT.DRAW_DELIMITER | SWT.DRAW_TAB)) != (SWT.DRAW_DELIMITER | SWT.DRAW_TAB)) {
for (int i = 0, j = 0; i < buffer.length; i++) {
char c = buffer[i];
switch (c) {
case '\r':
case '\n':
if ((flags & SWT.DRAW_DELIMITER) == 0) continue;
break;
case '\t':
if ((flags & SWT.DRAW_TAB) == 0) continue;
break;
}
buffer[j++] = c;
}
}
int str = OS.gcnew_String (buffer);
int culture = OS.CultureInfo_CurrentUICulture();
Font font = data.font;
int direction = (data.style & SWT.RIGHT_TO_LEFT) != 0 ? OS.FlowDirection_RightToLeft : OS.FlowDirection_LeftToRight;
int brush = OS.Brushes_White();
int text = OS.gcnew_FormattedText(str, culture, direction, font.handle, font.size, brush);
double width = OS.FormattedText_WidthIncludingTrailingWhitespace(text);
double height = OS.FormattedText_Height(text);
OS.GCHandle_Free(text);
OS.GCHandle_Free(brush);
OS.GCHandle_Free(culture);
OS.GCHandle_Free(str);
return new Point((int)width, (int)height);
}
/**
* Returns a string containing a concise, human-readable
* description of the receiver.
*
* @return a string representation of the receiver
*/
public String toString () {
if (isDisposed()) return "GC {*DISPOSED*}";
return "GC {" + handle + "}";
}
/**
* Invokes platform specific functionality to allocate a new graphics context.
* <p>
* <b>IMPORTANT:</b> This method is <em>not</em> part of the public
* API for <code>GC</code>. It is marked public only so that it
* can be shared within the packages provided by SWT. It is not
* available on all platforms, and should never be called from
* application code.
* </p>
*
* @param drawable the Drawable for the receiver.
* @param data the data for the receiver.
*
* @return a new <code>GC</code>
*
* @noreference This method is not intended to be referenced by clients.
*/
public static GC wpf_new(Drawable drawable, GCData data) {
GC gc = new GC();
int hDC = drawable.internal_new_GC(data);
gc.device = data.device;
gc.init(drawable, data, hDC);
return gc;
}
/**
* Invokes platform specific functionality to wrap a graphics context.
* <p>
* <b>IMPORTANT:</b> This method is <em>not</em> part of the public
* API for <code>GC</code>. It is marked public only so that it
* can be shared within the packages provided by SWT. It is not
* available on all platforms, and should never be called from
* application code.
* </p>
*
* @param hDC the Windows HDC.
* @param data the data for the receiver.
*
* @return a new <code>GC</code>
*
* @noreference This method is not intended to be referenced by clients.
*/
public static GC wpf_new(int hDC, GCData data) {
GC gc = new GC();
gc.device = data.device;
gc.init(null, data, hDC);
return gc;
}
}