/*******************************************************************************
* Copyright (c) 2000, 2008 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.*;
import org.eclipse.swt.internal.wpf.*;
/**
* Instances of this class represent paths through the two-dimensional
* coordinate system. Paths do not have to be continuous, and can be
* described using lines, rectangles, arcs, cubic or quadratic bezier curves,
* glyphs, or other paths.
* <p>
* Application code must explicitly invoke the <code>Path.dispose()</code>
* method to release the operating system resources managed by each instance
* when those instances are no longer required.
* </p>
* <p>
* This class requires the operating system's advanced graphics subsystem
* which may not be available on some platforms.
* </p>
*
* @see <a href="http://www.eclipse.org/swt/snippets/#path">Path, Pattern snippets</a>
* @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: GraphicsExample</a>
* @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
*
* @since 3.1
*/
public class Path extends Resource {
/**
* the OS resource for the Path
* (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;
int currentFigure, currentPoint;
/**
* Constructs a new empty Path.
* <p>
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
* </p>
*
* @param device the device on which to allocate the path
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the device is null and there is no current device</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
* </ul>
* @exception SWTError <ul>
* <li>ERROR_NO_HANDLES if a handle for the path could not be obtained</li>
* </ul>
*
* @see #dispose()
*/
public Path (Device device) {
super(device);
handle = OS.gcnew_PathGeometry();
if (handle == 0) SWT.error(SWT.ERROR_NO_HANDLES);
init();
}
/**
* Constructs a new Path that is a copy of <code>path</code>. If
* <code>flatness</code> is less than or equal to zero, an unflatten
* copy of the path is created. Otherwise, it specifies the maximum
* error between the path and its flatten copy. Smaller numbers give
* better approximation.
* <p>
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
* </p>
*
* @param device the device on which to allocate the path
* @param path the path to make a copy
* @param flatness the flatness value
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the device is null and there is no current device</li>
* <li>ERROR_NULL_ARGUMENT - if the path is null</li>
* <li>ERROR_INVALID_ARGUMENT - if the path has been disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
* </ul>
* @exception SWTError <ul>
* <li>ERROR_NO_HANDLES if a handle for the path could not be obtained</li>
* </ul>
*
* @see #dispose()
* @since 3.4
*/
public Path (Device device, Path path, float flatness) {
super(device);
if (path == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (path.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
flatness = Math.max(0, flatness);
if (flatness == 0) {
handle = OS.PathGeometry_Clone(path.handle);
} else {
handle = OS.Geometry_GetFlattenedPathGeometry(path.handle, flatness, OS.ToleranceType_Absolute);
}
if (handle == 0) SWT.error(SWT.ERROR_NO_HANDLES);
init();
}
/**
* Constructs a new Path with the specifed PathData.
* <p>
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
* </p>
*
* @param device the device on which to allocate the path
* @param data the data for the path
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the device is null and there is no current device</li>
* <li>ERROR_NULL_ARGUMENT - if the data is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
* </ul>
* @exception SWTError <ul>
* <li>ERROR_NO_HANDLES if a handle for the path could not be obtained</li>
* </ul>
*
* @see #dispose()
* @since 3.4
*/
public Path (Device device, PathData data) {
this(device);
if (data == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
init(data);
}
/**
* Adds to the receiver a circular or elliptical arc that lies within
* the specified rectangular area.
* <p>
* The resulting arc begins at <code>startAngle</code> and extends
* for <code>arcAngle</code> degrees.
* 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
* @param y the y coordinate of the upper-left corner of the arc
* @param width the width of the arc
* @param height the height of the arc
* @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 addArc(float x, float y, float width, float height, float startAngle, float arcAngle) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (width < 0) {
x = x + width;
width = -width;
}
if (height < 0) {
y = y + height;
height = -height;
}
if (width == 0 || height == 0 || arcAngle == 0) return;
boolean isNegative = arcAngle < 0;
boolean isLargeAngle = arcAngle > 180 || arcAngle < -180;
arcAngle = arcAngle + startAngle;
if (isNegative) {
// swap angles
float 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;
if (currentFigure == 0) {
currentFigure = OS.gcnew_PathFigure();
int figures = OS.PathGeometry_Figures(handle);
OS.PathFigureCollection_Add(figures, currentFigure);
OS.GCHandle_Free(figures);
}
int startPoint = OS.gcnew_Point(x1, y1);
int endPoint = OS.gcnew_Point(x2, y2);
int segments = OS.PathFigure_Segments(currentFigure);
if (OS.PathSegmentCollection_Count(segments) != 0) {
int segment = OS.gcnew_LineSegment(startPoint, true);
OS.PathSegmentCollection_Add(segments, segment);
OS.GCHandle_Free(segment);
} else {
OS.PathFigure_StartPoint(currentFigure, startPoint);
}
if (arcAngle >= 360 || arcAngle <= -360) {
int rect = OS.gcnew_Rect(x, y, width, height);
int geometry = OS.gcnew_EllipseGeometry(rect);
OS.PathGeometry_AddGeometry(handle, geometry);
OS.GCHandle_Free(geometry);
OS.GCHandle_Free(rect);
OS.GCHandle_Free(currentFigure);
currentFigure = 0;
} else {
int size = OS.gcnew_Size(width / 2.0, height / 2.0);
int arc = OS.gcnew_ArcSegment(endPoint, size, 0, isLargeAngle, OS.SweepDirection_Clockwise, true);
OS.PathSegmentCollection_Add(segments, arc);
OS.GCHandle_Free(size);
OS.GCHandle_Free(arc);
}
OS.GCHandle_Free(segments);
OS.GCHandle_Free(startPoint);
if (currentPoint != 0) OS.GCHandle_Free(currentPoint);
currentPoint = endPoint;
}
/**
* Adds to the receiver the path described by the parameter.
*
* @param path the path to add to the receiver
*
* @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>
*/
public void addPath(Path path) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (path == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (path.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
OS.PathGeometry_AddGeometry(handle, path.handle);
if (path.currentPoint != 0) {
currentPoint = OS.gcnew_Point(OS.Point_X(path.currentPoint), OS.Point_Y(path.currentPoint));
}
int figures = OS.PathGeometry_Figures(handle);
int count = OS.PathFigureCollection_Count(figures);
OS.GCHandle_Free(figures);
if (count != 0) {
int figure = OS.PathGeometry_Figures(handle, count - 1);
if (!OS.PathFigure_IsClosed(figure)) {
currentFigure = figure;
return;
}
OS.GCHandle_Free(figure);
}
}
/**
* Adds to the receiver the rectangle specified by x, y, width and height.
*
* @param x the x coordinate of the rectangle to add
* @param y the y coordinate of the rectangle to add
* @param width the width of the rectangle to add
* @param height the height of the rectangle to add
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void addRectangle(float x, float y, float width, float height) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
int rect = OS.gcnew_Rect(x, y, width, height);
int geometry = OS.gcnew_RectangleGeometry(rect);
OS.PathGeometry_AddGeometry(handle, geometry);
OS.GCHandle_Free(geometry);
OS.GCHandle_Free(rect);
if (currentFigure != 0) OS.GCHandle_Free(currentFigure);
currentFigure = 0;
int point = OS.gcnew_Point(x, y);
if (currentPoint != 0) OS.GCHandle_Free(currentPoint);
currentPoint = point;
}
/**
* Adds to the receiver the pattern of glyphs generated by drawing
* the given string using the given font starting at the point (x, y).
*
* @param string the text to use
* @param x the x coordinate of the starting point
* @param y the y coordinate of the starting point
* @param font the font to use
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the font is null</li>
* <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 addString(String string, float x, float y, Font font) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (font == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (font.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
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();
int point = OS.gcnew_Point(x, y);
int brush = OS.Brushes_White();
int text = OS.gcnew_FormattedText(str, culture, OS.FlowDirection_LeftToRight, font.handle, font.size, brush);
int geometry = OS.FormattedText_BuildGeometry(text, point);
OS.PathGeometry_AddGeometry(handle, geometry);
OS.GCHandle_Free(brush);
OS.GCHandle_Free(geometry);
OS.GCHandle_Free(culture);
OS.GCHandle_Free(str);
OS.GCHandle_Free(point);
OS.GCHandle_Free(text);
if (currentFigure != 0) OS.GCHandle_Free(currentFigure);
currentFigure = 0;
if (currentPoint != 0) OS.GCHandle_Free(currentPoint);
currentPoint = 0;
}
/**
* Closes the current sub path by adding to the receiver a line
* from the current point of the path back to the starting point
* of the sub path.
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void close() {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (currentFigure != 0) OS.PathFigure_IsClosed(currentFigure, true);
currentFigure = 0;
}
/**
* Returns <code>true</code> if the specified point is contained by
* the receiver and false otherwise.
* <p>
* If outline is <code>true</code>, the point (x, y) checked for containment in
* the receiver's outline. If outline is <code>false</code>, the point is
* checked to see if it is contained within the bounds of the (closed) area
* covered by the receiver.
*
* @param x the x coordinate of the point to test for containment
* @param y the y coordinate of the point to test for containment
* @param gc the GC to use when testing for containment
* @param outline controls whether to check the outline or contained area of the path
* @return <code>true</code> if the path contains the point and <code>false</code> otherwise
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the gc is null</li>
* <li>ERROR_INVALID_ARGUMENT - if the gc has been disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public boolean contains(float x, float y, GC gc, boolean outline) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (gc == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (gc.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
gc.checkGC(GC.LINE_CAP | GC.LINE_JOIN | GC.LINE_STYLE | GC.LINE_WIDTH | GC.LINE_MITERLIMIT | GC.TRANSFORM);
boolean result;
int point = OS.gcnew_Point(x, y);
if (outline) {
result = OS.Geometry_StrokeContains(handle, gc.data.pen, point);
} else {
result = OS.Geometry_FillContains(handle, point);
}
OS.GCHandle_Free(point);
return result;
}
/**
* Adds to the receiver a cubic bezier curve based on the parameters.
*
* @param cx1 the x coordinate of the first control point of the spline
* @param cy1 the y coordinate of the first control of the spline
* @param cx2 the x coordinate of the second control of the spline
* @param cy2 the y coordinate of the second control of the spline
* @param x the x coordinate of the end point of the spline
* @param y the y coordinate of the end point of the spline
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void cubicTo(float cx1, float cy1, float cx2, float cy2, float x, float y) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
int controlPoint1 = OS.gcnew_Point(cx1, cy1);
int controlPoint2 = OS.gcnew_Point(cx2, cy2);
int point = OS.gcnew_Point(x, y);
if (currentFigure == 0) newFigure();
if (currentPoint != 0) OS.GCHandle_Free(currentPoint);
currentPoint = point;
int segment = OS.gcnew_BezierSegment(controlPoint1, controlPoint2, point, true);
int segments = OS.PathFigure_Segments(currentFigure);
OS.PathSegmentCollection_Add(segments, segment);
OS.GCHandle_Free(segments);
OS.GCHandle_Free(segment);
OS.GCHandle_Free(controlPoint1);
OS.GCHandle_Free(controlPoint2);
}
void destroy() {
OS.GCHandle_Free(handle);
handle = 0;
if (currentFigure != 0) OS.GCHandle_Free(currentFigure);
currentFigure = 0;
if (currentPoint != 0) OS.GCHandle_Free(currentPoint);
currentPoint = 0;
}
/**
* Replaces the first four elements in the parameter with values that
* describe the smallest rectangle that will completely contain the
* receiver (i.e. the bounding box).
*
* @param bounds the array to hold the result
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the parameter is null</li>
* <li>ERROR_INVALID_ARGUMENT - if the parameter is too small to hold the bounding box</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void getBounds(float[] bounds) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (bounds == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (bounds.length < 4) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
int rect = OS.PathGeometry_Bounds(handle);
bounds[0] = (float)OS.Rect_X(rect);
bounds[1] = (float)OS.Rect_Y(rect);
bounds[2] = (float)OS.Rect_Width(rect);
bounds[3] = (float)OS.Rect_Height(rect);
OS.GCHandle_Free(rect);
}
/**
* Replaces the first two elements in the parameter with values that
* describe the current point of the path.
*
* @param point the array to hold the result
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the parameter is null</li>
* <li>ERROR_INVALID_ARGUMENT - if the parameter is too small to hold the end point</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void getCurrentPoint(float[] point) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (point == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (point.length < 2) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
if (currentPoint != 0) {
point[0] = (float)OS.Point_X(currentPoint);
point[1] = (float)OS.Point_Y(currentPoint);
} else {
point[0] = point[1] = 0;
}
}
/**
* Returns a device independent representation of the receiver.
*
* @return the PathData for the receiver
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*
* @see PathData
*/
public PathData getPathData() {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
byte[] types = new byte[128];
float[] points = new float[128 * 2];
int pointsIndex = 0, typesIndex = 0;
int figures = OS.PathGeometry_Figures(handle);
int figureCount = OS.PathFigureCollection_Count(figures);
OS.GCHandle_Free(figures);
for (int i = 0; i < figureCount; i++) {
int figure = OS.PathGeometry_Figures(handle, i);
int segments = OS.PathFigure_Segments(figure);
int segmentCount = OS.PathSegmentCollection_Count(segments);
OS.GCHandle_Free(segments);
for (int j = 0; j < segmentCount; j++) {
int segment = OS.PathFigure_Segments(figure, j);
int type = OS.Object_GetType(segment);
//TODO - need get points out of every segment
//TODO - need to convert ArcSegment to beziers
OS.GCHandle_Free(type);
OS.GCHandle_Free(segment);
}
OS.GCHandle_Free(figure);
}
if (typesIndex != types.length) {
byte[] newTypes = new byte[typesIndex];
System.arraycopy(types, 0, newTypes, 0, typesIndex);
types = newTypes;
}
if (pointsIndex != points.length) {
float[] newPoints = new float[pointsIndex];
System.arraycopy(points, 0, newPoints, 0, pointsIndex);
points = newPoints;
}
PathData result = new PathData();
result.types = types;
result.points = points;
return result;
}
/**
* Adds to the receiver a line from the current point to
* the point specified by (x, y).
*
* @param x the x coordinate of the end of the line to add
* @param y the y coordinate of the end of the line to add
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void lineTo(float x, float y) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
int point = OS.gcnew_Point(x, y);
if (currentFigure == 0) newFigure();
if (currentPoint != 0) OS.GCHandle_Free(currentPoint);
currentPoint = point;
int segment = OS.gcnew_LineSegment(point, true);
int segments = OS.PathFigure_Segments(currentFigure);
OS.PathSegmentCollection_Add(segments, segment);
OS.GCHandle_Free(segments);
OS.GCHandle_Free(segment);
}
void init(PathData data) {
byte[] types = data.types;
float[] points = data.points;
for (int i = 0, j = 0; i < types.length; i++) {
switch (types[i]) {
case SWT.PATH_MOVE_TO:
moveTo(points[j++], points[j++]);
break;
case SWT.PATH_LINE_TO:
lineTo(points[j++], points[j++]);
break;
case SWT.PATH_CUBIC_TO:
cubicTo(points[j++], points[j++], points[j++], points[j++], points[j++], points[j++]);
break;
case SWT.PATH_QUAD_TO:
quadTo(points[j++], points[j++], points[j++], points[j++]);
break;
case SWT.PATH_CLOSE:
close();
break;
default:
dispose();
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
}
}
/**
* Returns <code>true</code> if the Path has been disposed,
* and <code>false</code> otherwise.
* <p>
* This method gets the dispose state for the Path.
* When a Path has been disposed, it is an error to
* invoke any other method (except {@link #dispose()}) using the Path.
*
* @return <code>true</code> when the Path is disposed, and <code>false</code> otherwise
*/
public boolean isDisposed() {
return handle == 0;
}
/**
* Sets the current point of the receiver to the point
* specified by (x, y). Note that this starts a new
* sub path.
*
* @param x the x coordinate of the new end point
* @param y the y coordinate of the new end point
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void moveTo(float x, float y) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
int point = OS.gcnew_Point(x, y);
if (currentPoint != 0) OS.GCHandle_Free(currentPoint);
currentPoint = point;
if (currentFigure != 0) {
int segments = OS.PathFigure_Segments(currentFigure);
int count = OS.PathSegmentCollection_Count(segments);
OS.GCHandle_Free(segments);
if (count == 0) {
OS.PathFigure_StartPoint(currentFigure, point);
return;
}
}
if (currentFigure != 0) OS.GCHandle_Free(currentFigure);
newFigure();
}
void newFigure() {
currentFigure = OS.gcnew_PathFigure();
if (currentPoint != 0) {
OS.PathFigure_StartPoint(currentFigure, currentPoint);
}
int figures = OS.PathGeometry_Figures(handle);
OS.PathFigureCollection_Add(figures, currentFigure);
OS.GCHandle_Free(figures);
}
/**
* Adds to the receiver a quadratic curve based on the parameters.
*
* @param cx the x coordinate of the control point of the spline
* @param cy the y coordinate of the control point of the spline
* @param x the x coordinate of the end point of the spline
* @param y the y coordinate of the end point of the spline
*
* @exception SWTException <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public void quadTo(float cx, float cy, float x, float y) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
int controlPoint = OS.gcnew_Point(cx, cy);
int point = OS.gcnew_Point(x, y);
if (currentFigure == 0) newFigure();
if (currentPoint != 0) OS.GCHandle_Free(currentPoint);
currentPoint = point;
int segment = OS.gcnew_QuadraticBezierSegment(controlPoint, point, true);
int segments = OS.PathFigure_Segments(currentFigure);
OS.PathSegmentCollection_Add(segments, segment);
OS.GCHandle_Free(segments);
OS.GCHandle_Free(segment);
OS.GCHandle_Free(controlPoint);
}
/**
* 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 "Path {*DISPOSED*}";
return "Path {" + handle + "}";
}
}