/*******************************************************************************
* Copyright (c) 2006 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.examples.graphics;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
/**
* This tab shows the effects of applying various interpolation algorithms to
* images that have been stretched or shrunk.
*/
public class InterpolationTab extends GraphicsTab {
Combo imageCb; // combo for selecting images
public InterpolationTab(GraphicsExample example) {
super(example);
}
@Override
public String getCategory() {
return GraphicsExample.getResourceString("Image"); //$NON-NLS-1$
}
@Override
public String getText() {
return GraphicsExample.getResourceString("Interpolation"); //$NON-NLS-1$
}
@Override
public String getDescription() {
return GraphicsExample.getResourceString("ImageInterpolationDesc"); //$NON-NLS-1$
}
@Override
public void createControlPanel(Composite parent) {
Composite comp;
GridLayout gridLayout = new GridLayout(2, false);
// create drop down combo
comp = new Composite(parent, SWT.NONE);
comp.setLayout(gridLayout);
new Label(comp, SWT.CENTER).setText(GraphicsExample
.getResourceString("Image")); //$NON-NLS-1$
imageCb = new Combo(comp, SWT.DROP_DOWN);
imageCb.add(GraphicsExample.getResourceString("House")); //$NON-NLS-1$
imageCb.add(GraphicsExample.getResourceString("Question")); //$NON-NLS-1$
imageCb.add(GraphicsExample.getResourceString("Task")); //$NON-NLS-1$
imageCb.add(GraphicsExample.getResourceString("Font")); //$NON-NLS-1$
imageCb.add(GraphicsExample.getResourceString("Cube")); //$NON-NLS-1$
imageCb.add(GraphicsExample.getResourceString("SWT")); //$NON-NLS-1$
imageCb.add(GraphicsExample.getResourceString("Ovals")); //$NON-NLS-1$
imageCb.select(0);
imageCb.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
example.redraw();
}
});
}
@Override
public void paint(GC gc, int width, int height) {
if (!example.checkAdvancedGraphics()) return;
Device device = gc.getDevice();
float scaleX = 10f;
float scaleY = 10f;
Image image = null;
switch (imageCb.getSelectionIndex()) {
case 0:
image = GraphicsExample.loadImage(device, GraphicsExample.class, "home_nav.gif");
break;
case 1:
image = GraphicsExample.loadImage(device, GraphicsExample.class, "help.gif");
break;
case 2:
image = GraphicsExample.loadImage(device, GraphicsExample.class, "task.gif");
break;
case 3:
image = GraphicsExample.loadImage(device, GraphicsExample.class, "font.gif");
break;
case 4:
image = GraphicsExample.loadImage(device, GraphicsExample.class, "cube.png");
scaleX = 0.75f;
scaleY = 0.5f;
break;
case 5:
image = GraphicsExample.loadImage(device, GraphicsExample.class, "swt.png");
scaleX = 0.4f;
scaleY = 0.8f;
break;
case 6:
image = GraphicsExample.loadImage(device, GraphicsExample.class, "ovals.png");
scaleX = 1.1f;
scaleY = 0.5f;
break;
}
Rectangle bounds = image.getBounds();
// draw the original image
gc.drawImage(image, (width-bounds.width)/2, 20);
Font font = new Font(device, getPlatformFont(), 20, SWT.NORMAL);
gc.setFont(font);
// write some text below the original image
String text = GraphicsExample.getResourceString("OriginalImg"); //$NON-NLS-1$
Point size = gc.stringExtent(text);
gc.drawString(text, (width-size.x)/2, 25 + bounds.height, true);
Transform transform = new Transform(device);
transform.translate((width - (bounds.width * scaleX + 10) * 4) / 2, 25 + bounds.height + size.y +
(height - (25 + bounds.height + size.y + bounds.height*scaleY)) / 2);
transform.scale(scaleX, scaleY);
// --- draw strings ---
float[] point = new float[2];
text = GraphicsExample.getResourceString("None"); //$NON-NLS-1$
size = gc.stringExtent(text);
point[0] = (scaleX*bounds.width + 5 - size.x)/(2*scaleX);
point[1] = bounds.height;
transform.transform(point);
gc.drawString(text, (int)point[0], (int)point[1], true);
text = GraphicsExample.getResourceString("Low"); //$NON-NLS-1$
size = gc.stringExtent(text);
point[0] = (scaleX*bounds.width + 5 - size.x)/(2*scaleX) + bounds.width;
point[1] = bounds.height;
transform.transform(point);
gc.drawString(text, (int)point[0], (int)point[1], true);
text = GraphicsExample.getResourceString("Default"); //$NON-NLS-1$
size = gc.stringExtent(text);
point[0] = (scaleX*bounds.width + 5 - size.x)/(2*scaleX) + 2*bounds.width;
point[1] = bounds.height;
transform.transform(point);
gc.drawString(text, (int)point[0], (int)point[1], true);
text = GraphicsExample.getResourceString("High"); //$NON-NLS-1$
size = gc.stringExtent(text);
point[0] = (scaleX*bounds.width + 5 - size.x)/(2*scaleX) + 3*bounds.width;
point[1] = bounds.height;
transform.transform(point);
gc.drawString(text, (int)point[0], (int)point[1], true);
gc.setTransform(transform);
transform.dispose();
// --- draw images ---
// no interpolation
gc.setInterpolation(SWT.NONE);
gc.drawImage(image, 0, 0);
// low interpolation
gc.setInterpolation(SWT.LOW);
gc.drawImage(image, bounds.width, 0);
// default interpolation
gc.setInterpolation(SWT.DEFAULT);
gc.drawImage(image, 2*bounds.width, 0);
// high interpolation
gc.setInterpolation(SWT.HIGH);
gc.drawImage(image, 3*bounds.width, 0);
font.dispose();
if (image != null) image.dispose();
}
/**
* Returns the name of a valid font for the host platform.
*/
static String getPlatformFont() {
if(SWT.getPlatform() == "win32") {
return "Arial";
} else if (SWT.getPlatform() == "motif") {
return "Helvetica";
} else if (SWT.getPlatform() == "gtk") {
return "Baekmuk Batang";
} else if (SWT.getPlatform() == "carbon") {
return "Arial";
} else { // photon, etc ...
return "Verdana";
}
}
}