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/*******************************************************************************
* Copyright (c) 2000, 2005 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.snippets;
/*
* Use transformation matrices to reflect, rotate and shear images
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*/
import org.eclipse.swt.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class Snippet207 {
public static void main(String[] args) {
final Display display = new Display();
final Image image = new Image(display, 110, 60);
GC gc = new GC(image);
Font font = new Font(display, "Times", 30, SWT.BOLD);
gc.setFont(font);
gc.setBackground(display.getSystemColor(SWT.COLOR_RED));
gc.fillRectangle(0, 0, 110, 60);
gc.setForeground(display.getSystemColor(SWT.COLOR_WHITE));
gc.drawText("SWT", 10, 10, true);
font.dispose();
gc.dispose();
final Rectangle rect = image.getBounds();
Shell shell = new Shell(display);
shell.setText("Matrix Tranformations");
shell.setLayout(new FillLayout());
final Canvas canvas = new Canvas(shell, SWT.DOUBLE_BUFFERED);
canvas.addPaintListener(new PaintListener () {
public void paintControl(PaintEvent e) {
GC gc = e.gc;
gc.setAdvanced(true);
if (!gc.getAdvanced()){
gc.drawText("Advanced graphics not supported", 30, 30, true);
return;
}
// Original image
int x = 30, y = 30;
gc.drawImage(image, x, y);
x += rect.width + 30;
Transform transform = new Transform(display);
// Note that the tranform is applied to the whole GC therefore
// the coordinates need to be adjusted too.
// Reflect around the y axis.
transform.setElements(-1, 0, 0, 1, 0 ,0);
gc.setTransform(transform);
gc.drawImage(image, -1*x-rect.width, y);
x = 30; y += rect.height + 30;
// Reflect around the x axis.
transform.setElements(1, 0, 0, -1, 0, 0);
gc.setTransform(transform);
gc.drawImage(image, x, -1*y-rect.height);
x += rect.width + 30;
// Reflect around the x and y axes
transform.setElements(-1, 0, 0, -1, 0, 0);
gc.setTransform(transform);
gc.drawImage(image, -1*x-rect.width, -1*y-rect.height);
x = 30; y += rect.height + 30;
// Shear in the x-direction
transform.setElements(1, 0, -1, 1, 0, 0);
gc.setTransform(transform);
gc.drawImage(image, 300, y);
// Shear in y-direction
transform.setElements(1, -1, 0, 1, 0, 0);
gc.setTransform(transform);
gc.drawImage(image, 150, 475);
// Rotate by 45 degrees
float cos45 = (float)Math.cos(Math.PI/4);
float sin45 = (float)Math.sin(Math.PI/4);
transform.setElements(cos45, sin45, -sin45, cos45, 0, 0);
gc.setTransform(transform);
gc.drawImage(image, 400, 60);
transform.dispose();
}
});
shell.setSize(350, 550);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
image.dispose();
display.dispose();
}
}
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