Bug430846.java

Bug430846.java

package org.eclipse.bugs.snippet;
 
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
 
public class Bug430846 {
 
	public static void main(String[] args) {
		Display display = Display.getDefault();
		Shell shell = new Shell(display);
 
		// each separated area size for source image
		final int srcBlockSize = 40;
		
		// each separated area size for destination
		final int destBlockSize = 80;
		
		final int destBlockGap = 10;
		final int srcAndDestGap = 10;
		final int gridSize = 5;
		
		final int srcSize = srcBlockSize*3;
		
		final Image srcImage = new Image(display, srcBlockSize * 3, srcBlockSize * 3);
		GC gc = new GC(srcImage);
		gc.setBackground(display.getSystemColor(SWT.COLOR_WHITE));
		gc.fillRectangle(0, 0, srcSize, srcSize);
		
		// grid
		gc.setForeground(display.getSystemColor(SWT.COLOR_GRAY));
		for(int x = 0; x<srcSize; x+=gridSize){
			gc.drawLine(x, 0, x, srcSize);
			gc.drawLine(0, x, srcSize, x);
		}
		
		// area text
		gc.setForeground(display.getSystemColor(SWT.COLOR_RED));
		for (int row = 0; row < 3; row++) {
			for (int col = 0; col < 3; col++) {
				gc.drawText(row + "," + col, col * srcBlockSize, row * srcBlockSize, true);
			}
		}
		
	
		gc.dispose();
 
		shell.addListener(SWT.Paint, new Listener() {
			@Override
			public void handleEvent(Event e) {
				e.gc.drawImage(srcImage, 0, 0);
 
				for (int row = 0; row < 3; row++) {
					for (int col = 0; col < 3; col++) {
						e.gc.drawImage(
							srcImage, 
							col * srcBlockSize, row * srcBlockSize, srcBlockSize, srcBlockSize, 
							col * (destBlockSize+destBlockGap) + srcBlockSize * 3 + srcAndDestGap, row * (destBlockSize+destBlockGap), destBlockSize, destBlockSize
						);
					}
				}
			}
		});
 
		shell.open();
 
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch()) {
				display.sleep();
			}
		}
 
		display.dispose();
	}
}