CanvasExample.java Source code

Introduction

Here is the source code for CanvasExample.java

Source

/******************************************************************************
 * Copyright (c) 1998, 2004 Jackwind Li Guojie
 * All right reserved. 
 * 
 * Created on Jan 24, 2004 3:03:14 PM by JACK
 * $Id$
 * 
 * visit: http://www.asprise.com/swt
 *****************************************************************************/

/*
 * Canvas example snippet: implement tab traversal (behave like a tab group)
 *
 * For a list of all SWT example snippets see
 * http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
 */

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.Shell;

public class CanvasExample {
    public static void main(String[] args) {
        Display display = new Display();

        Image small = new Image(display, 16, 16);
        GC gc = new GC(small);
        gc.setBackground(display.getSystemColor(SWT.COLOR_RED));
        gc.fillArc(0, 0, 16, 16, 45, 270);
        gc.dispose();

        Image large = new Image(display, 32, 32);
        gc = new GC(large);
        gc.setBackground(display.getSystemColor(SWT.COLOR_BLUE));
        gc.fillArc(0, 0, 32, 32, 45, 270);
        gc.dispose();

        /* Provide different resolutions for icons to get
         * high quality rendering wherever the OS needs 
         * large icons. For example, the ALT+TAB window 
         * on certain systems uses a larger icon.
         */
        Shell shell = new Shell(display);
        shell.setText("Small and Large icons");
        shell.setImages(new Image[] { small, large });

        /* No large icon: the OS will scale up the
         * small icon when it needs a large one.
         */
        Shell shell2 = new Shell(display);
        shell2.setText("Small icon");
        shell2.setImage(small);

        shell.open();
        shell2.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}