/*******************************************************************************
 * 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
 * Port to the D programming language:
 *     Bill Baxter <bill@billbaxter.com>
 *******************************************************************************/
module gc.Snippet207;

/*
 * 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 dwt.DWT;
import dwt.events.PaintEvent;
import dwt.events.PaintListener;
import dwt.graphics.GC;
import dwt.graphics.Transform;
import dwt.graphics.Font;
import dwt.graphics.Rectangle;
import dwt.graphics.Image;
import dwt.layout.FillLayout;
import dwt.widgets.Display;
import dwt.widgets.Shell;
import dwt.widgets.Canvas;

import Math=tango.math.Math;

void main() {
    Display display = new Display();
        
    Image image = new Image(display, 110, 60);
    GC gc = new GC(image);
    Font font = new Font(display, "Times", 30., DWT.BOLD);
    gc.setFont(font);
    gc.setBackground(display.getSystemColor(DWT.COLOR_RED));
    gc.fillRectangle(0, 0, 110, 60);
    gc.setForeground(display.getSystemColor(DWT.COLOR_WHITE));
    gc.drawText("DWT", 10, 10, true);
    font.dispose();
    gc.dispose();
        
    Rectangle rect = image.getBounds();
    Shell shell = new Shell(display);
    shell.setText("Matrix Tranformations");
    shell.setLayout(new FillLayout());
    Canvas canvas = new Canvas(shell, DWT.DOUBLE_BUFFERED);
    canvas.addPaintListener(new class() 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 = Math.cos(45);
                float sin45 = Math.sin(45);
                transform.setElements(cos45, sin45, -sin45, cos45, 0, 0);
                gc.setTransform(transform);
                gc.drawImage(image, 350, 100);
                
                transform.dispose();
            }
        });
        
    shell.setSize(350, 550);
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    image.dispose();
    display.dispose();
}