/*******************************************************************************
 * Copyright (c) 2000, 2008 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
 * D Port:
 *     Thomas Demmer <t_demmer AT web DOT de>
 *******************************************************************************/
module button.Snippet294;

/* Port OK */
import dwt.DWT;
import dwt.graphics.Image;
import dwt.graphics.Region;
import dwt.layout.FillLayout;
import dwt.widgets.Button;
import dwt.widgets.Display;
import dwt.widgets.Event;
import dwt.widgets.Listener;
import dwt.widgets.Shell;

import dwt.dwthelper.utils;
import tango.util.Convert;

void main(String[] args){
  Snippet294.main(args);
}

/*
 * Region on a control: create a non-rectangular button
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 *
 * @since 3.4
 */

public class Snippet294 {

  static int[] circle(int r, int offsetX, int offsetY) {
    int[] polygon = new int[8 * r + 4];
    // x^2 + y^2 = r^2
    for (int i = 0; i < 2 * r + 1; i++) {
      int x = i - r;
      int y = cast(int)Math.sqrt(cast(real)(r*r - x*x));
      polygon[2*i] = offsetX + x;
      polygon[2*i+1] = offsetY + y;
      polygon[8*r - 2*i - 2] = offsetX + x;
      polygon[8*r - 2*i - 1] = offsetY - y;
    }
    return polygon;
  }

  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("Regions on a Control");
    shell.setLayout(new FillLayout());
    shell.setBackground(display.getSystemColor(DWT.COLOR_DARK_RED));

    Button b2 = new Button(shell, DWT.PUSH);
    b2.setText("Button with Regions");

    // define a region that looks like a circle with two holes in ot
    Region region = new Region();
    region.add(circle(67, 87, 77));
    region.subtract(circle(20, 87, 47));
    region.subtract(circle(20, 87, 113));

    // define the shape of the button using setRegion
    b2.setRegion(region);
    b2.setLocation(100,50);

    b2.addListener(DWT.Selection, new class() Listener {
        public void handleEvent(Event e) {
	  shell.close();
	}
		   });

    shell.setSize(200,200);
    shell.open();

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