/*******************************************************************************
 * 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 org.eclipse.swt.snippets.Snippet294;

/* Port OK */
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Region;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;

import java.lang.all;
version(Tango){
    import tango.util.Convert;
} else { // Phobos
    import std.conv;
}

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(SWT.COLOR_DARK_RED));

        Button b2 = new Button(shell, SWT.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(SWT.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();
    }
}