/*******************************************************************************
 * 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
 * D Port:
 *     Thomas Demmer <t_demmer AT web DOT de>
 *******************************************************************************/
module org.eclipse.swt.snippets.Snippet208;

/*
 * Change hue, saturation and brightness of a color
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 *
 * @since 3.2
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.graphics.PaletteData;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;

import java.lang.all;

void main () {
    PaletteData palette = new PaletteData(0xff, 0xff00, 0xff0000);

    // ImageData showing variations of hue
    ImageData hueData = new ImageData(360, 100, 24, palette);
    float hue = 0;
    for (int x = 0; x < hueData.width; x++) {
        for (int y = 0; y < hueData.height; y++) {
            int pixel = palette.getPixel(new RGB(hue, 1f, 1f));
            hueData.setPixel(x, y, pixel);
        }
        hue += 360f / hueData.width;
    }

    // ImageData showing saturation on x axis and brightness on y axis
    ImageData saturationBrightnessData = new ImageData(360, 360, 24, palette);
    float saturation = 0f;
    float brightness = 1f;
    for (int x = 0; x < saturationBrightnessData.width; x++) {
        brightness = 1f;
        for (int y = 0; y < saturationBrightnessData.height; y++) {
            int pixel = palette.getPixel(new RGB(360f, saturation, brightness));
            saturationBrightnessData.setPixel(x, y, pixel);
            brightness -= 1f / saturationBrightnessData.height;
        }
        saturation += 1f / saturationBrightnessData.width;
    }

    Display display = new Display();
    Image hueImage = new Image(display, hueData);
    Image saturationImage = new Image(display, saturationBrightnessData);
    Shell shell = new Shell(display);
    shell.setText("Hue, Saturation, Brightness");
    GridLayout gridLayout = new GridLayout(2, false);
    gridLayout.verticalSpacing = 10;
    gridLayout.marginWidth = gridLayout.marginHeight = 16;
    shell.setLayout(gridLayout);

    Label label = new Label(shell, SWT.CENTER);
    label.setImage(hueImage);
    GridData data = new GridData(SWT.RIGHT, SWT.CENTER, false, false, 2, 1);
    label.setLayoutData(data);

    label = new Label(shell, SWT.CENTER); //spacer
    label = new Label(shell, SWT.CENTER);
    label.setText("Hue");
    data = new GridData(SWT.CENTER, SWT.CENTER, false, false);
    label.setLayoutData(data);
    label = new Label(shell, SWT.CENTER); //spacer
    data = new GridData(SWT.CENTER, SWT.CENTER, false, false, 2, 1);
    label.setLayoutData(data);

    label = new Label(shell, SWT.LEFT);
    label.setText("Brightness");
    data = new GridData(SWT.LEFT, SWT.CENTER, false, false);
    label.setLayoutData(data);

    label = new Label(shell, SWT.CENTER);
    label.setImage(saturationImage);
    data = new GridData(SWT.CENTER, SWT.CENTER, false, false);
    label.setLayoutData (data);

    label = new Label(shell, SWT.CENTER); //spacer
    label = new Label(shell, SWT.CENTER);
    label.setText("Saturation");
    data = new GridData(SWT.CENTER, SWT.CENTER, false, false);
    label.setLayoutData(data);

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