org.eclipse.swt.snippets.Snippet208.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet208.java

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/*******************************************************************************
 * Copyright (c) 2000, 2005 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.snippets;

/*
 * 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.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet208 {

    public static void main(String[] args) {
        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();
    }

}