Java Tutorial/SWT/SWT Color

Change hue, saturation and brightness of a color

   <source lang="java">

/*******************************************************************************

* 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
*******************************************************************************/

/*

* 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.PaletteData; import org.eclipse.swt.graphics.RGB; 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; public class ColorChangeHueSaturationBrightness {

 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();
 }

}</source>

Create Transparent Color

   <source lang="java">

/*******************************************************************************

* Copyright (c) 2000, 2006 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
*******************************************************************************/

/*

*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*/

import org.eclipse.swt.SWT; import org.eclipse.swt.events.PaintEvent; import org.eclipse.swt.events.PaintListener; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.ImageData; import org.eclipse.swt.graphics.PaletteData; import org.eclipse.swt.graphics.RGB; import org.eclipse.swt.widgets.Canvas; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class ColorTransparentCreate {

 public static void main(String[] args) {
   final Display display = new Display();
   Shell shell = new Shell(display);
   shell.setBounds(10, 10, 200, 200);
   // create a cursor with a transparent image
   Color white = display.getSystemColor(SWT.COLOR_WHITE);
   Color black = display.getSystemColor(SWT.COLOR_BLACK);
   PaletteData palette = new PaletteData(new RGB[] { white.getRGB(), black.getRGB() });
   final ImageData sourceData = new ImageData(30, 30, 1, palette);
   sourceData.transparentPixel = 0;
   Canvas canvas = new Canvas(shell, SWT.BORDER);
   canvas.setBounds(10, 50, 150, 100);
   
   canvas.addPaintListener(new PaintListener() {
     public void paintControl(PaintEvent e) {
       e.gc.drawString("hide Cursor here", 10, 10);
       e.gc.drawImage(new Image(display, sourceData), 0, 0);
     }
   });
   shell.open();
   while (!shell.isDisposed()) {
     if (!display.readAndDispatch())
       display.sleep();
   }
   display.dispose();
 }

}</source>