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Cursor: create a color cursor from a source and a mask

Cursor: create a color cursor from a source and a mask


/*
 * Cursor example snippet: create a color cursor from a source and a mask
 *
 * For a list of all SWT example snippets see
 * http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#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.Cursor;
import org.eclipse.swt.graphics.GC;
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.Display;
import org.eclipse.swt.widgets.Shell;

public class Snippet119 {

  static byte[] srcData = { (byte) 0x11, (byte) 0x11, (byte) 0x11,
      (byte) 0x00, (byte) 0x00, (byte) 0x11, (byte) 0x11, (byte) 0x11,
      (byte) 0x11, (byte) 0x10, (byte) 0x00, (byte) 0x01, (byte) 0x10,
      (byte) 0x00, (byte) 0x01, (byte) 0x11, (byte) 0x11, (byte) 0x00,
      (byte) 0x22, (byte) 0x01, (byte) 0x10, (byte) 0x33, (byte) 0x00,
      (byte) 0x11, (byte) 0x10, (byte) 0x02, (byte) 0x22, (byte) 0x01,
      (byte) 0x10, (byte) 0x33, (byte) 0x30, (byte) 0x01, (byte) 0x10,
      (byte) 0x22, (byte) 0x22, (byte) 0x01, (byte) 0x10, (byte) 0x33,
      (byte) 0x33, (byte) 0x01, (byte) 0x10, (byte) 0x22, (byte) 0x22,
      (byte) 0x01, (byte) 0x10, (byte) 0x33, (byte) 0x33, (byte) 0x01,
      (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
      (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x01, (byte) 0x11,
      (byte) 0x11, (byte) 0x01, (byte) 0x10, (byte) 0x11, (byte) 0x11,
      (byte) 0x10, (byte) 0x01, (byte) 0x11, (byte) 0x11, (byte) 0x01,
      (byte) 0x10, (byte) 0x11, (byte) 0x11, (byte) 0x10, (byte) 0x00,
      (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
      (byte) 0x00, (byte) 0x00, (byte) 0x10, (byte) 0x44, (byte) 0x44,
      (byte) 0x01, (byte) 0x10, (byte) 0x55, (byte) 0x55, (byte) 0x01,
      (byte) 0x10, (byte) 0x44, (byte) 0x44, (byte) 0x01, (byte) 0x10,
      (byte) 0x55, (byte) 0x55, (byte) 0x01, (byte) 0x10, (byte) 0x04,
      (byte) 0x44, (byte) 0x01, (byte) 0x10, (byte) 0x55, (byte) 0x50,
      (byte) 0x01, (byte) 0x11, (byte) 0x00, (byte) 0x44, (byte) 0x01,
      (byte) 0x10, (byte) 0x55, (byte) 0x00, (byte) 0x11, (byte) 0x11,
      (byte) 0x10, (byte) 0x00, (byte) 0x01, (byte) 0x10, (byte) 0x00,
      (byte) 0x01, (byte) 0x11, (byte) 0x11, (byte) 0x11, (byte) 0x11,
      (byte) 0x00, (byte) 0x00, (byte) 0x11, (byte) 0x11, (byte) 0x11, };

  static byte[] mskData = { (byte) 0x03, (byte) 0xc0, (byte) 0x1f,
      (byte) 0xf8, (byte) 0x3f, (byte) 0xfc, (byte) 0x7f, (byte) 0xfe,
      (byte) 0x7f, (byte) 0xfe, (byte) 0x7f, (byte) 0xfe, (byte) 0xff,
      (byte) 0xff, (byte) 0xfe, (byte) 0x7f, (byte) 0xfe, (byte) 0x7f,
      (byte) 0xff, (byte) 0xff, (byte) 0x7f, (byte) 0xfe, (byte) 0x7f,
      (byte) 0xfe, (byte) 0x7f, (byte) 0xfe, (byte) 0x3f, (byte) 0xfc,
      (byte) 0x1f, (byte) 0xf8, (byte) 0x03, (byte) 0xc0 };

  public static void main(String[] args) {
    Display display = new Display();
    Color white = display.getSystemColor(SWT.COLOR_WHITE);
    Color black = display.getSystemColor(SWT.COLOR_BLACK);
    Color yellow = display.getSystemColor(SWT.COLOR_YELLOW);
    Color red = display.getSystemColor(SWT.COLOR_RED);
    Color green = display.getSystemColor(SWT.COLOR_GREEN);
    Color blue = display.getSystemColor(SWT.COLOR_BLUE);

    // Create a source ImageData of depth 4
    PaletteData palette = new PaletteData(new RGB[] { black.getRGB(),
        white.getRGB(), yellow.getRGB(), red.getRGB(), blue.getRGB(),
        green.getRGB() });
    ImageData sourceData = new ImageData(16, 16, 4, palette, 1, srcData);

    // Create a mask ImageData of depth 1 (monochrome)
    palette = new PaletteData(new RGB[] { black.getRGB(), white.getRGB(), });
    ImageData maskData = new ImageData(16, 16, 1, palette, 1, mskData);

    // Set mask
    sourceData.maskData = maskData.data;
    sourceData.maskPad = maskData.scanlinePad;

    // Create cursor
    Cursor cursor = new Cursor(display, sourceData, 10, 10);

    // Remove mask to draw them separately just to show what they look like
    sourceData.maskData = null;
    sourceData.maskPad = -1;

    Shell shell = new Shell(display);
    final Image source = new Image(display, sourceData);
    final Image mask = new Image(display, maskData);
    shell.addPaintListener(new PaintListener() {
      public void paintControl(PaintEvent e) {
        GC gc = e.gc;
        int x = 10, y = 10;
        String stringSource = "source: ";
        String stringMask = "mask: ";
        gc.drawString(stringSource, x, y);
        gc.drawString(stringMask, x, y + 30);
        x += Math.max(gc.stringExtent(stringSource).x, gc
            .stringExtent(stringMask).x);
        gc.drawImage(source, x, y);
        gc.drawImage(mask, x, y + 30);
      }
    });
    shell.setSize(150, 150);
    shell.open();
    shell.setCursor(cursor);

    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    cursor.dispose();
    source.dispose();
    mask.dispose();
    display.dispose();
  }
}

           
       










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