Java by API/org.eclipse.swt.graphics/Region

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Region: add(int[] shape)

   <source lang="java">

import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.Region; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class MainClass {

 public static void main(String[] a) {
   Display display = new Display();
   final Shell shell = new Shell(display);
   Region region = new Region();
   region.add(createCircle(50, 50, 50));
   region.subtract(createCircle(50, 50, 20));
   shell.setRegion(region);
   shell.setSize(region.getBounds().width, region.getBounds().height);
   shell.setBackground(display.getSystemColor(SWT.COLOR_BLUE));
   
   shell.open();
   while (!shell.isDisposed()) {
     if (!display.readAndDispatch()) {
       display.sleep();
     }
   }
   display.dispose();
 }
 static int[] createCircle(int xOffset, int yOffset, int radius) {
   int[] circlePoints = new int[10 * radius];
   for (int loopIndex = 0; loopIndex < 2 * radius + 1; loopIndex++) {
     int xCurrent = loopIndex - radius;
     int yCurrent = (int) Math.sqrt(radius * radius - xCurrent * xCurrent);
     int doubleLoopIndex = 2 * loopIndex;
     
     circlePoints[doubleLoopIndex] = xCurrent + xOffset;
     circlePoints[doubleLoopIndex + 1] = yCurrent + yOffset;
     circlePoints[10 * radius - doubleLoopIndex - 2] = xCurrent + xOffset;
     circlePoints[10 * radius - doubleLoopIndex - 1] = -yCurrent + yOffset;
   }
   
   return circlePoints;
 }  

}

      </source>