Java Tutorial/SWT 2D Graphics/Polygon

Drawing Polygons

   <source lang="java">

import org.eclipse.swt.SWT; import org.eclipse.swt.events.PaintEvent; import org.eclipse.swt.events.PaintListener; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Canvas; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class DrawPolygonSWT {

 public static void main(String[] args) {
   Display display = new Display();
   Shell shell = new Shell(display);
   shell.setText("Canvas Example");
   shell.setLayout(new FillLayout());
   Canvas canvas = new Canvas(shell, SWT.NONE);
   canvas.addPaintListener(new PaintListener() {
     public void paintControl(PaintEvent e) {
       Canvas canvas = (Canvas) e.widget;
       int x = canvas.getBounds().width;
       int y = canvas.getBounds().height;
        e.gc.setBackground(e.display.getSystemColor(SWT.COLOR_BLACK));
       // Create the points for drawing a triangle in the upper left
       int[] upper_left = { 0, 0, 200, 0, 0, 200};
       // Create the points for drawing a triangle in the lower right
       int[] lower_right = { x, y, x, y - 200, x - 200, y};
       // Draw the triangles
       e.gc.fillPolygon(upper_left);
       e.gc.fillPolygon(lower_right);      }
   });
   
   shell.open();
   while (!shell.isDisposed()) {
     if (!display.readAndDispatch()) {
       display.sleep();
     }
   }
   display.dispose();
 }

}</source>