Java Tutorial/SWT 2D Graphics/Polygon

Drawing Polygons

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();
  }
}