DrawPolygonSWT.java Source code

Introduction

Here is the source code for DrawPolygonSWT.java

Source

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();
    }
}