import java.awt.BasicStroke;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Area;
import java.awt.geom.Ellipse2D;
import java.awt.geom.GeneralPath;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class AreaSubtracting extends JPanel {
DrawingCanvas canvas;
public AreaSubtracting() {
canvas = new DrawingCanvas();
add(canvas);
canvas.area1 = new Area(canvas.gp);
canvas.area1.subtract(canvas.area2);
canvas.repaint();
}
public static void main(String arg[]) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add("Center", new AreaSubtracting());
frame.pack();
frame.setSize(new Dimension(400, 300));
frame.setVisible(true);
}
class DrawingCanvas extends Canvas {
GeneralPath gp;
Ellipse2D ellipse;
Area area1, area2;
public DrawingCanvas() {
setBackground(Color.white);
setSize(350, 250); // width and height of canvas
int w = getWidth();
int h = getHeight();
gp = new GeneralPath();
gp.moveTo(w / 8, h / 2);
gp.lineTo(w / 2, h / 4);
gp.lineTo(7 * w / 8, h / 2);
gp.lineTo(w / 2, 3 * h / 4);
gp.closePath();
area1 = new Area(gp); // General path area object
ellipse = new Ellipse2D.Double(w / 4, h / 4, w / 2, h / 2);
area2 = new Area(ellipse); // Ellipse area object
}
public void paint(Graphics g) {
Graphics2D g2D = (Graphics2D) g;
g2D.setStroke(new BasicStroke(2.0f));
g2D.draw(area1);
g2D.draw(area2);
}
}
}