Modify ClipPoly.java (Original program here: http://pastebin.com/pjFxmiEm ), so

Question

Modify ClipPoly.java (Original program here: http://pastebin.com/pjFxmiEm), so that as a result of clipping, it displays the

polygon line segments outside of the clip rectangle as dotted lines, those inside

the clip rectangle as solid lines, and then the clipped polygon (resulting polygon

is filled with blue color).

Extend the above modified polygon clipping program for

clipping regions other than rectangles. The clipping region should be a polygon

within a drawing rectangle of 500 x 300, and should be determined by the user's

mouse clicking in the same way as in this code: http://pastebin.com/sfij1MHq

Explanation / Answer

import java.awt.BorderLayout;
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.Rectangle2D;

import javax.swing.JFrame;
import javax.swing.JPanel;


public class Test extends JPanel {

    public static void main(String[] args) {
        JFrame f = new JFrame();
        Test t = new Test();
        f.getContentPane().setLayout(new BorderLayout());
        f.getContentPane().add(t,BorderLayout.CENTER);
        f.pack();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);
    }

    public Test() {
        setPreferredSize(new Dimension(300, 300));
    }

    public void paintComponent(Graphics g) {
        Graphics2D g2 = (Graphics2D)g.create();
        Rectangle2D rectangleNotToDrawIn = new Rectangle2D.Double(100, 100, 20, 30);
        Area outside = calculateRectOutside(rectangleNotToDrawIn);
        g2.setPaint(Color.white);
        g2.fillRect(0, 0, getWidth(), getHeight());
        g2.setPaint(Color.black);
        g2.setClip(outside);
        g2.drawLine(0, 0, getWidth(), getHeight());

    }


    private Area calculateRectOutside(Rectangle2D r) {
        Area outside = new Area(new Rectangle2D.Double(0, 0, getWidth(), getHeight()));
        outside.subtract(new Area(r));
        return outside;
    }

}

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