ScalingOrigin13.java

package hw;

import java.awt.Graphics;
import javax.swing.JFrame;

public class ScalingOrigin13 extends JFrame {
	int xPoly[] = { 25, 45, 96, 110, 145, 35, 40 };
	int yPoly[] = { 25, 50, 36, 66, 75, 85, 40 };
	int i;

	ScalingOrigin13() {
		setTitle("Scaling on Origin: ");
		setSize(960, 960);
		setVisible(true);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}

	public void paint(Graphics g) {
		g.translate(100, 100);
		g.drawPolygon(xPoly, yPoly, xPoly.length);

		scaleAt(2, 2);
	}

	public void scaleAt(int Sx, int Sy) {
		for (i = 0; i < xPoly.length; i++) {
			xPoly[i] = xPoly[i] * Sx;
			yPoly[i] = yPoly[i] * Sy;
		}

		Graphics g = this.getGraphics();
		g.translate(100, 100);
		g.drawPolygon(xPoly, yPoly, xPoly.length);
	}

	public static void main(String[] args) {
		javax.swing.SwingUtilities.invokeLater(new Runnable() {
			public void run() {
				new ScalingOrigin13();
			}
		});
	}
}