My Blog

Star.Java

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.GeneralPath;

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

public class Star extends JPanel implements ActionListener {

double points[][] = {
{ 0, 85 }, { 75, 75 }, { 100, 10 }, { 125, 75 },
{ 200, 85 }, { 150, 125 }, { 160, 190 }, { 100, 150 },
{ 40, 190 }, { 50, 125 }, { 0, 85 }
};

Timer timer;

private double angle = 0;
private double scale = 1;
private double delta = 0.01;

public Star() {

timer = new Timer(10, this);
timer.start();
}

public void paint(Graphics g) {
super.paint(g);

int h = getHeight();
int w = getWidth();


Graphics2D g2d = (Graphics2D)g;

g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);

g2d.setRenderingHint(RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_QUALITY);

g2d.translate(w/2, h/2);
GeneralPath star = new GeneralPath();
star.moveTo(points[0][0], points[0][1]);

for (int k = 1; k < points.length; k++)
star.lineTo(points[k][0], points[k][1]);

star.closePath();
g2d.rotate(angle);
g2d.scale(scale, scale);

g2d.fill(star);
}

public static void main(String[] args) {

JFrame frame = new JFrame("Moving star By Mohammad Al amin");
frame.add(new Star());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(420, 250);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}


public void actionPerformed(ActionEvent e) {

if ( scale < 0.01 ) {
delta = -delta;
} else if (scale > 0.99) {
delta = -delta;
}

scale += delta;
angle += 0.01;

repaint();
}
}