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PurpleRain.java
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PurpleRain.java
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import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.Line2D;
import java.util.LinkedList;
import java.util.Random;
public class PurpleRain extends JPanel implements ActionListener {
static final int WIDTH = 640, HEIGHT = 480;
static final float MAX_VEL = 5.0f, MIN_VEL = 1.0f;
static class Rain {
int x, y1, y2;
float vel;
Rain() {
Random rand = new Random();
x = rand.nextInt(WIDTH);
y1 = rand.nextInt(120) - 200;
y2 = y1 + 20 + rand.nextInt(30);
vel = (y2 - y1) / 50.0f * (MAX_VEL - MIN_VEL) + MIN_VEL;
}
}
static LinkedList<Rain> rain = new LinkedList<>();
Timer t = new Timer(5, this);
public static void main(String[] args) {
JFrame jf = new JFrame();
PurpleRain jp = new PurpleRain();
rain.add(new Rain());
jf.setSize(WIDTH, HEIGHT);
jf.setLayout(new BorderLayout());
jf.setTitle("Purple Rain");
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setVisible(true);
jf.add(jp);
}
@Override
protected void paintComponent(Graphics g) {
t.start();
g.setColor(Color.BLACK);
g.fillRect(0, 0, WIDTH, HEIGHT);
for (Rain r : rain) {
g.setColor(new Color(200 + (int)(r.vel / MAX_VEL * 55), 0,
200 + (int)(r.vel / MAX_VEL * 55)));
Graphics2D g2 = (Graphics2D) g;
g2.setStroke(new BasicStroke(r.vel / 2));
g2.draw(new Line2D.Float(r.x, r.y1, r.x, r.y2));
}
}
@Override
public void actionPerformed(ActionEvent actionEvent) {
rain.add(new Rain());
rain.add(new Rain());
for (Rain r : rain) {
r.y1 += r.vel;
r.y2 += r.vel;
}
for (int i = 0; i < rain.size(); i++) {
if (rain.get(i).y1 > 500) rain.remove(i);
}
repaint();
}
}