Source Code
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import javax.swing.JFrame;
import java.awt.Color;
import java.awt.image.BufferedImage;
import java.awt.Graphics2D;
import java.awt.Toolkit;
import java.awt.Point;
public class Matrix extends JFrame {
private static Graphics2D g;
private BufferedImage frame;
private final int cx = Toolkit.getDefaultToolkit().getScreenSize().width, cy = Toolkit.getDefaultToolkit().getScreenSize().height;
public static void main(String[] args) {
Matrix m = new Matrix();
}
public Matrix() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setExtendedState(JFrame.MAXIMIZED_BOTH);
setUndecorated(true);
getContentPane().setBackground(Color.BLACK);
getContentPane().setCursor(Toolkit.getDefaultToolkit().createCustomCursor(new BufferedImage(16, 16, BufferedImage.TYPE_INT_ARGB), new Point(0, 0), ""));
setVisible(true);
frame = new BufferedImage(cx, cy, BufferedImage.TYPE_INT_RGB); // TYPE_3BYTE_BGR is slow
g = (Graphics2D)frame.getGraphics();
run();
}
public void run() {
double st;
int th=14, tw=12, br, n=-255, f=30; // text height and width in pixels, current sign brightness, rain density, number of randomly flipped signs per frame
char[][] m = new char[(cx-tw)/tw+1][(cy-th)/th+1];
float[] b = new float[(cx-tw)/tw+1], s = new float[(cx-tw)/tw+1];
for(int x=0; x<m.length; x++) {
b[x] = (float)(Math.random()*(255-n)+n);
s[x] = (float)(Math.random()*3+1);
for(int y=0; y<m[0].length; y++) m[x][y] = (char)(Math.random()*(19893-13318)+13318);
}
while(true) {
st = time();
for(int x=0; x<m.length; x++) {
b[x] -= s[x];
if(b[x] < n) b[x] = 255;
for(int y=0; y<m[0].length; y++) {
br = (int)b[x] + 3*y;
if(br > 255) br -= (255-n);
if(br>=253&&br<=255) {
m[x][y] = (char)(Math.random()*(19893-13318)+13318);
g.setColor(new Color(200, 255, 200));
} else g.setColor(new Color(0, br>0?br:0, 0));
g.drawString("" + m[x][y], x*tw, (y+1)*th);
}
}
for(int i=0; i<f; i++) m[(int)(Math.random()*m.length)][(int)(Math.random()*m[0].length)] = (char)(Math.random()*(19893-13318)+13318);
this.getGraphics().drawImage(frame, 0, 0, null);
g.clearRect(0, 0, cx, cy);
pause(1.0/60.0-time()+st);
}
}
public double time() {
return System.nanoTime()*1E-9;
}
public void pause(double s) {
if(s > 0) {
try {
Thread.sleep((int)(s*1E3));
} catch(Exception e) {}
}
}
}]]>
