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мерс

import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.KeyEvent;

public class Sprite {

private double x = 100, y = 200;
private int radius = 50;
private boolean visible = true;
private Color color;
private double red = 0;
private double speed = 0.1;
private double speed1 = 0.1;
private double speedX = speed, speedY = -speed;

public Sprite (int x, int y) {
this.x = x;
this.y = y;
color = new Color(0, 0, 0);
}

public void up () {
speedY = -speed;
}
public void down () {
speedY = speed;
}

public void right() {
speedX = speed;
}

public void left() {
speedX = -speed;
}

public void hide () {
visible = false;

}

public void show () {
visible = true;
}

public void update () {
x = x + speedX;
y = y + speedY;
//red = red + 0.01;

if (red > 255) {
speed1=-speed;
//hide();
}
else if (red <0 ) {
speed1=speed;
}

red = red + speed1;

if (x > 500) {
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left ();
}
if (y > 500) {
up();
}
if (x < 0) {
right();
}
if (y < 0) {
down();
}



color = new Color ((int)red, 0, 0);

}

public void paint (Graphics g) {
if (visible) {
g.setColor( color );
g.fillOval((int)x, (int)y, radius * 2, radius * 2);
}
}

}