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/* Listing3409.java */
import java.awt.*;
import java.awt.event.*;
import java.util.*;
class ColorRectangle
extends Rectangle
{
public Color color;
}
public class Listing3409
extends Frame
implements Runnable
{
//Konstanten
private static final int SIZERECT = 7;
private static final int SLEEP = 40;
private static final int NUMELEMENTS = 20;
private static final Color BGCOLOR = Color.lightGray;
//Instanzvariablen
private Thread th;
private Vector snake;
private int dx;
private int dy;
public static void main(String[] args)
{
Listing3409 frame = new Listing3409();
frame.setSize(200,150);
frame.setVisible(true);
frame.startAnimation();
}
public Listing3409()
{
super("Animierte Schlange");
setBackground(BGCOLOR);
addWindowListener(new WindowClosingAdapter(true));
snake = new Vector();
}
public void startAnimation()
{
th = new Thread(this);
th.start();
}
public void run()
{
//Schlange konstruieren
ColorRectangle cr;
int x = 100;
int y = 100;
for (int i=0; i < NUMELEMENTS; ++i) {
cr = new ColorRectangle();
cr.x = x;
cr.y = y;
cr.width = SIZERECT;
cr.height = SIZERECT;
x += SIZERECT;
cr.color = new Color(
i*(256/NUMELEMENTS),
0,
240-i*(256/NUMELEMENTS)
);
snake.addElement(cr);
}
//Vorzugsrichtung festlegen
dx = -1;
dy = -1;
//Schlange laufen lassen
while (true) {
repaint();
try {
Thread.sleep(SLEEP);
} catch (InterruptedException e){
//nichts
}
moveSnake();
}
}
public void moveSnake()
{
Dimension size = getSize();
int sizex = size.width-getInsets().left-getInsets().right;
int sizey = size.height-getInsets().top-getInsets().bottom;
ColorRectangle cr = (ColorRectangle)snake.firstElement();
boolean lBorder = false;
int xalt, yalt;
int xtmp, ytmp;
//Kopf der Schlange neu berechnen
if (cr.x <= 1) {
dx = 1;
lBorder = true;
}
if (cr.x + cr.width >= sizex) {
dx = -1;
lBorder = true;
}
if (cr.y <= 1) {
dy = 1;
lBorder = true;
}
if (cr.y + cr.height >= sizey) {
dy = -1;
lBorder = true;
}
if (! lBorder) {
if (rand(10) == 0) {
if (rand(2) == 0) {
switch (rand(5)) {
case 0: case 1:
dx = -1;
break;
case 2:
dx = 0;
break;
case 3: case 4:
dx = 1;
break;
}
} else {
switch (rand(5)) {
case 0: case 1:
dy = -1;
break;
case 2:
dy = 0;
break;
case 3: case 4:
dy = 1;
break;
}
}
}
}
xalt = cr.x + SIZERECT * dx;
yalt = cr.y + SIZERECT * dy;
//Rest der Schlange hinterherziehen
Enumeration e = snake.elements();
while (e.hasMoreElements()) {
cr = (ColorRectangle)e.nextElement();
xtmp = cr.x;
ytmp = cr.y;
cr.x = xalt;
cr.y = yalt;
xalt = xtmp;
yalt = ytmp;
}
}
public void paint(Graphics g)
{
ColorRectangle cr;
Enumeration e = snake.elements();
int inleft = getInsets().left;
int intop = getInsets().top;
while (e.hasMoreElements()) {
cr = (ColorRectangle)e.nextElement();
g.setColor(cr.color);
g.fillRect(cr.x+inleft,cr.y+intop,cr.width,cr.height);
}
}
private int rand(int limit)
{
return (int)(Math.random() * limit);
}
}
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