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Langton's ant: Difference between revisions
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</pre>
=={{header|Java}}==
This implementation allows for sizes other than 100x100, marks the starting position with a green box (sometimes hard to see at smaller zoom levels and the box is smaller than the "pixels" so it doesn't cover up the color of the "pixel" it's in), and includes a "zoom factor" (<code>ZOOM</code>) in case the individual "pixels" are hard to see on your monitor.
<lang java>import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Langton extends JFrame{
private JPanel planePanel;
private static final int ZOOM = 4;
public Langton(final boolean[][] plane){
planePanel = new JPanel(){
@Override
public void paint(Graphics g) {
for(int y = 0; y < plane.length;y++){
for(int x = 0; x < plane[0].length;x++){
g.setColor(plane[y][x] ? Color.BLACK : Color.WHITE);
g.fillRect(x * ZOOM, y * ZOOM, ZOOM, ZOOM);
}
}
//mark the starting point
g.setColor(Color.GREEN);
g.fillRect(plane[0].length / 2 * ZOOM,
plane.length / 2 * ZOOM, ZOOM/2, ZOOM/2);
}
};
planePanel.setSize(plane[0].length - 1, plane.length - 1);
add(planePanel);
setSize(ZOOM * plane[0].length, ZOOM * plane.length + 30);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
public static void main(String[] args){
new Langton(runAnt(100, 100));
}
private static boolean[][] runAnt(int height, int width){
boolean[][] plane = new boolean[height][width];
int antX = width/2, antY = height/2;//start in the middle-ish
int xChange = 0, yChange = -1; //start moving up
while(antX < width && antY < height && antX >= 0 && antY >= 0){
plane[antY][antX] = !plane[antY][antX];
if(plane[antY][antX]){
//turn left
if(xChange == 0){ //if moving up or down
xChange = yChange;
yChange = 0;
}else{ //if moving left or right
yChange = -xChange;
xChange = 0;
}
}else{
//turn right
if(xChange == 0){ //if moving up or down
xChange = -yChange;
yChange = 0;
}else{ //if moving left or right
yChange = xChange;
xChange = 0;
}
}
antX += xChange;
antY += yChange;
}
return plane;
}
}</lang>
Output (click for a larger view):
[[Image:Langton Java.png|250px]]
=={{header|OCaml}}==
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