Data commit

Task/Langtons-ant/Java/langtons-ant.java

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+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){
+			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;
+				}
+			}
+			plane[antY][antX] = !plane[antY][antX];
+			antX += xChange;
+			antY += yChange;
+		}
+		return plane;
+	}
+}