/**
 * Labirinto (v2.1)
 * by elzlarenna (2013/Feb)
 * mod GoToLoop
 *
 * http://forum.processing.org/topic/how-to-stop-a-ball-on-a-colour
 */

PImage img;

short  x, y;
byte sx, sy;

final static byte sp = 2, sz = 8;

final static color colWall   = #050304;
final static color colPlayer = #A0FF00;

void setup() {
  size(800, 600);
  frameRate(50);
  ellipseMode(RADIUS);
  fill(colPlayer);

  img = loadImage("Labirinto.jpg");

  x = 50;
  y = (short) (height - 50);
}

void draw() {

  background(img);

  if ( get(x + sx, y + sy) > colWall ) {
    x += sx;
    y += sy;
  }

  ellipse(x, y, sz, sz);
}

void keyPressed() {
  final int k = keyCode;

  if (     k == LEFT  |  k == 'A')    sx = -sp;
  else if (k == RIGHT |  k == 'D')    sx = sp;
  else if (k == UP    |  k == 'W')    sy = -sp;
  else if (k == DOWN  |  k == 'S')    sy = sp;
}

void keyReleased() {
  final int k = keyCode;

  if ( k == LEFT    |  k == 'A'  &&  sx < 0 
    || k == RIGHT   |  k == 'D'  &&  sx > 0 )    sx = 0;

  else if ( k == UP |  k == 'W'  &&  sy < 0 
    || k == DOWN    |  k == 'S'  &&  sy > 0 )    sy = 0;
}