void set up () { 
  
  // set up
  size (500, 500); 
}
void draw () {
  // next frame\
  scene ();
  action ();
}
void scene () {
  // sky, etc.
  background (100, 200, 255); // sky
  // +++ grass, house, etc.
}
void action () {
  // Hero - draw & move.
  jecaX= jecaX + 2;
  jecaX= jecaX % width;
  jecaY= jecaY + 1;
  jecaY= jecaY % height;