/// bouncing ball w/in box void setup()

float ballX=250, ballY=250;
float ballDX=3, ballDY=2;

void setup(){
 size(500,500);
 reset();
}

void reset() {
 
}  
  
void draw() {
  //// Next frame. ////
  scene();
  action();
}
void scene() {
  background(0);
  table();
}
void table() {
  rectMode(CORNERS);
  rect (25,25,475,475);
  fill(225,10,200);
  stroke(255);
  strokeWeight(5);
}

void action() {
  ball();
  collisions();
}

void ball() {
  // move & draw 
  ballX += ballDX;
  ballY += ballDY;
  ellipseMode(CENTER);  
  ellipse (ballX,ballY,10,10); 
}
void collisions() {
  //// Check crashing
  //++++++++++++
}