Ball.pde

Ball.pde

class Ball {
  float x;
  float y;
  int size;
  PVector v;
  color c;
  
  Ball(float x, float y, int size) {
    this.x = x;
    this.y = y;
    this.size = size;
    this.v = new PVector();
  }
  
  void draw() {
    pushStyle();
    fill(c);
    ellipse(x, y, size, size);
    popStyle();
  }
  
  void update() {
    
    
    
    if(millis() % 1 == 0) {

      this.x = x + v.x;
      this.y = y + v.y;
      
      // println(v);
      
      if(x > 1366 || x < 0) {
        v = new PVector(-v.x, v.y);
      }
      if(y > 768 || y < 0) {
        v = new PVector(v.x, -v.y);
      }
      
    }
  }
  
  void setColor(color c) {
    this.c = c;
  }
  
  void setV(PVector v) {
    this.v = v;
  }
  
  void stop() {
    this.v = new PVector(0, 0);
  }
  
}

usage

setup() {
  ball1 = new Ball(60, 60, 50);
  ball2 = new Ball(1300, 700, 50);
}

draw() {
  ball1.update();
  ball1.draw();
}

// set speed
ball1.setV(new PVector(0, 5));