Processing Sketch

explodingdots.pde

public class Shooter {
  float x;
  float y;
  color colour = color(random(0,255), random(0,255), random(0,255));
  float xspeed = random(-10,10);
  float yspeed = random(-10,10);

  Shooter(float x, float y) {
    this.x = x;
    this.y = y;
  }

  void updatePosition() {
    if ((this.x + this.xspeed) > width){
      this.x = this.x + this.xspeed - width;
    } else if ((this.x + this.xspeed) < 0){
      this.x = this.x + this.xspeed + width;
    } else {
      this.x += this.xspeed;
    }
    if ((this.y + this.yspeed) > height){
      this.y = this.y + this.yspeed - height;
    } else if ((this.y + this.yspeed) < 0){
      this.y = this.y + this.yspeed + height;
    } else {
      this.y += this.yspeed;
    }
  }

  void displayShooter(){
    fill(this.colour);
    ellipse(this.x, this.y, 5, 5);
  }
}

ArrayList<Shooter> objects = new ArrayList<Shooter>();

void setup(){
  size(800,600);
  background(255);
}

void draw(){
  background(255);
  noStroke();
  objects.add(new Shooter(mouseX, mouseY));
  for(int i = 0; i < objects.size(); i++){
    objects.get(i).displayShooter();
    objects.get(i).updatePosition();
  }
  // Manages how many objects are on the screen to avoid lag
  if (objects.size() > 60){
    objects.remove(0);
  }
}