float laserSpeed = 10;
int health = 100;


class PEW {
  float x, y, sx, sy;
  PEW (float x, float y, float x2, float y2) {
    this.x = x;
    this.y = y;


    float deltax = x2 - x;
    float deltay = y2 - y;

    float hyp = dist (x2, y2, x, y);

    this.sx = laserSpeed * deltax / hyp;
    this.sy = laserSpeed * deltay / hyp;
  }


  void process() {
    this.x += this.sx;
    this.y += this.sy;

    this.sy += 0.2;


    stroke(0, 255, 0);
    line(this.x, this.y, this.x + this.sx, this.y + this.sy);
  }
}



ArrayList<PEW> lasers = new ArrayList<PEW>();



void setup() {
  size(600, 600);
}


void draw() {
  fill(0); 
  rect(0, 0, 600, 600);


  for (int i=0; i < lasers.size(); i++) lasers.get(i).process();

  for (int i=0; i < lasers.size(); i++) {
    if (lasers.get(i).x < 0 || lasers.get(i).x > 600 || lasers.get(i).y < 0 || lasers.get(i).y > 600) {
      //kill the laser 
      lasers.remove(i);
      i--;
    } else if (dist(lasers.get(i).x, lasers.get(i).y, mouseX, mouseY) < 50) {
      //kill the laser, hit the player
      lasers.remove(i);
      i--;

      health--;
    }
  }


  if (random(10) > 8) {
    for (int i=0; i < 5; i++) lasers.add(new PEW(100 + i * 100, 500, mouseX, mouseY));
  }
  
  
  
  fill(255);
  text("Health : " + health, 100,100);
}


void mousePressed() {
  lasers.add(new PEW(300, 500, mouseX, mouseY));
}