int n = 500; // number of rockets
int m = 30;  // number of barriers

Rocket[] r = new Rocket[n]; // rockets
Barrier[] b = new Barrier[m];

void setup () {
  size(500, 350);
  
  updateIt();  
  framerate(60);
//  background(255);
  stroke(0, 0, 0, 10);
  smooth();
}


void draw() {
  for(int i = 0; i < n; i++) {
    r[i].update();
    r[i].show();
  }
}

void mousePressed() {
  updateIt();
}

void updateIt() {
  for(int i =0; i < n; i++) {
    r[i] = new Rocket();
  }
  background(255);
  for(int i = 0; i < m; i++) {
     b[i] = new Barrier();
//     noStroke();
//     fill(200, 0, 0);
//     rect(b[i].x - 1, b[i].y - 1, 3, 3);
  }
  stroke(random(200), random(200), random(200), 10);
//   stroke(0, 0, 0, 10);
}

class Rocket {
  float x, y, angle;
  
  Rocket() {
    x = random(-50, 0);
    y = random(-50, 0);
    angle = random(360);
  }
  
  void update() {
    float minD = 10000, d, dx, dy, a;
    int minDid = -1;

    x += cos(radians(angle));
    y += sin(radians(angle));

            
    if(angle > 360) angle = 0;
    if(angle < 0) angle = 360;
    if(x > width + 50) x = -50;
    if(x < -50) x = width + 50;
    if(y > height + 50) y = -50;
    if(y < -50) y = height + 50;
        
    // find the closer one
    for(int i = 0; i < m; i++) {
      dx = this.x - b[i].x;
      dy = (this.y - b[i].y);
      a = degrees(atan2(dy, dx)) + 180;
//      float kokot = a + 180;
//      println(angle + " " + kokot);
      if(abs(angle - a) < 30 || abs(angle - a) > 330) {
        d = sqrt(dx*dx + dy*dy);
        if(minD > d) {
          minD = d;
          minDid = i;
        }
      }
    }
    if(minDid == - 1) return;
    if(minD < 80) {
      a = degrees(atan2((this.y - b[minDid].y), this.x - b[minDid].x)) + 180;
      if(angle - a > 0) {
        if(abs(angle - a) < 30) {
          angle++;
        } else {
          angle--;
        }
      }
      if(angle - a <= 0) {
        if(abs(angle - a) < 30) {
          angle--;
        } else {
          angle++;
        }
      }
      return;
    }
    if((int)random(50) == 0) {
      if((int)random(1) == 0) {
        angle++;
      } else {
        angle--;
      }
    }
    //angle += 0.0001;
  }
  
  void show() {
    point(x, y);
  }
}

class Barrier {
  float x, y;
  
  Barrier() {
    x = random(width);
    y = random(height);   
  }
}