class Point {
  float mx, my;
  Point(float imx, float imy) {
    mx = imx;
    my = imy;
  }
  float squaredDistanceTo(Point p) {
    return pow(p.mx - this.mx,2.0) + pow(p.my - this.my,2.0);
  }
}

Vector centers;
float radius = 4.0;


void caret(Point p, float len)
{
  float angle1 = random(0,TWO_PI);
  float angle2 = angle1 + random(radians(40),radians(80));
  
  line(p.mx, p.my, p.mx+len*cos(angle1), p.my+len*sin(angle1));
  line(p.mx, p.my, p.mx+len*cos(angle2), p.my+len*sin(angle2));
}

void setup()
{
  size(320,240);
  smooth(); 
  

}

void draw()
{
centers = new Vector();
  int retries;
do {
    boolean acceptable;
    Point p;
    
    retries = 0;
    do {
      p = new Point(random(0.0,width),random(0.0,height));
      acceptable = true;
      for (Iterator iter = centers.iterator(); iter.hasNext();) {
        if (p.squaredDistanceTo((Point)iter.next()) < radius*radius*4.2) {
           retries++;
           acceptable = false;
           break;
        }
      }
    } while (!acceptable && retries < 1000);
    if (acceptable) {
      centers.add(p);
      retries = 0;
    }
  } while (retries == 0);
   background(255);
 
  for (Iterator iter = centers.iterator(); iter.hasNext();) {
    caret((Point)iter.next(),radius);
  }
}