//created=01 Jul 06
//description=Simple gravitational mouse follower.
//title=Mouse Follower I
//publish=true
 
Vector points;
 
void setup() 
{
  size(550, 550 ,P3D); 
  //noStroke();
  colorMode(RGB, 255, 255, 255, 100);
  rectMode(CENTER);
  points = new Vector();
  points.add(new point());
  background(255);
  //smooth();
  strokeWeight(1);
}
 
void draw() 
{   
  //background(0,0); 
 
  fill(255,5);
  noStroke();
  rect(width/2,height/2,width,height);
 
 
  if (points.size() < 50 && random(0,100) < 10){
    point tmp = new point();
    tmp.dx = random(-70,70);
    tmp.dy = random(-70,70);
    points.add(tmp);
    
 
  }
  stroke(0);
  point curr;
  for (int i =0; i < points.size(); i++){
    curr = (point)points.elementAt(i);
    curr.touch();
    //rect(curr.x, curr.y, 2, 2);
    line(curr.x,curr.y,curr.lx,curr.ly);
  }
 
  point a = (point)points.elementAt((int)random(0,points.size()));
  point b = (point)points.elementAt((int)random(0,points.size()));
 
  for (int i = 0; i < 10; i++){
    //rect(a.x,b.y,10,10);
    //line(a.x,a.y,b.x,b.y);
  }
 
  if ( random(0,100) < 10 && points.size() > 10){
    points.removeElementAt(0);
 
  }
 
}
 
class point{
  float x,y;
  float dx = 0,dy = 0;
  float dx2 = 0,dy2 = 0;
  float lx ,ly;
  float damping;
  float power;
  public point(){
    x = random (0,width);
    y = random (0,height);
    damping = random(.8,.95);
    power = random(10,50);
  }
 
  public void touch(){
    //move towards the mouse
    dx2 = (x - mouseX)/power;
    dy2 = (y - mouseY)/power;
 
 
    dx -= dx2;
    dy -= dy2; 
 
    dx *=damping;
    dy *=damping;
 
    lx = x;
    ly = y;
 
    x += dx;
    y += dy;    
 
 
  }
 
}