/*
  Peter de Jong 01

  Created with Processing 68 alpha on Octover 13 , 2004
  http://www.harukit.com/
  
  inspiration
       http://www.wmute.org
       http://www.complexification.net
       http://astronomy.swin.edu.au/~pbourke/
*/


int dNum = 10000;
float sens=0.01;
float a0 =random(-2.5,2.5)*sens;
float a1 =random(-2.5,2.5)*sens;
float a2 =random(-2.5,2.5)*sens;
float a3 =random(-2.5,2.5)*sens;
float scal = 200;

Dot[] dot = new Dot[dNum];

void setup(){
  size(640,480);
  background(255);
  noFill();
  for(int i=0;i<dNum;i++){
    dot[i]=new Dot(a0,a1,a2,a3);
  }
}

void loop(){
  translate(width/2,height/2);
  for(int i=0;i<dNum;i++){
    dot[i].update();
  }
}

void mouseReleased(){
  background(255);
  a0 =random(-2.5,2.5)*sens;
  a1 =random(-2.5,2.5)*sens;
  a2 =random(-2.5,2.5)*sens;
  a3 =random(-2.5,2.5)*sens;
  for(int i=0;i<dNum;i++){
    dot[i]=new Dot(a0,a1,a2,a3);
  }
}

class Dot {
  float nx,ny,ox,oy;
  color col;
  Dot(float a0,float a1,float a2,float a3){
    ox=random(-width/2,width/2);
    oy=random(-height/2,height/2);
    col = color(50,30,0,10);
  }
  void update(){
    nx=(sin(a0*oy)-cos(a1*ox))*scal;
    ny=(sin(a2*ox)-cos(a3*oy))*scal;
    stroke(col);
    line(nx,ny,nx,ny);
    ox=nx;
    oy=ny;
  }
}