//---------------------------------
// bretzel orgie (processing)
// 
// date: 	2006.03.17
// author:	erational.org
// version: 0.1
//---------------------------------

// parameters
//-----------------------------------
int item = 0;		// nb elements
int d = 4;		// drawing speed
int state = 0;	        // state: 0: nothing 1: growing
int px = 200;		// pointer current x
int py = 200;		// pointer current y
int dx = -1;		// direction x
int dy = 0;		// direction y
int entropy = 4; //105;	// entropy level 0: very unstable 100000: stable
int r;                  // current color: red
int g;                  // current color: green
int b;                  // current color: blue



// init  GUI
//-----------------------------------
int px2 = px;
int py2 = py;

void setup() {
  size(800,1000);
  background(90);  
  rand_color();  
}

// function
//-----------------------------------
boolean new_event() {
  if ((int)random(entropy)==0) return true;
	                  else return false;
}

void change_direction() {
  switch ((int)random(4))  {
    case 0:	dx=0; dy=1; break;
    case 1:	dx=1; dy=0; break;
    case 2:	dx=0; dy=-1; break;
    case 3:	dx=-1; dy=0; break;
  }	
}

void rand_color() {
  r = (int)random(255);
  g = (int)random(255);
  b = (int)random(255);
}


// main
//-----------------------------------
void draw() {
  if (state==0) {	// state: nothing
      // create new element
      item++;      
      px2 = px;
      py2 = py;	 
      state = 1; 
  } else if (state==1) { // state: growing
      // growing
      px2 += dx * d ;
      py2 += dy * d;
      stroke(r, g, b, 77 +random(153));
      line(px,py,px2,py2);
      // change state ? 
      if (new_event()) {
	state = 0;
	px = px2;
	py = py2;
	if (px<0||px>800) px = (int)random(800);
	if (py<0||py>800) py = (int)random(800);
	change_direction();
	rand_color();
      } 
  }
	
}