/** 
 * Some experiments with Particle Systems. 
 * Nick Selvaggio
 * 12.15.09
 **/

//a collection of palettes. I am using http://www.colourlovers.com/ 
color[] blues = {#00C5CC, #7CFFF4, #74E4FF, #BEFFEF, #A1F1FF}; 
color[] light = {#D8EBE0, #BADEDD, #C9BAA1}; 
color[] smlBlue = {#00C5CC}; 
color[] blacks = {#000000}; 
color[] pie_crust = {#310015, #1C0B12, #C4B482, #0D0207, #17070E}; 
color[] nothing_changes = {#70074B, #110240, #89868A, #FFD000}; 
color[] classic_holiday = {#5F0606, #DA1717, #FFF5D6, #035F0B, #013A06}; 

color[] palette = classic_holiday; 

ArrayList forces;

Emitter e; 

int t; 

void setup() { 
  size(500,500, P2D); 
 
  background(255); 
  
  t=0;       //start time at 0. 
  
  createUniverse(); 
}

//------------------------------------
void createUniverse() {
   createForces(); 
   createEmitter(); 
}

//------------------------------------
//Here is where we can add environmental forces global to the entire "universe". 
void createForces() {
    forces = new ArrayList();  
    
    //forces.add(new PVector(0, 9.8));    //gravity.
    //forces.add(new PVector(2, -3.0));   //random. left to right wind. with a ground blow. 
}

//------------------------------------

void draw() { 
  fill(255, 10); 
  rect(0, 0, width, height); 
  //background(0); 
  
  e.step();       //steping with it... 
  
  //recreate the emitter at some arbirary time and then reset. 
  if(t > 175) { 
     createEmitter(); 
     t = 0;    
  } 
  
  t++; 
}


//shot out to jared tarbell... my favorite artist! 
color someColor() { 
   return palette[int(random(palette.length))];  
}

//------------------------------------

void mousePressed() { 
   //saveFrame("ParticleLab-####.png"); 
   //e.emit();
   fill(255, 100); 
   rect(0, 0, width, height); 
   
   //reset time. 
   t = 0; 
   
   createEmitter(); 
}

void createEmitter() { 
   //instantiate the emitter. 
   e = new Emitter(1000, new PVector(width/2, height/2));
}