int iterations=0; 
int depth; 
color WalkerColor; 
RandomWalker2d[] myWalkers= new RandomWalker2d[iterations]; 
//RandomWalker3d[] myWalkers= new RandomWalker3d[iterations]; 
 
void setup(){ 
  colorMode(RGB, 255,255,255,1024); 
  size(720,486,P3D); 
  //smooth(); 
  background(0); 
  depth=(int)sqrt(width*height); 
  for(int i=0;i<iterations;i++){ 
    WalkerColor=color(100,100+random(155),100+random(155),200); 
    myWalkers[i]=new RandomWalker2d(width/2,height/2,(int)random(5)+1,WalkerColor); 
//    myWalkers[i]=new RandomWalker3d(width/2 ,height/2 ,depth/2 ,(int)random(2)+1, WalkerColor); 
 
  } 
} 
 
void draw(){ 
  //background(0); 
   
  //float theta=mouseX*TWO_PI/width; 
  //float phi=mouseY*TWO_PI/height; 
 
  //camera(sin(theta)*width+150, sin(phi)*width+150, cos(theta)*width+150, 
  //150.0, 150.0, 150.0,  
  //0.0, 1.0, 0.0); 
 
  for(int i=0;i<myWalkers.length;i++){ 
 
    myWalkers[i].walk(); 
  } 
  noStroke(); 
  fill(0,20); 
  rect(0,0,width,height); 
 
} 
 
void mouseDragged(){ 
 
  WalkerColor=color(100,100+random(155),100+random(155),200); 
  float distance=sqrt(sq(mouseX-pmouseX)+sq(mouseY-pmouseY)); 
   RandomWalker2d myWalker= new RandomWalker2d(mouseX,mouseY,(int)random(distance)+1,WalkerColor); 
  //RandomWalker3d myWalker= new RandomWalker3d(mouseX,mouseY,10,(int)random(distance)+1,WalkerColor); 
  myWalkers=(RandomWalker2d[])append(myWalkers,myWalker ); 
//  myWalkers=(RandomWalker3d[])append(myWalkers,myWalker ); 
} 
 
 
 
 
 
 
 
 
 
 

//randomWalker2d v0.1 
class RandomWalker2d { 
  float posX; 
  float posY; 
  float prevPosX; 
  float prevPosY; 
  float stepSize; 
  color walkerColor; 
 
  RandomWalker2d(float initPosX,float initPosY, float initStep, color initColor){ 
    prevPosX=posX=initPosX; 
    prevPosY=posY=initPosY; 
    stepSize=initStep; 
    walkerColor=initColor; 
  } 
 
  void walk(){ 
//    strokeWeight(0.5); 
    posX=(posX+random(-stepSize,stepSize)); 
    posY=(posY+random(-stepSize,stepSize)); 
    //posY+=constrain(abs((prevPosY-posY))*2,0,4); 
    //posY+=9.8; 
    if(posX<0||posX>width||posY<0||posY>height){ 
      posX=random(width); 
      posY=random(height); 
      prevPosX=posX; 
      prevPosY=posY; 
    } 
    else{ 
      stroke(walkerColor); 
      fill(walkerColor); 
      line(prevPosX,prevPosY,posX,posY); 
      //ellipse(posX,posY,3,3); 
      prevPosX=posX; 
      prevPosY=posY; 
    } 
  } 
} 

//randomWalker3d v0.1 
class RandomWalker3d { 
  float posX; 
  float posY; 
  float posZ; 
  float prevPosX; 
  float prevPosY; 
  float prevPosZ; 
  float stepSize; 
  float depth; 
  color walkerColor; 
 
  RandomWalker3d(float initPosX, float initPosY, float initPosZ, float initStep, color initColor){ 
    prevPosX=posX=initPosX; 
    prevPosY=posY=initPosY; 
    prevPosZ=posZ=initPosZ; 
    stepSize=initStep; 
    walkerColor=initColor; 
    depth=sqrt(height*width); 
  } 
 
  void walk(){ 
//    strokeWeight(0.5); 
    posX=(posX+random(-stepSize,stepSize)); 
    posY=(posY+random(-stepSize,stepSize)); 
    posZ=(posZ+random(-stepSize,stepSize)); 
    //posY+=constrain(abs((prevPosY-posY))*2,0,4); 
    //posY+=9.8; 
    if(posX<0||posX>width||posY<0||posY>height||posZ<-depth||posZ>depth){ 
      posX=random(width); 
      posY=random(height); 
      posZ=random(depth); 
      prevPosX=posX; 
      prevPosY=posY; 
    } 
    else{ 
      strokeWeight(2); 
      stroke(walkerColor); 
      fill(walkerColor); 
      line(prevPosX,prevPosY,prevPosZ,posX,posY,posZ); 
      //ellipse(posX,posY,3,3); 
      prevPosX=posX; 
      prevPosY=posY; 
      prevPosZ=posZ; 
    } 
  } 
}