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;
    }
  }
}