class Curver{
  Vec3D position;
  Vec3D prevPosition;
  Vec3D heading;
  Vec3D prevHeading;
  float step;
  float age;
  float turnPerStep;
  float newTurnPerStep;
  boolean overEdge;

  Curver(){
    position = new Vec3D(random(800f),random(800f),0f);
    prevPosition=new Vec3D(position);
    heading = new Vec3D(random(-1f,1f),random(-1f,1f),0f);

    heading.normalize();
    prevHeading = new Vec3D(heading);
    age=1.0f;
    step=1.0f;
    newTurnPerStep=turnPerStep=random(0.005f)*(random(100f)<50f?-1f:1f);
    overEdge=false;
  }


  void update(int[][] Grid){
    prevPosition.set(position);
    prevHeading.set(heading);
    overEdge=false;
    position.addSelf(heading.scale(step));
    if(position.x<0.01f*width){ position.x+=0.98f*width;overEdge=true;}
    if(position.x>=0.99f*width){ position.x-=0.98f*width;overEdge=true;}
    if(position.y<0.01f*height){ position.y+=0.98f*height;overEdge=true;}
    if(position.y>=0.99f*height){ position.y-=0.98f*height;overEdge=true;}

    age+=0.01f;
    Vec3D newHeading = new Vec3D(heading.x*cos(turnPerStep)-heading.y*sin(turnPerStep),heading.y*cos(turnPerStep)+heading.x*sin(turnPerStep),0f);
    heading.set(newHeading);
    if(random(100f)<1f) newTurnPerStep=random(0.005f)*(random(100f)<50f?-1f:1f);
    turnPerStep=0.99f*turnPerStep+0.01f*newTurnPerStep;



    if(grid[(int)(position.x+step*heading.x)][(int)(position.y+step*heading.y)]>0){
      position = new Vec3D(random(800f),random(800f),0f);
      heading = new Vec3D(random(-1f,1f),random(-1f,1f),0f);
      heading.normalize();
      prevPosition.set(position);
    prevHeading.set(heading);
    overEdge=false;
      
      age=1.0f;
      step=1.0f;
      newTurnPerStep=turnPerStep=random(0.005f)*(random(100f)<50f?-1f:1f);

    }
    grid[(int)position.x][(int)position.y]++;





  }

  void draw(color[][] colorGrid){
    noStroke();
    ellipse(position.x,position.y,age,age);
    stroke(colorGrid[(int)position.x][(int)position.y]);
    float randomL = random(age*10.0f);
    line(position.x/*-randomL*heading.y*/,position.y/*+randomL*heading.x*/,position.x+randomL*heading.y,position.y-randomL*heading.x);


    ellipse(position.x-randomL*heading.y,position.y+randomL*heading.x,0.5f*age,0.5f*age);
    //ellipse(position.x+randomL*heading.y,position.y-randomL*heading.x,0.5f*age,0.5f*age);
  }







}