// Random Walker (No Vectors)
// Daniel Shiffman <http://www.shiffman.net>
// The Nature of Code, Spring 2009

// A random walker class!

class Walker {
  PVector loc;
  float objW=10;
  float objH=10;
  int mouseTrack = 0;
  int[] prevMo = new int[4];
  float tx = 0;
  float ty = 0;
  Walker() {
    loc = new PVector(width,0);
    loc.x = random(0,width);
    loc.y= random(0,-height);
  }

  void render() {
    stroke(3);
    fill(255);
    ellipse(loc.x,loc.y,objW,objH);
  }

  // Randomly move up, down, left, right, or stay in one place
  void walk() {

    float velx = 3*(noise(tx) - 0.5);
    float vely = 2*(noise(ty));

    ////get mouse input
    prevMo[mouseTrack] = mouseX;
    mouseTrack++;
    prevMo[mouseTrack] = mouseY;
    mouseTrack++;
    if (mouseTrack == 4){
      mouseTrack = 0; 
    }

    int xAxis = prevMo[2]-prevMo[0];
    int yAxis = prevMo[3]-prevMo[1];


    if(yAxis != 0&&xAxis != 0){
      if(abs(loc.y-mouseY)<30&&abs(loc.x-mouseX)<30){
        if(loc.y<mouseY&&loc.x>mouseX){
          vely -= abs((mouseY-vely))/50.0;
          velx += abs((mouseX-velx))/50.0;

        }
      }
    }


    if(yAxis != 0&&xAxis != 0){
      if(abs(loc.y-mouseY)<30&&abs(loc.x-mouseX)<30){
        if(loc.y>mouseY&&loc.x<mouseX){

          vely += abs((mouseY-vely))/50.0;
          velx -= abs((mouseX-velx))/50.0;
        }
      }
    }

    if(xAxis != 0){
      if(abs(loc.x-mouseX)<30){
        if(loc.y==mouseY&&loc.x<mouseX){
          println("3");
          velx -= abs((mouseX-velx))/50.0;
        }
      }
    }
    if(yAxis != 0){
      if(abs(loc.y-mouseY)<30&&abs(loc.x-mouseX)<30){
        if(loc.y<mouseY&&loc.x==mouseX){
          println("4");
          vely -= abs((mouseY-vely))/50.0;
        }
      }
    }



    if(yAxis != 0&&xAxis != 0){
      if(abs(loc.y-mouseY)<30&&abs(loc.x-mouseX)<30){
        if(loc.y>mouseY&&loc.x>mouseX){

          vely += abs((mouseY-vely))/50.0;
          velx += abs((mouseX-velx))/50.0;
        }
      }
    }
    if(xAxis != 0){
      if(abs(loc.y-mouseY)<30&&abs(loc.x-mouseX)<30){
        if(loc.y==mouseY&&loc.x>mouseX){
          println("6");
          velx += abs((mouseX-velx))/50.0;
        }
      }
    }
    if(yAxis != 0){
      if(abs(loc.y-mouseY)<30&&abs(loc.x-mouseX)<30){
        if(loc.y>mouseY&&loc.x==mouseX){
          println("7");
          vely += abs((mouseY-vely))/50.0;
        }
      }
    }


    PVector vel = new PVector(velx,vely);
    loc.add(vel);


    // Stay on the screen
    loc.x = constrain(loc.x,0,width-1);
    // loc.y = constrain(loc.y,0,height-1);
    if(loc.y>(height+objH)){
      loc.y = 0-objH;
      loc.x = random(0,width);
    } 


    tx += 0.02;
    ty += 0.01;

  }
}