class Snake {

    constructor(){

        this.body = [];

        this.body[0] = createVector(0,0);

        this.xdir = 1;

        this.ydir = 0;

    }

    update(){

    let head = this.body[this.body.length-1].copy();

    this.body.shift();

        head.x += this.xdir;

        head.y += this.ydir;

    this.body.push(head);

​

    }

    display(){

     for(var i = 0; i< this.body.length;i++){

                rect(this.body[i].x,this.body[i].y,1,1);

        }

    }

  setDir(x,y){

    this.xdir = x;

    this.ydir = y;

  }

  grow(){

    let head = this.body[this.body.length-1].copy();

    this.body.push(head);

  }

    eat(pos){

    let x = this.body[this.body.length-1].x;

    let y = this.body[this.body.length-1].y;

    if(x == pos.x && y == pos.y) {

      this.grow();

      return true;

    }

    return false;

  }

  endGame(){

  let x = this.body[this.body.length-1].x;

  let y = this.body[this.body.length-1].y

  if(x > wh || x < 0 || y < 0 || y > wh){

    return true;

  }

    for(let i = 0; i < this.body.length-1; i++){

        let part = this.body[i];

        if(part.x == x && part.y == y){

                    return true;

        }

       }

  return false

  }

}