snake.js

class Snake{

  constructor(){

    this.body =[];
    this.body[0]=createVector(floor(w/2),floor(h/2));
    this.xdir=1;
    this.ydir=0;
    this.len=0;
  }
  setDir(x,y){
    this.xdir=x;
    this.ydir=y;
  }
  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);

  }
  returnLength(){
    return this.len;
  }
  grow(){
    let head = this.body[this.body.length-1].copy();
    this.len++;
    this.body.push(head);
  }
  endGame(){
    let x = this.body[this.body.length-1].x;
      let y = this.body[this.body.length-1].y;
      if(x > w-1 || x < 0 || y > h-1 || y < 0) {
         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;
    }
  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;
  }

  show(){
    for(let i=0;i<this.body.length;i++){
    fill(0);
    noStroke();
    rect(this.body[i].x,this.body[i].y,1,1);
  }
  }
}