# Help!Snake growing algorithm not working

**URL:** <https://discourse.processing.org/t/help-snake-growing-algorithm-not-working/6886>\
**Category:** Coding Questions\
**Created:** [December 25, 2018, 8:16am UTC](https://discourse.processing.org/t/help-snake-growing-algorithm-not-working/6886 "2018-12-25T08:16:09Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![M.Abbas.Askari](https://avatars.discourse-cdn.com/v4/letter/m/f14d63/32.png) [@M.Abbas.Askari](https://discourse.processing.org/u/M.Abbas.Askari)\
**Post date:** [December 25, 2018, 8:16am UTC](https://discourse.processing.org/t/help-snake-growing-algorithm-not-working/6886/1 "2018-12-25T08:16:09Z")

</div>

Am a beggner & struggling to Code. Just created account to ask a qustion  
I AM STUCK!!!  
i think the problem is in the move() function in snake class  
the snake acts weird when i eat the food

```auto
/////CODE////// 

/////main.program/////(the class the contains setup & draw)

Snake snake = new Snake();
PVector food;
float w = 400/20;
float h = w;

void setup(){
  size(400, 400);
  foodLoc();
}

void draw(){
  scale (20);
  background(220);
  
  fill(255, 0, 0);
  rect(food.x, food.y, 1, 1);
  
  snake.show();
  snake.move();
  if (snake.eat(food)) {
    foodLoc();
    snake.grow();
  }
}

void keyPressed(){
  if (keyCode == RIGHT) snake.set(1, 0);
  else if (keyCode == UP) snake.set(0, -1);
  else if (keyCode == DOWN) snake.set(0, 1);
  else if (keyCode == LEFT) snake.set(-1, 0);
}

void foodLoc(){
  int x = floor( random(w) );
  int y = floor( random(h) );
  food = new PVector(x, y);
}

////Snake.class//////

class Snake{
  PVector body[] = new PVector[1];
  float xd;
  float yd;
  
  Snake(){
    for (int i = 0 ; i < body.length ; i++) body[i] = new PVector(0, 0);
  }
  
  void show(){
    noStroke();
    fill(0);
    for(int i = 0 ; i < body.length ; i++){
      rect(body[i].x, body[i].y, 1, 1);
    }
  }
  
  void grow(){
    body =(PVector[]) append(body, new PVector (0, 0));
  }
  
  void set(float x, float y){
    xd = x;
    yd = y;
  }
  
  boolean eat(PVector f){
    return ( body[0].equals(f) );
  }
  
  void move(){
    println(body.length);
    
    if(frameCount % 12 == 0){
      PVector head = body[body.length-1].copy();
      shift(body);
      head.x += xd;
      head.y += yd;
      body = (PVector[]) append(body, head);
    }
    
    println(body.length);    
  }
  
  void shift(PVector[] b){
  PVector[] temp = new PVector[b.length-1];
  arrayCopy(b, 1, temp, 0, b.length-1);
  //println(temp);
  //println(b);
  b = (PVector[]) shorten(b);
  arrayCopy(temp, 0, body, 0, temp.length);
   body = b;
  //println(temp);
  //println(body);
}
  
}

```

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<div class="post-metadata">

**Author:** ![M.Abbas.Askari](https://avatars.discourse-cdn.com/v4/letter/m/f14d63/32.png) [@M.Abbas.Askari](https://discourse.processing.org/u/M.Abbas.Askari)\
**Post date:** [December 25, 2018, 8:20am UTC](https://discourse.processing.org/t/help-snake-growing-algorithm-not-working/6886/2 "2018-12-25T08:20:06Z")

</div>

any one to help!!!  
need help FAST

---

<div class="post-metadata">

**Author:** ![TfGuy44](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/tfguy44/32/41_2.png) [@TfGuy44](https://discourse.processing.org/u/TfGuy44)\
**Post date:** [December 25, 2018, 8:32am UTC](https://discourse.processing.org/t/help-snake-growing-algorithm-not-working/6886/3 "2018-12-25T08:32:07Z")

</div>

I already did snake over here: [Problems with understanding language](https://discourse.processing.org/t/problems-with-understanding-language/3016/5?u=tfguy44)