ArrayList snake = new ArrayList(); SnakePart head; SnakeFood food; char direction;

void setup() { size(500,500); frameRate(8); snake.add(new SnakePart(0,0)); food = new SnakeFood(); smooth(); }

void draw() { background(100); head = (SnakePart)snake.get(0); moveBody(); moveHead();

chackGameOver(); //check if the snake ate the food if(dist(head.x.head.y,food.x,food.y)<5) { food = new SnakeFood(); snake.add(new SnakePart(head.x, head.y)); }

//Draw everything to the screen food.display(); for(int i = 0; i<snake.size(); i++) { SnakePart sp =(SnakePart)snake.get(i); sp.display(); }

class SnakeFood { int x,y;

SnakeFood()
{
  x = int(random(width/20))*20;
  y = int(random(height/20))*20;
}

void display()
{
  fill(255,100,100);
  rect(x,y,20,20);
}

} }

void KeyPressed()//the direction { if(key =='a') direction ='w'; if(key =='d') direction ='e'; if(key =='w') direction = 'n'; if(key =='s') direction ='s'; } void moveHead()//move the head { switch(direction) { case'n': head.y -=20; break;

  case's':
  head.y +=20;
  break;

  case'e':
  head.x +=20;
  break;

  case'w':
  head.x -=20;
}

void moveBody()
{
  for(int i = snake.size()-1; i>0; i--)
  {
    SnakePart front =(SnakePart)snake.get(i-1);
    SnakePart back =(SnakePart)snake.get(i);
    back.x = front.x;
    back.y = front.y;
  }

void checkGameOver()
{
  for(int i =1; i<snake.size(); i++)
  {
    SnakePart sp =(SnakePart)snake.get(i);
    if(disk(head.x,head.y,sp.x,sp.y)<5)
    {
      println("Game Over!");
      noLoop();
    }
  }
  if(head.x<0 || head.x>width || head.y<0 || head.y>height)
  {
    println("Game Over!");
    noLoop();
  }
}