I do not what is wrong with the code

Question about the task

Snake (Part 9/20)

Games, Level 0, Lesson 1

Resolved

I don't know how to write correct the code. Please any suggestion.

Moving the snake is very simple: in a cell next to the head, a new head is created, and the last element (tail) of the snake is removed.

In the Snake class, implement a createNewHead() method that creates and returns a new GameObject. The new GameObject must be created next to the element that currently contains the snake head (element with index 0 in snakeParts).

The new GameObject is created in the direction of the snake's movement (direction field).

For example:

- if the snake is moving to the left, new GameObject(headX-1, headY);
- if the snake is moving down, new GameObject(headX, headY + 1)

Here, headX is the x coordinate of the snake's head, and headY is the y coordinate of the snake's head.

Note: coordinates can be negative and/or be beyond the boundaries of the playing field. This is okay for now. We'll fix it later.

Create and implement a removeTail() method in the Snake class.

Requirements:

The Snake class must have a public GameObject createNewHead() method.
The createNewHead() method must be implemented as outlined in the task conditions.
The Snake class must have a public void removeTail() method.
The removeTail() method must remove the last item in the snakeParts list.

package com.codegym.games.snake; import com.codegym.engine.cell.*; public class SnakeGame extends Game{ public static final int WIDTH = 15, HEIGHT = 15; private Snake snake; private int turnDelay; public void initialize(){ setScreenSize(WIDTH,HEIGHT); createGame(); } private void createGame(){ snake = new Snake(WIDTH/2,HEIGHT/2); drawScene(); turnDelay = 300; setTurnTimer(turnDelay); } private void drawScene(){ for(int x=0;x<WIDTH;x++){ for(int y=0;y<HEIGHT;y++){ setCellColor(x,y,Color.DARKSEAGREEN); } } snake.draw(this); } // @Override public void onTurn(int x){ snake.move(); drawScene(); } }

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Gytis Laukaitis Full Stack Developer

2 September 2020, 17:24

What does line 70 do ?

jajaceek

Level 23 , Warszawa, Poland

9 September 2020, 07:16

It removes the last part of the snake.

jajaceek

Level 23 , Warszawa, Poland

15 March 2020, 16:42

solution

ok, it should be like this: public GameObject createNewHead(){ GameObject newHead = snakeParts.get(0); if(direction == Direction.LEFT) { return new GameObject(newHead.x - 1, newHead.y); } else if(direction == Direction.RIGHT) { return new GameObject(newHead.x+1, newHead.y); } else if(direction == Direction.UP) { return new GameObject(newHead.x, newHead.y - 1); } else { return new GameObject(newHead.x, newHead.y + 1); } }