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Question about the task

Snake (Part 11/20)

Games, Level 0, Lesson 1

Resolved

My snake moves correctly when I push the arrow keys however the last tasks are not passing??

Let's add the ability to control our snake. To handle key presses, override the Game parent class's onKeyPress(Key) method. Depending on which key is pressed, set the appropriate direction of snake movement.

Bear in mind that a snake cannot instantly turn 180 degrees.

Requirements:

The SnakeGame class must override the Game parent class's onKeyPress(Key) method.
If Key.LEFT is passed to the onKeyPress(Key) method, you need to call the setDirection(Direction) method on the snake with Direction.LEFT as the argument.
If Key.RIGHT is passed to the onKeyPress(Key) method, you need to call the setDirection(Direction) method on the snake with Direction.RIGHT as the argument.
If Key.UP is passed to the onKeyPress(Key) method, you need to call the setDirection(Direction) method on the snake with Direction.UP as the argument.
If Key.DOWN is passed to the onKeyPress(Key) method, you need to call the setDirection(Direction) method on the snake with Direction.DOWN as the argument.
The Snake class's setDirection(Direction) method must not change the direction of snake movement if the method parameter is the opposite of the current direction.

package com.codegym.games.snake; import com.codegym.engine.cell.*; public class SnakeGame extends Game { public static final int WIDTH = 15; public static final int HEIGHT = 15; private int turnDelay; private Snake snake; public void initialize() { setScreenSize(WIDTH, HEIGHT); createGame(); } public void onTurn(int turn) { snake.move(); drawScene(); } private void createGame() { Snake snake = new Snake(WIDTH / 2, HEIGHT / 2); this.snake = snake; this.turnDelay = 300; drawScene(); setTurnTimer(turnDelay); // Apple apple = new Apple(7, 7); // apple.draw(this); } private void drawScene() { for (int x = 0; x < WIDTH; x++) { for (int y = 0; y < HEIGHT; y++) { setCellValueEx(x, y, Color.SKYBLUE, ""); } } snake.draw(this); } @Override public void onKeyPress(Key key) { Direction d = snake.getDirection(); if (d == Direction.LEFT || d == Direction.RIGHT) { if (key == Key.UP) { snake.setDirection(Direction.UP); } else if (key == Key.DOWN) { snake.setDirection(Direction.DOWN); } } else if (d == Direction.UP || d == Direction.DOWN) { if (key == Key.RIGHT) { snake.setDirection(Direction.RIGHT); } else if (key == Key.LEFT) { snake.setDirection(Direction.LEFT); } } } }

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Thomas

Level 41 , Bayreuth, Germany

12 July 2021, 06:05

Requirements: Bear in mind that a snake cannot instantly turn 180 degrees. but you just do: this.direction = direction; I haven't coded that game yet but if you take the ordinals of the current and the new direction and use modulo on both possible combinations and one result is zero then the new direction is either the same or 180° Or one ordinal has to be even and the other not