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Snake.java
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Snake.java
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package org.snake.model;
import java.util.LinkedList;
import java.util.List;
import lombok.Getter;
/**
* Represents a snake in the game.
*/
public class Snake {
@Getter
private List<Element> body;
@Getter
private Direction direction;
@Getter
private int length;
@Getter
private int width;
@Getter
private int height;
public Snake(int width, int height) {
this.width = width;
this.height = height;
body = new LinkedList<>();
initSnake();
}
/**
* Returns the head element of the snake.
*
* @return snake's head element
*/
public Element getHead() {
return body.getFirst();
}
/**
* Returns the last element of the snake's body.
*
* @return snake's last element
*/
public Element getLastElement() {
return body.getLast();
}
/**
* Adds a new element to the snake's body.
*
* @param element the new element to add
*/
private void addElement(Element element) {
body.addLast(element);
}
/**
* Grows the snake by adding a new element to its body.
*/
public void growUp() {
Element newPart = new Element(getLastElement().getXcord(), getLastElement().getYcord());
addElement(newPart);
length++;
System.out.println("Snake grown up. Length: " + length);
}
/**
* Initializes the snake with a default direction and length.
*/
private void initSnake() {
direction = Direction.RIGHT;
addElement(new Element(0, 0));
length = 1;
}
/**
* Moves the snake in its current direction.
*/
protected void move() {
int newX = (getHead().getXcord() + direction.getDirectionX() + width) % width;
int newY = (getHead().getYcord() + direction.getDirectionY() + height) % height;
Element newHead = new Element(newX, newY);
body.addFirst(newHead);
body.removeLast();
}
/**
* Turns the snake to the right.
*/
public void turnRight() {
if (direction != Direction.LEFT) {
direction = Direction.RIGHT;
}
}
/**
* Turns the snake to the left.
*/
public void turnLeft() {
if (direction != Direction.RIGHT) {
direction = Direction.LEFT;
}
}
/**
* Turns the snake up.
*/
public void turnUp() {
if (direction != Direction.DOWN) {
direction = Direction.UP;
}
}
/**
* Turns the snake down.
*/
public void turnDown() {
if (direction != Direction.UP) {
direction = Direction.DOWN;
}
}
public boolean checkHeadCollisionWithItsBody() {
for (int i = 1; i < body.size(); i++) {
if (checkCollisionWithHead(body.get(i))) {
return true;
}
}
return false;
}
/**
* Checks if some element has collided with snake's body.
*
* @param collider the element to check for collision
* @return true if the element has collided with snake's body, false otherwise
*/
protected boolean checkCollisionWithBody(Element collider) {
return collider.checkCollisionWithOthers(body);
}
/**
* Checks if some element has collided with snake's head.
*
* @param collider the element to check for collision
* @return true if the snake's head has collided with an element, false otherwise
*/
protected boolean checkCollisionWithHead(Element collider) {
if (collider.getXcord() == getHead().getXcord() && collider.getYcord() == getHead().getYcord()) {
return true;
}
return false;
}
protected boolean checkCollisionWithHead(List<Element> colliders) {
for (Element e : colliders) {
if (checkCollisionWithHead(e)) {
return true;
}
}
return false;
}
}