World.java

package org.test.snake;

import loon.utils.MathUtils;

public class World {
	static final int WORLD_WIDTH = 10;
    static final int WORLD_HEIGHT = 13;
    static final int SCORE_INCREMENT = 10;
    static final float TICK_INITIAL = 0.5f;
    static final float TICK_DECREMENT = 0.05f;

    public Snake snake;
    public Stain stain;
    public boolean gameOver = false;;
    public int score = 0;

    boolean fields[][] = new boolean[WORLD_WIDTH][WORLD_HEIGHT];

    float tickTime = 0;
    static float tick = TICK_INITIAL;

    public World() {
        snake = new Snake();
        placeStain();
    }

    private void placeStain() {
        for (int x = 0; x < WORLD_WIDTH; x++) {
            for (int y = 0; y < WORLD_HEIGHT; y++) {
                fields[x][y] = false;
            }
        }

        int len = snake.parts.size();
        for (int i = 0; i < len; i++) {
            SnakePart part = snake.parts.get(i);
            fields[part.x][part.y] = true;
        }

        int stainX = MathUtils.nextInt(WORLD_WIDTH);
        int stainY = MathUtils.nextInt(WORLD_HEIGHT);
        for (;;) {
            if (fields[stainX][stainY] == false)
                break;
            stainX += 1;
            if (stainX >= WORLD_WIDTH) {
                stainX = 0;
                stainY += 1;
                if (stainY >= WORLD_HEIGHT) {
                    stainY = 0;
                }
            }
        }
        stain = new Stain(stainX, stainY, MathUtils.nextInt(3));
    }

    public void update(float deltaTime) {
        if (gameOver)
            return;

        tickTime += deltaTime;

        while (tickTime > tick) {
            tickTime -= tick;
            snake.advance();
            if (snake.checkBitten()) {
                gameOver = true;
                return;
            }

            SnakePart head = snake.parts.get(0);
            if (head.x == stain.x && head.y == stain.y) {
                score += SCORE_INCREMENT;
                snake.eat();
                if (snake.parts.size() == WORLD_WIDTH * WORLD_HEIGHT) {
                    gameOver = true;
                    return;
                } else {
                    placeStain();
                }

                if (score % 100 == 0 && tick - TICK_DECREMENT > 0) {
                    tick -= TICK_DECREMENT;
                }
            }
        }
    }
}