Урок 8. Flappy Bird: добавляем движущиеся трубы | Делаем android игры на LibGDX

Продолжаем серию уроков о том, как сделать игру Flappy Bird для android. На этом уроке добавим движущиеся трубы, между которыми птице надо будет пролетать.

Код измененных классов проекта — под видео:

Bird.java

package info.fandroid.game.sprites;

import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.math.Vector3;

/**
 * Created by Vitaly on 06.11.2015.
 */
public class Bird {
    private static final int MOVEMENT = 100;
    private static final int GRAVITY = -15;
    private Vector3 position;
    private Vector3 velosity;

    private Texture bird;

    public Bird(int x, int y){
        position = new Vector3(x, y, 0);
        velosity = new Vector3(0, 0, 0);
        bird = new Texture("bird.png");
    }

    public Vector3 getPosition() {
        return position;
    }

    public Texture getBird() {
        return bird;
    }

    public void update(float dt){
        if (position.y > 0)
            velosity.add(0, GRAVITY, 0);
        velosity.scl(dt);
        position.add(MOVEMENT * dt, velosity.y, 0);
        if (position.y < 0)
            position.y = 0;

        velosity.scl(1 / dt);


    }
    public void jump(){
        velosity.y = 250;
    }




}

PlayState.java

package info.fandroid.game.states;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.utils.Array;

import info.fandroid.game.FlappyDemo;
import info.fandroid.game.sprites.Bird;
import info.fandroid.game.sprites.Tube;

/**
 * Created by Vitaly on 06.11.2015.
 */
public class PlayState extends State {

    private static final int TUBE_SPACING = 125;
    private static final int TUBE_COUNT = 4;

    private Bird bird;
    private Texture bg;

    private Array<Tube> tubes;

    public PlayState(GameStateManager gsm) {
        super(gsm);
        bird = new Bird(50, 300);
        camera.setToOrtho(false, FlappyDemo.WIDTH / 2, FlappyDemo.HEIGHT / 2);
        bg = new Texture("bg.png");

        tubes = new Array<Tube>();

        for (int i = 0; i < TUBE_COUNT; i++){
            tubes.add(new Tube(i * (TUBE_SPACING + Tube.TUBE_WIDTH)));
        }
    }

    @Override
    protected void handleInput() {
        if (Gdx.input.justTouched())
            bird.jump();

    }

    @Override
    public void update(float dt) {
        handleInput();
        bird.update(dt);
        camera.position.x = bird.getPosition().x + 80;

        for (Tube tube : tubes){
            if (camera.position.x - (camera.viewportWidth / 2) > tube.getPosTopTube().x + tube.getTopTube().getWidth()){
                tube.reposition(tube.getPosTopTube().x + ((Tube.TUBE_WIDTH + TUBE_SPACING) * TUBE_COUNT));
            }
        }
        camera.update();

    }

    @Override
    public void render(SpriteBatch sb) {
        sb.setProjectionMatrix(camera.combined);
        sb.begin();
        sb.draw(bg, camera.position.x - (camera.viewportWidth / 2), 0);
        sb.draw(bird.getBird(), bird.getPosition().x, bird.getPosition().y);
        for (Tube tube : tubes) {
            sb.draw(tube.getTopTube(), tube.getPosBotTube().x, tube.getPosTopTube().y);
            sb.draw(tube.getBottomTube(), tube.getPosBotTube().x, tube.getPosBotTube().y);
        }
        sb.end();

    }

    @Override
    public void dispose() {

    }
}

Tube.java

package info.fandroid.game.sprites;

import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.math.Vector2;

import java.util.Random;

/**
 * Created by Vitaly on 13.11.2015.
 */
public class Tube {

    public static final int TUBE_WIDTH = 52;

    private static final int FLUCTUATION = 130;
    private static final int TUBE_GAP = 100;
    private static final int LOWEST_OPENING = 120;

    private Texture topTube, bottomTube;
    private Vector2 posTopTube, posBotTube;
    private Random rand;

    public Texture getTopTube() {
        return topTube;
    }

    public Texture getBottomTube() {
        return bottomTube;
    }

    public Vector2 getPosTopTube() {
        return posTopTube;
    }

    public Vector2 getPosBotTube() {
        return posBotTube;
    }

    public Tube(float x){
        topTube = new Texture("toptube.png");
        bottomTube = new Texture("bottomtube.png");
        rand = new Random();

        posTopTube = new Vector2(x, rand.nextInt(FLUCTUATION) + TUBE_GAP + LOWEST_OPENING);
        posBotTube = new Vector2(x, posTopTube.y - TUBE_GAP - bottomTube.getHeight());

    }

    public void reposition(float x){
        posTopTube.set(x, rand.nextInt(FLUCTUATION) + TUBE_GAP + LOWEST_OPENING);
        posBotTube.set(x, posTopTube.y - TUBE_GAP - bottomTube.getHeight());
    }
}

Больше уроков:
Уроки по android разработке: тут
Дизайн android приложений: тут
Основы программирования на JAVA: тут
Инструменты android разработчика: тут

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Урок 9. Flappy Bird: реализуем обнаружение столкновений птицы с трубами>>