可点击的纹理

Question

我对 LibGdx 和 android studio 有点陌生。 我正在尝试创建可点击的纹理，一个用于播放，一个用于信用。 两者都应该打开一个新的空屏幕/事件。

public void create() {

    batch = new SpriteBatch();
    img = new Texture("Main_Screen.png");
    music = Gdx.audio.newMusic(Gdx.files.internal("bgmusic.wav"));
    music.play();
    music.setLooping(true);
    credits = new Texture("credits.png");
    play = new Texture("play.png");
}


@Override
public void render() {

    Gdx.gl.glClearColor(1, 0, 0, 1);
    Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
    batch.begin();
    batch.draw(img, 0, 0);
    batch.draw(play, 340, 1400);
    batch.draw(credits, 340, 400);
    batch.end();
}

但是我不确定如何做到这一点，因为我也在用纹理创建背景，所以如果有人可以帮助我，我会非常高兴。

Answer 1

使用Sprite 而不是Texture，它保存了用于绘制二维精灵的几何、颜色和纹理信息。

MyGdxGame

public class MyGdxGame extends Game {

    public Screen menuScreen,creditsScreen,playScreen;

    @Override
    public void create () {

        menuScreen=new MenuScreen(this);
        creditsScreen=new CreditsScreen();
        playScreen=new PlayScreen();

        setScreen(menuScreen);
    }
}

菜单屏幕

public class MenuScreen extends InputAdapter implements Screen  {

    SpriteBatch batch;
    Texture background,play,credits;

    Sprite backgoundSprite,playSprite,creditsSprite;
    private ExtendViewport extendViewport;

    OrthographicCamera cam;
    private float w=480;
    private float h=800;
    private Vector3 vector3;

    MyGdxGame game;
    Music music;

    public MenuScreen(MyGdxGame game){
        this.game=game;
    }

    @Override
    public void show() {

        batch = new SpriteBatch();
        cam = new OrthographicCamera();
        extendViewport=new ExtendViewport(w,h,cam);

        vector3=new Vector3();

        background = new Texture("Main_Screen.png");
        play=new Texture("play.png");
        credits=new Texture("credits.png");

        backgoundSprite=new Sprite(background);
        backgoundSprite.setSize(w,h);       // If resources are not in context of your viewport
        backgoundSprite.setPosition(0,0);  //Default Position

        playSprite=new Sprite(play);
        playSprite.setSize(100,100);
        playSprite.setPosition(w/2-playSprite.getWidth()/2,h/2+100);

        creditsSprite=new Sprite(credits);
        creditsSprite.setSize(100,100);
        creditsSprite.setPosition(w/2-creditsSprite.getWidth()/2,h/2-100);

        Gdx.input.setInputProcessor(this);

        music = Gdx.audio.newMusic(Gdx.files.internal("bgmusic.wav"));
        music.play();
        music.setLooping(true);   
    }

    @Override
    public void render(float delta) {

        Gdx.gl.glClearColor(1, 1, 1, 1);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

        batch.setProjectionMatrix(cam.combined);
        batch.begin();
        backgoundSprite.draw(batch);
        playSprite.draw(batch);
        creditsSprite.draw(batch);
        batch.end();
    }

    @Override
    public void resize(int width, int height) {

        extendViewport.update(width,height);
        cam.position.x = w /2;
        cam.position.y = h/2;
        cam.update();
    }

    @Override
    public boolean touchDown(int screenX, int screenY, int pointer, int button) {
        vector3.set(screenX,screenY,0);
        Vector3 position=cam.unproject(vector3);
            if(playSprite.getBoundingRectangle().contains(position.x,position.y)) {
            game.setScreen(game.playScreen);
        }
        if(creditsSprite.getBoundingRectangle().contains(position.x,position.y)){
            game.setScreen(game.creditsScreen);
        }

        return super.touchDown(screenX, screenY, pointer, button);
    }

    @Override
    public void pause() { }

    @Override
    public void resume() { }

    @Override
    public void hide() { }

    @Override
    public void dispose() {
        batch.dispose();
        background.dispose();
        play.dispose();
        credits.dispose();
    }
}

学分屏幕

public class CreditsScreen implements Screen {

    @Override
    public void show() {

    }

    @Override
    public void render(float delta) {
        Gdx.gl.glClearColor(0, 0, 1, 1);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
    }

    @Override
    public void resize(int width, int height) { }

    @Override
    public void pause() { }

    @Override
    public void resume() { }

    @Override
    public void hide() { }

    @Override
    public void dispose() { }
}

播放屏幕

public class PlayScreen implements Screen {

    @Override
    public void show() {

    }

    @Override
    public void render(float delta) {
        Gdx.gl.glClearColor(0, 1, 1, 1);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

    }

    @Override
    public void resize(int width, int height) { }

    @Override
    public void pause() { }

    @Override
    public void resume() { }

    @Override
    public void hide() { }

    @Override
    public void dispose() { }
}

Answer 2

欢迎来到 libGDX！

如果我正确理解了您的问题，那么您正试图弄清楚如何在游戏中更改屏幕。概括地说，这是您需要做的：

1. 在屏幕上绘制按钮纹理。
2. 使用Gdx.input 检测玩家何时抬起鼠标按钮（以及当他们抬起鼠标时它是否超过了您的一个按钮）
3. 发生这种情况时切换到新屏幕（可能带有新背景）。

我建议您首先完成 "A Simple Game" 和 "Extending the Simple Game" 教程，以熟悉 libGDX 和 Game 和 Screen 类的基础知识。

接下来，尝试使用 Scene2D.UI（第二个教程底部有链接）将 Stage 和 TextButtons 添加到您的主菜单。

希望这可以帮助您入门 - 该 libGDX wiki 上有很多有用的信息，我认为您会发现它们很有帮助。