Java LibGDX 如何检查精灵是否站在特定的瓷砖上，例如门？

Question

I want to change the map (method changeMapToWinter()) when sprite stands on specific tile of specific map. I have no layers on map.

Currently I do something like that if(sprite.getX() > 100 && sprite.getX() < 200 && sprite.getY() > 100 && sprite.getY() < 200) but of course it works only on one map and do not look too good and I guess there is a better solution for that.

    Texture img;
    TiledMap tiledMap;
    OrthographicCamera camera;
    TiledMapRenderer tiledMapRenderer;
    SpriteBatch sb;
    Texture texture;
    Sprite sprite;
    private ShapeRenderer shapeRenderer;
    private TiledMapTileLayer tileLayer;
    private TiledMap winterMap;


    @Override
    public void create() {
        float w = Gdx.graphics.getWidth();
        float h = Gdx.graphics.getHeight();
        camera = new OrthographicCamera();
        camera.setToOrtho(false, w, h);
        camera.update();
        tiledMap = new TmxMapLoader().load("untitled.tmx");
        winterMap = new TmxMapLoader().load("untitled2.tmx");
        tiledMapRenderer = new OrthogonalTiledMapRenderer(tiledMap);
        Gdx.input.setInputProcessor(this);
        sb = new SpriteBatch();
        texture = new Texture(Gdx.files.internal("bold_brown_blue-1.png"));
        sprite = new Sprite(texture);
    }

    void changeMapToWinter() {
        tiledMap.dispose();
        winterMap = new TmxMapLoader().load("untitled2.tmx");
        tiledMapRenderer = new OrthogonalTiledMapRenderer(winterMap);
    }

    @Override
    public void render() {
        Gdx.gl.glClearColor(1, 0, 0, 1);
        Gdx.gl.glBlendFunc(GL20.GL_SRC_ALPHA, GL20.GL_ONE_MINUS_SRC_ALPHA);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
        camera.update();
        tiledMapRenderer.setView(camera);
        tiledMapRenderer.render();
        sb.begin();
        sb.draw(sprite, (int) (Gdx.app.getGraphics().getWidth() / 2) - (sprite.getWidth()), (int) (Gdx.app.getGraphics().getHeight() / 2) - (sprite.getHeight() / 2));
        sb.end();

        Vector3 click = new Vector3(Gdx.input.getX(), Gdx.input.getY(), 0);
        TiledMapTileLayer layer = (TiledMapTileLayer)tiledMap.getLayers().get(0);

        // WANT TO CHANGE IT
        if(sprite.getX() > 100 && sprite.getX() < 200 && sprite.getY() > 100 && sprite.getY() < 200)
            changeMapToWinter();
    }

Answer 1

Solution you might use can be something like this:

Rectangle changePosition = new Rectangle(100,100,100,100);
if(sprite.getBoundingRectangle().overlaps(changePosition)) ...

Constructor for rectangle have this format Rectangle(float x, float y, float width, float height) .

Also this will behave a bit differently from your code as you weren't taking into account size of the sprite, but this code does.

Btw LibGDX have usefull class for problems like this if you wouldn't be able to find appropriate function in Rectangle class or whatever shape you are using. It is called Intersector .