Question

我坚持使用libgdx实现touchDragged监听器。

这是我的代码，任何人都可以建议在用户触摸图像时如何拖动图像而不是移动手指？

我使用舞台和演员，我想在演员身上捕捉touchDragged事件。

感谢。

public void create () {
    Texture.setEnforcePotImages(false);

    stage = new Stage();
    Gdx.input.setInputProcessor(stage);
    // create a SpriteBatch with which to render the sprite
    batch = new SpriteBatch();

    // load the sprite's texture. note: usually you have more than
    // one sprite in a texture, see {@see TextureAtlas} and {@see TextureRegion}.
    texture = new Texture(Gdx.files.internal("ball3.png"));
    Skin skin = new Skin();
    skin.add("default", new Label.LabelStyle(new BitmapFont(), Color.WHITE));
    skin.add("ball", texture);
    Image sourceImage = new Image(skin, "ball");
    sourceImage.setBounds(50, 125, 100, 100);
    stage.addActor(sourceImage);

    // create an {@link OrthographicCamera} which is used to transform
    // touch coordinates to world coordinates.
    camera = new OrthographicCamera();

    // we want the camera to setup a viewport with pixels as units, with the
    // y-axis pointing upwards. The origin will be in the lower left corner
    // of the screen.
    camera.setToOrtho(false);
}

public void render () {
    Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
    stage.act(Gdx.graphics.getDeltaTime());
    stage.draw();
    Table.drawDebug(stage);



    // if a finger is down, set the sprite's x/y coordinate.
    if (Gdx.input.isTouched()) {
        // the unproject method takes a Vector3 in window coordinates (origin in
        // upper left corner, y-axis pointing down) and transforms it to world
        // coordinates.
        camera.unproject(spritePosition.set(Gdx.input.getX(), Gdx.input.getY(), 0));
    }
}

Answer 1

以下是步骤：

您需要检查手指是否正在触摸要移动的对象。以下是一些有用的方法来获取您的手指位置：
```
Gdx.input.getX();
Gdx.input.getY();
```
触摸时，您需要使用变量来跟踪手指是否在移动。
如果变量为 true ，则将对象的位置更改为手指的位置。
当手指不再触摸屏幕时，您将禁用变量。

Answer 2

我建议你使用InputProcessor：

public class MyInputProcessor implements InputProcessor{
    @Override
    public boolean keyDown(int keycode){
        return false;
    }
    @Override
    public boolean keyUp(int keycode){
        return false;
    }
    @Override
    public boolean touchDown(int screenX, int screenY, int pointer, int button){
        return false;
    }
    @Override
    public boolean touchUp(int screenX, int screenY, int pointer, int button){
        return false;
    }
    @Override 
    public boolean keyTyped(char character){
           return false;
    }
    @Override 
    public boolean touchDragged(int screenX, int screenY, int pointer){
        return false;
    }
    @Override 
    public boolean mouseMoved(int screenX, int screenY){
        return false;
    }
    @Override 
            public boolean scrolled(int amount) {
                    return false;
            }   
}

让它成为一个领域：

MyInputProcessor inputProcessor;

在onCreate（）中：

inputProcessor = new MyInputProcessor();
Gdx.input.setInputProcessor(inputProcessor);

这样你就可以在touchDragged回调中实现你的代码。

如何实现libgdx touchDragged？

2 个答案: