Question

我是LibGdx新手，并试图使我的iceCream图像可触摸。我想知道如何设置输入过程（通过触摸屏幕）。我需要再上一堂课吗？当我尝试实现输入过程时在我的Prac1类中，JAVA不允许我在不改变类抽象的情况下实现它。具体来说，我喜欢在用户触摸图像时制作它，它计算触摸次数。这是我的代码，谢谢你的帮助。

import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;

public class Prac1 extends ApplicationAdapter {
    int w,h,tw,th =0;
    OrthographicCamera camera;
    SpriteBatch batch;
    Texture img;

    @Override
    public void create () {
        w = Gdx.graphics.getWidth();
        h = Gdx.graphics.getHeight();
        camera = new OrthographicCamera(w, h);
        camera.position.set(w/2, h/2, 0);
        camera.update();
        batch = new SpriteBatch();
        img = new Texture(Gdx.files.internal("iceCream.png"));
        tw = img.getWidth();
        th = img.getHeight();
    }

    @Override
    public void render () {
        Gdx.gl.glClearColor(0, 0, 0, 1);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
        batch.begin();
        batch.draw(img, camera.position.x - (tw/2), camera.position.y - (th/2));
        batch.end();
    }
}

Answer 1

您可以使用

InputProcessor

来处理用户输入。像这样： -

import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.InputAdapter;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.Sprite;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;

public class Prac1 extends ApplicationAdapter {
    float w,h,tw,th =0;
    OrthographicCamera camera;
    SpriteBatch batch;
    Sprite img;

    @Override
    public void create () {
        w = Gdx.graphics.getWidth();
        h = Gdx.graphics.getHeight();
        camera = new OrthographicCamera(w, h);
        camera.position.set(w/2, h/2, 0);
        camera.update();
        batch = new SpriteBatch();
        img = new Sprite(new Texture(Gdx.files.internal("iceCream.png")));

        tw = img.getWidth();
        th = img.getHeight();
        img.setBounds( camera.position.x - (tw/2), camera.position.y - (th/2),tw,th);
        Gdx.input.setInputProcessor(new InputAdapter(){

            @Override
            public boolean touchDown(int screenX, int screenY, int pointer, int button) {

                if(img.getBoundingRectangle().contains(screenX, screenY))
                       System.out.println("Image Clicked");

                return true;
            }

        });
    }

    @Override
    public void render () {
        Gdx.gl.glClearColor(0, 0, 0, 1);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
        batch.begin();
        img.draw(batch);
        batch.end();
    }
}

将此代码替换为您的代码，您可以轻松了解此处发生的情况。您也可以实施

GestureListener

来处理手势事件。

Answer 2

由于您需要从图像中获取触摸事件，因此您可以使用舞台和演员来完成此操作。您需要使用纹理创建舞台和Image，然后添加Touchable属性：

iceCreamImg.setTouchable(Touchable.enabled);
iceCreamImg.addListener(new InputListener() {
public boolean touchDown (InputEvent event, float x, float y, int pointer, int button) {
    Gdx.app.debug(TAG, "touchDown()");
    // must return true for touchUp event to occur
    return true;
}
public void touchUp (InputEvent event, float x, float y, int pointer, int button) {
    Gdx.app.debug(TAG, "touchUp()");
}

并将Image添加到舞台上。在渲染方法中，您应该添加：

stage.act();
stage.draw();

并使用

为舞台设置输入处理器

Gdx.input.setInputProcessor(stage);

Answer 3

如果要在类中同时使用ApplicationAdapter和InputProcessor，则必须使用接口而不是摘要：将类签名更改为Prac1 implements ApplicationListener, InputProcessor

点击此处查看完整教程： http://www.gamefromscratch.com/post/2013/10/24/LibGDX-Tutorial-5-Handling-Input-Touch-and-gestures.aspx

LibGdx，如何处理触摸事件？

3 个答案: