LibGdx，如何處理觸摸事件？

我是LibGdx新手，並試圖讓我的iceCream圖像觸摸。我想知道如何設置輸入過程（通過觸摸屏幕）。我需要另外上課嗎？當我嘗試將我的Prac1類的輸入過程實現爲時，JAVA不允許我在不更改類摘要的情況下實現。具體而言，我喜歡每當用戶觸摸圖像時，它都會計算觸摸的次數。這是我的代碼，謝謝你的幫助。LibGdx，如何處理觸摸事件？

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(); 
    } 
}

來源

2016-02-09 IAMBEAST

您可以使用

InputProcessor

處理用戶輸入。像這樣： -

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(); 
    } 
}

替換你的代碼這個代碼，你可以很容易地理解這裏發生了什麼。你也可以實現

GestureListener

來處理手勢事件。

來源

2016-02-09 09:58:54

哦，我想你的答案是正確的:) – IAMBEAST

如果你想在你班同時使用ApplicationAdapter和InputProcessor，你必須使用接口而不是抽象：你們班在這裏簽名更改爲Prac1 implements ApplicationListener, InputProcessor

檢查一個完整的教程： http://www.gamefromscratch.com/post/2013/10/24/LibGDX-Tutorial-5-Handling-Input-Touch-and-gestures.aspx

來源

2016-02-09 09:14:30 Sebastian

由於您需要從圖像中獲取觸摸事件，因此可以使用舞臺和演員來完成。你需要創建一個舞臺上，並與Image你的紋理，然後加入可觸摸的屬性：

 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()"); 
     } 
    });

，並添加圖片到舞臺上。在渲染方法你應該增加：

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

，還可以設置輸入處理器爲你的舞臺與

Gdx.input.setInputProcessor(stage);

來源

2016-02-09 09:22:08 Enigo

LibGdx，如何處理觸摸事件？

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