libgdx演員不會更改位置

Question

如果演員被自己的actor.act()方法移動，它會完美地更新位置。但是，如果我通過包含演員的group（其中包含演員，moveBy()方法或moveBy動作）將演員移動，演員將移動，但其getX（）和getY（）值與移動之前保持相同。當他沒有被act()方法移動，而是來自外部方法時，是否有方法讓演員更新其位置？

的片段看起來是這樣的：協調當地演員的

//Bounds are set in the MyActor class, which extends Actor 
MyActor myActor= new MyActor(); 
Group group = new Group(); 
group.addActor(myActor) 

//stage already created 
stage.addActor(group); 

//Doesn't update X and Y, when calling myActor.getX(), myActor.getY() 
group.moveBy(x,y); 

Answer 1

getX()和getY()返回位置。您可以將此位置轉換爲舞臺的座標。

有演員的方法localToStageCoordinates(Vector2 localCoords)是變換指定的點在演員的座標是在舞臺的座標

創建本地位置的一流水平的變量。在localPos和

Vector2 localPos= new Vector2(); 

設定值

localPos.set(myActor.getX(),myActor.getY()); 
Vector2 stagedPos=group.localToStageCoordinates(localPos); 

stagedPos.x和stagedPos.y是您的要求。

測試

public class TestGame extends Game implements InputProcessor{ 

    Stage stage; 
    Image image; 
    Group group; 
    Vector2 vector2=new Vector2(); 

    @Override 
    public void create() { 

     stage=new Stage(); 
     group=new Group(); 

     Gdx.input.setInputProcessor(this); 

     image=new Image(new Texture("image/base.png")); 
     image.setPosition(100,100); 

     group.addActor(image); 
     stage.addActor(group); 

     System.out.println("Initial Position of Actor : "+image.getX()+" And "+image.getY()); 
    } 

    @Override 
    public void render() { 
     super.render(); 

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

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

    @Override 
    public void resize(int width, int height) { 
     super.resize(width, height); 
     stage.getViewport().update(width,height); 
    } 

    @Override 
    public boolean keyDown(int keycode) { 
     return false; 
    } 

    @Override 
    public boolean keyUp(int keycode) { 
     return false; 
    } 

    @Override 
    public boolean keyTyped(char character) { 
     return false; 
    } 

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

     System.out.println("Actor Position Before moveBy on Group is : "+image.getX()+" And "+image.getY()); 

     group.moveBy(50,50); 

     System.out.println("After moveBy applied on Group, Actor Position is : "+image.getX()+"And"+image.getY()); 
     vector2.set(image.getX(),image.getY()); 
     Vector2 stageCord=group.localToStageCoordinates(vector2); 
     System.out.println("Position with Stage Cord. is : "+stageCord.x+" And "+stageCord.y); 

     return false; 
    } 

    @Override 
    public boolean touchUp(int screenX, int screenY, int pointer, int button) { 
     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; 
    } 
} 

輸出是：

演員的初始位置：100.0和100.0
演員的位置moveBy之前集團是：100.0和100.0
應用於集團moveBy後，演員的位置是：100.0和100.0
帶舞臺線的位置。是：150.0和150.0