libgdx - GroupRraw中的ShapeRenderer呈现错误的颜色 [英] libgdx - ShapeRenderer in Group.draw renders in wrong colour

问题描述

MyGroup ：：

public GShape（）{
super（）;
shape = new ShapeRenderer（）;
}

@Override
public void draw（SpriteBatch batch，float parentAlpha）{
super.draw（batch，parentAlpha）;
shape.begin（ShapeType.Line）;
Gdx.gl10.glLineWidth（5）;
shape.setColor（1,1f，1f，1f）;
shape.line（0，0，200，100）;
shape.end（）;
}
}

主 p>

  public class GameControl实现ApplicationListener {
 private Stage stage; 
 private GShape gShape; 
 
 @Override 
 public void create（）{
 stage = new Stage（480,320，false）; 
 
纹理t = new Texture（Gdx.files.internal（data / the200.png））; 
 Image i = new Image（t）; 
 stage.addActor（i）; 
 gShape = new GShape（）; 
 stage.addActor（gShape）; 
} 
 
 @Override 
 public void dispose（）{
} 
 
 @Override 
 public void render 
 Gdx.gl.glClearColor（0，0，0，1）; 
 Gdx.gl.glClear（GL10.GL_COLOR_BUFFER_BIT）; 
 stage.draw（）; 
 // gShape.render（）; 
} 
 
 @Override 
 public void resize（int width，int height）{
} 
 
 @Override 
 void pause（）{
} 
 
 @Override 
 public void resume（）{
} 
} 
  

形状颜色不是白色吗？为什么？

http://nw7.upanh.com/b3.s38.d3/352dd792eb77ce6df204a7af47ae1ac6_55348087.cos.jpg?rand=0.19125773780979216

解决方案

你可能得到不一致的结果，因为你混合 SpriteBatch 和 ShapeRenderer 上下文。这两个期望状态，它们在OpenGL中存储以保持在 begin（）和 end（）调用之间。

Actor draw（）已经调用 SpriteBatch begin（）的上下文，因此您需要在开始 ShapeRenderer 。 （您需要在返回之前重新启动 SpriteBatch 。

像这样：

  @Override 
 public void draw（SpriteBatch batch，float parentAlpha）{
 super.draw（batch，parentAlpha）; 
 batch.end（）; // **结束批处理上下文
 shape.begin（ShapeType.Line）; 
 // ...绘制线条... 
 shape.end（）
 batch.begin（）; // **重新启动调用者假设的SpriteBatch上下文
} 
  

MyGroup:

public class GShape extends Group{
private ShapeRenderer shape;

public GShape() {
    super();
    shape = new ShapeRenderer();
}

@Override
public void draw(SpriteBatch batch, float parentAlpha) {
    super.draw(batch, parentAlpha);
    shape.begin(ShapeType.Line);
    Gdx.gl10.glLineWidth(5);
    shape.setColor(1, 1f, 1f, 1f);
    shape.line(0, 0, 200, 100);
    shape.end();
}
}

Main:

public class GameControl implements ApplicationListener {
private Stage stage;
private GShape gShape;

@Override
public void create() {
    stage = new Stage(480,320,false);

    Texture t = new Texture(Gdx.files.internal("data/the200.png"));
    Image i = new Image(t);
    stage.addActor(i);
    gShape = new GShape();
    stage.addActor(gShape);
}

@Override
public void dispose() {
}

@Override
public void render() {
    Gdx.gl.glClearColor(0, 0, 0, 1);
    Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
    stage.draw();
//  gShape.render();
}

@Override
public void resize(int width, int height) {
}

@Override
public void pause() {
}

@Override
public void resume() {
}
} 

Colour of shape is not white? Why?

http://nw7.upanh.com/b3.s38.d3/352dd792eb77ce6df204a7af47ae1ac6_55348087.cos.jpg?rand=0.19125773780979216

解决方案

You are probably getting inconsistent results because you're mixing SpriteBatch and ShapeRenderer contexts. Both of these expect state they "store" in OpenGL to be maintained between begin() and end() calls.

The Actor draw() method is called in a context where the SpriteBatch begin() has already been called, so you need to end it before beginning your ShapeRenderer. (And you need to restart the SpriteBatch before returning.

Like this:

@Override
public void draw(SpriteBatch batch, float parentAlpha) {
  super.draw(batch, parentAlpha);
  batch.end();   //  ** End the batch context
  shape.begin(ShapeType.Line);
  // .. draw lines ...
  shape.end()
  batch.begin(); // ** Restart SpriteBatch context that caller assumes is active
}

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