java - libgdx - Group.draw 中的 ShapeRenderer 以错误的颜色呈现

Question

我的群组:

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();
}
}

主要:

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() {
}
} 

形状的颜色不是白色？为什么？

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

Answer 1

您可能会得到不一致的结果，因为您混合了 SpriteBatch 和 ShapeRenderer 上下文。这两个都期望它们在 OpenGL 中“存储”的状态在 begin() 和 end() 调用之间得到维护。

在 SpriteBatch begin() 已经执行的上下文中调用 Actor draw() 方法已被调用，因此您需要在开始 ShapeRenderer 之前结束它。 (并且返回之前需要重新启动 SpriteBatch。

像这样:

@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
}