Libgdx - How to draw filled rectangle in the right place in scene2d?

问题

I am using scene2d. Here is my code:

    group.addActor(new Actor() {
        @Override
        public Actor hit(float arg0, float arg1) {return null;}
        @Override
        public void draw(SpriteBatch batch, float arg1) {
            batch.end();
            shapeRenderer.begin(ShapeType.FilledRectangle);
            shapeRenderer.setColor(Color.RED);
            shapeRenderer.filledRect(0, 0, 300, 20);
            shapeRenderer.end();
            batch.begin();
        }
    });

The problem is that it draws this rectangular relative to screen (x = 0, y = 0), but I need it to be drawn relative to my group. But if I draw other entities with:

batch.draw(texture, 0, 0, width, height);

it correctly draws at (x = 0, y = 0) relative my group (0,0 pixels from left-bottom corner of the group).

Any suggestions how can I implement shape drawing in scene2d? And can someone can explain why these two calls work differently?

回答1:

ShapeRenderer has its own transform matrix and projection matrix. These are separate to those in the SpriteBatch that the scene2d Stage uses. If you update the ShapeRenderer's matrices to match those that scene2d is using when Actor.draw() is called then you should get the results that you want.

回答2:

As Rod Hyde mentions, ShapeRenderer has its own transform matrix and projection matrix. So you would have to get the SpriteBatch's projection Matrix first. I am not sure if there is an elegant way to do it, I did it like this:

public class myActor extends Actor{

 private ShapeRenderer shapeRenderer;
 static private boolean projectionMatrixSet;

 public myActor(){
     shapeRenderer = new ShapeRenderer();
     projectionMatrixSet = false;
 }

 @Override
   public void draw(SpriteBatch batch, float alpha){
       batch.end();
       if(!projectionMatrixSet){
           shapeRenderer.setProjectionMatrix(batch.getProjectionMatrix());
       }
       shapeRenderer.begin(ShapeType.Filled);
       shapeRenderer.setColor(Color.RED);
       shapeRenderer.rect(0, 0, 50, 50);
       shapeRenderer.end();
       batch.begin();

   }
}

回答3:

The best solution for me. Cause when you using ShapeRenderer it's doesn't react on moving/zooming camera.

public class Rectangle extends Actor {

    private Texture texture;

    public Rectangle(float x, float y, float width, float height, Color color) {
        createTexture((int)width, (int)height, color);

        setX(x);
        setY(y);
        setWidth(width);
        setHeight(height);
    }

    private void createTexture(int width, int height, Color color) {
        Pixmap pixmap = new Pixmap(width, height, Pixmap.Format.RGBA8888);
        pixmap.setColor(color);
        pixmap.fillRectangle(0, 0, width, height);
        texture = new Texture(pixmap);
        pixmap.dispose();
    }

    @Override
    public void draw(Batch batch, float parentAlpha) {
        Color color = getColor();
        batch.setColor(color.r, color.g, color.b, color.a * parentAlpha);
        batch.draw(texture, getX(), getY(), getWidth(), getHeight());
    }
}

回答4:

You need to convert the Actor's local coordinates into screen coordinates. Assuming your stage is full-screen, you can just use Actor.localToStageCoordinates:

vec.set(getX(), getY());
this.localToStageCoordinates(/* in/out */ vec);
shapeRenderer.filledRect(vec.x, vec.y, getWidth(), getHeight());

Where vec is a private Vector2d (you don't want to allocate a new one on each render call).

This is also assuming that your ShapeRenderer is defined to be map to the full screen (which is the default).

Also, if you switch away from the ShapeRenderer and back to the SpriteBatch, note that the batch is already adjusted to Actor coordinates (and thus you can use getX() and getY() directly with batch.draw(...).

来源：https://stackoverflow.com/questions/15397074/libgdx-how-to-draw-filled-rectangle-in-the-right-place-in-scene2d