如何在Andengine场景中居中

Question

Is there a formula to use to center a background in the camera of Andengine.

My camera is the size of the Screen on the particular device which i retrieve using this...

final Display display = getWindowManager().getDefaultDisplay(); 
CAMERA_WIDTH = display.getWidth(); 
CAMERA_HEIGHT = display.getHeight();

int x = //formula to center background in camera or screen on the X axis

int y = //formula to center background in camera or screen on the Y axis

For my SpriteBackground, how could i figure out what is the x, and y to center it in the camera?

The x and y is supplied like this..

Sprite sprite = new Sprite(x,y,TextureRegion);

Answer 1

final float x = CAMERA_WIDTH / 2 - textureRegion.getWidth() / 2;
final float y = CAMERA_HEIGHT / 2 - textureRegion.getHeight() / 2;
Sprite sprite = new Sprite(x, y, textureRegion);

This will make sprite positioned in the middle of the scene. If the camera doesn't move around, it will be the center of the camera (hence screen) too.

Answer 2

You should check setBackground method for your scene. It will center your sprite and move it when your camera moves.

    Sprite background = new Sprite(0,0, CAMERA_WIDTH, CAMERA_HEIGHT, backgroundTextureRegion);
    scene.setBackground(new SpriteBackground(background));