Input.java 文件源码

@Override
public boolean scrolled(int amount) {
    int x = Gdx.input.getX();
    int y = Gdx.input.getY();

    // get camera and viewport
    int index = getCameraCode(x, y);
    Camera camera = renderer.getCamera(index);

    if (camera instanceof OrthographicCamera) {
        OrthographicCamera cam = (OrthographicCamera) camera;
        cam.zoom += ((float) amount / Constants.ZOOM_ORTHOGRAPHIC);
    } else if (camera instanceof PerspectiveCamera) {
        camera.position.sub(camera.direction.tmp().mul((float) amount / Constants.ZOOM_PERSPECTIVE));
    }

    return true;
}