libGDX在使用视口并移动相机时如何在屏幕的左上角绘制

Question

public OrthographicCamera camera;
Viewport viewport;

    camera = new OrthographicCamera();
    viewport = new ScalingViewport(Scaling.stretch, 1920, 1080, camera);
    viewport.apply();
    camera.position.set(camera.viewportWidth / 2, camera.viewportHeight / 2, 0);
    camera.update();

then I move the camera with my mouse with this code

Vector3 v = new Vector3(Gdx.input.getX(), Gdx.input.getY(), 0);
    camera.unproject(v);
        camera.position.set(v);
        camera.update();

everything works fine except I have some text I want to draw on the top left corner of the screen. I use camera.combined and it draws it on the original screen but it doesn't follow where I move the camera. How do I accomplish this?

Answer 1

Excellent question, I created a method to return a Vector3 which is relative to the screen position. I'm not sure if there is a built in way to do this or easier way but here is my code below. Good luck on your program me.

public Vector3 relativeVector(float x, float y,OrthographicCamera c){
    return new Vector3(x+c.position.x-c.viewportWidth/2,y+c.position.y-c.viewportHeight/2,0);
}