Problems with camera.unproject

Newbie & Debugging Questions
#1

I want to make my player sprite to rotate towards mouse position, but the world y-axis starts from bottom and the mouse postiitons y-axis starts from the top. I could flip the y-axis from the camera with camera.setToOrtho(false); I’ve heard that you can also use camera.unproject when calculating the rotation.

Here is my player rotation method

public void rotateToMousePosition(Vector2 playerPos,Vector2 targetPos, OrthographicCamera camera){
		camera.unproject(new Vector3(targetPos, 0));
		float deltaX = playerPos.x - targetPos.x;
		float deltaY = playerPos.y - targetPos.y;
		float degrees = MathUtils.atan2(deltaX, deltaY) * MathUtils.radiansToDegrees; //calculating rotation
		
		this.setRotation(degrees);
	}

However this does not solve the y-axis problem. mouse.getY() y-axis still starts from the top. I’m doing somethong wrong?

#2

You have to use the vector returned from unproject, the method itself does not do anything to the camera.


public void rotateToMousePosition(Vector2 playerPos,Vector2 targetPos, OrthographicCamera camera){
      Vector3 tmp = camera.unproject(new Vector3(targetPos, 0)); // transform from screenspace to worldspace
      Vector2 transformedTargetPos = new Vector2(tmp.x, tmp.y);
      float deltaX = playerPos.x - transformedTargetPos.x;
      float deltaY = playerPos.y - transformedTargetPos.y;
      float degrees = MathUtils.atan2(deltaX, deltaY) * MathUtils.radiansToDegrees; //calculating rotation
      
      this.setRotation(degrees);
}

EDIT: also atan2 accepts parameters as (y, x), not (x, y).

#3

Got it worked finally. Thanks for the fast reply