Rotation of the character is inverted

1

I have this funcion to rotate the character in the direction of my mouse, but for some reason when my mouse is pointing down my charactet points up and when my mouse is pointing up my character points down. How can I solve it?

 public static float RotateTowards(Vector2 Pos, Vector2 focus)
        {

            float h, sineTheta, angle;
            if (Pos.Y - focus.Y != 0)
            {
                h = (float)Math.Sqrt(Math.Pow(Pos.X - focus.X, 2) + Math.Pow(Pos.Y - focus.Y, 2));
                sineTheta = (float)(Math.Abs(Pos.Y - focus.Y) / h); //* ((item.Pos.Y-focus.Y)/(Math.Abs(item.Pos.Y-focus.Y))));
            }
            else
            {
                h = Pos.X - focus.X;
                sineTheta = 0;
            }

            angle = (float)Math.Asin(sineTheta);

            // Drawing diagonial lines here.
            //Quadrant 2
            if (Pos.X - focus.X > 0 && Pos.Y - focus.Y > 0)
            {
                angle = (float)(Math.PI * 3 / 2 + angle);
            }
            //Quadrant 3
            else if (Pos.X - focus.X > 0 && Pos.Y - focus.Y < 0)
            {
                angle = (float)(Math.PI * 3 / 2 - angle);
            }
            //Quadrant 1
            else if (Pos.X - focus.X < 0 && Pos.Y - focus.Y > 0)
            {
                angle = (float)(Math.PI / 2 - angle);
            }
            else if (Pos.X - focus.X < 0 && Pos.Y - focus.Y < 0)
            {
                angle = (float)(Math.PI / 2 + angle);
            }
            else if (Pos.X - focus.X > 0 && Pos.Y - focus.Y == 0)
            {
                angle = (float)Math.PI * 3 / 2;
            }
            else if (Pos.X - focus.X < 0 && Pos.Y - focus.Y == 0)
            {
                angle = (float)Math.PI / 2;
            }
            else if (Pos.X - focus.X == 0 && Pos.Y - focus.Y > 0)
            {
                angle = (float)0;
            }
            else if (Pos.X - focus.X == 0 && Pos.Y - focus.Y < 0)
            {
                angle = (float)Math.PI;
            }

            return angle;
        }

This is how I am using the function

 SetRotation(-Globals.RotateTowards(GetPosition(), new Vector2(Globals.mouseControl.newMousePos.X, Globals.mouseControl.newMousePos.Y) - _offset));
2

I’m not sure what your focus variable is, but if you want to rotate towards the mouse, I would do this:
Vector2 direction = Vector2.Normalize(Globals.mouseControl.newPos - spritePosition) float angle = Math.Atan2(direction.Y, direction.X)

This should give you the angle from your sprite towards your mouse.

1 Like
3

Already solved, just rotate my character png to face up. Thanks anyway

1 Like
4

This is the method I use too… super helpful :slight_smile: