Rotate the sprite to mouse position

Question

I am using the SFML 1.6 library and I would like to know.

How to rotate a sprite so that it always rotates in the direction where the mouse is on the screen?

Thank.

(preferred specific SFML code)

Answer 1

If you have a sprite position: S = (Sx, Sy) and cursor position C = (Cx, Cy)

You can calculate the angle between the vector = (Cx - Sx, Cy - Sy) and the unit vector, for example = (1, 0, 0).

To calculate the angle, you can use cross product :

And then:

then you calculate the angle:

Finally, you rotate your sprite:

Sprite.SetRotation(alpha); //alpha in degree

Answer 2

This is discussed in the SFML forum at this link .