If I have a character on the screen, how do I make it look in the direction my mouse is pointing? [duplicate]

Question

Possible Duplicate:
Set sprite to face direction of mouse

I'm drawing a character on the screen, and I would like it so that the character is looking where my mouse is pointing. It's a birds eye view, and the character moves as well. Also any pathfinding collision tutorials would be appreciated

Answer 1

Suppose you had

Vector2 characterPosition; //on viewport
float characterRotation; //in radians

Suppose you also had the current mouse position

MouseState mouseState = Mouse.GetState();
Vector2 mousePosition = new Vector2(mouseState.X, mouseState.Y);

Then you could calculate the vector that points from character to mouse position

Vector2 dPos = mousePosition - characterPosition;

You could then use Math.Atan2 to get the angle that this vector forms with positive x axis. That would be the needed angle for the character, so you set it for your characters rotation:

characterRotation = (float)Math.Atan2(dPos.Y, dPos.X);