World Units

#1 I helped someone with dragging and dropping a while ago and had to convert screen coords to world coords. This was the function I used. This worked independent of the screen size and resolution.

protected Vector2 _ConvertScreenToWorld(Vector2 coords)
{
    T2DSceneCamera cam = T2DSceneGraph.Instance.Camera as T2DSceneCamera;
    Vector2 relativePos = Vector2.Divide(coords, _screenSize);
       
    return Vector2.Multiply(relativePos, cam.Extent) + cam.SceneMin;
}

XNA's X and Y of the mouse state are passed. They are relative to the upper left of the window. I divide those by the size of the client window to get X and Y values between 0 and 1, which I then scale by the camera extent and add to the minimum position camera position.

Is this what you are looking for, or are you trying for the opposite of this?

#2 Hmm, Ill try that out. I have a 165 x 165 pixel image, but wasnt sure how to convert to world units. Ill give it a whirl and let you know how it turns uot. Thanks josh!

#3 Works like a champ Josh. Below is my slightly modified version and the code that uses it, but it calculates the angle perfectly.

private void OnMousebuttonClicked(float buttonstate)
        {

            MouseState state = Mouse.GetState();
            if (buttonstate == 1) // Means button was pressed
            {
               Vector2 mouseCoordinates = ConvertScreenToWorld(new Vector2((float)state.X,(float)state.Y));
               float angle = T2DVectorUtil.AngleFromTarget(mouseCoordinates, Player.Instance.Sprite.Position);
               float distance =  Vector2.Distance(mouseCoordinates,Player.Instance.Sprite.Position);
              
                // This is a test, now that the Angle is calculated correctly, can implement a angle to Enumeration.Direction function
               Player.Instance.Direction = Arillian.Common.Enumeration.Direction.SouthWest;
               Player.Instance.UpdateAnimation();
            }
        }


   protected Vector2 ConvertScreenToWorld(Vector2 coordinates) 
        {
            // Credit to Joshua A. Thomas for this function :D
            // Get the Current Camera
            T2DSceneCamera currentCamera = (T2DSceneCamera)TorqueObjectDatabase.Instance.FindObject("Camera");
            // Figure out the relative Position
            Vector2 relativePosition = Vector2.Divide(coordinates, GameData.Instance.ScreenResolution);
            // Return the world position
            return Vector2.Multiply(relativePosition, currentCamera.Extent) + currentCamera.SceneMin; 
        }

#4 Glad to help.

#5 First of all: could any replies to this be forwarded to monty@phoenixortho.net

OK, so I have implemented the above code into my test app and my preoblem is this:

When trying to capture mouseEvent info, the X,Y coords are DIFFERENT whenever you move the game window around!!! Example: I start the sample game (game window displays center of computer screen) and click the most top-left area of the screen and get a value of something like 2.299999, BUT when I move the game window around (lets say to the top-left corner of my computer screen, the mouse coords COMPLETELY change!!??? At that point I return a value of something like -49.02929292?????

PLEASE HELP!!

thanks,