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Marker rotation

Feb 7, 2013 at 10:53 AM
Edited Feb 7, 2013 at 10:54 AM
hi,
I have a project where I draw an image over one marker. I want that when I rotate the marker the image rotates with it. Say, I rotate the marker 90 degree the image also must turn 90 degree.
I tryed something like this but it doesn't work( the image keeps rotating 0-90)
 StreamWriter sr = new StreamWriter("out.txt", true);
                pers1.WorldTransformation.Decompose(out x, out outRotation, out y);
                float a = x.X;
                float b = x.Y;
                scene.CameraNode.WorldTransformation.Decompose(out x, out outRotation, out y);
                q = Math.Atan2(b - x.Y, a - x.X);
                if (q != 0)
                    rotire = q;
                sr.WriteLine("q= " + q);
                sr.Close();

                coor2d = State.Device.Viewport.Project(
                   vect, // The 3D coordinates (Vector3) you want to project to screen space
                   State.ProjectionMatrix,          // Projection matrix of your camera
                   Matrix.Identity,                 // View matrix of your camera (since ALVAR camera is located at 0,0,0 we can just pass Identity)
                  pers1.WorldTransformation);
                DrawImage(imagine, Convert.ToInt32(coor2d.X) - 50, Convert.ToInt32(coor2d.Y) - 50, rotire);

 private void DrawImage(Texture2D nume_imagine, int x, int y, double q)
        {
            if (imagine != null)
            {
                spriteBatch2.Begin();
                //spriteBatch2.Draw(nume_imagine, new Rectangle(x, y, 100, 100), Color.White);
                spriteBatch2.Draw(nume_imagine, new Vector2(x, y), null, Color.White, rotire, new Vector2(0, 0), new Vector2((float)(100) / (float)(nume_imagine.Width), (float)(100) / (float)(nume_imagine.Height)), SpriteEffects.None, 0);
              
                spriteBatch2.End();
            }

//nume_imagine is the image name and rotire is the rotation angle.
Can someone help?
thanks!