The present invention discloses a system and method to recognize the geometric primitives and estimate the intended geometric relationship between the primitives. The system also provides its user an interactive feedback mechanism to better provide the graphic results intended by the user. The areas enclosed by the lines drew by the user is also considered by the system in the graphic result calculation process to improve the graphic results. One main feature of the present system is to provide geometric constraints estimations based on calculation of the constraints' effect on all related primitives and previously existing geometric constraints.