CAD design with primitive closed shapes

A CAD system comprising:

• a memory for storing primitive three-dimensional parametric shapes including closed shapes;
• and
• a graphical user interface coupled with the memory and a processor, and suitable for performing a computer-implemented method for designing a CAD modeled object with different types of primitive three-dimensional parametric shapes including several types of closed shapes, wherein the method comprises:
• user-interaction with a screen;
• definition in a plane of a stroke corresponding to the user-interaction;
• discretization of the stroke into stroke points;
• computation of a barycenter of the stroke points;
• determination of a type of closed shape to be instantiated as a result of a comparison of a position of the stroke points relative to the barycenter;
• and
• instantiation of the determined type of closed shape;
• wherein the closed shapes include a circle, an ellipse, a square, and a rectangle;
• and
• wherein the determination of a closed shape to be instantiated comprises:
• comparing distances between the stroke points and the barycenter;
• if the distances between the stroke points and the barycenter are evaluated to be equal:
• determining the closed shape to be instantiated to be the circle;
• else:
• comparing angles between consecutive stroke points through the barycenter;
• if the angles between consecutive stroke points through the barycenter are evaluated to be equal:
• determining the closed shape to be instantiated to be the ellipse;
• else:
• comparing a lowest dimension and a highest dimension of a box containing the stroke points;
• if the lowest dimension and the highest dimension of the box are evaluated to be equal:
• determining the closed shape to be instantiated to be the square;
• else:
• determining the closed shape to be instantiated to be the rectangle.

A non-transitory computer readable storage medium having recorded thereon a computer program comprising instructions for performing a computer-implemented method for designing a CAD modeled object with different types of primitive three-dimensional parametric shapes including several types of closed shapes, wherein the method comprises:

• user-interaction with a screen;
• definition in a plane of a stroke corresponding to the user-interaction;
• discretization of the stroke into stroke points;
• computation of a barycenter of the stroke points;
• determination of a type of closed shape to be instantiated as a result of a comparison of a position of the stroke points relative to the barycenter;
• and
• instantiation of the determined type of closed shape;
• wherein the closed shapes include a circle, an ellipse, a square, and a rectangle;
• and
• wherein the determination of a closed shape to be instantiated comprises:
• comparing distances between the stroke points and the barycenter;
• if the distances between the stroke points and the barycenter are evaluated to be equal:
• determining the closed shape to be instantiated to be the circle;
• else:
• comparing angles between consecutive stroke points through the barycenter;
• if the angles between consecutive stroke points through the barycenter are evaluated to be equal:
• determining the closed shape to be instantiated to be the ellipse;
• else:
• comparing a lowest dimension and a highest dimension of a box containing the stroke points;
• if the lowest dimension and the highest dimension of the box are evaluated to be equal:
• determining the closed shape to be instantiated to be the square;
• else:
• determining the closed shape to be instantiated to be the rectangle.