Curvature continuous rounds

Curvature continuous rounding is now supported.

Tangent Continuous (G1)

G1 means the two objects are connected and tangency continuous. The tangent vectors have the same direction, but the radius of curvature may change. They are said to have the same slope.

Curvature Continuous (G2)

G2 means two objects are smoothly connected and curvature continuous. Their tangent directions and both radius of curvatures are equal. They are said to have the same curvature.

The following features now support G2