Retrograde Curve Filtering for Variable Offset Curves

A non-transitory computer-readable medium embodying program code executable by a processing device, the non-transitory computer-readable medium comprising:

• program code for identifying at least one offset curve corresponding to at least one base curve;
• program code for identifying a plurality of line segments for identifying the at least one offset curve, wherein each line segment connects a respective sampled point along the path of the at least one base curve to a point along the path of the at least one offset curve;
• program code for determining that the at least one offset curve includes a retrograde region based on analyzing the plurality of line segments;
• program code for modifying the at least one offset curve to eliminate at least some of the retrograde region by applying a radius-modulating filter to one or more of the plurality of line segments.

A system comprising:

• a processor configured to execute instructions stored in a non-transitory computer-readable medium;
• wherein the instructions comprise an image manipulation application configured to perform operations comprising:
• identifying at least one offset curve corresponding to at least one base curve;
• identifying a plurality of line segments for identifying the at least one offset curve, wherein each line segment connects a respective sampled point along the path of the at least one base curve to a point along the path of the at least one offset curve;
• determining that the at least one offset curve includes a retrograde region based on analyzing the plurality of line segments;
• modifying the at least one offset curve to eliminate at least some of the retrograde region by applying a radius-modulating filter to one or more of the plurality of line segments.