Feature.ignorable constructor
Group a list of Cubic objects to a feature that should be ignored in the default Morph mapping. The feature can have any indentation.
Sometimes, it's helpful to ignore certain features when morphing shapes. This is because only the features you mark as important will be smoothly transitioned between the start and end shapes. Additionally, the default morph algorithm will try to match convex corners to convex corners and concave to concave. Marking features as ignorable will influence this matching. For example, given a 12-pointed star, marking all concave corners as ignorable will create a Morph that only considers the outer corners of the star. As a result, depending on the morphed to shape, the animation may have fewer intersections and rotations. Another example for the other way around is a Morph between a pointed up triangle to a square. Marking the square's top edge as a convex corner matches it to the triangle's upper corner. Instead of moving triangle's upper corner to one of rectangle's corners, the animation now splits the triangle to match squares' outer corners.
cubics - The list of raw cubics describing the feature's shape.
Throws ArgumentError for lists of empty cubics or non-continuous cubics.
Implementation
factory Feature.ignorable(List<Cubic> cubics) => validated(Edge(cubics));