I finally have a buggy, working version of my AS3 expand fill (or stroke along a path, or line offset … take your pick). An ActionScript-based (dynamic) equivalent to Flash CS tool’s expand fill feature, also the same as a graphic stroke. Because I need this thing to be as high performing as possible (I’ll be using it at runtime all over the UI), and because this type of solution is a big pile of mathematics, it’s been a very interesting journey. Among the challenges I’ve had to deal with:
- perpendicular and parallel lines
- performance
- line to line intersections
- curve to line and curve to curve intersection
- performance
- capping off intersections with a miter limit or adding a curve
- performance