offsetTo.md

offsetToPaths(params: OffsetParams): Paths | undefined

offsetToPolyTree(params: OffsetParams): PolyTree | undefined

Performs a polygon offset operation, returning the resulting PolyTree or undefined if failed.

This method encapsulates the process of offsetting (inflating/deflating) both open and closed paths using a number of different join types and end types.

Preconditions for offsetting

1. The orientations of closed paths must be consistent such that outer polygons share the same orientation, and any holes have the opposite orientation (ie non-zero filling). Open paths must be oriented with closed outer polygons.
2. Polygons must not self-intersect.

Limitations

When offsetting, small artefacts may appear where polygons overlap. To avoid these artefacts, offset overlapping polygons separately.