XYParitySearchContext Class

XYParitySearchContext is an internal class for callers that can feed points (without extracting to array structures)

• Most will be via static methods which handle a specific data source.
  • PolygonOps.classifyPointInPolygon(x,y,points: XAndY[])
  • HalfEdgeGraphSearch.pointInOrOnFaceXY(halfEdgeOnFace, x, y) Use pattern:
• Caller must be able to walk around polygon producing x,y coordinates (possibly transformed from actual polygon).
• Caller announce edges to tryStartEdge until finding one acceptable to the search.
• Caller then passes additional points up to and including both x0,y0 and x1, y1 of the accepted start edge. Call sequence is:
  • context = new XYParitySearchContext
  • repeat { acquire edge (x0,y0) (x1,y1) } until context.tryStartEdge(x0,y0,x1,y1);
  • for each (x,y) beginning AFTER x1,y1 and ending with (x1,y1) context.advance (x,y)
  • return context.classifyCounts();

Methods

Properties

Defined in

• topology/XYParitySearchContext.ts Line 25