API Reference > geometry-core > Topology > XYParitySearchContext > tryStartEdge tryStartEdge Method test if x,y is a safe first coordinate to start the search. safe start must have non-zero y so that final point test (return to x0,y0) does not need look back for exact crossing logic. tryStartEdge(x0: number, y0: number, x1: number, y1: number): boolean Parameter Type Description x0 number y0 number x1 number y1 number Returns - boolean Defined in core/geometry/src/topology/XYParitySearchContext.ts Line 53 Last Updated: 15 June, 2021