Function: pointInPolygon()

function pointInPolygon(px, py, polygon): boolean;

Experimental

Even-odd (crossing number) point-in-polygon test.

polygon is a flat [x0, y0, x1, y1, ...] ring; the closing edge is implicit. Even-odd is used (rather than non-zero winding) so self-intersecting lasso strokes behave predictably: regions wound an even number of times, e.g. the centre of a pentagram, are outside. Fewer than 3 vertices always returns false.

Parameters

Parameter	Type
px	number
py	number
polygon	ArrayLike<number>

Returns

boolean