point-in-polygon
Determine if a point is inside of a polygon.
This module casts a ray from the inquiry point and counts intersections,
based on
this algorithm.
example
var inside = require('point-in-polygon');
var polygon = [ [ 1, 1 ], [ 1, 2 ], [ 2, 2 ], [ 2, 1 ] ];
console.dir([
inside([ 1.5, 1.5 ], polygon),
inside([ 4.9, 1.2 ], polygon),
inside([ 1.8, 1.1 ], polygon)
]);
output:
[ true, false, true ]
methods
var inside = require('point-in-polygon')
inside(point, polygon)
Return whether point is contained in polygon.
point should be a 2-item array of coordinates.
polygon should be an array of 2-item arrays of coordinates.
install
npm install point-in-polygon
license
MIT