Jud whether a point on a map is in a polygon for fireCode.
Install: npm install map-pip
eg: var mapPIP = require("map-pip") var polygon = [ [ 121.47, 31.23 ], [ 161.47, 31.23 ], [ 141.47, 51.23 ] ]
console.log( mapPIP(polygon, [ 141.47, 41.23 ]) ) Output: 'inside'
map：{ 0: 'inside', 1: 'outside', 2: 'edge', 3: 'vertex', }