node package manager


Computes the orientation of 3 points


Tests if 3 points are oriented clockwise, counter-clockwise or colinear.

WARNING This module is deprecated. You should use robust-orientation instead.

var lr = require("left-right")
console.log(lr([1, 0], [0, 0], [0, 1]))
//Prints out:  -1 
npm install left-right

Computes the orientation of a, b, c

  • a,b,c are 3 2d points, encoded as arrays

Returns One of the following values:

  • 1 if a,b,c are counter clockwise oriented
  • -1 if a,b,c are clockwise
  • 0 if they are colinear

(c) 2013 Mikola Lysenko. MIT License