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compare-angle

compare-angle

Let A, B, C and D be four points in the plan. Then of the pair of angles ABC and ABD, determine which is larger.

  C
  *      D
   \     *
    \ABC/
     \ / ABD
      *-------------*
      B             A

Example

var compareAngle = require("compare-angle")
 
var A = [2, 0]
var B = [0, 0]
var C = [-1, 2]
var D = [1, 1]
 
console.log(compareAngle(A, B, C, D),  compareAngle(A, B, D, C))

Output:

1   -1

Install

npm install compare-angle

API

require("compare-angle")(a, b, c, d)

Compares the angles ABC and ABD to determine which is greater.

  • a, b are the base points of the angle
  • c is the end of the first angle
  • d is the end of the second angle

Returns A number indicating which angle is larger

  • +1 if angle ABC is greater than angle ABD
  • 0 if the angles are equal
  • -1 if angle ABD is greater than angle ABC

Credits

(c) 2014 Mikola Lysenko. MIT License