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