is-clockwise

Returns true if the sum of signed distances is greater than zero, which can be used as a quick test for convex polygon orientation.

var isClockwise = require('is-clockwise')
var points = [ [0, 0], [1, 1], [1, 0], [0, 0] ]

var cw = isClockwise(points)

console.log(cw) // true

See robust-orientation for a stronger test that handles floating point errors and other edge cases.

Usage

isClockwise(points)

Returns true if the points are clockwise, false if counter-clockwise. Assuming cartesian space.

License

MIT, see LICENSE.md for details.