polyline-normals
Computes the normals of a polyline, using miter joins where multiple segments meet. This is mainly useful to expand thick lines in a vertex shader on the GPU.
var getNormals = require('polyline-normals')
var path = [ [0, 122], [0, 190], [90, 190] ]
var normals = getNormals(path, true)
See the 2d test for an example of how these lines would be extruded.
For more complex line joins and end caps, see extrude-polyline (which builds an indexed mesh).
ThreeJS Example
Coming soon.
Usage
normals(path[, closed])
For the given path, produces a new array of the same length with normal information for each point. The data contains a normal, [nx, ny]
and the length of the miter (default to 1.0 where no join occurs).
[
[ [nx, ny], miterLength ],
[ [nx, ny], miterLength ]
]
If closed
is true, it assumes a segment will be drawn from the last point to the first point, and adjusts those normals accordingly.
License
MIT, see LICENSE.md for details.