simplify-path

Simplifies a 2D polyline, first using a radial distance check, and then a recursive Douglas-Peucker algorithm. The code is from simplify-js, but uses arrays for better interoperability with npm modules like stack.gl, parse-svg-path, chaikin-smooth, ndarray, etc.

var simplify = require('simplify-path')
 
//our input polyline
var path = [ [250, 150], [250, 150], [25, 25], [24, 25], [10, 10] ]
var tolerance = 10
 
//result
path = simplify(path, tolerance)

Result:

[ [ 250, 150 ], [ 25, 25 ], [ 10, 10 ] ]

Or you can use the algorithms individually:

var path2 = simplify.radialDistance(path, tolerance)
var path3 = simplify.douglasPeucker(path, tolerance)

You can also require each algorithm separately:

var simplify1 = require('simplify-path/radial-distance')
var simplify2 = require('simplify-path/douglas-peucker')

Note: For performance, this does not produce a deep copy of the input.

Usage

simplify(path, tolerance)

Simplifies the input path with the specified tolerance, removing redundant points first using radial distance, then Douglas-Peucker algorithm. Returns an array of simplified points.

simplify.radialDistance(path, tolerance)

Like above, but using only the Radial Distance algorithm.

simplify.douglasPeucker(path, tolerance)

Like above, but using only the Douglas-Peucker algorithm.

License

MIT, see LICENSE.md for details.