Awesome
SimplifyRb - Polyline simplification
SimplifyRb is a Ruby port of simplify.js by Vladimir Agafonkin.
You can use this gem to reduce the number of points in a complex polyline / polygon, making use of an optimized Douglas-Peucker algorithm.
Usage
require 'simplify_rb'
points = [
{ x: 51.5256, y: -0.0875 },
{ x: 51.7823, y: -0.0912 }
]
tolerance = 1
high_quality = true
SimplifyRb::Simplifier.new.process(points, tolerance, high_quality)
points
: An array of hashes, containing x,y coordinates.
tolerance
: (optional, 1 by default): Affects the amount of simplification that occurs (the smaller, the less simplification).
high_quality
: (optional, False by default): Flag to exclude the distance pre-processing. Produces higher quality results when true is passed, but runs slower.
Custom points
You can also use custom points, such as a struct or object which responds to :x
and :y
, rather than hashes:
CustomPointStruct = Struct.new(:x, :y)
custom_points = [
CustomPointStruct.new(51.5256, -0.0875),
CustomPointStruct.new(51.7823, -0.0912)
]
tolerance = 1
high_quality = true
SimplifyRb::Simplifier.new.process(custom_points, tolerance, high_quality)
Installation
Add this line to your application's Gemfile:
gem 'simplify_rb'
And then execute:
$ bundle
Or install it yourself as:
$ gem install simplify_rb