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Efficient Voronoi diagrams and Delaunay trianglation for Ruby
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rubyvor

Efficient Voronoi diagrams and Delaunay trianglation for Ruby

Description

RubyVor provides efficient computation of Voronoi diagrams and Delaunay triangulation for a set of Ruby points. It is intended to function as a complemenet to GeoRuby. These structures can be used to compute a nearest-neighbor graph for a set of points. This graph can in turn be used for proximity-based clustering of the input points.

Usage:

require 'lib/ruby_vor'
require 'pp'

points = [
  RubyVor::Point.new(120, 290),
  RubyVor::Point.new(110, 120),
  RubyVor::Point.new(160, 90.2),
  RubyVor::Point.new(3.14159265, 3.14159265)
]

# Compute the diagram & triangulation
comp = RubyVor::VDDT::Computation.from_points(points)

puts "The nearest-neighbor graph:"
pp comp.nn_graph

puts "\nThe minimum-spanning tree:"
pp comp.minimum_spanning_tree

# # Visualize these things as SVGs #

# Just the triangulation
RubyVor::Visualizer.make_svg(comp, :name => 'tri.svg')

# Just the MST
RubyVor::Visualizer.make_svg(comp, :name => 'mst.svg', :triangulation => false, :mst => true)

# Voronoi diagram and the triangulation
RubyVor::Visualizer.make_svg(comp, :name => 'dia.svg', :voronoi_diagram => true)

LICENSE:

Original public-domain C code (by Steven Fortune; ect.bell-labs.com/who/sjf/) and memory-management fixes for said C code (by Derek Bradley; www.derekbradley.ca) used (and released under the MIT-LICENSE) with permission.

(The MIT License)

Copyright © 2008-2011 Brendan Ribera <brendan.ribera+rubyvor@gmail.com>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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