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Contents
require 'forwardable'
# The Nature of Code
# <http://www.shiffman.net/teaching/nature>
# Spring 2010
# Toxiclibs example: http://toxiclibs.org/
# Force directed graph
# Heavily based on: http://code.google.com/p/fidgen/
# A cluster is a grouping of Nodes
class Cluster
extend Forwardable
def_delegators(:@app, :stroke, :stroke_weight, :line, :physics)
attr_reader :nodes, :diameter
# We initialize a Cluster with a number of nodes, a diameter, and centerpoint
def initialize(n, d, center)
@app = $app
# Set the diameter
@diameter = d
# Create the nodes
@nodes = (0..n).map { Node.new(center.add(TVec2D.randomVector)) }
# Connect all the nodes with a Spring
nodes[0..nodes.size - 2].each_with_index do |ni, i|
nodes[i + 1..nodes.size - 1].each do |nj|
# A Spring needs two particles, a resting length, and a strength
physics.add_spring(Physics::VerletSpring2D.new(ni, nj, diameter, 0.01))
end
end
end
def display
# Show all the nodes
nodes.each(&:display)
end
# Draw all the internal connections
def show_connections
stroke(0, 150)
stroke_weight(2)
nodes[0..nodes.size - 2].each_with_index do |pi, i|
nodes[i + 1..nodes.size - 1].each do |pj|
line(pi.x, pi.y, pj.x, pj.y)
end
end
end
end
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11 entries across 11 versions & 1 rubygems