Class: StraightSkeleton::Split

Inherits:
Object
  • Object
show all
Includes:
InteriorNode
Defined in:
lib/nswtopo/geometry/straight_skeleton/split.rb

Instance Attribute Summary collapse

Attributes included from Node

#neighbours, #normals, #original, #point, #travel

Instance Method Summary collapse

Methods included from InteriorNode

#<=>, #insert!

Methods included from Node

#active?, #index, #next, #prev, #project, #reflex?, #splits?, #terminal?

Constructor Details

#initialize(nodes, point, travel, source, node) ⇒ Split

Returns a new instance of Split.



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# File 'lib/nswtopo/geometry/straight_skeleton/split.rb', line 5

def initialize(nodes, point, travel, source, node)
  @original, @nodes, @point, @travel, @source, @normal = self, nodes, point, travel, source, node.normals[1]
end

Instance Attribute Details

#source ⇒ Object (readonly)

Returns the value of attribute source.



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# File 'lib/nswtopo/geometry/straight_skeleton/split.rb', line 9

def source
  @source
end

Instance Method Details

#replace!(&block) ⇒ Object 



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# File 'lib/nswtopo/geometry/straight_skeleton/split.rb', line 27

def replace!(&block)
  dup.split!(0, &block)
  dup.split!(1, &block)
  block.call @source
end

#split!(index, &block) ⇒ Object 



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# File 'lib/nswtopo/geometry/straight_skeleton/split.rb', line 22

def split!(index, &block)
  @neighbours = [@source.neighbours[index], @edge[1-index]].rotate index
  @neighbours.inject(&:equal?) ? block.call(prev, prev.is_a?(Collapse) ? 1 : 0) : insert! if @neighbours.any?
end

#viable? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/nswtopo/geometry/straight_skeleton/split.rb', line 11

def viable?
  return false unless @source.active?
  @edge = @nodes.track(@normal).find do |edge|
    (n00, n01), (n10, n11) = edge.map(&:normals)
    p0, p1 = edge.map(&:point)
    next if (point - p0).cross(n00 ? n00 + n01 : n01) < 0
    next if (point - p1).cross(n11 ? n11 + n10 : n10) > 0
    true
  end
end