Class: Contrek::Reducers::Vertex

Inherits:
Object
  • Object
show all
Defined in:
lib/contrek/reducers/visvalingam_reducer.rb

Constant Summary collapse

MAX_AREA = 
Float::MAX

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(pt) ⇒ Vertex

Returns a new instance of Vertex.



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# File 'lib/contrek/reducers/visvalingam_reducer.rb', line 62

def initialize(pt)
  @pt = pt
  @prev = nil
  @next = nil
  @area = MAX_AREA
  @is_live = true
end

Instance Attribute Details

#is_live ⇒ Object (readonly)

Returns the value of attribute is_live.



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# File 'lib/contrek/reducers/visvalingam_reducer.rb', line 108

def is_live
  @is_live
end

#next ⇒ Object (readonly)

Returns the value of attribute next.



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# File 'lib/contrek/reducers/visvalingam_reducer.rb', line 60

def next
  @next
end

#prev ⇒ Object (readonly)

Returns the value of attribute prev.



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# File 'lib/contrek/reducers/visvalingam_reducer.rb', line 60

def prev
  @prev
end

#pt ⇒ Object (readonly)

Returns the value of attribute pt.



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# File 'lib/contrek/reducers/visvalingam_reducer.rb', line 60

def pt
  @pt
end

Class Method Details

.build_line(pts) ⇒ Object 



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# File 'lib/contrek/reducers/visvalingam_reducer.rb', line 70

def self.build_line(pts)
  first = nil
  prev = nil
  pts.each_with_index do |pt, i|
    v = Vertex.new(pts[i])
    first = v if first.nil?

    v.setPrev(prev)
    if !prev.nil?
      prev.setNext(v)
      prev.updateArea
    end
    prev = v
  end
  first
end

Instance Method Details

#get_area ⇒ Object 



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# File 'lib/contrek/reducers/visvalingam_reducer.rb', line 104

def get_area
  @area
end

#get_coordinates ⇒ Object 



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# File 'lib/contrek/reducers/visvalingam_reducer.rb', line 129

def get_coordinates
  coords = []
  curr = self
  loop do
    coords << curr.pt
    curr = curr.next
    break if curr.nil?
  end
  coords
end

#remove ⇒ Object 



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# File 'lib/contrek/reducers/visvalingam_reducer.rb', line 110

def remove
  tmp_prev = @prev
  tmp_next = @next
  result = nil
  if !prev.nil?
    @prev.setNext(tmp_next)
    @prev.updateArea
    result = prev
  end
  if !@next.nil?
    @next.setPrev(tmp_prev)
    @next.updateArea
    result = @next if result.nil?
  end

  @is_live = false
  result
end

#setNext(nextp) ⇒ Object 



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# File 'lib/contrek/reducers/visvalingam_reducer.rb', line 91

def setNext(nextp)
  @next = nextp
end

#setPrev(prev) ⇒ Object 



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# File 'lib/contrek/reducers/visvalingam_reducer.rb', line 87

def setPrev(prev)
  @prev = prev
end

#updateArea ⇒ Object 



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# File 'lib/contrek/reducers/visvalingam_reducer.rb', line 95

def updateArea
  if @prev.nil? || @next.nil?
    @area = MAX_AREA

    return
  end
  @area = Triangle.area(@prev.pt, pt, @next.pt).abs
end