Class: GreinerHormann::Intersection

Inherits:
Object
  • Object
show all
Defined in:
lib/greiner_hormann/intersection.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(s1, s2, c1, c2) ⇒ Intersection

Returns a new instance of Intersection.



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# File 'lib/greiner_hormann/intersection.rb', line 5

def initialize(s1, s2, c1, c2)
  self.x = self.y = self.to_source = self.to_clip = 0.0
  d = (c2.y - c1.y) * (s2.x - s1.x) - (c2.x - c1.x) * (s2.y - s1.y)
  return if d == 0

  self.to_source = ((c2.x - c1.x) * (s1.y - c1.y) - (c2.y - c1.y) * (s1.x - c1.x)) / d
  self.to_clip = ((s2.x - s1.x) * (s1.y - c1.y) - (s2.y - s1.y) * (s1.x - c1.x)) / d

  if valid
    self.x = s1.x + self.to_source * (s2.x - s1.x)
    self.y = s1.y + self.to_source * (s2.y - s1.y)
  end
end

Instance Attribute Details

#to_clip ⇒ Object

Returns the value of attribute to_clip.



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# File 'lib/greiner_hormann/intersection.rb', line 3

def to_clip
  @to_clip
end

#to_source ⇒ Object

Returns the value of attribute to_source.



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# File 'lib/greiner_hormann/intersection.rb', line 3

def to_source
  @to_source
end

#x ⇒ Object

Returns the value of attribute x.



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# File 'lib/greiner_hormann/intersection.rb', line 3

def x
  @x
end

#y ⇒ Object

Returns the value of attribute y.



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# File 'lib/greiner_hormann/intersection.rb', line 3

def y
  @y
end

Instance Method Details

#valid ⇒ Object 



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# File 'lib/greiner_hormann/intersection.rb', line 19

def valid
  0 < to_source && to_source < 1 && 0 < to_clip && to_clip < 1
end