Class: Array

Inherits:
Object
  • Object
show all
Defined in:
lib/prawn_shapes/arc.rb

Instance Method Summary collapse

Instance Method Details

#unit_perpendicular_vector(options = {}) ⇒ Object

if :counter_clockwise => true option, then return a new vector that points 90 degrees counterlockwise of aVector with a magnitude of 1.0, otherwise return a new vector that points 90 degrees clockwise of aVector with a magnitude of 1.0



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# File 'lib/prawn_shapes/arc.rb', line 208

def unit_perpendicular_vector(options={})
  return [self[1], -self[0]].unit_vector if options[:counter_clockwise]
  [-self[1], self[0]].unit_vector
end

#unit_vector ⇒ Object 



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# File 'lib/prawn_shapes/arc.rb', line 198

def unit_vector
  denominator = Math.sqrt(self[0] * self[0] + self[1] * self[1])
  return self if denominator == 0.0
  [self[0] / denominator, self[1] / denominator]
end