class Array

Public Instance Methods

unit_perpendicular_vector(options={}) click to toggle source

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

# File lib/prawn_shapes/arc.rb, line 202
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() click to toggle source

# File lib/prawn_shapes/arc.rb, line 192
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