Class: Coords::Polar

Inherits:
Object
  • Object
show all
Defined in:
lib/coords/polar.rb

Direct Known Subclasses

Spherical

Instance Method Summary collapse

Constructor Details

#initialize(radius, theta) ⇒ Polar

Returns a new instance of Polar.



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# File 'lib/coords/polar.rb', line 4

def initialize(radius, theta)
  @radius = radius
  @theta = theta
end

Instance Method Details

#==(point) ⇒ Object 



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# File 'lib/coords/polar.rb', line 41

def ==(point)
  radius.round(12) == point.radius.round(12) && theta.round(12) == point.theta.round(12)
end

#distance(point) ⇒ Object 



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# File 'lib/coords/polar.rb', line 26

def distance(point)
  Math.sqrt(distance_squared(point))
end

#distance_squared(point) ⇒ Object 



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# File 'lib/coords/polar.rb', line 17

def distance_squared(point)
  x1 = radius * Math.cos(theta)
  x2 = point.radius * Math.cos(point.theta)
  y1 = radius * Math.sin(theta)
  y2 = point.radius * Math.sin(point.theta)

  ((x2 - x1).abs ** 2) + ((y2 - y1).abs ** 2)
end

#radius ⇒ Object 



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# File 'lib/coords/polar.rb', line 9

def radius
  @radius
end

#rotate(radians) ⇒ Object 



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# File 'lib/coords/polar.rb', line 61

def rotate(radians)
  rotated_point = Polar.new(radius, theta)
  rotated_point.rotate!(radians)
  rotated_point
end

#rotate!(radians) ⇒ Object 



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# File 'lib/coords/polar.rb', line 67

def rotate!(radians)
  @theta += radians
  @theta -= (2 * Math::PI) while theta > (2 * Math::PI)
  @theta += (2 * Math::PI) while theta < 0
end

#theta ⇒ Object 



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# File 'lib/coords/polar.rb', line 13

def theta
  @theta
end

#to_cartesian ⇒ Object 



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# File 'lib/coords/polar.rb', line 34

def to_cartesian
  x = radius * Math.cos(theta)
  y = radius * Math.sin(theta)

  Cartesian2d.new(x.round(12), y.round(12))
end

#to_s ⇒ Object 



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# File 'lib/coords/polar.rb', line 30

def to_s
  radius.to_s + ',' + theta.to_s
end

#translate(radius2, theta2) ⇒ Object 



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# File 'lib/coords/polar.rb', line 45

def translate(radius2, theta2)
  translated_point = Polar.new(radius, theta)
  translated_point.translate!(radius2, theta2)
  translated_point
end

#translate!(radius2, theta2) ⇒ Object 



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# File 'lib/coords/polar.rb', line 51

def translate!(radius2, theta2)
  c1 = self.to_cartesian
  c2 = Polar.new(radius2, theta2).to_cartesian
  c3 = c1.translate(c2.x, c2.y)
  p = c3.to_polar

  @radius = p.radius
  @theta = p.theta
end