Class: Osgb::Helmert

Inherits:
Object
  • Object
show all
Defined in:
lib/osgb/helmert.rb

Constant Summary collapse

@@instances = 
{}

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, attributes) ⇒ Helmert 



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# File 'lib/osgb/helmert.rb', line 6

def initialize(name, attributes)
  @name = name
  @tx = attributes[:tx]
  @ty = attributes[:ty]
  @tz = attributes[:tz]
  @rx = (attributes[:rx]/3600).to_radians
  @ry = (attributes[:ry]/3600).to_radians
  @rz = (attributes[:rz]/3600).to_radians
  @s = attributes[:s]
  @@instances[name] = self
end

Instance Attribute Details

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/osgb/helmert.rb', line 3

def name
  @name
end

#rx ⇒ Object

Returns the value of attribute rx.



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# File 'lib/osgb/helmert.rb', line 3

def rx
  @rx
end

#ry ⇒ Object

Returns the value of attribute ry.



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# File 'lib/osgb/helmert.rb', line 3

def ry
  @ry
end

#rz ⇒ Object

Returns the value of attribute rz.



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# File 'lib/osgb/helmert.rb', line 3

def rz
  @rz
end

#s ⇒ Object

Returns the value of attribute s.



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# File 'lib/osgb/helmert.rb', line 3

def s
  @s
end

#tx ⇒ Object

Returns the value of attribute tx.



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# File 'lib/osgb/helmert.rb', line 3

def tx
  @tx
end

#ty ⇒ Object

Returns the value of attribute ty.



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# File 'lib/osgb/helmert.rb', line 3

def ty
  @ty
end

#tz ⇒ Object

Returns the value of attribute tz.



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# File 'lib/osgb/helmert.rb', line 3

def tz
  @tz
end

Class Method Details

.[](name) ⇒ Object 



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# File 'lib/osgb/helmert.rb', line 29

def self.[](name)
  @@instances[name]
end

Instance Method Details

#s1 ⇒ Object 



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# File 'lib/osgb/helmert.rb', line 18

def s1
  s/1e6 + 1
end

#transform(x, y, z) ⇒ Object 



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# File 'lib/osgb/helmert.rb', line 22

def transform(x,y,z)
  xp = tx + x*s1 - y*rz + z*ry
  yp = ty + x*rz + y*s1 - z*rx
  zp = tz - x*ry + y*rx + z*s1
  [xp, yp, zp]
end