Class: CTioga2::Graphics::Types::Bijection

Inherits:
Object
  • Object
show all
Defined in:
lib/ctioga2/graphics/types/bijection.rb

Overview

This class represents a reversible arbitrary coordinate transformation, such as the ones that could be desirable for alternative axes. Characterized by two Block objects, #from and #to, that converts respectively from and to the target coordinates.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(from, to = nil) ⇒ Bijection

Creates a new Bijection with the given blocks.



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# File 'lib/ctioga2/graphics/types/bijection.rb', line 39

def initialize(from, to = nil)
  @from = from
  @to = to || @from
end

Instance Attribute Details

#from ⇒ Object

A Block converting from the target coordinates



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# File 'lib/ctioga2/graphics/types/bijection.rb', line 33

def from
  @from
end

#to ⇒ Object

A Block converting to the target coordinates



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# File 'lib/ctioga2/graphics/types/bijection.rb', line 36

def to
  @to
end

Class Method Details

.from_text(spec) ⇒ Object

Creates a Bijection from a text representation.

Takes functions of x. Takes two blocks from to

separated by

– or only one block in the case of an

involution (very common, actually, all 1/x transforms).

todo few things around here to change… in particular, I should try to find a way to include Math…

todo add very common cases ?



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# File 'lib/ctioga2/graphics/types/bijection.rb', line 68

def self.from_text(spec)
  blocks = spec.split(/::/).map do |code|
    eval("proc do |x|\n#{code}\nend")
  end
  return Bijection.new(*blocks)
end

Instance Method Details

#convert_from(vect) ⇒ Object

Converts a vector from the target coordinates



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# File 'lib/ctioga2/graphics/types/bijection.rb', line 52

def convert_from(vect)
  return vect.map do |x|
    self.from.call(x)
  end
end

#convert_to(vect) ⇒ Object

Converts a vector to the target coordinates



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# File 'lib/ctioga2/graphics/types/bijection.rb', line 45

def convert_to(vect)
  return vect.map do |x|
    self.to.call(x)
  end
end