Class: Mapper

Inherits:
Array
  • Object
show all
Defined in:
lib/mapper.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(reference_point1 = {:lat=>0.0,:lon=>0.0,:x=>0,:y=>0}, reference_point2 = {:lat=>0.0,:lon=>0.0,:x=>0,:y=>0}) ⇒ Mapper

Returns a new instance of Mapper.



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# File 'lib/mapper.rb', line 5

def initialize(reference_point1={:lat=>0.0,:lon=>0.0,:x=>0,:y=>0}, reference_point2={:lat=>0.0,:lon=>0.0,:x=>0,:y=>0})
  @reference_point1 = reference_point1; @reference_point2 = reference_point2
  @x_factor = (reference_point1[:x] - reference_point2[:x]) / (reference_point1[:lon] - reference_point2[:lon]).to_f
  @y_factor = (reference_point1[:y] - reference_point2[:y]) / (reference_point1[:lat] - reference_point2[:lat]).to_f
  @zero_point = {:lon => reference_point1[:lon] - reference_point1[:x] / @x_factor, :x => 0,
                 :lat => reference_point1[:lat] - reference_point1[:y] / @y_factor, :y => 0}
end

Instance Attribute Details

#reference_point1 ⇒ Object (readonly)

Returns the value of attribute reference_point1.



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# File 'lib/mapper.rb', line 2

def reference_point1
  @reference_point1
end

#reference_point2 ⇒ Object (readonly)

Returns the value of attribute reference_point2.



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# File 'lib/mapper.rb', line 2

def reference_point2
  @reference_point2
end

#x_factor ⇒ Object (readonly)

Returns the value of attribute x_factor.



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# File 'lib/mapper.rb', line 3

def x_factor
  @x_factor
end

#y_factor ⇒ Object (readonly)

Returns the value of attribute y_factor.



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# File 'lib/mapper.rb', line 3

def y_factor
  @y_factor
end

#zero_point ⇒ Object (readonly)

Returns the value of attribute zero_point.



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# File 'lib/mapper.rb', line 2

def zero_point
  @zero_point
end

Instance Method Details

#add_point(point) ⇒ Object 



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# File 'lib/mapper.rb', line 21

def add_point(point)
  self << get_coords(point)
end

#get_coords(point = {:lon=>0.0,:lat=>0.0}) ⇒ Object 



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# File 'lib/mapper.rb', line 13

def get_coords( point={:lon=>0.0,:lat=>0.0} )
  point.merge!(:x => (point[:lon] - @zero_point[:lon]) * @x_factor) if point[:lon] && !point[:x]
  point.merge!(:y => (point[:lat] - @zero_point[:lat]) * @y_factor) if point[:lat] && !point[:y]
  point.merge!(:lon => (point[:x] / @x_factor) + @zero_point[:lon]) if point[:x] && !point[:lon]
  point.merge!(:lat => (point[:y] / @y_factor) + @zero_point[:lat]) if point[:y] && !point[:lat]
  point
end