Class: FixedPoint

Inherits:
Object show all
Defined in:
lib/wdd-ruby-ext/utils/fixed_point.rb

Constant Summary collapse

PRECISION = 
2
ARITHMETIC_METHODS = 
%w{+ -}
COMPARE_METHODS = 
%w{> < >= <= <=>}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(initial = 0.0, raw_value = nil, precision = PRECISION) ⇒ FixedPoint

Returns a new instance of FixedPoint.



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# File 'lib/wdd-ruby-ext/utils/fixed_point.rb', line 14

def initialize( initial = 0.0, raw_value = nil, precision=PRECISION )
  @precision = precision
  @factor = 10**@precision
  if raw_value
    @value = raw_value
  else
    @value =  (BigDecimal.new(initial.to_s.gsub(',',''), precision)*@factor).to_i
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args) ⇒ Object 



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# File 'lib/wdd-ruby-ext/utils/fixed_point.rb', line 73

def method_missing method, *args
  if ARITHMETIC_METHODS.include? method.to_s
    arg = (args[0] * @factor).to_i
    result = @value.send(method, arg)
    new_obj = FixedPoint.new(0, result.to_i, @precision)
  elsif COMPARE_METHODS.include? method.to_s
    arg = (args[0] * @factor).to_i
    result = @value.send(method, arg)
  else
    super
  end
end

Instance Attribute Details

#factor ⇒ Object (readonly)

Returns the value of attribute factor.



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# File 'lib/wdd-ruby-ext/utils/fixed_point.rb', line 11

def factor
  @factor
end

#precision ⇒ Object (readonly)

Returns the value of attribute precision.



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# File 'lib/wdd-ruby-ext/utils/fixed_point.rb', line 12

def precision
  @precision
end

#value ⇒ Object (readonly)

Returns the value of attribute value.



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# File 'lib/wdd-ruby-ext/utils/fixed_point.rb', line 10

def value
  @value
end

Instance Method Details

#*(arg) ⇒ Object 



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# File 'lib/wdd-ruby-ext/utils/fixed_point.rb', line 55

def *( arg )
  if arg.is_a? FixedPoint
    result = (@value * arg.value)/arg.factor
  else
    result = (@value * (arg*@factor).to_i) / @factor
  end
  new_obj = FixedPoint.new(0, result.to_i, @precision)
end

#-@ ⇒ Object 



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# File 'lib/wdd-ruby-ext/utils/fixed_point.rb', line 51

def -@
  FixedPoint.new(0, -@value, @precision)
end

#/(arg) ⇒ Object 



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# File 'lib/wdd-ruby-ext/utils/fixed_point.rb', line 64

def /( arg )
  if arg.is_a? FixedPoint
    result = (@value*arg.factor) * arg.value
  else
    result = (@value*@factor) / (arg*@factor).to_i
  end
  new_obj = FixedPoint.new(0, result.to_i, @precision)
end

#==(obj) ⇒ Object 



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# File 'lib/wdd-ruby-ext/utils/fixed_point.rb', line 33

def == obj
  if obj.is_a? Numeric
    @value == (obj * @factor).to_i
  elsif obj.is_a? FixedPoint
    @value == obj.value
  else
    false
  end
end

#abs ⇒ Object 



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# File 'lib/wdd-ruby-ext/utils/fixed_point.rb', line 43

def abs
  if @value > 0
    FixedPoint.new(0, @value, @precision)
  else
    FixedPoint.new(0, -@value, @precision)
  end
end

#to_i ⇒ Object 



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# File 'lib/wdd-ruby-ext/utils/fixed_point.rb', line 29

def to_i
  (@value / @factor).to_i
end

#to_s ⇒ Object 



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# File 'lib/wdd-ruby-ext/utils/fixed_point.rb', line 24

def to_s
  @value.to_s
  "%.0#{@precision}f" % (@value.to_f/@factor)
end