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Contents
require 'bigdecimal'
class FixedPoint
PRECISION = 2
ARITHMETIC_METHODS = %w{+ -}
COMPARE_METHODS = %w{> < >= <= <=>}
attr :value
attr :factor
attr :precision
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
def to_s
@value.to_s
"%.0#{@precision}f" % (@value.to_f/@factor)
end
def to_i
(@value / @factor).to_i
end
def == obj
if obj.is_a? Numeric
@value == (obj * @factor).to_i
elsif obj.is_a? FixedPoint
@value == obj.value
else
false
end
end
def abs
if @value > 0
FixedPoint.new(0, @value, @precision)
else
FixedPoint.new(0, -@value, @precision)
end
end
def -@
FixedPoint.new(0, -@value, @precision)
end
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
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
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
end
Version data entries
18 entries across 18 versions & 1 rubygems