用于转换Ruby中物理单位(千克,磅)的库？

Question

我知道Rails有一些很好的日期和时间管理助手.是否有一个已经完成的项目由标准单元及其转换组成或包含干净的DSL？任何带有助手的项目都可以在两个系统的基本长度和重量单位之间进行转换.谢谢!

Answer 1

哇,这些比我预期的要多得多.以下是我认为的完整列表,按字母顺序排列,示例用法从文档中删除.我还注意到,如果我无法让它们在本地运行.

1. 方士

   require 'alchemist'
   Alchemist.setup
   8.miles.to.meters
   10.kilometers + 1.mile # 11.609344 kilometers
   

2. 测量

   这个看起来已经过时了,最后一次提交是5年前的事,而且它似乎并没有在1.9.3上运行.

   include Measurement::Length
   Inch.new(12).to_centimeters # => #<Measurement::Length::Centimeter:0x173c2b4 @units=30.48>
   

3. 物理学单位

   require "phys/units"
   Q = Phys::Quantity
   U = Phys::Unit
   
   Q[1.23,'km'] + Q[4.56,'m']    #=> Phys::Quantity[1.23456,'km']
   Q[123,'mile'] / Q[2,'hr']     #=> Phys::Quantity[61,'mile/hr']
   Q[61,'miles/hr'].want('m/s')  #=> Phys::Quantity[27.26944,'m/s']
   Q[1.0,'are'] == Q[10,'m']**2  #=> true
   

4. 数量

   请注意,这个说明它在README中没有生产就绪.

   require 'quantity/all'
   1.meter                                         #=> 1 meter
   1.meter.to_feet                                 #=> 3.28083... foot
   c = 299792458.meters / 1.second                 #=> 299792458 meter/second
   
   newton = 1.meter * 1.kilogram / 1.second**2     #=> 1 meter*kilogram/second^2
   newton.to_feet                                  #=> 3.28083989501312 foot*kilogram/second^2
   newton.convert(:feet)                                   #=> 3.28083989501312 foot*kilogram/second^2
   jerk_newton = newton / 1.second                         #=> 1 meter*kilogram/second^3
   jerk_newton * 1.second == newton                        #=> true
   

5. SY

   请参阅Boris Stitnickey的回答.

6. 红宝石测量

   require 'ruby-measurement'
   
   measurement = Measurement.parse('3 feet')  # => 3.0 ft.
   measurement.convert_to(:yards)             # => 1.0 yd.
   measurement.convert_to(:in)                # => 36.0 in.
   measurement.convert_to(:inches)            # => 36.0 in.
   
   measurement1 = Measurement.parse('3 feet') # => 3.0 ft.
   measurement2 = Measurement.parse('6 inch') # => 6.0 in.
   measurement1 + measurement2                # => 3.5 ft.
   

7. 红宝石单位

   require 'ruby-units'
   
   unit = Unit("mm")                # unit only (defaults to a scalar of 1)
   unit = Unit("1 mm")              # create a simple unit
   unit = Unit("1 kg*m^2/s^2")      # complex unit
   
   unit1 =~ unit2                   # true if units are compatible
   unit1.compatible?(unit2)         # true if units are compatible
   
   unit1 = unit >> "ft"             # convert to 'feet'
   unit3 = unit1 + unit2            # resulting object will have the units of unit1
   
   unit1 === unit2                  # true if units and quantity are the same, even if 'equivalent' by <=>
   unit.convert_to('ft')            # convert
   (unit1 + unit2).convert_to('ft') # converts result to 'ft'
   

8. Ruby的单位

   require 'units'
   
   three_meters = 3.meters
   two_meters = 2.m
   one_inch = 1.inch
   
   3.meters.to_inches # => 118.1103 inch
   10.inches.to_mm    # => 254.0 millimeter
   

9. Unitwise

   require 'unitwise/ext'
   
   1.yard == (1.foot * 3)                       # => true
   
   1.quart < 1.liter                            # => true
   
   2.meter + 3.inch - 1.yard                    # => <Unitwise::Measurement 1.1618 meter>
   
   1.convert_to('kg.m2/s2') == 1.joule          # => true
   
   (20.kg * 9.8.convert_to('m/s2')).to_pound_force # => <Unitwise::Measurement 44.06255284754326 pound_force>
   
   (300.horsepower * 60.second).to_calorie      # => <Unitwise::Measurement 3208077.8414151203 calorie>
   

10. 货车/股

    像另一张海报一样,我无法正常工作.但是,您可以看到JörgWMittag的使用答案.

作为Unitwise的作者,可能很明显它是我最喜欢的群体.不过,我鼓励你至少检查一下.

Answer 2

尝试令人敬畏的炼金术士.

......