Rounding

[morci429]

Hi everyone,

As you all know i'm knew to Sketchup ruby and i can't find this anywhere online.
I have a variable that has a float number and i wanted to round it.

Var = 1.8854523497846
Desired answer Var = 1.9

Also if i can recommend any online sources for Sketchup ruby I’ll be thankful

Thanks

[Didier Bur]

Hi,

Var = 1.8854523497846

Caution: this will create a constant (not very suitable for a variable)

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var = 1.8854523497846

is better

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a.floor # returns 1
a.ceil #returns 2
a.round #returns 2
a.round(1) #should return 1.9, but appears not to work as expected


SU uses Ruby 1.8.6 and .round(x) is new in Ruby 1.9. You'll have to wait for SU9 or code it yourself, or like this:

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def prec(x)
      a=self.to_s.split(".")
      if not a[1]
         return self
      end
      if a[1].length > x-1
         return(a[0] + "." + a[1][0..(x-1)]).to_f
      else
         dif=x-a[1].length
         return(a[0] + "." + a[1] + ("0"*dif)).to_f
      end
   end

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var.prec(6) #returns 1.885452

See http://www.ruby-doc.org/core/ and select the 'Float' class.

For online SketchUp-Ruby docs, see: http://forums.sketchucation.com/viewtopic.php?f=180&t=10142 (well done Dan !)
Hope this helps,

[Dan Rathbun]

@morci429: In reality.. there is no such think as "Sketchup Ruby." There is only Ruby, that that gets loaded by the Sketchup application, and then loads special Google API modules and classes, that extend Ruby so we can work with SKP models.

You need to learn Standard Ruby.. first. And you must have the Reference for the Standard Ruby Modules and Classes.

I suppose SU uses an older version of standard Ruby ?
See http://www.ruby-doc.org/core/ and select the 'Float' class.

Yes, you poined to the current Ruby 1.9.x core.

I have links to the online 1.8.6 and 1.8.7 Core Refs, as well as downloadable offline CHM Refs in this post:
RUBY PROGRAMMING REFERENCES

---

[Dan Rathbun]

How about:

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var = 1.8854523497846
var1 = ((var*10.0).round)/10.0

OR for a singleton Mixin method, save as 'mixin/float_round_to.rb'
(make a subfolder under plugins called 'mixin' and put the file there.):

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module Mixin; end

module Mixin::Round_to
  def round_to(num)
    places = 10.0**num
    return ((self.to_f*places).round)/places
  end
end #module

then use it by extending your variable:
require('mixin/float_round_to.rb')
var.extend(Mixin::Round_to)
var1 = var.round_to(1)
>> 1.9
var3 = var.round_to(3)
>> 1.885
var8=var.round_to(8)
>> 1.88545235

[morci429]

Many thank everyone

Dan Rathbun you are a genies

[TIG]

If you want to round it as output [as astring] then you can use
var_string = sprintf("%.1f", var)
for 1 dp etc