Custom Transitions @ Higher Resolutions

[Draycos Goldaryn]

Greetings,

I'm back and am working on a few projects. One of which will utilize multiple resolutions. I had a script I wrote before that allowed a basic fade to/from black for the resolution, and now I am in the process of modifying it to also allow other transitions. My issue right now is this: I'm trying to define a method where any and all variables are optional. For example:

module foo

  def bar(duration=16, file='', invert=false)

    #some code

  end

end

 

How would I make it so that:

• If I were to call
  foo.bar
  it would run the default fade transition in 16 frames.
  
• If I were to call
  foo.bar(20)
  it would run the default fade transition in 20 frames.
  
• If I were to call
  foo.bar('trans1')
  it would fade to/from trans1.png in the transitions folder in 16 frames
  
• If I were to call
  foo.bar(20, 'trans1')
  it would fade to/from trans1.png in the transitions folder in 20 frames
  
• If I were to call
  foo.bar('trans1', true)
  it would fade to trans1.png in the transitions folder in 8 frames and fade from invert-trans1.png in the transitions folder in 8 frames
  
• and if I were to call
  foo.bar(20, 'trans1', true)
  it would fade to trans1.png in the transitions folder in 10 frames and fade from invert-trans1.png in the transitions folder in 10 frames

Any help would be appreciated. Note, I know how to make it run the transitions themselves, I just want to know how to make the declared variables optional as i have demonstrated.

Thank you,

Draycos Goldaryn

 

[Draycos Goldaryn]

Greetings.

Actually, Google helped me out quite a bit this time....

I found this:

def foo(*my_string)  

  my_string.each do |words|  

    puts words  

  end  

end  

foo('hello','world')  

foo()

I modified it to:

module Foo

  def self.bar(*args)

    i=0

    arg=Array.new

    args.each do |words| 

      arg[i]=words

      i+=1

    end 

    case arg.size

    when 0

      duration,file,invert=16,'',false

    when 1

      if arg[0].integer?

        duration,file,invert=arg[0],'',false

      else

        duration,file,invert=16,arg[0],false

      end

    when 2

      if arg[0].integer?

        duration,file,invert=arg[0],arg[1],false

      else

        duration,file,invert=16,arg[0],arg[1]

      end

    when 3

      duration,file,invert=arg[0],arg[1],arg[2]

    end 

  end

end

Now my question is this: can I clean it up any further?

Thank you,

Draycos Goldaryn

 

[Neo-Bahamut]

module Foo

    def Foo.bar(*args)

        duration = file = invert = nil

        args.each do |i|

            if i.is_a?(Integer)

                duration = i

            elsif i.is_a?(String)

                file = i

            elsif i.is_a?(Boolean)

                invert = i

            end

        end

        duration ||= 16

        file ||= ''

        invert ||= false

    end

end

If you want to do it this way, I think this is the best code possibility.
Ruby 1.9 has better support of that problem:

Foo.bar(:duration => 10, :invert => true)

This can be simulated with a Hash. This way you can have more than one parameter of a class:

module Foo

    def Foo.bar(args_hash)

        duration = args_hash[:duration] || 16

        file = args_hash[:file] || ''

        invert = args_hash[:invert] || false

    end

end

This is the way I would do it.

 

[Draycos Goldaryn]

Thank you very much. This helps me a lot, actually. I will definitely use this.

--Draycos Goldaryn