From: ts <decoux@...>
Date: 2002-07-22T00:27:35+09:00
Subject: Re: How to use "new" method of TkImage

>>>>> "M" == Maggie Xiao <mxiao@ee.ualberta.ca> writes:

>> Thanks,I know how to create a photoimage, but I don't know how to use 
M> Image.new;can it create a new image?According to the Rdoc, should be 
M> "new(keys=nil)".Thanks again.

 The best is to do like ruby, i.e. to create a subclass of TkImage to
 define @type and then call super. For example, TkPhotoImage do

   class TkPhotoImage < TkImage
      def initialize(*args)
         @type = 'photo'
         super
      end
      # etc
   end

 There is only one problem : in tcl/tk it exist *only* 2 types of Image
 defined by tk :
   * 'photo' defined by TkPhotoImage 
   * 'bitmap' defined by TkBitmapImage

 This mean that if you want to use an Image, you must fatally use
 TkImagePhoto or TkBitmapImage. TkImage is useless for you except if you
 use an tcl/tk extensions which define its own image type.


Guy Decoux