From: Maggie  Xiao <mxiao@...>
Date: 2002-07-23T00:36:28+09:00
Subject: Re: How to use "new" method of TkImage

Thank you very much.Now I know why I cannot find any example of how to use
TkImage.

Maggie
----- Original Message -----
From: "ts" <decoux@moulon.inra.fr>
To: "ruby-talk ML" <ruby-talk@ruby-lang.org>
Cc: <ruby-talk@ruby-lang.org>; <ruby-talk@ruby-lang.org>
Sent: Sunday, July 21, 2002 9:27 AM
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
>
>
>
>