In ruby-tk
Do you need a canvas to show a picture or is it ok to
show a picture on a frame?
When should you use a canvas?
···
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Posted via http://www.ruby-forum.com/.
Mer Gilmartin wrote:
In ruby-tk
Do you need a canvas to show a picture or is it ok to
show a picture on a frame?
When should you use a canvas?
Ok. canvas is needed to display picture.
but i still would like to hear peoples comments about
canvases and frames to understand them better.
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Posted via http://www.ruby-forum.com/\.
Message-ID: <183e167ef809521c53ea5d9bded5682e@ruby-forum.com>
In ruby-tk
Do you need a canvas to show a picture or is it ok to
show a picture on a frame?
If you want to show a picture only, you don't need a canvas widget.
Please create a TkPhotoImage object and assign it to `image' option
of a TkLabel object (or a widget which has `image' option).
Current standard Tcl/Tk suuports only GIF and PPM/PGM formats.
If you want to treat other formats (JPEG, BMP, and so on), you need
to use `TkImg' extension (ActiveTcl package already includes it).
Current Ruby/Tk supports TkImg extension.
When should you use a canvas?
There are many cases.
* When needs a drawing field (and save it by Postscrpt format).
* When want to handle widgets or canvas items (Line, Oval, and so on)
by coordinates.
Please see the example "Ruby/Tk widget demo" which is included in
Ruby source archive.
* When want to assign bindings to some parts of a picture
(e.g. a tree picture which has clickable branches).
* When want to create a scrollable frame.
Please see the example "ext/tk/sample/scrollframe.rb" on Ruby
source tree.
# On Ruby/TkORCA, a canvas widget takes place of a pseudo window
# manager for slave Ruby/Tk applications.
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From: Mer Gilmartin <merrua@yahoo.co.uk>
Subject: Newbie question Canvas or frame
Date: Tue, 10 Oct 2006 19:19:28 +0900
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Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
Hidetoshi NAGAI wrote:
If you want to show a picture only, you don't need a canvas widget.
Please create a TkPhotoImage object and assign it to `image' option
of a TkLabel object (or a widget which has `image' option).
Ah. Im using TkPhotoImage with canvas and a frame. Is this ok ?
And the `TkImg' extension, do I add that with require "TKImg".
I have active tcl on the computer.
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Message-ID: <6cc68269b8f4191b460819f3e29422b6@ruby-forum.com>
Ah. Im using TkPhotoImage with canvas and a frame. Is this ok ?
That is OK, if that is what you want. 
And the `TkImg' extension, do I add that with require "TKImg".
I have active tcl on the computer.
Please use "require 'tkextlib/tkimg'".
If your Ruby/Tk loads libraries of ActiveTcl, that will work.
···
From: Mer Gilmartin <merrua@yahoo.co.uk>
Subject: Re: Newbie question Canvas or frame
Date: Tue, 10 Oct 2006 23:20:40 +0900
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Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
Thank You!
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