wxruby users - Nov 2003 - wxImageHandler type?

Hiya, I was trying to figure out how to display PNG files using
wxWindows/wxRuby.  Google turned up a few things, mainly discussing
the wxImageHandler class and it''s children, etc, but there seems to 
be no mention of them in the wxRuby source.

Are they there, and I missed them, or are they just not there?

If there not there, is there a quick and dirty way to get them in?
It seems like the build does some automatic stuff, but I''m not really
clear on which bits are generated and which bits a are handcoded.

If someone could point out a few examples of the generated stuff, I
might have a go at adding the wxImageHandler stuff etc.

H

You need to call wxInitAllImageHandlers (init_all_image_handlers) first. 
You''ll need the latest version from CVS, as the 0.1.0 version
doesn''t
support it.

Nick

Hunter Kelly wrote:
>Hiya, I was trying to figure out how to display PNG files using
>wxWindows/wxRuby.  Google turned up a few things, mainly discussing
>the wxImageHandler class and it''s children, etc, but there seems to
>be no mention of them in the wxRuby source.
>
>Are they there, and I missed them, or are they just not there?
>
>If there not there, is there a quick and dirty way to get them in?
>It seems like the build does some automatic stuff, but I''m not
really
>clear on which bits are generated and which bits a are handcoded.
>
>If someone could point out a few examples of the generated stuff, I
>might have a go at adding the wxImageHandler stuff etc.
>
>H
>
>
>_______________________________________________
>wxruby-users mailing list
>wxruby-users@rubyforge.org
>http://rubyforge.org/mailman/listinfo/wxruby-users
>
>
>
>  
>

Hunter Kelly wrote:
> Hiya, I was trying to figure out how to display PNG files using
> wxWindows/wxRuby.  Google turned up a few things, mainly discussing
> the wxImageHandler class and it''s children, etc, but there seems
to
> be no mention of them in the wxRuby source.
> 
> Are they there, and I missed them, or are they just not there?
Greetings!

As Nick said, part of the answer is grabbing the latest snapshot of 
wxruby, and calling Wx::init_all_image_handlers

It''s not immediately obvious, but you can grab a nightly snapshot 
tarball off rubyforge if you don''t have CVS handy. Go to the CVS tab of
our project, choose the upper link at the right side (Browse using 
ViewCVS), and then choose "Download tarball". Note that it will expand
into a directory named ''wxruby'' by default, so make sure
you''re in the
right place before un-tarring it.

Anyway, I was curious how this stuff works, so I wrote the following 
little program (starting with nothing.rb as a skeleton) that will 
display a .png file in a window. It assumes you have a file named 
paperclip.png in the current directory.

By the way, thanks to Nick Kral for implementing the really cool
''paint''
method. It''s exactly what I wanted here!

############################
require ''wxruby''

class MyFrame < Wx::Frame
   def initialize(title)
     super(nil, -1, title)
     evt_paint do onPaint end
     image = Wx::Image.new(''paperclip.png'')
     @bitmap = Wx::Bitmap.new(image)
   end

   def onPaint
     puts("onPaint begin")
     paint do | dc |
	dc.clear
	dc.draw_bitmap(@bitmap, 0, 0, false)
     end
     puts("onPaint end")
   end
end

class ImagesApp < Wx::App
   def OnInit
     frame = MyFrame.new("Minimal wxRuby App")
	frame.show
   end
end

Wx::init_all_image_handlers
a = ImagesApp.new
a.main_loop()


############################
> If someone could point out a few examples of the generated stuff, I
> might have a go at adding the wxImageHandler stuff etc.
No need for that one, but if you want a class that doesn''t already 
exist, you can try creating a .t file for it. I described the process 
recently in this email message:
http://rubyforge.org/pipermail/wxruby-users/2003-November/000116.html

Cheers,

Kevin

Hiya, I was trying to figure out how to display PNG files using
wxWindows/wxRuby.  Google turned up a few things, mainly discussing
the wxImageHandler class and it''s children, etc, but there seems to 
be no mention of them in the wxRuby source.

Are they there, and I missed them, or are they just not there?

If there not there, is there a quick and dirty way to get them in?
It seems like the build does some automatic stuff, but I''m not really
clear on which bits are generated and which bits a are handcoded.

If someone could point out a few examples of the generated stuff, I
might have a go at adding the wxImageHandler stuff etc.

H