From: Alex Fenton <alex@...>
Date: 2006-07-26T03:05:08+09:00
Subject: Re: WxRuby: Opening and Displaying PNG images on a window

kpeng1 wrote:
> Hello,
> 
> I am still pretty new to wxwidgets and I am trying to learn as fast as
> possible.

A good place to start is among the samples that come with wxruby and wxruby2. These give short illustrations of how to use a lot of the classes.

> I have been looking at the Image, ImageList and PNGHandler classes, but
> I cannot seem to get anything to work. I cannot even declare a handler.

There is a sample that shows how to load a PNG image. Something like:

class MyFrame < Wx::Frame
  def initialize(title)
    super(nil, -1, title)
    evt_paint { on_paint }
    image = Wx::Image.new('paperclip.png') # load the image from the file
    @bitmap = Wx::Bitmap.new(image) # convert it to a bitmap, ready for drawing with
  end

  def on_paint
    paint do | dc |
      dc.clear
      dc.draw_bitmap(@bitmap, 0, 0, false) # draw the 
    end
  end
end

 
> At this point I just want png thumbnails to display in a window.

Wx::Image seems to have 'resize' and 'rescale' methods among others, though I haven't ever tried these. All the methods that are (potentially) available can be seen at http://www.wxwindows.org/manuals/2.6.3/wx_wximage.html#wximage .

You could also use another package to create thumbnails, eg RMagick.

> Any help or hints would be appreciated.

Another source of help is the wxruby mailing list

cheers
alex