From: Victor Reyes <victor.reyes@...>
Date: 2008-04-01T04:32:21+09:00
Subject: Re: Displaying gruff graphs

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I finally got this working with wx by hard-coding the file path. The graphs
(pie) is displayed, but now I have a small glitch, of course.
The frame is a about 1/4 of what it needs to be, and so I have to resize it
with the mouse.
Perhaps I need to make the frame where the graph is displayed a bit larger.
Is there anyway to make the size of the frame "dynamic" based on the size of
the image to be displayed?
In the mean time I will look in the wx documentation.

Thank you

Victor

On 3/31/08, Victor Reyes <victor.reyes@gmail.com> wrote:
>
> Mark, thank you for your answer and time.
>
> Alex, this is exactly what I am looking for. I am trying to do two things
> at
> the same time: Learning Ruby well and second learning to use gruff so I
> can
> use it at work.
> I copied your sample code where I incorporated the sample gruff code that
> I
> got from the web. When I run it, a wx frame flashes quickly and end. Some
> errors are displayed on the screen.
> Would you mind if I send you directly my piece of code? It is very very
> simple. It only adds about five (5) lines to your sample code.
>
> Thank you for your help.
>
> Victor
>
> PS: The following are the errors:
> C:\$user\vmr\Ruby>ruby rdg00.rb
> c:/ruby/lib/ruby/gems/1.8/gems/gruff-0.3.1/lib/gruff/base.rb:465:in
> `write':
> no encode delegate for this image format `C:/DOCUME~1/REYESV~1
> :ImageMagickError)
>         from c:/ruby/lib/ruby/gems/1.8/gems/gruff-0.3.1
> /lib/gruff/base.rb:465:in
> `write'
>         from rdg00.rb:25:in `on_paint'
>         from c:/ruby/lib/ruby/gems/1.8/gems/wxruby-1.9.5-i386-mswin32
> /lib/wx/classes/evthandler.rb:123:in
> `call'
>         from c:/ruby/lib/ruby/gems/1.8/gems/wxruby-1.9.5-i386-mswin32
> /lib/wx/classes/evthandler.rb:123:in
> `acquire_handler'
>         from c:/ruby/lib/ruby/gems/1.8/gems/wxruby-1.9.5-i386-mswin32
> /lib/wx/classes/window.rb:44:in
> `call'
>         from c:/ruby/lib/ruby/gems/1.8/gems/wxruby-1.9.5-i386-mswin32
> /lib/wx/classes/window.rb:44:in
> `evt_paint'
>         from c:/ruby/lib/ruby/gems/1.8/gems/wxruby-1.9.5-i386-mswin32
> /lib/wx/classes/app.rb:16:in
> `call'
>         from c:/ruby/lib/ruby/gems/1.8/gems/wxruby-1.9.5-i386-mswin32
> /lib/wx/classes/app.rb:16:in
> `process_event'
>         from c:/ruby/lib/ruby/gems/1.8/gems/wxruby-1.9.5-i386-mswin32
> /lib/wx/classes/app.rb:16:in
> `main_loop'
>         from c:/ruby/lib/ruby/gems/1.8/gems/wxruby-1.9.5-i386-mswin32
> /lib/wx/classes/app.rb:16:in
> `run'
>         from rdg00.rb:34
>
>
> On 3/31/08, Alex Fenton <aff28@deleteme.cam.ac.uk> wrote:
> >
>
> > Victor Reyes wrote:
> >
> > > Once a graph is written to disk, g.write("filename.png"), how can it
> be
> > > displayed in Ruby?
> > > I would like to re-create the graph and re-displayed often enough to
> > give
> > > the appearance of "real time"
> >
> >
> > It's not clear whether you meant via a browser or in a desktop app. If
> > you want to show it on the desktop, you'll need some sort of GUI toolkit
> > to display a window then draw the bitmap in it.
> >
> > You have a lot of choices: wxRuby, FXRuby, QT/Ruby, Tk, Ruby/GTK etc
> > etc. They vary widely in suitability for different platforms, ease of
> > installation, features, aesthetics.
> >
> > I use wxRuby b/c it's easy to install (gem install wxruby) and looks
> > good on all the big platforms. A simple 25-line example that would
> > regularly redraw an updated graph is below:
> >
> > hth
> > alex
> > __
> > require 'wx'
> > require 'tempfile'
> >
> > # A frame that draws a regularly updated graph from Gruff every X
> > millisecs
> > class GruffFrame < Wx::Frame
> >    def initialize(refresh_delay = 5000)
> >      super(nil, :title => 'Gruff')
> >      Wx::Timer.every(refresh_delay) { refresh }
> >      evt_paint :on_paint
> >    end
> >
> >    # Writes the gruff graph to a file then reads it back to draw it
> >    def on_paint
> >      # Set up your graph here
> >      graph = Gruff::Lines.new # ....
> >      # Write to a tempfile and read back
> >      tmp = Tempfile.new('gruff')
> >      graph.write(tmp.path)
> >      bmp = Wx::Bitmap.new(tmp.path, Wx::BITMAP_TYPE_PNG)
> >      # Draw it on the Frame
> >      paint do | dc |
> >        dc.draw_bitmap(bmp, 0, 0, false)
> >      end
> >    end
> > end
> >
> > Wx::App.run { GruffFrame.new.show }
> >
> >
>

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