[Borges-users] Dynamically creating images with Borges

[Michael Neumann]

On Mon, May 03, 2004 at 03:29:30PM -0700, Eric Hodel wrote:
> Michael Neumann (mneumann at ntecs.de) wrote:
> 
> > On Tue, May 04, 2004 at 12:24:34AM +0400, ??????? ???????? wrote:
> > > >>data = File.open('plasm.jpg') {|f| f.binmode; f.read} # we have some 
> > > >>binary data
> > > >>r.image r.url_for_document(data,"image/jpeg") # we make the image's URL 
> > > >>point to this data, with a mime-type
> > > >
> > > >Hm, this way the image is the same for all sessions, isn't it? And the
> > > >URL will not be reclaimed (it will stay forever).
> > > 
> > > Instead of opening a file, you can fill 'data' with binary data for 
> > > the image in some other way. (Capture the output from an SVG renderer, 
> > > for example.) The image will be different between different calls to 
> > > Controller#render_on (i.e. between different page renders). You can 
> > > use some session-specific data to build the image from it, etc. Isn't 
> > > this what you want? (This way, you don't really need the proc - you 
> > > generate the image data when the page loads, and store it for later 
> > > retrieval with #url_for_document.)
> > 
> > Yes, that's exactly what I want.
> > 
> > Is there an easy way to access any extra arguments given at the end of
> > the URL?
> > 
> > For now I've solved it this way: 
> > 
> >   class Borges::Session
> >     attr_reader :request
> >     alias old_handle_request handle_request
> >     def handle_request(req)
> >       @request = req
> >       old_handle_request(req)
> >     end
> >   end
> >    
> > 
> > and then inside render_on, I access it via "session.request.fields". 
> 
> Would client-side image maps work for you?  These can be easily
> added to the Renderer.

Not really, as I want the x,y positions of a mouse click. But it's
working now (I can now "draw" images within a webbrowser :-). 

> > But I noticed that Request#fields seems to be wrong. In my case it
> > contains "?4?x,y".  The "?4" is part of the anchor link (the ?x,y is the
> > x and y coordinates of the mouse click).
> 
> What browser are you using? I wonder if it is not joining the
> portions of the GET args correctly.

I tried Konqueror and Mozilla. Both show the same.

Regards,

  Michael