From: Daniel Nugent <nugend@...>
Date: 2005-06-29T15:22:14+09:00
Subject: Re: What do you want to see in a Sparklines Library?

I'll bet it's my ISP blocking access from outside the subnet.  I'm
sorry about that.

I'm not quite sure how to let you guys see what it does, I'll email
the source if you'd like it, or you can look at Joe's Python version
(sans my two additions): .http://bitworking.org/projects/sparklines/

Carl: I'm not sure if what you're doing there is any different from
what's in the script right now.

On 6/27/05, Ezra Zygmuntowicz <ezra@yakima-herald.com> wrote:
> I cannot access your server either. I have tried both times you
> posted it and it would just time out multiple times.
> -Ezra
> On Jun 27, 2005, at 1:24 PM, Daniel Nugent wrote:
> 
> > I'm doing that right now actually, I just want to add the ability to
> > do data: URIs, which should be pretty easy I think.
> >
> > It's strange that you can't access my server Adam, is anyone else
> > having that problem?
> >
> > On 6/27/05, Carl Youngblood <carl.youngblood@gmail.com> wrote:
> >
> >> One thing that would make sparklines a lot more universally
> >> accessible to
> >> all browsers would be to get rid of the dependency on data urls.
> >> The basic
> >> idea is to return the proper MIME type to the browser and then
> >> just start
> >> spitting out the raw binary data of the PNG.
> >>
> >> Here is an example:
> >>
> >> #!/usr/bin/ruby
> >>
> >> require 'base64'
> >> require 'cgi'
> >> require 'zlib'
> >>
> >> def build_png_chunk(type,data)
> >> to_check = type + data
> >> return [data.length].pack("N") + to_check +
> >> [Zlib.crc32(to_check)].pack("N")
> >> end
> >>
> >> def build_png(image_rows)
> >> header = [137, 80, 78, 71, 13, 10, 26, 10].pack("C*")
> >> raw_data = image_rows.map { |row| [0] + row }.flatten.pack("C*")
> >> ihdr_data = [image_rows.first.length,
> >> image_rows.length,
> >> 8,2,0,0,0].pack("NNCCCCC")
> >> ihdr = build_png_chunk("IHDR", ihdr_data)
> >> idat = build_png_chunk("IDAT", Zlib::Deflate.deflate(raw_data))
> >> iend = build_png_chunk("IEND", "")
> >>
> >> return header + ihdr + idat + iend
> >> end
> >>
> >> def bumpspark(results)
> >> white, red, grey = [0xFF,0xFF,0xFF], [0,0,0xFF], [0x99,0x99,0x99]
> >> rows = results.inject([]) do |ary, r|
> >> ary << [white]*15 << [white]*15
> >> ary.last[r/9,4] = [(r > 50 and red or grey)]*4
> >> ary
> >> end.transpose
> >> return build_png(rows)
> >> end
> >>
> >> def send_to_browser(results)
> >> puts "Content-type: image/png"
> >> puts "Expires: Wed, 11 Nov 1998 11:11:11 GMT"
> >> puts "Cache-Control: no-cache"
> >> puts "Cache-Control: must-revalidate"
> >> puts
> >> print bumpspark(results)
> >> end
> >>
> >> send_to_browser (0..22).map { rand 100 }
> >>
> >>
> >> See this in action at the following URL:
> >>
> >> http://youngbloods.org/sparkline.cgi
> >>
> >> Carl
> >>
> >>
> >>
> >
> >
> > --
> > -Dan Nugent
> >
> >
> 
> -Ezra Zygmuntowicz
> Yakima Herald-Republic
> WebMaster
> 509-577-7732
> ezra@yakima-herald.com
> 
> 
> 


-- 
-Dan Nugent