Hi --
I have imagemagick and rmagick installed so that I can produce images from code to a file. Can anyone direct me to where I can find guidance on how to have those images included on a web page (e.g., <img src="my_dynamically_generated_image") instead of having them sent to a file? Thanks for any input.
... doug
Take a look at the sparklines gem to see all the goodness, but this fragment from the generated sparklines_controller should get you started:
send_data( Sparklines.plot( ary, params ), :disposition => 'inline', :type => 'image/png', :filename => "spark_#{params[:type]}.png" )
The first arg to send_data is the blob that is your image, the rest just tell Rails how to format the headers.
You can also look at using data: urls which work like this (but I think IE had troubles so I pulled the data: url out of my own code):
# prefer to use a "data" URL scheme as described in {RFC 2397}[http://www.ietf.org/rfc/rfc2397.txt\] data_url = "data:image/png;base64,#{Base64.encode64(Sparklines.plot(results,options))}" tag = %(<img src="#{data_url}" #{attributes}/>)
# respect some limits noted in RFC 2397 since the data: url is supposed to be 'short' data_url.length <= 1024 && tag.length <= 2100 ? tag : %(<img src="#{ url_for options }" #{attributes}/>)
-Rob
Rob Biedenharn http://agileconsultingllc.com Rob@AgileConsultingLLC.com +1 513-295-4739 Skype: rob.biedenharn
Wow!! I didn't know this was going to be that involved. I guess that's why I was unable to find anything on google. Thanks for the input.
... doug