# * * * * * * * * * * * * * * * * * * * * * * * * * * * * 

# * FusionChartsSave for Ruby on Rails (Jan 21 2008)

# * Requires PNG gem from http://seattlerb.rubyforge.org/

# * PNG is an almost-pure-ruby PNG library. 

# * 

# * sudo gem install -y png

# * 

# * The default location for the imageSaveURL would be:

# * imageSaveURL='/graph/imagesave'

# * * * * * * * * * * * * * * * * * * * * * * * * * * * * 

require 'png'



class GraphController < ApplicationController



def imagesave

  #### Prevent Memory abuse

  maxwidth  = 1024

  maxheight = 1024



  width   = params[:width].to_i

  height  = params[:height].to_i

  bgcolor = params[:bgcolor]

  cdata   = params[:data]



  if width > maxwidth

	return nil

  end

  if height > maxheight

	return nil

  end



  if bgcolor.nil?

	bgcolor = PNG::Color::Background

  else

	bgcolor = PNG::Color.from "0x#{bgcolor.rjust(6,'0')}FF"

  end



  canvas = PNG::Canvas.new width, height, bgcolor



  # Keep count of which row we are on in our loop. Start on the top and draw down.

  ycount = height - 1



  rows = cdata.split(";") 

  

  rows.each do |row|

	### Reset the count for each new row

	ri = 0

	

	pixels = row.split(",") 

	pixels.each do |pixel|

		c,r = pixel.split("_")

	

		if c.length > 0 

			x = 0

			mycolor = PNG::Color.from "0x#{c.rjust(6,'0')}FF"

			while x < r.to_i

				#point function will prevent drawing outside of canvas

				canvas.point(ri + x, ycount, mycolor)

				x += 1

			end

		end

		

		ri += r.to_i

	end

	

	#Move down to the next row

	ycount -= 1

  end



  png = PNG.new canvas

  send_data(png.to_blob, {:type => "content-type:image/png", :stream => true, :filename => "FusionCharts.png"})



end



end

I am trying to save a chart and when I click on the "Save as Image" option on the chart, it runs through the sequence "Capturing Data" until it reaches 100% but then the browser goes on to display the "Image Saving" file (eg. FusionChartsSave.aspx) I set the URL to?

I have tried different image saving files with no success.

An example of what appears in the browser if I use FusionChartsSave.aspx...

<%@ Page Inherits="FusionChartsSave" Src="FusionChartsSave.cs" Debug="true" validateRequest="false" %>

There seems to be an error with the "validaterequest" field.

I think Fusionchart is a great tool and would really appreciate any help.

Thanks in advance. James

could you maybe elaborate on how you go from a FusionChart to this piece of Ruby code?