If you're cool with PNGs, here's some Ruby code to take the FusionCharts data and return it as a PNG. Please let me know if you find any bugs in it, but it's been working well for me so far. I have this saved in my controllers as graph_controller.rb
# * * * * * * * * * * * * * * * * * * * * * * * * * * * *
# * 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
