Rails - Apr 2008 - Model to jpg

Hi,

I need to create a jpg representation of data in the model and embed
that into an svg doc in base64 8-P

From what I''ve seen around I could:

1- Use RMagick to create the jpg image
2- Endode it into Base64
3- Generate the svg reply

The svg generation I''ve done already (pure svg). But I''ll
start now to
see how the image can be generated and encoded into Base64.

Any good pointers to good info?
I''ll posting how I manage to do it.

Thanks.
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Hi,

Ok so if anyone is interested here''s how I managed to do it.

1- Install RMagick
2- In the controller where you want to generate the pic do something 
like:

  # GET /pics/1
  # GET /pics/1.xml
  def show
    @pic = Pic.find(params[:id])

    Magick::RVG.dpi = 90

    rvg = Magick::RVG.new(10.cm, 3.cm).viewbox(0,0,1000,300) do |canvas|
    canvas.background_fill = ''black''
    canvas.text(250, 150, @pic.name
).styles(:font_family=>''Verdana'',
:font_size=>55, :fill=>''white'')
    canvas.circle(5, 250, 170).styles(:fill=>''red'')
    canvas.rect(997, 297).styles(:fill=>''none'',
:stroke=>''blue'')
    end

    rvg.draw.write(''text01.jpg'')

    before = Magick::Image.read("text01.jpg").first
    blob = before.to_blob
    #puts blob

    @base64image = Base64.encode64(blob)
    puts "base64"
    puts @base64image

    respond_to do |format|
      format.html # show.html.erb
      format.svg  { render :action => "svg.rhtml", :layout =>
false }
      format.xml  { render :xml => @pic }
    end
  end

  # GET /pics/new
  # GET /pics/new.xml
  def new
    @pic = Pic.new

    respond_to do |format|
      format.html # new.html.erb
      format.xml  { render :xml => @pic }
    end
  end

3- Now you can generate an SVG image of the @base64image variable. That 
image contains the name of a picture stored in the DB:

<svg xmlns="http://www.w3.org/2000/svg"
  xmlns:xlink="http://www.w3.org/1999/xlink"
  viewBox="0 0 10 10">

<image xlink:href="data:image/png;base64,<%= @base64image %>"
width="10" height="5"/>

</svg>

------------

I think that was all I needed to do. So now when I go to 
http://127.0.0.1.:3000/pics/3.svg I can see a generated pic with the 
name of that pic.

Extra- The trick to be able to serve SVG is explained in the next 
thread:
http://www.ruby-forum.com/topic/149851#new

------------

So basically I can now create a graphical representation of the model.
It was easy, if anyone has any optimization ideas to the process above 
feel free to suggest.

Cheers!





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