Trying to render a pie chart

[erikcw]

HI all,

I'm trying to use Matplotlib to render a pie chart for a django site
I'm working on.

I can't figure out how to get rid of the grey background, or make the
dimensions square (it's getting stretched).

Here is the code:

def oldchart(reques t):
from PIL import Image as PILImage
from matplotlib.back ends.backend_ag g import FigureCanvasAgg as
FigureCanvas
from matplotlib.figu re import Figure
from StringIO import StringIO
fig = Figure()
canvas = FigureCanvas(fi g)
ax = fig.add_subplot (111)
#ax.plot([1,2,3])
labels = 'Frogs', 'Hogs', 'Dogs', 'Logs'
fracs = [15,30,45, 10]
ax.pie(fracs, labels=labels)
#ax.set_title(' hi mom')
ax.grid(True)
#ax.set_xlabel( 'time')
#ax.set_ylabel( 'volts')
canvas.draw()
size = canvas.get_rend erer().get_canv as_width_height ()
buf=canvas.tost ring_rgb()
im=PILImage.fro mstring('RGB', size, buf, 'raw', 'RGB', 0, 1)
imdata=StringIO ()
im.save(imdata, format='JPEG')
response = HttpResponse(im data.getvalue() , mimetype='image/jpeg')
return response

Thanks for your help!
Erik