[Matplotlib-users] Chart plotting blank?

[Erik W. <er...@er...>]

Hi,

I'm trying to plot a barchart for use in a django site.  It's creating
a blank chart image though.(attached).

What am I doing wrong?

from pylab import *
def chart(request):
    from PIL import Image as PILImage
    from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas
    from matplotlib.figure import Figure
    from StringIO import StringIO
    fig = Figure(figsize=(6,4))
    canvas = FigureCanvas(fig)
    ax = fig.add_subplot(111)
    #from pylab import *
    N = 7
    menMeans = (20, 35, 30, 35, 27, 21, 60)
    ind = arange(N)  # the x locations for the groups
    #print ind
    width = 0.35       # the width of the bars
    ax = bar(ind, menMeans, width, color='b')
    #ylabel('Time')
    title('Time In Minutes - Last 7 Days')
    xticks(ind+width, ('Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', '*') )
    fig.set_facecolor('w')
    canvas.draw()
    size = canvas.get_renderer().get_canvas_width_height()
    buf=canvas.tostring_rgb()
    im=PILImage.fromstring('RGB', size, buf, 'raw', 'RGB', 0, 1)
    imdata=StringIO()
    im.save(imdata, format='PNG')
    response = HttpResponse(imdata.getvalue(), mimetype='image/png')
    return response


Thanks!
Erik