python - Can't get canvas to draw fig in matplotlib -

from basic understanding using matplotlib store desired plt in 'fig' , can draw said 'fig' using canvas.draw() operation. if case shouldn't have problems since do, going on , what's logic behind getting on canvas. also, end goal display plot within qtpy window. results far can window , canvas show canvas shows empty. have been looking @ http://matplotlib.sourceforge.net/users/artists.html , feel i'm doing isn't entirely wrong, perhaps i'm overlooking nuance. here code i'm referencing:

def drawthis(self):          self.axes.clear()         self.axes.grid(self.grid_cb.ischecked())         self.fig = plt.figure(figsize=(11,7),dpi=self.dpi)         file = filelist[selfile]         valid = [scolumn]         matrix = np.loadtxt(file, skiprows=1, usecols=valid)         colcount = np.loadtxt(file, dtype=object)         totalcols = colcount.shape[1]          kdedata = np.array(matrix)         datarange = (decimal(max(abs(kdedata))) / 10).quantize(1, rounding=round_up) * 10          gkde = stats.gaussian_kde(kdedata)         ind = np.linspace(-int(datarange), int(datarange), len(kdedata) * ssamples)         kdepdf = gkde.evaluate(ind)          ##plot histogram of sample         plt.hist(kdedata, len(kdedata), normed=1, alpha=0.20)         ##plot data generating density         plt.plot(ind, stats.norm.pdf(ind), 'r', linewidth=0.8, label='dgp normal')         ##plot estimated density         plt.plot(ind, kdepdf, 'g', linewidth=0.8, label='kde')         plt.title('kde '+ str(namelist[selfile]))         plt.legend()          self.fig.canvas.draw() 

i don't have experience matplotlib, in looking @ code, wonder if use of pyplot correct? way code looks me, using pyplot generate data (which dont keep return values of), , plot it, yet think not operating on axis instance.

an example of how have seen matplotlib being used can found here: segfault using matplotlib pyqt .. directly creating pyqt4 figurecanvas , plotting directly axis instance.

it seems pyplot.plot() method can take figure , axis parameter tell instance use. wonder if not using axis, since can't see in example how create axis itself. take @ @ docs here

my guess might try doing this:

plt.plot(ind, kdepdf, 'g', axis=self.axis, linewidth=0.8, label='kde') 

or, maybe confirm have createe self.axis using self.axis = plt.axis(), or try doing plotting directly axis instance?