Thanks Eric...This approach also fixed my zooming issue in my other post!!! amb
-----Original Message----- From: Eric Firing [mailto:efir...@hawaii.edu] Sent: Monday, February 16, 2009 4:12 PM To: Lewis, Ambrose J. Cc: matplotlib-users@lists.sourceforge.net Subject: Re: [Matplotlib-users] updating colorbar to match new image data... Lewis, Ambrose J. wrote: > Hi All: > > I'm using the following code to create and display an image with a > colorbar. Later on, I read data from a file and update the image. > > How do I refresh the colorbar to match this new data? Uncommenting the > line in my "ReadFromFile" call below generates a new colorbar. I'd just > like to replace the existing one to match the new data. > > I'm using Python 2.5.2, wx 2.8.7.1, and Matplotlib 0.98.5.2 on win32. > > THANXS > > amb > > > > > ######################################################################## ######################### > > def SetupPlot(self): > > self.figure = Figure() > > self.axes = self.figure.add_subplot(111) > > self.canvas = FigureCanvas(self, -1, self.figure) > > self.data = np.zeros((self.numChans,self.pageSizeSamps)) > > self.myImage = self.axes.imshow(self.data,aspect='auto') > > self.cbar = > self.figure.colorbar(self.myImage,ticks=[0,100],orientation='horizontal' ) > > self.sizer.Add(self.canvas,pos=(1,1),span=(1,2)) > > self.add_toolbar() > > > ######################################################################## ######################### > > def ReadFromFile(self): > > if self.filename=="": > > print "pick a file first!" > > else: > > # bunch of code to read from file via numpy fromfile lives here... > > self.image_data = abs(fftshift(data,axes=[0])) > > self.myImage = > self.axes.imshow(self.image_data,aspect='auto',extent=[self.pageOffset,s elf.pageOffset+self.pageSizeSamps,0,self.numChans]) > > #self.cbar = > self.figure.colorbar(self.myImage,orientation='horizontal') > > self.canvas.draw() The problem is that you are generating a new mappable, so the old colorbar is disconnected from the new image. I haven't tested with an example, but it looks like you should be able to replace the calls in ReadFromFile to imshow with method calls on the original image object. Try using self.myImage.set_data, self.myImage.set_extent, and self.myImage.changed. The latter will tell the colorbar to update itself. Eric ------------------------------------------------------------------------------ Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
