Re: [Matplotlib-users] Blitting with qt4
Oops forgot to change subject. On 12/15/11 10:02 AM, David Hoese wrote: Eric, I installed mpl from git (git clone git://github.com/matplotlib/matplotlib.git, unless I was suppose to use one of the branches) and same problem. I looked at my code again and thought there should be a canvas.draw() before calling c.copy_from_bbox(a.bbox), but still the same problem. However, I did have it work the first time I added c.draw() and used the git mpl, and by work I mean that everything stayed visible on the figure. When people start coming in to my work I'll ask them to run my sample code and see what happens. It almost seems like mpl is handling the window activation event funny, is there an easy way to print out the callbacks being used by a mpl figure? For now, I will subclass QApplication, and implement notify() to print out events as they come in, but still...this is just weird. Thanks. -Dave On 12/14/11 10:30 PM, Eric Firing wrote: David, It works for me on linux with mpl from git. I haven't tried to figure it out, but it is conceivable that the problem you are seeing was fixed with this: commit b624546ae60dc5878e75a32f41a160d383548b8f Author: Eric Firingefir...@hawaii.edu Date: Tue Oct 18 08:06:21 2011 -1000 backend_qt4agg: draw() immediately calls FigureCanvasAgg.draw() This is the latest in a series of modifications to the Qt4Agg drawing strategy going back several years. It simplifies the code and should solve the problem introduced in 6938b0025; that is, delaying the Agg draw operation until the paintEvent breaks code expecting that draw operation to have occurred immediately. The problem was reported here: http://sourceforge.net/mailarchive/message.php?msg_id=28245744 Eric -- 10 Tips for Better Server Consolidation Server virtualization is being driven by many needs. But none more important than the need to reduce IT complexity while improving strategic productivity. Learn More! http://www.accelacomm.com/jaw/sdnl/114/51507609/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Blitting with qt4
Eric, Good news I think I got it to work. So using the same code I sent you originally, I applied the following changes: 1. Install matplotlib from git (this did fix things that I wasn't noticing) 2. Add c.draw() before c.copy_from_bbox 3. Copy f.bbox instead of a.bbox (I think this makes sense since I want it to hold on to the title,ticks, and labels, a.bbox is only the content inside the axis rectangle) 4. Restore f_bbox, blit f.bbox. ...and it seems to work. The git version of mpl did fix this, although restoring just the a.bbox was only keeping the axis rectangle so it made it look like even worse of a bug. Using the new version I noticed this and then started using f.bbox which seems to work the way I want it. Now, my final question is: Is this actually doing what I want performance-wise. When I blit just f.bbox, is it really only repainting the updated line or is it redrawing most of the figure? If you need a copy of the new version of my test code let me know. Thanks for any more clarity/help you can give. -Dave P.S. Is there a book or tutorial or website where I can learn more about how the rendering/painting of stuff like this works. For example, if I could better understand why your bug fix was needed. On 12/15/11 10:04 AM, David Hoese wrote: Oops forgot to change subject. On 12/15/11 10:02 AM, David Hoese wrote: Eric, I installed mpl from git (git clone git://github.com/matplotlib/matplotlib.git, unless I was suppose to use one of the branches) and same problem. I looked at my code again and thought there should be a canvas.draw() before calling c.copy_from_bbox(a.bbox), but still the same problem. However, I did have it work the first time I added c.draw() and used the git mpl, and by work I mean that everything stayed visible on the figure. When people start coming in to my work I'll ask them to run my sample code and see what happens. It almost seems like mpl is handling the window activation event funny, is there an easy way to print out the callbacks being used by a mpl figure? For now, I will subclass QApplication, and implement notify() to print out events as they come in, but still...this is just weird. Thanks. -Dave On 12/14/11 10:30 PM, Eric Firing wrote: David, It works for me on linux with mpl from git. I haven't tried to figure it out, but it is conceivable that the problem you are seeing was fixed with this: commit b624546ae60dc5878e75a32f41a160d383548b8f Author: Eric Firingefir...@hawaii.edu Date: Tue Oct 18 08:06:21 2011 -1000 backend_qt4agg: draw() immediately calls FigureCanvasAgg.draw() This is the latest in a series of modifications to the Qt4Agg drawing strategy going back several years. It simplifies the code and should solve the problem introduced in 6938b0025; that is, delaying the Agg draw operation until the paintEvent breaks code expecting that draw operation to have occurred immediately. The problem was reported here: http://sourceforge.net/mailarchive/message.php?msg_id=28245744 Eric -- 10 Tips for Better Server Consolidation Server virtualization is being driven by many needs. But none more important than the need to reduce IT complexity while improving strategic productivity. Learn More! http://www.accelacomm.com/jaw/sdnl/114/51507609/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] Blitting with qt4
Does anyone know if using the blit method from FigureCanvasQTAgg is not fully supported? I'm having a problem where I'm animating a plot using the blit method and I click on/activate the window the background of the figure disappears (axes and line stay visible). I'm not sure if this is just me (Mac OS X Lion, Qt4 4.8.6, Matplotlib 1.1.0), but the following code reproduces the error: ### from PyQt4 import QtGui,QtCore from matplotlib.figure import Figure from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg from time import sleep app = QtGui.QApplication([ ]) f = Figure() c = FigureCanvasQTAgg(f) a = f.add_subplot(111) a.set_title(A Title) bbox = c.copy_from_bbox(a.bbox) lines = a.plot([1,2,3],[1,2,3]) c.draw() c.show() wait = raw_input(Press a key to continue...) def update(i): a.lines[0].set_ydata([i,1,i]) print a.bbox.bounds c.restore_region(bbox, bbox=a.bbox) a.draw_artist(a.lines[0]) c.blit(a.bbox) sleep(1) app.processEvents() for i in range(20): update(i) wait = raw_input(Press a key to continue...) ### To see the problem, run the code, watch the plot to make sure its updating properly, then click on the window to put it in focus/activate it. I'm hoping that I'm just doing something stupid and its an easy fix. It seems to work until I click on the window (in Mac OS X Lion Terminal the window is opened in the background and the Terminal window stays in focus). Thanks for any help. -Dave -- Cloud Computing - Latest Buzzword or a Glimpse of the Future? This paper surveys cloud computing today: What are the benefits? Why are businesses embracing it? What are its payoffs and pitfalls? http://www.accelacomm.com/jaw/sdnl/114/51425149/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Blitting with qt4
On 12/14/2011 12:31 PM, David Hoese wrote: Does anyone know if using the blit method from FigureCanvasQTAgg is not fully supported? I'm having a problem where I'm animating a plot using the blit method and I click on/activate the window the background of the figure disappears (axes and line stay visible). I'm not sure if this is just me (Mac OS X Lion, Qt4 4.8.6, Matplotlib 1.1.0), but the following code reproduces the error: David, It works for me on linux with mpl from git. I haven't tried to figure it out, but it is conceivable that the problem you are seeing was fixed with this: commit b624546ae60dc5878e75a32f41a160d383548b8f Author: Eric Firing efir...@hawaii.edu Date: Tue Oct 18 08:06:21 2011 -1000 backend_qt4agg: draw() immediately calls FigureCanvasAgg.draw() This is the latest in a series of modifications to the Qt4Agg drawing strategy going back several years. It simplifies the code and should solve the problem introduced in 6938b0025; that is, delaying the Agg draw operation until the paintEvent breaks code expecting that draw operation to have occurred immediately. The problem was reported here: http://sourceforge.net/mailarchive/message.php?msg_id=28245744 Eric ### from PyQt4 import QtGui,QtCore from matplotlib.figure import Figure from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg from time import sleep app = QtGui.QApplication([ ]) f = Figure() c = FigureCanvasQTAgg(f) a = f.add_subplot(111) a.set_title(A Title) bbox = c.copy_from_bbox(a.bbox) lines = a.plot([1,2,3],[1,2,3]) c.draw() c.show() wait = raw_input(Press a key to continue...) def update(i): a.lines[0].set_ydata([i,1,i]) print a.bbox.bounds c.restore_region(bbox, bbox=a.bbox) a.draw_artist(a.lines[0]) c.blit(a.bbox) sleep(1) app.processEvents() for i in range(20): update(i) wait = raw_input(Press a key to continue...) ### To see the problem, run the code, watch the plot to make sure its updating properly, then click on the window to put it in focus/activate it. I'm hoping that I'm just doing something stupid and its an easy fix. It seems to work until I click on the window (in Mac OS X Lion Terminal the window is opened in the background and the Terminal window stays in focus). Thanks for any help. -Dave -- Cloud Computing - Latest Buzzword or a Glimpse of the Future? This paper surveys cloud computing today: What are the benefits? Why are businesses embracing it? What are its payoffs and pitfalls? http://www.accelacomm.com/jaw/sdnl/114/51425149/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users -- Cloud Computing - Latest Buzzword or a Glimpse of the Future? This paper surveys cloud computing today: What are the benefits? Why are businesses embracing it? What are its payoffs and pitfalls? http://www.accelacomm.com/jaw/sdnl/114/51425149/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
