> -----Original Message----- > From: Andrea Gavana [mailto:andrea.gav...@gmail.com] > Sent: Wednesday, September 19, 2012 11:09 AM > To: matplotlib-users@lists.sourceforge.net > Subject: [Matplotlib-users] Image as marker and axes "equal" aspect > ratio > > Hi All, > > I am currently trying to plot 4 points (but they will be more, in > an animated sequence later), and I am trying to use an image as a point > marker. I am using the axes transData transform to get the point > coordinates from the data world to the display world. > > Everything seems to be working OK (i.e., the images are placed > correctly close to the plot points); however, as soon as I try to force > the axes into an "equal" aspect ratio with this command: > > ax.set_aspect('equal') > > Then all the calculations are messed up and the images end up very far > from the plot points. I have tried also the approach mentioned in this > StackOverflow post: > > http://stackoverflow.com/questions/2318288/how-to-use-custom-marker- > with-plot > > But I get the same wrong answer when I set the "equal" aspect ratio for > the axes. > > I am attaching a small sample application which demonstrates the > problem, a small "smiley.png" image needed to run the script and two > plots generated by my script, one with the "equal" aspect ratio and the > other without. > > I appreciate any suggestion, as I feel I am missing something > important... > > Thank you in advance. > > > Andrea. > > "Imagination Is The Only Weapon In The War Against Reality." > http://xoomer.alice.it/infinity77/ > > # ------------------------------------------------------------- # def > ask_mailing_list_support(email): > > if mention_platform_and_version() and include_sample_app(): > send_message(email) > else: > install_malware() > erase_hard_drives() > # ------------------------------------------------------------- #
Andrea, The source of the problem is that the transformation you are using has not been updated to account for your set_aspect call. I played around a little bit, but I'm not sure how to force mpl to update the transform. Perhaps someone else can comment. This is a very fragile way to do things anyway because figimage places the image in screen coordinates and you really would like to place it relative to the axis. Eric ------------------------------------------------------------------------------ Got visibility? Most devs has no idea what their production app looks like. Find out how fast your code is with AppDynamics Lite. http://ad.doubleclick.net/clk;262219671;13503038;y? http://info.appdynamics.com/FreeJavaPerformanceDownload.html _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
