Hi Eric, All, On 21 September 2012 15:46, Moore, Eric (NIH/NIDDK) [F] wrote: >> -----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... >> > 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.
Thank you for your answer and for taking the time to play with the sample I posted. I know that using figimage is not exactly the best way to go, but I can only think of two other approaches: 1) Use imshow: from the documentation, it appears to me that you can't place an image wherever you want, and I was unable to find any example on how to use imshow to place multiple images in a specific place inside the axes; 2) Use scatter: again, from the docs it seems that scatter supports symbols, mathtext, paths and regular polygons, but no images... I may of course be wrong about the above statements, and again I welcome any suggestion you may have. Thank you. Andrea. "Imagination Is The Only Weapon In The War Against Reality." http://xoomer.alice.it/infinity77/ ------------------------------------------------------------------------------ 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
