python - set_aspect() and coordinate transforms in matplotlib -

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i run seems bug in matplotlib (version 1.4.3)/pyplot when attempting draw line between subplots: after setting set_aspect("equal"), appears relevant coordinate transformation functions (transdata) don't update. execute code below ax.set_aspect("equal") uncommented see difference.

import matplotlib.pyplot plt import matplotlib mpl      f, (ax1, ax2) = plt.subplots(1, 2, sharey='all', sharex='all')  ax in (ax1, ax2):     # ax.set_aspect("equal")     ax.set_ylim([-.2, 1.2])     ax.set_xlim([-.2, 1.2])          # http://stackoverflow.com/questions/17543359/drawing-lines-between-two-plots-in-matplotlib  transfigure = f.transfigure.inverted()  coord1 = transfigure.transform(ax1.transdata.transform([0,0])) coord2 = transfigure.transform(ax2.transdata.transform([1,0]))  line = mpl.lines.line2d((coord1[0],coord2[0]),(coord1[1],coord2[1]),                     transform=f.transfigure) f.lines.append(line)  plt.show()

the relevant images here (1) , here (2).

the problem you're having set_aspect isn't applied until after draw operation. when you're making line, limits haven't been changed. notice different x limits in second image, while line in same place: line drawn though x limits didn't change, because hadn't been changed yet, , wouldn't changed until plt.show(). solution add plt.draw() after set_aspect, before start working on transforms. following code this, print statements make clear issue limits , transforms @ different times:

import matplotlib.pyplot plt import matplotlib mpl      f, (ax1, ax2) = plt.subplots(1, 2, sharey='all', sharex='all')  ax in (ax1, ax2):     ax.set_ylim([-.2, 1.2])     ax.set_xlim([-0.2, 1.2])    transfigure = f.transfigure.inverted()  print ax1.get_xlim(), ax1.transdata.transform([0,0])  ax in (ax1, ax2):     ax.set_aspect('equal')  print ax1.get_xlim(), ax1.transdata.transform([0,0])  plt.draw()  print ax1.get_xlim(), ax1.transdata.transform([0,0])  coord1 = transfigure.transform(ax1.transdata.transform([0,0])) coord2 = transfigure.transform(ax2.transdata.transform([1,0]))  line = mpl.lines.line2d((coord1[0],coord2[0]),(coord1[1],coord2[1]),                     transform=f.transfigure) f.lines.append(line)  plt.show()

this point should added docstring set_aspect, , i'll see if can that. it's not bug: aspect can't determined until after plot ready drawn.


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