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Description
Edit: Note that this issue is also still present with Qt5Agg and matplotlib 3.0.1
Showing a figure with Qt4Agg backend changes the figure size. This is observed with Windows 8.1, python 2.7, matplotlib 2.1.
import matplotlibmatplotlib.use("Qt4Agg")import matplotlib.pyplot as pltfig, ax = plt.subplots()ax.plot([1,2,4])def update(evt): print(fig.get_size_inches()) cid = fig.canvas.mpl_connect("key_press_event", update)print(fig.get_size_inches())plt.show()The original figure is[ 6.4 4.8]. After the figure is drawn (and in this case you press a key), it is only[ 6.4 4.78].
One could argue that this is only a small amount, but saving the figure from within the event loop now gives a different figure size of the saved figure. To make this more obvious, consider the following code which saves a new image after each press of space.
import matplotlibmatplotlib.use("Qt4Agg")import matplotlib.pyplot as pltimport numpy as npclass NextPlotter(object): def __init__(self, fig, func, n): self.__dict__.update(locals()) self.i = 0 self.cid = self.fig.canvas.mpl_connect("key_press_event", self.adv) def adv(self, evt): if evt.key == " " and self.i < self.n: self.func(self.i) self.i+=1 elif self.i >= self.n: plt.close("all")# Create datapos = range(8)scatterdata = np.random.normal(0, 5, size=(50,len(pos)))#Create plotfig, ax = plt.subplots()ax.axis([-10,10,-10,10])scatter = ax.scatter([], [], c="crimson", s=60)# define updating functiondef update(i): print("++ update " + str(i)) scatter.set_offsets(np.c_[pos,scatterdata[i,:]]) fig.canvas.draw() print(fig.get_size_inches()) plt.savefig("plot_{i}.png".format(i=i)) print(fig.get_size_inches())# instantiate NextPlotter; press <space> to advance to the next image c = NextPlotter(fig, update, len(scatterdata))plt.show()resulting in
Is this a problem of PyQt4? Can anyone reproduce this outside of Windows 8?