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PORotation of patches in matplotlib not functioning as expected
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2011-08-19T13:26:58.697
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I am trying to overlay a rotated rectangle onto a matplotlib chart. I have the following code: <pre><code> fig = Figure((3.8, 3.4)) subp = fig.add_subplot(111) fig.axes[0].set_autoscale_on(False) fig.axes[0].set_ylim([float(self.getConfig('GUI', 'chartmin', '-1')),float(self.getConfig('GUI', 'chartmax','4' ))]) fig.axes[0].set_xlim([dataSet[0][2]/1000,dataSet[-1][2]/1000]) fig.axes[0].yaxis.grid(True, which='major') timevals = [] dataPoints = [] #timevals and datapoints are then populated and added to chart correctly, code removed for easier reading subp.plot(timevals, dataPoints) rect = matplotlib.patches.Rectangle( ((dataSet[0][2]/1000)+3,0), width=1.5, height=3, alpha=0.50) rect2 = matplotlib.patches.Rectangle( ((dataSet[0][2]/1000)+3,0), width=1.5, height=3, color="red", alpha=0.50) t_start = subp.transData t = matplotlib.transforms.Affine2D().rotate_deg(-45) t_end = t_start + t rect.set_transform(t_end) subp.add_patch(rect) subp.add_patch(rect2) </code></pre> dataSet[0][2]/1000)+3 gives the start of the charts time series + 3 seconds The chart which is being generated has y values of between 0 and 4 and x values can be anything (it's a force (y) against time (x) plot). The output from the above was intended to be that rect2 (the blue one) would be the same as rect (the red one) but rotated by 45 degrees. What I actually get is this: <a href="http://i.stack.imgur.com/S1f7U.png" rel="nofollow">http://i.stack.imgur.com/S1f7U.png</a> Which is a 45 degree rotation as expected but also a translation, I've tried rotate_deg_around(0,0,-45) but this doesn't seem to help. Can anyone see what I'm doing wrong here or am I misunderstanding how rotate works?
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<python><matplotlib>
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Rotation of patches in matplotlib not functioning as expected
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