On Fri, Dec 9, 2011 at 2:13 PM, Daniel Hyams <dhy...@gmail.com> wrote:
> I can't tell if I'm misusing collections here, or if there is a bug.
> Anyway, what I'm trying to do is keep track of a group of rectangles
> generated from a bar plot. Instead of letting there be a large number of
> artists added to the axes, I wanted to just group them into a collection
> and add the collection instead. As in the code below:
>
> #!/usr/bin/env python
> import numpy
> import matplotlib.pyplot as plt
> import matplotlib.collections
>
> # just generate some data to plot
> x = numpy.linspace(0.0,2.0*numpy.pi,10)
> y = numpy.sin(x)
>
> # plot
> axes = plt.gca()
> bars = plt.bar(x,y,color='red',width=0.1)
>
> # strip out all of the newly inserted rectangles
> for b in bars: b.remove()
>
> # and create a collection for plotting the rectangles instead.
> coll = matplotlib.collections.PatchCollection(bars)
>
> axes.artists.append(coll)
>
> plt.xlim(0.0,2.0*numpy.pi)
> plt.grid(True)
> plt.show()
>
> This appears to work at first blush, but if you resize the plot, you can
> tell that the rectangles are just fixed in their location now. I tried
> messing around with setting the transform for the new collection object
> "coll" in different ways, to no avail. Any suggestions welcome ;)
>
> --
> Daniel Hyams
> dhy...@gmail.com
>
> try transOffset:
>>> coll = matplotlib.collections.PatchCollection(bars,
transOffset=axes.transData)
I've always found this a bit clumsy, but I think it's the standard way to
do it.
-Tony
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