#15903: Allow implicit (and contour, region?) plots to have legend
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Reporter: kcrisman | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.2
Component: graphics | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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See [https://groups.google.com/forum/#!topic/sage-support/YLKxkk1H04g this
sage-support thread].
{{{
var('x y')
P = contour_plot(x^2+y^2==1,(x,-1,1),(y,-1,1),plot_points=150,
contours=(0,0), fill=False, cmap=["blue"],legend_label='test')
print P.legend()
P.legend(True)
print P.legend()
print P[0].options()['legend_label']
show(P)
}}}
We see that legends aren't set.
In fact,
[http://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.contour the
mpl contour api] seems to confirm that we shouldn't be trying to label
contour plots with legends. (Which makes sense, since they have their own
labeling mechanism). However, for implicit plots, this might cause a
problem. A workaround like at the bottom of
[http://matplotlib.org/examples/pylab_examples/contourf_hatching.html this
example]
{{{
artists, labels = cs.legend_elements()
plt.legend(artists, labels, handleheight=2)
}}}
which extracts the labels from the contour legend and then puts them into
the usual legend might be a solution.
--
Ticket URL: <http://trac.sagemath.org/ticket/15903>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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