Hi Bob,
Le 17/12/2012 19:09, Bob Dowling a écrit :
>
> I am plotting a polar graph with some negative values of r.
> Everything goes well until I try to use rgrids(). Am I doing
> something wrong?
I just noticed that calling rgrids *after* plotting works nicely for me:
subplot(111, polar=True)
polar(t, r)
rgrids([2,4,6])
However, calling rgrids before plotting indeed leads to a weird
situation where only half of the curve is plotted. After digging in the
source code, this may relate to the `use_rmin` parameter in the
PolarTransform class init (in matplotlib.projections.polar)
In the tranform_non_affine method I see
# line 40-42:
if self._axis is not None:
if self._use_rmin:
rmin = self._axis.viewLim.ymin
# [...]
if rmin != 0:
r = r - rmin
mask = r < 0
x[:] = np.where(mask, np.nan, r * np.cos(t))
y[:] = np.where(mask, np.nan, r * np.sin(t))
else:
x[:] = r * np.cos(t)
y[:] = r * np.sin(t)
Maybe this the code behind the masking of half your curve, but I don't
know more.
Best,
Pierre
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