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Adjustments to contour.py so that levels are set accordingly to input vmin and vmax, if provided, so color bar works correctly. #2176

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Adjustments to contour.py so that levels are set accordingly to input vmin and vmax, if provided, so color bar works correctly. #2176

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f8eacb6
Added lines to _contour_args() to look for vmin/vmax input arguments …
kthyng Jun 28, 2013
d806c1a
Additionally checked for the case when the desired vmax or vmin are o…
kthyng Jun 28, 2013
f627dc7
switch calls for vmin and vmax through kwargs in _contour_args() to j…
kthyng Jun 28, 2013
3c01e5b
Added to test_contour.py for colorbar behavior
kthyng Jun 29, 2013
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Additionally checked for the case when the desired vmax or vmin are o… 
…utside the range of the data. In this case, the contour plot, if extend for the appropriate direction is also chosen, will appropriately reflect the desired range.
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@kthyng
kthyng committed Jun 28, 2013
commit d806c1a803f62c261dbfdc41c2b1da80bdc9f7b6
17 changes: 12 additions & 5 deletions lib/matplotlib/contour.py
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,7 @@
import matplotlib.patches as mpatches
import matplotlib.texmanager as texmanager
import matplotlib.transforms as mtrans
import pdb

# Import needed for adding manual selection capability to clabel
from matplotlib.blocking_input import BlockingContourLabeler
Expand Down Expand Up @@ -1196,7 +1197,7 @@ def _process_levels(self):
# want to leave the original levels attribute unchanged.
# (Colorbar needs this even for line contours.)
self._levels = list(self.levels)

pdb.set_trace()
if self.extend in ('both', 'min'):
self._levels.insert(0, min(self.levels[0], self.zmin) - 1)
if self.extend in ('both', 'max'):
Expand Down Expand Up @@ -1495,18 +1496,24 @@ def _contour_args(self, args, kwargs):
(fn, fn))

# Check for vmin and vmax values and max out z values accordingly
# want zmax and zmin to be able to be outside data range, according to input vmin/vmax
if 'vmax' in kwargs:
vmax = kwargs.pop('vmax')
vmax = kwargs['vmax']
ind = z > vmax
z[ind] = vmax
self.zmax = kwargs.pop('vmax')
else:
self.zmax = ma.maximum(z)
if 'vmin' in kwargs:
vmin = kwargs.pop('vmin')
vmin = kwargs['vmin']
ind = z < vmin
z[ind] = vmin
self.zmin = kwargs.pop('vmin')
else:
self.zmin = ma.minimum(z)

z = ma.masked_invalid(z, copy=False)
self.zmax = ma.maximum(z)
self.zmin = ma.minimum(z)

if self.logscale and self.zmin <= 0:
z = ma.masked_where(z <= 0, z)
warnings.warn('Log scale: values of z <= 0 have been masked')
Expand Down