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#!/usr/bin/env python
"""Configure a plot by grabbing the matplotlib backend
This example demonstrates the use of setp and getp, which is a
typical matlab/pylab way to set properties of objects
setp(handler, 'something', value) or getp(handler [, 'something'])
will call set_something or get_something from handler
getp with only the handler argument will show full property list
"""
__author__ = 'Rolv Erlend Bredesen <rolv@simula.no'
from scitools.std import *
def _pylab_patch_alpha(alpha=0.2):
"""Makes patches (e.g. fill objects) located in the current axes
transparent with given opacity coefficient."""
pylab = get_backend()
setp = pylab.setp
getp = pylab.getp
ax = pylab.gca()
for child in getp(ax, 'children'):
if not isinstance(child, pylab.matplotlib.patches.Polygon):
continue
if __debug__:
print 'Old alpha value:', getp(child, 'alpha'), 'new:', alpha
setp(child, 'alpha', alpha)
if __name__ == '__main__':
if backend == 'matplotlib':
# override some properties for nicer plots:
plt._g.rcParams.update({'font.size' : 10,
'axes.labelsize' : 10,
'text.fontsize' : 10,
'xtick.labelsize' : 8,
'ytick.labelsize' : 8,
})
x = linspace(0.0, 10., 101)
y1 = sin(x)
y2 = cos(3*x)
# fix fill boundaries so we color between zero-line and values
x_ = concatenate([x[:], x[::-1]])
y1_ = concatenate([y1[:], 0*y1[:]])
y2_ = concatenate([y2[:], 0*y2[:]])
subplot(2,1,1)
fill(y1_, 'b', y2_, 'g', x=x_, grid=True, title='no transparency')
subplot(2,1,2)
fill(y1_, 'b', y2_, 'g', x=x_, alpha=0.2, title='transparent fill')
if backend == 'matplotlib':
# Set alpha on patches
_pylab_patch_alpha(0.3)
# Don't use normal hardcopy after an update in backend
plt._g.savefig('transparent_fill.png')
raw_input('Press Return key to quit: ')
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