When using the 'bar' plot command, unit information is lost when changing the
units for a given axis. The attached script
demonstrates this.
This is not the case for line plots because of the use of Line2D's 'recache'
method.
--James Evans
"""
plot using a variety of cm vs inches conversions. The example shows
how default unit instrospection works (ax1), how various keywords can
be used to set the x and y units to override the defaults (ax2, ax3,
ax4) and how one can set the xlimits using scalars (ax3, current units
assumed) or units (conversions applied to get the numbers to current
units)
"""
from basic_units import cm, inch
from pylab import figure, show, nx
cms = cm *nx.arange(0, 10, 2)
fig = figure()
ax1 = fig.add_subplot(2,2,1)
ax1.bar(cms, cms)
ax2 = fig.add_subplot(2,2,2)
ax2.bar(cms, cms, xunits=cm, yunits=inch)
ax3 = fig.add_subplot(2,2,3)
ax3.bar(cms, cms, xunits=inch, yunits=cm)
ax3.set_xlim(3, 6) # scalars are interpreted in current units
ax4 = fig.add_subplot(2,2,4)
ax4.bar(cms, cms, xunits=inch, yunits=inch)
#fig.savefig('simple_conversion_plot.png')
ax4.set_xlim(3*cm, 6*cm) # cm are converted to inches
show()
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