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Legend tuple handler improve #2034

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leejjoon wants to merge 2 commits into from
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Legend tuple handler improve #2034

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f725d06
fix legend_handler.HandlerNpoints.get_xdata of wrong xdescent interpr…
leejjoon May 18, 2013
6f9b1b2
modify legend_hadler.HandlerTuple to display multiple handles side-by…
leejjoon May 18, 2013
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22 changes: 22 additions & 0 deletions examples/pylab_examples/legend_demo5.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,22 @@
import matplotlib.pyplot as plt
from matplotlib.legend_handler import HandlerTuple

fig, (ax1, ax2) = plt.subplots(2, 1)
p1 = ax1.scatter([1],[5], c='r', marker='s', s=100)
p2 = ax1.scatter([3],[2], c='b', marker='o', s=100)

l = ax1.legend([(p1, p2)],['points'], scatterpoints=1,
handler_map={tuple: HandlerTuple(ndivide=0)})

ind = [1,2,3]
pos1 = [1, 3, 2]
neg1 = [2, 1, 4]
width=[0.5, 0.5, 0.5]

rpos1 = ax2.bar(ind, pos1, width=0.5, color='k', label='+1')
rneg1 = ax2.bar(ind, neg1, width=0.5, color='w', hatch='///', label='-1')

l = ax2.legend([(rpos1, rneg1)],['Test'],
handler_map={(rpos1, rneg1): HandlerTuple(ndivide=0, pad=0.)})

plt.show()
34 changes: 28 additions & 6 deletions lib/matplotlib/legend_handler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -135,13 +135,14 @@ def get_xdata(self, legend, xdescent, ydescent, width, height, fontsize):
if numpoints > 1:
# we put some pad here to compensate the size of the
# marker
xdata = np.linspace(-xdescent + self._marker_pad * fontsize,
width - self._marker_pad * fontsize,
pad = self._marker_pad * fontsize
xdata = np.linspace(-xdescent + pad,
-xdescent + width - pad,
numpoints)
xdata_marker = xdata
elif numpoints == 1:
xdata = np.linspace(-xdescent, width, 2)
xdata_marker = [0.5 * width - 0.5 * xdescent]
xdata = np.linspace(-xdescent, -xdescent+width, 2)
xdata_marker = [-xdescent + 0.5 * width]

return xdata, xdata_marker

Expand Down Expand Up @@ -538,19 +539,40 @@ class HandlerTuple(HandlerBase):
"""
Handler for Tuple
"""
def __init__(self, **kwargs):
def __init__(self, ndivide=1, pad=None, **kwargs):
self._ndivide = ndivide
self._pad = pad
HandlerBase.__init__(self, **kwargs)

def create_artists(self, legend, orig_handle,
xdescent, ydescent, width, height, fontsize,
trans):

handler_map = legend.get_legend_handler_map()

if self._ndivide == 0:
ndivide = len(orig_handle)
else:
ndivide = self._ndivide

if self._pad is None:
pad = legend.borderpad * fontsize
else:
pad = self._pad * fontsize

if ndivide > 1:
width = (width - pad*(ndivide - 1)) / ndivide

xds = [xdescent - (width + pad) * i for i in range(ndivide)]
from itertools import cycle
xd_next = cycle(xds).next

a_list = []
for handle1 in orig_handle:
handler = legend.get_legend_handler(handler_map, handle1)
_a_list = handler.create_artists(legend, handle1,
xdescent, ydescent, width, height,
xd_next(), ydescent,
width, height,
fontsize,
trans)
a_list.extend(_a_list)
Expand Down
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