/usr/lib/python3/dist-packages/matplotlib/tri/triplot.py is in python3-matplotlib 1.3.1-1ubuntu5.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 | from matplotlib.cbook import ls_mapper
from matplotlib.patches import PathPatch
from matplotlib.path import Path
from matplotlib.tri.triangulation import Triangulation
import numpy as np
def triplot(ax, *args, **kwargs):
"""
Draw a unstructured triangular grid as lines and/or markers.
The triangulation to plot can be specified in one of two ways;
either::
triplot(triangulation, ...)
where triangulation is a :class:`matplotlib.tri.Triangulation`
object, or
::
triplot(x, y, ...)
triplot(x, y, triangles, ...)
triplot(x, y, triangles=triangles, ...)
triplot(x, y, mask=mask, ...)
triplot(x, y, triangles, mask=mask, ...)
in which case a Triangulation object will be created. See
:class:`~matplotlib.tri.Triangulation` for a explanation of these
possibilities.
The remaining args and kwargs are the same as for
:meth:`~matplotlib.axes.Axes.plot`.
**Example:**
.. plot:: mpl_examples/pylab_examples/triplot_demo.py
"""
import matplotlib.axes
tri, args, kwargs = Triangulation.get_from_args_and_kwargs(*args, **kwargs)
x = tri.x
y = tri.y
edges = tri.edges
# If draw both lines and markers at the same time, e.g.
# ax.plot(x[edges].T, y[edges].T, *args, **kwargs)
# then the markers are drawn more than once which is incorrect if alpha<1.
# Hence draw lines and markers separately.
# Decode plot format string, e.g., 'ro-'
fmt = ''
if len(args) > 0:
fmt = args[0]
linestyle, marker, color = matplotlib.axes._process_plot_format(fmt)
# Draw lines without markers, if lines are required.
if linestyle is not None and linestyle is not 'None':
kw = kwargs.copy()
kw.pop('marker', None) # Ignore marker if set.
kw['linestyle'] = ls_mapper[linestyle]
kw['edgecolor'] = color
kw['facecolor'] = None
vertices = np.column_stack((x[edges].flatten(), y[edges].flatten()))
codes = ([Path.MOVETO] + [Path.LINETO])*len(edges)
path = Path(vertices, codes)
pathpatch = PathPatch(path, **kw)
ax.add_patch(pathpatch)
# Draw markers without lines.
# Should avoid drawing markers for points that are not in any triangle?
kwargs['linestyle'] = ''
ax.plot(x, y, *args, **kwargs)
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