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1import numpy as np
2from matplotlib.tri.triangulation import Triangulation
5def triplot(ax, *args, **kwargs):
6 """
7 Draw a unstructured triangular grid as lines and/or markers.
9 The triangulation to plot can be specified in one of two ways;
10 either::
12 triplot(triangulation, ...)
14 where triangulation is a :class:`matplotlib.tri.Triangulation`
15 object, or
17 ::
19 triplot(x, y, ...)
20 triplot(x, y, triangles, ...)
21 triplot(x, y, triangles=triangles, ...)
22 triplot(x, y, mask=mask, ...)
23 triplot(x, y, triangles, mask=mask, ...)
25 in which case a Triangulation object will be created. See
26 :class:`~matplotlib.tri.Triangulation` for a explanation of these
27 possibilities.
29 The remaining args and kwargs are the same as for
30 :meth:`~matplotlib.axes.Axes.plot`.
32 Return a list of 2 :class:`~matplotlib.lines.Line2D` containing
33 respectively:
35 - the lines plotted for triangles edges
36 - the markers plotted for triangles nodes
37 """
38 import matplotlib.axes
40 tri, args, kwargs = Triangulation.get_from_args_and_kwargs(*args, **kwargs)
41 x, y, edges = (tri.x, tri.y, tri.edges)
43 # Decode plot format string, e.g., 'ro-'
44 fmt = args[0] if args else ""
45 linestyle, marker, color = matplotlib.axes._base._process_plot_format(fmt)
47 # Insert plot format string into a copy of kwargs (kwargs values prevail).
48 kw = kwargs.copy()
49 for key, val in zip(('linestyle', 'marker', 'color'),
50 (linestyle, marker, color)):
51 if val is not None:
52 kw[key] = kwargs.get(key, val)
54 # Draw lines without markers.
55 # Note 1: If we drew markers here, most markers would be drawn more than
56 # once as they belong to several edges.
57 # Note 2: We insert nan values in the flattened edges arrays rather than
58 # plotting directly (triang.x[edges].T, triang.y[edges].T)
59 # as it considerably speeds-up code execution.
60 linestyle = kw['linestyle']
61 kw_lines = {
62 **kw,
63 'marker': 'None', # No marker to draw.
64 'zorder': kw.get('zorder', 1), # Path default zorder is used.
65 }
66 if linestyle not in [None, 'None', '', ' ']:
67 tri_lines_x = np.insert(x[edges], 2, np.nan, axis=1)
68 tri_lines_y = np.insert(y[edges], 2, np.nan, axis=1)
69 tri_lines = ax.plot(tri_lines_x.ravel(), tri_lines_y.ravel(),
70 **kw_lines)
71 else:
72 tri_lines = ax.plot([], [], **kw_lines)
74 # Draw markers separately.
75 marker = kw['marker']
76 kw_markers = {
77 **kw,
78 'linestyle': 'None', # No line to draw.
79 }
80 if marker not in [None, 'None', '', ' ']:
81 tri_markers = ax.plot(x, y, **kw_markers)
82 else:
83 tri_markers = ax.plot([], [], **kw_markers)
85 return tri_lines + tri_markers