87 lines
3.0 KiB
Python
87 lines
3.0 KiB
Python
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import numpy as np
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from matplotlib.tri._triangulation import Triangulation
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import matplotlib.cbook as cbook
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import matplotlib.lines as mlines
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def triplot(ax, *args, **kwargs):
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"""
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Draw an unstructured triangular grid as lines and/or markers.
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Call signatures::
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triplot(triangulation, ...)
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triplot(x, y, [triangles], *, [mask=mask], ...)
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The triangular grid can be specified either by passing a `.Triangulation`
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object as the first parameter, or by passing the points *x*, *y* and
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optionally the *triangles* and a *mask*. If neither of *triangulation* or
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*triangles* are given, the triangulation is calculated on the fly.
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Parameters
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----------
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triangulation : `.Triangulation`
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An already created triangular grid.
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x, y, triangles, mask
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Parameters defining the triangular grid. See `.Triangulation`.
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This is mutually exclusive with specifying *triangulation*.
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other_parameters
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All other args and kwargs are forwarded to `~.Axes.plot`.
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Returns
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-------
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lines : `~matplotlib.lines.Line2D`
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The drawn triangles edges.
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markers : `~matplotlib.lines.Line2D`
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The drawn marker nodes.
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"""
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import matplotlib.axes
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tri, args, kwargs = Triangulation.get_from_args_and_kwargs(*args, **kwargs)
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x, y, edges = (tri.x, tri.y, tri.edges)
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# Decode plot format string, e.g., 'ro-'
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fmt = args[0] if args else ""
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linestyle, marker, color = matplotlib.axes._base._process_plot_format(fmt)
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# Insert plot format string into a copy of kwargs (kwargs values prevail).
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kw = cbook.normalize_kwargs(kwargs, mlines.Line2D)
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for key, val in zip(('linestyle', 'marker', 'color'),
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(linestyle, marker, color)):
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if val is not None:
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kw.setdefault(key, val)
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# Draw lines without markers.
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# Note 1: If we drew markers here, most markers would be drawn more than
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# once as they belong to several edges.
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# Note 2: We insert nan values in the flattened edges arrays rather than
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# plotting directly (triang.x[edges].T, triang.y[edges].T)
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# as it considerably speeds-up code execution.
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linestyle = kw['linestyle']
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kw_lines = {
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**kw,
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'marker': 'None', # No marker to draw.
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'zorder': kw.get('zorder', 1), # Path default zorder is used.
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}
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if linestyle not in [None, 'None', '', ' ']:
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tri_lines_x = np.insert(x[edges], 2, np.nan, axis=1)
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tri_lines_y = np.insert(y[edges], 2, np.nan, axis=1)
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tri_lines = ax.plot(tri_lines_x.ravel(), tri_lines_y.ravel(),
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**kw_lines)
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else:
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tri_lines = ax.plot([], [], **kw_lines)
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# Draw markers separately.
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marker = kw['marker']
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kw_markers = {
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**kw,
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'linestyle': 'None', # No line to draw.
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}
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kw_markers.pop('label', None)
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if marker not in [None, 'None', '', ' ']:
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tri_markers = ax.plot(x, y, **kw_markers)
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else:
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tri_markers = ax.plot([], [], **kw_markers)
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return tri_lines + tri_markers
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