86 lines
2.8 KiB
Python
86 lines
2.8 KiB
Python
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import numpy as np
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from matplotlib.tri.triangulation import Triangulation
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def triplot(ax, *args, **kwargs):
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"""
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Draw a unstructured triangular grid as lines and/or markers.
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The triangulation to plot can be specified in one of two ways;
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either::
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triplot(triangulation, ...)
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where triangulation is a :class:`matplotlib.tri.Triangulation`
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object, or
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::
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triplot(x, y, ...)
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triplot(x, y, triangles, ...)
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triplot(x, y, triangles=triangles, ...)
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triplot(x, y, mask=mask, ...)
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triplot(x, y, triangles, mask=mask, ...)
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in which case a Triangulation object will be created. See
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:class:`~matplotlib.tri.Triangulation` for a explanation of these
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possibilities.
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The remaining args and kwargs are the same as for
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:meth:`~matplotlib.axes.Axes.plot`.
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Return a list of 2 :class:`~matplotlib.lines.Line2D` containing
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respectively:
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- the lines plotted for triangles edges
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- the markers plotted for triangles 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 = kwargs.copy()
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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[key] = kwargs.get(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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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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