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Backport PR #21051 on branch v3.5.x (set_dashes does not support offset=None anymore.) #21069

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Merged
merged 1 commit into from
Sep 14, 2021
Merged

Backport PR #21051 on branch v3.5.x (set_dashes does not support offset=None anymore.) #21069

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6 changes: 2 additions & 4 deletions lib/matplotlib/backend_bases.py
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Original file line number Diff line number Diff line change
Expand Up @@ -914,15 +914,13 @@ def set_dashes(self, dash_offset, dash_list):

Parameters
----------
dash_offset : float or None
dash_offset : float
The offset (usually 0).
dash_list : array-like or None
The on-off sequence as points.
The on-off sequence as points. None specifies a solid line.

Notes
-----
``(None, None)`` specifies a solid line.

See p. 107 of to PostScript `blue book`_ for more info.

.. _blue book: https://www-cdf.fnal.gov/offline/PostScript/BLUEBOOK.PDF
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22 changes: 1 addition & 21 deletions src/py_converters.cpp
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Expand Up @@ -212,33 +212,13 @@ int convert_dashes(PyObject *dashobj, void *dashesp)
{
Dashes *dashes = (Dashes *)dashesp;

if (dashobj == NULL && dashobj == Py_None) {
return 1;
}

PyObject *dash_offset_obj = NULL;
double dash_offset = 0.0;
PyObject *dashes_seq = NULL;

if (!PyArg_ParseTuple(dashobj, "OO:dashes", &dash_offset_obj, &dashes_seq)) {
if (!PyArg_ParseTuple(dashobj, "dO:dashes", &dash_offset, &dashes_seq)) {
return 0;
}

if (dash_offset_obj != Py_None) {
dash_offset = PyFloat_AsDouble(dash_offset_obj);
if (PyErr_Occurred()) {
return 0;
}
} else {
if (PyErr_WarnEx(PyExc_FutureWarning,
"Passing the dash offset as None is deprecated since "
"Matplotlib 3.3 and will be removed in Matplotlib 3.5; "
"pass it as zero instead.",
1)) {
return 0;
}
}

if (dashes_seq == Py_None) {
return 1;
}
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