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arrayToQPath can handle empty paths (#1920)

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* Fixes #1888

* Improve test coverage of arrayToQPath

* Use early exit to solve empty path instead of slice manipulation

* address codeql qualms: Unused import, uneven tuple
This commit is contained in:
ntjess 2021-08-02 13:18:25 -04:00 committed by GitHub
parent d0961cc320
commit e18d1fb1f2
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2 changed files with 81 additions and 42 deletions
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2
pyqtgraph/functions.py
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@ -1925,6 +1925,8 @@ def arrayToQPath(x, y, connect='all', finiteCheck=True):
path = QtGui.QPainterPath()
n = x.shape[0]
if n == 0:
return path
connect_array = None
if isinstance(connect, np.ndarray):

55
tests/test_functions.py
View File

@ -1,7 +1,6 @@
# -*- coding: utf-8 -*-
from collections import OrderedDict
from copy import deepcopy
from contextlib import suppress
from pyqtgraph.functions import arrayToQPath, eq
import numpy as np
@ -264,20 +263,44 @@ def test_CIELab_reconversion():
MoveToElement = pg.QtGui.QPainterPath.ElementType.MoveToElement
LineToElement = pg.QtGui.QPainterPath.ElementType.LineToElement
_dtypes = []
for bits in 32, 64:
for base in 'int', 'float', 'uint':
_dtypes.append(f'{base}{bits}')
_dtypes.extend(['uint8', 'uint16'])
def _handle_underflow(dtype, *elements):
"""Wrapper around path description which converts underflow into proper points"""
out = []
for el in elements:
newElement = [el[0]]
for ii in range(1, 3):
coord = el[ii]
if coord < 0:
coord = np.array(coord, dtype=dtype)
newElement.append(float(coord))
out.append(tuple(newElement))
return out
@pytest.mark.parametrize(
"xs, ys, connect, expected", [
*(
(
np.arange(6), np.arange(0, -6, step=-1), 'all', (
np.arange(6, dtype=dtype), np.arange(0, -6, step=-1, dtype=dtype), 'all',
_handle_underflow(dtype,
(MoveToElement, 0.0, 0.0),
(LineToElement, 1.0, -1.0),
(LineToElement, 2.0, -2.0),
(LineToElement, 3.0, -3.0),
(LineToElement, 4.0, -4.0),
(LineToElement, 5.0, -5.0),
(LineToElement, 5.0, -5.0)
)
) for dtype in _dtypes
),
*(
(
np.arange(6), np.arange(0, -6, step=-1), 'pairs', (
np.arange(6, dtype=dtype), np.arange(0, -6, step=-1, dtype=dtype), 'pairs',
_handle_underflow(dtype,
(MoveToElement, 0.0, 0.0),
(LineToElement, 1.0, -1.0),
(MoveToElement, 2.0, -2.0),
@ -285,16 +308,21 @@ LineToElement = pg.QtGui.QPainterPath.ElementType.LineToElement
(MoveToElement, 4.0, -4.0),
(LineToElement, 5.0, -5.0),
)
) for dtype in _dtypes
),
*(
(
np.arange(5), np.arange(0, -5, step=-1), 'pairs', (
np.arange(5, dtype=dtype), np.arange(0, -5, step=-1, dtype=dtype), 'pairs',
_handle_underflow(dtype,
(MoveToElement, 0.0, 0.0),
(LineToElement, 1.0, -1.0),
(MoveToElement, 2.0, -2.0),
(LineToElement, 3.0, -3.0),
(MoveToElement, 4.0, -4.0)
)
) for dtype in _dtypes
),
# NaN types don't coerce to integers, don't test for all types since that doesn't make sense
(
np.arange(5), np.array([0, -1, np.NaN, -3, -4]), 'finite', (
(MoveToElement, 0.0, 0.0),
@ -313,24 +341,33 @@ LineToElement = pg.QtGui.QPainterPath.ElementType.LineToElement
(LineToElement, 4.0, -4.0)
)
),
*(
(
np.arange(5), np.arange(0, -5, step=-1), np.array([0, 1, 0, 1, 0]), (
np.arange(5, dtype=dtype), np.arange(0, -5, step=-1, dtype=dtype), np.array([0, 1, 0, 1, 0]),
_handle_underflow(dtype,
(MoveToElement, 0.0, 0.0),
(MoveToElement, 1.0, -1.0),
(LineToElement, 2.0, -2.0),
(MoveToElement, 3.0, -3.0),
(LineToElement, 4.0, -4.0)
)
)
) for dtype in _dtypes
),
# Empty path with all types of connection
*(
(
np.arange(0), np.arange(0, dtype=dtype), conn, ()
) for conn in ['all', 'pairs', 'finite', np.array([])] for dtype in _dtypes
),
]
)
def test_arrayToQPath(xs, ys, connect, expected):
path = arrayToQPath(xs, ys, connect=connect)
element = None
for i in range(path.elementCount()):
with suppress(NameError):
# nan elements add two line-segments, for simplicity of test config
# we can ignore the second segment
if (eq(element.x, np.nan) or eq(element.y, np.nan)):
if element is not None and (eq(element.x, np.nan) or eq(element.y, np.nan)):
continue
element = path.elementAt(i)
assert eq(expected[i], (element.type, element.x, element.y))