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import numpy as np
import pytest
import pyqtgraph as pg
from pyqtgraph.Qt import QtGui
def test_qpainterpathprivate_empty():
# test empty path
qpath = QtGui.QPainterPath()
memory = pg.Qt.internals.get_qpainterpath_element_array(qpath)
assert len(memory) == 0
# test resizing empty path to 0
memory = pg.Qt.internals.get_qpainterpath_element_array(qpath, 0)
assert len(memory) == 0
# test resizing non-empty path to 0
qpath.moveTo(0, 0)
assert qpath.elementCount() == 1
memory = pg.Qt.internals.get_qpainterpath_element_array(qpath, 0)
assert len(memory) == 0
def test_qpainterpathprivate_read():
x0, y0 = 100, 200
size = 100
qpath = QtGui.QPainterPath()
qpath.moveTo(x0, y0)
for idx in range(1, size):
qpath.lineTo(x0 + idx, y0 + idx)
memory = pg.Qt.internals.get_qpainterpath_element_array(qpath)
assert len(memory) == size
assert np.all(memory['x'] == np.arange(x0, x0 + size))
assert np.all(memory['y'] == np.arange(y0, y0 + size))
assert memory['c'][0] == 0
assert np.all(memory['c'][1:] == 1)
def test_qpainterpathprivate_write():
x0, y0 = 100, 200
size = 100
qpath0 = QtGui.QPainterPath()
qpath0.moveTo(x0, y0)
for idx in range(1, size):
qpath0.lineTo(x0 + idx, y0 + idx)
qpath1 = QtGui.QPainterPath()
memory = pg.Qt.internals.get_qpainterpath_element_array(qpath1, size)
assert len(memory) == size
memory['x'] = np.arange(x0, x0 + size)
memory['y'] = np.arange(y0, y0 + size)
memory['c'][:1] = 0
memory['c'][1:] = 1
assert qpath0 == qpath1
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