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from importlib.metadata import version
import pytest
import pyqtgraph as pg
from pyqtgraph.exporters import MatplotlibExporter
pytest.importorskip("matplotlib")
from packaging.version import Version, parse
app = pg.mkQApp()
# see https://github.com/matplotlib/matplotlib/pull/24172
if (
pg.Qt.QT_LIB == "PySide6"
and parse(pg.Qt.PySide6.__version__) > Version('6.4')
and parse(version('matplotlib')) < Version('3.6.2')
):
pytest.skip(
"matplotlib + PySide6 6.4 bug",
allow_module_level=True
)
def test_MatplotlibExporter():
plt = pg.PlotWidget()
plt.show()
# curve item
plt.plot([0, 1, 2], [0, 1, 2])
# scatter item
plt.plot([0, 1, 2], [1, 2, 3], pen=None, symbolBrush='r')
# curve + scatter
plt.plot([0, 1, 2], [2, 3, 4], pen='k', symbolBrush='r')
exp = MatplotlibExporter(plt.getPlotItem())
exp.export()
def test_MatplotlibExporter_nonplotitem():
# attempting to export something other than a PlotItem raises an exception
plt = pg.PlotWidget()
plt.show()
plt.plot([0, 1, 2], [2, 3, 4])
exp = MatplotlibExporter(plt.getPlotItem().getViewBox())
with pytest.raises(Exception):
exp.export()
@pytest.mark.parametrize('scale', [1e10, 1e-9])
def test_MatplotlibExporter_siscale(scale):
# coarse test to verify that plot data is scaled before export when
# autoSIPrefix is in effect (so mpl doesn't add its own multiplier label)
plt = pg.PlotWidget()
plt.show()
plt.plot([0, 1, 2], [(i+1)*scale for i in range(3)])
# set the label so autoSIPrefix works
plt.setLabel('left', 'magnitude')
exp = MatplotlibExporter(plt.getPlotItem())
exp.export()
mpw = MatplotlibExporter.windows[-1]
fig = mpw.getFigure()
ymin, ymax = fig.axes[0].get_ylim()
if scale < 1:
assert ymax > scale
else:
assert ymax < scale
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