pyqtgraph/tests/graphicsItems/test_NonUniformImage.py

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import numpy as np
import pyqtgraph as pg
from pyqtgraph.Qt import QtTest
from pyqtgraph.graphicsItems.NonUniformImage import NonUniformImage
from tests.image_testing import assertImageApproved
from pyqtgraph.colormap import ColorMap
import pyqtgraph.functions as fn
import pytest
app = pg.mkQApp()
def test_NonUniformImage_scale_dimensions():
x = [1.0, 3.0, 10.0]
y = [1.0, 2.0, 4.0]
X, Y = np.meshgrid(x, y, indexing='ij')
Z = X * Y
for args in [(Z, y, Z), (x, Z, Z)]:
with pytest.raises(Exception) as ex:
NonUniformImage(*args)
assert "x and y must be 1-d arrays." in str(ex)
def test_NonUniformImage_scale_monotonicity():
x = [1.0, 0.0, 10.0]
y = [1.0, 2.0, 4.0]
X, Y = np.meshgrid(x, y, indexing='ij')
Z = X * Y
for args in [(x, y, Z), (y, x, Z)]:
with pytest.raises(Exception) as ex:
NonUniformImage(*args)
assert "The values in x and y must be monotonically increasing." in str(ex)
def test_NonUniformImage_data_dimensions():
x = [1.0, 3.0, 10.0]
y = [1.0, 2.0, 4.0]
with pytest.raises(Exception) as ex:
NonUniformImage(x, y, x)
assert "The length of x and y must match the shape of z." in str(ex)
def test_NonUniformImage_lut():
window = pg.GraphicsLayoutWidget()
viewbox = pg.ViewBox()
window.setCentralWidget(viewbox)
window.resize(200, 200)
window.show()
x = [1.0, 3.0, 10.0]
y = [1.0, 2.0, 4.0]
X, Y = np.meshgrid(x, y, indexing='ij')
Z = X * Y
image = NonUniformImage(x, y, Z, border=fn.mkPen('g'))
viewbox.addItem(image)
lut = pg.HistogramLUTItem()
window.addItem(lut)
image.setLookupTable(lut, autoLevel=True)
h = image.getHistogram()
lut.plot.setData(*h)
QtTest.QTest.qWaitForWindowExposed(window)
QtTest.QTest.qWait(100)
assertImageApproved(window, 'nonuniform_image/lut-3x3')
def test_NonUniformImage_colormap():
window = pg.GraphicsLayoutWidget()
viewbox = pg.ViewBox()
window.setCentralWidget(viewbox)
window.resize(200, 200)
window.show()
x = [1.0, 3.0, 10.0]
y = [1.0, 2.0, 4.0]
X, Y = np.meshgrid(x, y, indexing='ij')
Z = X * Y
Z[:, 0] = [np.NINF, np.NAN, np.PINF]
image = NonUniformImage(x, y, Z, border=fn.mkPen('g'))
cmap = ColorMap(pos=[0.0, 1.0], color=[(0, 0, 0), (255, 255, 255)])
image.setColorMap(cmap)
viewbox.addItem(image)
QtTest.QTest.qWaitForWindowExposed(window)
QtTest.QTest.qWait(100)
assertImageApproved(window, 'nonuniform_image/colormap-3x3')