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"""
HistogramLUTWidget test:
Tests the creation of a HistogramLUTWidget.
"""
import itertools
import numpy as np
import pyqtgraph as pg
from pyqtgraph.Qt import QtWidgets
def testHistogramLUTWidget():
pg.mkQApp()
win = QtWidgets.QMainWindow()
win.show()
cw = QtWidgets.QWidget()
win.setCentralWidget(cw)
l = QtWidgets.QGridLayout()
cw.setLayout(l)
l.setSpacing(0)
v = pg.GraphicsView()
vb = pg.ViewBox()
vb.setAspectLocked()
v.setCentralItem(vb)
l.addWidget(v, 0, 0, 3, 1)
w = pg.HistogramLUTWidget(background='w')
l.addWidget(w, 0, 1)
data = pg.gaussianFilter(np.random.normal(size=(256, 256, 3)), (20, 20, 0))
for i, j in itertools.product(range(32), range(32)):
data[i*8, j*8] += .1
img = pg.ImageItem(data)
vb.addItem(img)
vb.autoRange()
w.setImageItem(img)
QtWidgets.QApplication.processEvents()
win.close()
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