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# -*- coding: utf-8 -*-
import numpy as np
from vispy.visuals.transforms import STTransform
from vispy.scene.visuals import Histogram
from vispy.testing import (requires_application, TestingCanvas,
run_tests_if_main)
from vispy.testing.image_tester import assert_image_approved
@requires_application()
def test_histogram():
"""Test histogram visual"""
size = (200, 100)
with TestingCanvas(size=size, bgcolor='w') as c:
np.random.seed(2397)
data = np.random.normal(size=100)
hist = Histogram(data, bins=20, color='k', parent=c.scene)
hist.transform = STTransform((size[0] // 10, -size[1] // 20, 1),
(100, size[1]))
assert_image_approved(c.render(), "visuals/histogram.png")
run_tests_if_main()
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