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# -*- coding: utf-8 -*-
# -----------------------------------------------------------------------------
# Copyright (c) Vispy Development Team. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
# -----------------------------------------------------------------------------
import sys
import numpy as np
import pytest
from vispy import scene, io
from vispy.testing import (requires_application, TestingCanvas,
run_tests_if_main)
from vispy.testing.image_tester import assert_image_approved
@pytest.mark.xfail('darwin' in sys.platform, reason="Differences in OSX rendering")
@requires_application()
def test_perspective_render():
with TestingCanvas(size=(120, 200)) as canvas:
grid = canvas.central_widget.add_grid()
imdata = io.load_crate().astype('float32') / 255
views = []
images = []
for i, imethod in enumerate(['impostor', 'subdivide']):
v = grid.add_view(row=i, col=0, border_color='white')
v.camera = 'turntable'
v.camera.fov = 50
v.camera.distance = 30
views.append(v)
image = scene.visuals.Image(imdata, method=imethod,
grid=(4, 4))
image.transform = scene.STTransform(translate=(-12.8, -12.8),
scale=(0.1, 0.1))
v.add(image)
images.append(image)
image = canvas.render()
canvas.close()
# Allow many pixels to differ by a small amount--texture sampling and
# exact triangle position will differ across platforms. However a
# change in perspective or in the widget borders should trigger a
# failure.
assert_image_approved(image, 'scene/cameras/perspective_test.png',
'perspective test 1: 2 identical views with '
'correct perspective',
px_threshold=20,
px_count=60,
max_px_diff=200)
@requires_application()
def test_panzoom_center():
with TestingCanvas(size=(120, 200)) as canvas:
grid = canvas.central_widget.add_grid()
imdata = io.load_crate().astype('float32') / 255
v = grid.add_view(row=0, col=0)
v.camera = 'panzoom'
image = scene.visuals.Image(imdata)
image.transform = scene.STTransform(translate=(-12.8, -12.8),
scale=(0.1, 0.1))
v.add(image)
result1 = canvas.render()[..., :3]
assert v.camera.center == (0.5, 0.5, 0)
v.camera.center = (-12.8, -12.8, 0)
result2 = canvas.render()[..., :3]
assert not np.allclose(result1, result2)
# we moved to the lower-left corner of the image that means only the
# upper-right quadrant should have data, the rest is black background
np.testing.assert_allclose(result2[100:, :], 0)
np.testing.assert_allclose(result2[:, :60], 0)
assert not np.allclose(result2[:100, 60:], 0)
assert v.camera.center == (-12.8, -12.8, 0)
@requires_application()
def test_panzoom_gesture_zoom():
with TestingCanvas(size=(120, 200)) as canvas:
view = canvas.central_widget.add_view()
imdata = io.load_crate().astype('float32') / 255
scene.visuals.Image(imdata, parent=view.scene)
view.camera = scene.PanZoomCamera(aspect=1)
assert view.camera.rect.size == (1, 1)
canvas.events.touch(
type="gesture_zoom",
pos=(60, 100),
scale=-1.0,
)
assert view.camera.rect.size == (2, 2)
@requires_application()
def test_turntable_gesture_zoom():
with TestingCanvas(size=(120, 200)) as canvas:
view = canvas.central_widget.add_view()
imdata = io.load_crate().astype('float32') / 255
scene.visuals.Image(imdata, parent=view.scene)
view.camera = scene.TurntableCamera()
initial_scale_factor = view.camera.scale_factor
canvas.events.touch(
type="gesture_zoom",
pos=(60, 100),
scale=-1.0,
)
assert view.camera.scale_factor == 2 * initial_scale_factor
run_tests_if_main()
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