/usr/lib/python2.7/dist-packages/dipy/viz/tests/test_fvtk_window.py is in python-dipy 0.10.1-1.
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import numpy as np
from dipy.viz import actor, window
import numpy.testing as npt
from dipy.testing.decorators import xvfb_it
use_xvfb = os.environ.get('TEST_WITH_XVFB', False)
if use_xvfb == 'skip':
skip_it = True
else:
skip_it = False
@npt.dec.skipif(not actor.have_vtk or not actor.have_vtk_colors or skip_it)
@xvfb_it
def test_renderer():
ren = window.Renderer()
# background color for renderer (1, 0.5, 0)
# 0.001 added here to remove numerical errors when moving from float
# to int values
bg_float = (1, 0.501, 0)
# that will come in the image in the 0-255 uint scale
bg_color = tuple((np.round(255 * np.array(bg_float))).astype('uint8'))
ren.background(bg_float)
# window.show(ren)
arr = window.snapshot(ren)
report = window.analyze_snapshot(arr,
bg_color=bg_color,
colors=[bg_color, (0, 127, 0)])
npt.assert_equal(report.objects, 0)
npt.assert_equal(report.colors_found, [True, False])
axes = actor.axes()
ren.add(axes)
# window.show(ren)
arr = window.snapshot(ren)
report = window.analyze_snapshot(arr, bg_color)
npt.assert_equal(report.objects, 1)
ren.rm(axes)
arr = window.snapshot(ren)
report = window.analyze_snapshot(arr, bg_color)
npt.assert_equal(report.objects, 0)
window.add(ren, axes)
arr = window.snapshot(ren)
report = window.analyze_snapshot(arr, bg_color)
npt.assert_equal(report.objects, 1)
ren.rm_all()
arr = window.snapshot(ren)
report = window.analyze_snapshot(arr, bg_color)
npt.assert_equal(report.objects, 0)
ren2 = window.renderer(bg_float)
ren2.background((0, 0, 0.))
report = window.analyze_renderer(ren2)
npt.assert_equal(report.bg_color, (0, 0, 0))
ren2.add(axes)
report = window.analyze_renderer(ren2)
npt.assert_equal(report.actors, 3)
window.rm(ren2, axes)
report = window.analyze_renderer(ren2)
npt.assert_equal(report.actors, 0)
@npt.dec.skipif(not actor.have_vtk or not actor.have_vtk_colors or skip_it)
@xvfb_it
def test_active_camera():
renderer = window.Renderer()
renderer.add(actor.axes(scale=(1, 1, 1)))
renderer.reset_camera()
renderer.reset_clipping_range()
direction = renderer.camera_direction()
position, focal_point, view_up = renderer.get_camera()
renderer.set_camera((0., 0., 1.), (0., 0., 0), view_up)
position, focal_point, view_up = renderer.get_camera()
npt.assert_almost_equal(np.dot(direction, position), -1)
renderer.zoom(1.5)
new_position, _, _ = renderer.get_camera()
npt.assert_array_almost_equal(position, new_position)
renderer.zoom(1)
# rotate around focal point
renderer.azimuth(90)
position, _, _ = renderer.get_camera()
npt.assert_almost_equal(position, (1.0, 0.0, 0))
arr = window.snapshot(renderer)
report = window.analyze_snapshot(arr, colors=[(255, 0, 0)])
npt.assert_equal(report.colors_found, [True])
# rotate around camera's center
renderer.yaw(90)
arr = window.snapshot(renderer)
report = window.analyze_snapshot(arr, colors=[(0, 0, 0)])
npt.assert_equal(report.colors_found, [True])
renderer.yaw(-90)
renderer.elevation(90)
arr = window.snapshot(renderer)
report = window.analyze_snapshot(arr, colors=(0, 255, 0))
npt.assert_equal(report.colors_found, [True])
renderer.set_camera((0., 0., 1.), (0., 0., 0), view_up)
# vertical rotation of the camera around the focal point
renderer.pitch(10)
renderer.pitch(-10)
# rotate around the direction of projection
renderer.roll(90)
# inverted normalized distance from focal point along the direction
# of the camera
position, _, _ = renderer.get_camera()
renderer.dolly(0.5)
new_position, _, _ = renderer.get_camera()
npt.assert_almost_equal(position[2], 0.5 * new_position[2])
@npt.dec.skipif(not actor.have_vtk or not actor.have_vtk_colors or skip_it)
@xvfb_it
def test_parallel_projection():
ren = window.Renderer()
axes = actor.axes()
ren.add(axes)
axes2 = actor.axes()
axes2.SetPosition((2, 0, 0))
ren.add(axes2)
# Put the camera on a angle so that the
# camera can show the difference between perspective
# and parallel projection
ren.set_camera((1.5, 1.5, 1.5))
ren.GetActiveCamera().Zoom(2)
# window.show(ren, reset_camera=True)
ren.reset_camera()
arr = window.snapshot(ren)
ren.projection('parallel')
# window.show(ren, reset_camera=False)
arr2 = window.snapshot(ren)
# Because of the parallel projection the two axes
# will have the same size and therefore occupy more
# pixels rather than in perspective projection were
# the axes being further will be smaller.
npt.assert_equal(np.sum(arr2 > 0) > np.sum(arr > 0), True)
@npt.dec.skipif(not actor.have_vtk or not actor.have_vtk_colors or skip_it)
@xvfb_it
def test_order_transparent():
renderer = window.Renderer()
lines = [np.array([[-1, 0, 0.], [1, 0, 0.]]),
np.array([[-1, 1, 0.], [1, 1, 0.]])]
colors = np.array([[1., 0., 0.], [0., .5, 0.]])
stream_actor = actor.streamtube(lines, colors, linewidth=0.3, opacity=0.5)
renderer.add(stream_actor)
renderer.reset_camera()
# green in front
renderer.elevation(90)
renderer.camera().OrthogonalizeViewUp()
renderer.reset_clipping_range()
renderer.reset_camera()
not_xvfb = os.environ.get("TEST_WITH_XVFB", False)
if not_xvfb:
arr = window.snapshot(renderer, fname='green_front.png',
offscreen=True, order_transparent=False)
else:
arr = window.snapshot(renderer, fname='green_front.png',
offscreen=False, order_transparent=False)
# therefore the green component must have a higher value (in RGB terms)
npt.assert_equal(arr[150, 150][1] > arr[150, 150][0], True)
# red in front
renderer.elevation(-180)
renderer.camera().OrthogonalizeViewUp()
renderer.reset_clipping_range()
if not_xvfb:
arr = window.snapshot(renderer, fname='red_front.png',
offscreen=True, order_transparent=True)
else:
arr = window.snapshot(renderer, fname='red_front.png',
offscreen=False, order_transparent=True)
# therefore the red component must have a higher value (in RGB terms)
npt.assert_equal(arr[150, 150][0] > arr[150, 150][1], True)
if __name__ == '__main__':
npt.run_module_suite()
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