def test_GIVEN_animation_parameters_WHEN_calling_set_neutron_animation_properties_THEN_properties_set(
):
mock_neutron_animation_controller = Mock()
animation_distance = 15
time_span_offset = 5
mock_neutron_animation = Mock()
Gnomon.set_neutron_animation_properties(
mock_neutron_animation,
mock_neutron_animation_controller,
animation_distance,
time_span_offset,
)
mock_neutron_animation.setTargetObject.assert_called_once_with(
mock_neutron_animation_controller)
mock_neutron_animation.setPropertyName.assert_called_once_with(b"distance")
mock_neutron_animation.setStartValue.assert_called_once_with(0)
mock_neutron_animation.setEndValue.assert_called_once_with(
animation_distance)
mock_neutron_animation.setDuration.assert_called_once_with(
500 + time_span_offset)
mock_neutron_animation.setLoopCount.assert_called_once_with(-1)
mock_neutron_animation.start.assert_called_once()
def test_GIVEN_radius_WHEN_calling_set_sphere_mesh_radius_THEN_radius_set():
radius = 2
mock_sphere_mesh = Mock()
Gnomon.set_sphere_mesh_radius(mock_sphere_mesh, radius)
mock_sphere_mesh.setRadius.assert_called_once_with(radius)
def test_GIVEN_cylinder_and_length_WHEN_calling_configure_gnomon_cylinder_THEN_properties_set(
):
mock_cylinder_mesh = Mock()
length = 20
Gnomon.configure_gnomon_cylinder(mock_cylinder_mesh, length)
mock_cylinder_mesh.setRadius.assert_called_once_with(length * 0.05)
mock_cylinder_mesh.setLength.assert_called_once_with(length)
mock_cylinder_mesh.setRings.assert_called_once_with(2)
def test_GIVEN_mesh_and_length_WHEN_calling_configure_gnomon_cone_THEN_properties_set(
):
cone_mesh = Mock()
gnomon_cylinder_length = 10
Gnomon.configure_gnomon_cone(cone_mesh, gnomon_cylinder_length)
cone_mesh.setLength.assert_called_once_with(gnomon_cylinder_length * 0.3)
cone_mesh.setBottomRadius.assert_called_once_with(gnomon_cylinder_length *
0.1)
cone_mesh.setTopRadius.assert_called_once_with(0)
def test_GIVEN_cylinder_dimensions_WHEN_calling_set_cylinder_mesh_dimensions_THEN_dimensions_set(
):
radius = 2
length = 10
rings = 2
mock_cylinder = Mock()
Gnomon.set_cylinder_mesh_dimensions(mock_cylinder, radius, length, rings)
mock_cylinder.setRadius.assert_called_once_with(radius)
mock_cylinder.setLength.assert_called_once_with(length)
mock_cylinder.setRings.assert_called_once_with(rings)
def test_GIVEN_entity_label_and_color_WHEN_calling_set_axis_label_text_THEN_properties_set(
):
text_entity = Mock()
text_label = "X"
text_color = "green"
Gnomon.set_axis_label_text(text_entity, text_label, text_color)
text_entity.setText.assert_called_once_with(text_label)
text_entity.setHeight.assert_called_once_with(1.2)
text_entity.setWidth.assert_called_once_with(1)
text_entity.setColor.assert_called_once_with(QColor(text_color))
text_entity.setFont.assert_called_once_with(QFont("Courier New", 1))
def test_GIVEN_cylinder_transform_WHEN_calling_set_beam_transform_THEN_matrix_set(
):
neutron_animation_length = 15
expected_matrix = QMatrix4x4()
expected_matrix.rotate(90, QVector3D(1, 0, 0))
expected_matrix.translate(QVector3D(0, neutron_animation_length * 0.5, 0))
mock_cylinder_transform = Mock()
mock_cylinder_transform.setMatrix = Mock()
Gnomon.set_beam_transform(mock_cylinder_transform,
neutron_animation_length)
assert mock_cylinder_transform.setMatrix.call_args[0][0] == expected_matrix
def test_GIVEN_view_matrix_and_vector_WHEN_calling_create_billboard_transformation_THEN_corect_matrix_returned(
):
view_matrix = QMatrix4x4(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16)
text_vector = QVector3D(10, 10, 10)
expected_matrix = view_matrix.transposed()
expected_matrix.setRow(3, QVector4D())
expected_matrix.setColumn(3, QVector4D(text_vector, 1))
actual_matrix = Gnomon.create_billboard_transformation(
view_matrix, text_vector)
assert expected_matrix == actual_matrix
def test_GIVEN_vectors_WHEN_calling_create_axis_label_matrices_THEN_correct_matrices_returned(
):
vectors = [QVector3D(1, 0, 0), QVector3D(0, 1, 0), QVector3D(0, 0, 1)]
expected_x = QMatrix4x4()
expected_y = QMatrix4x4()
expected_z = QMatrix4x4()
expected_x.translate(vectors[0])
expected_y.translate(vectors[1])
expected_z.translate(vectors[2])
actual_x, actual_y, actual_z = Gnomon.create_axis_label_matrices(vectors)
assert expected_x == actual_x
assert expected_y == actual_y
assert expected_z == actual_z
def test_GIVEN_cone_length_WHEN_calling_create_cone_matrices_THEN_correct_matrices_returned(
):
length = 8
expected_x = QMatrix4x4()
expected_y = QMatrix4x4()
expected_z = QMatrix4x4()
expected_x.rotate(270, QVector3D(0, 0, 1))
expected_x.translate(QVector3D(0, length, 0))
expected_y.translate(QVector3D(0, length, 0))
expected_z.rotate(90, QVector3D(1, 0, 0))
expected_z.translate(QVector3D(0, length, 0))
actual_x, actual_y, actual_z = Gnomon.create_cone_matrices(length)
assert expected_x == actual_x
assert expected_y == actual_y
assert expected_z == actual_z
def __init__(self, parent):
super().__init__()
self.root_entity = Qt3DCore.QEntity()
# Make additional entities for the gnomon and instrument components
self.combined_component_axes_entity = Qt3DCore.QEntity(self.root_entity)
self.component_root_entity = Qt3DCore.QEntity(
self.combined_component_axes_entity
)
self.axes_root_entity = Qt3DCore.QEntity(self.combined_component_axes_entity)
self.gnomon_root_entity = Qt3DCore.QEntity(self.root_entity)
# Create the 3DWindow and place it in a widget with a layout
lay = QVBoxLayout(self)
self.view = InstrumentZooming3DWindow(self.component_root_entity)
self.view.defaultFrameGraph().setClearColor(QColor("lightgrey"))
self.view.setRootEntity(self.root_entity)
container = QWidget.createWindowContainer(self.view)
lay.addWidget(container)
# Set the properties of the instrument camera controller
camera_entity = self.view.camera()
cam_controller = Qt3DExtras.QFirstPersonCameraController(self.root_entity)
cam_controller.setLinearSpeed(20)
cam_controller.setCamera(camera_entity)
# Enable the camera to see a large distance by giving it a small nearView and large farView
self.view.camera().lens().setPerspectiveProjection(45, 16 / 9, 0.01, 1000)
# Set the camera view centre as the origin and position the camera so that it looks down at the initial sample
self.view.camera().setPosition(QVector3D(6, 8, 30))
self.view.camera().setViewCenter(QVector3D(0, 0, 0))
# Make sure that the size of the gnomon stays the same when the 3D view is resized
self.view.heightChanged.connect(self.update_gnomon_size)
self.view.widthChanged.connect(self.update_gnomon_size)
# Keep a reference to the gnomon viewport so that it can be resized to preserve the original size of the gnomon
self.gnomon_viewport = None
# Choose a fixed height and width for the gnomon so that this can be preserved when the 3D view is resized
self.gnomon_height = self.gnomon_width = 140
# Create the gnomon resources
self.gnomon = Gnomon(self.gnomon_root_entity, self.view.camera())
# Create the axes lines objects
InstrumentViewAxes(self.axes_root_entity, self.view.camera().farPlane())
# Dictionary of components and transformations so that we can delete them later
self.component_entities = {}
self.transformations = {}
# Create layers in order to allow one camera to only see the gnomon and one camera to only see the
# components and axis lines
self.create_layers()
self.initialise_view()
# Insert the beam cylinder last. This ensures that the semi-transparency works correctly.
self.gnomon.setup_beam_cylinder()
# Move the gnomon when the camera view changes
self.view.camera().viewVectorChanged.connect(self.gnomon.update_gnomon)
class InstrumentView(QWidget):
"""
Class for managing the 3D view in the NeXus Constructor. Creates the initial sample, the initial beam, and the
neutron animation.
:param parent: The MainWindow in which this widget is created. This isn't used for anything but is accepted as an
argument in order to appease Qt Designer.
"""
def delete(self):
"""
Fixes Qt3D segfault - this needs to be called when the program closes otherwise Qt tries to draw objects as python is cleaning them up.
"""
self.clear_all_components()
del self.root_entity
del self.view
def __init__(self, parent):
super().__init__()
self.root_entity = Qt3DCore.QEntity()
# Make additional entities for the gnomon and instrument components
self.combined_component_axes_entity = Qt3DCore.QEntity(self.root_entity)
self.component_root_entity = Qt3DCore.QEntity(
self.combined_component_axes_entity
)
self.axes_root_entity = Qt3DCore.QEntity(self.combined_component_axes_entity)
self.gnomon_root_entity = Qt3DCore.QEntity(self.root_entity)
# Create the 3DWindow and place it in a widget with a layout
lay = QVBoxLayout(self)
self.view = InstrumentZooming3DWindow(self.component_root_entity)
self.view.defaultFrameGraph().setClearColor(QColor("lightgrey"))
self.view.setRootEntity(self.root_entity)
container = QWidget.createWindowContainer(self.view)
lay.addWidget(container)
# Set the properties of the instrument camera controller
camera_entity = self.view.camera()
cam_controller = Qt3DExtras.QFirstPersonCameraController(self.root_entity)
cam_controller.setLinearSpeed(20)
cam_controller.setCamera(camera_entity)
# Enable the camera to see a large distance by giving it a small nearView and large farView
self.view.camera().lens().setPerspectiveProjection(45, 16 / 9, 0.01, 1000)
# Set the camera view centre as the origin and position the camera so that it looks down at the initial sample
self.view.camera().setPosition(QVector3D(6, 8, 30))
self.view.camera().setViewCenter(QVector3D(0, 0, 0))
# Make sure that the size of the gnomon stays the same when the 3D view is resized
self.view.heightChanged.connect(self.update_gnomon_size)
self.view.widthChanged.connect(self.update_gnomon_size)
# Keep a reference to the gnomon viewport so that it can be resized to preserve the original size of the gnomon
self.gnomon_viewport = None
# Choose a fixed height and width for the gnomon so that this can be preserved when the 3D view is resized
self.gnomon_height = self.gnomon_width = 140
# Create the gnomon resources
self.gnomon = Gnomon(self.gnomon_root_entity, self.view.camera())
# Create the axes lines objects
InstrumentViewAxes(self.axes_root_entity, self.view.camera().farPlane())
# Dictionary of components and transformations so that we can delete them later
self.component_entities = {}
self.transformations = {}
# Create layers in order to allow one camera to only see the gnomon and one camera to only see the
# components and axis lines
self.create_layers()
self.initialise_view()
# Insert the beam cylinder last. This ensures that the semi-transparency works correctly.
self.gnomon.setup_beam_cylinder()
# Move the gnomon when the camera view changes
self.view.camera().viewVectorChanged.connect(self.gnomon.update_gnomon)
def create_layers(self):
"""
Assigns the gnomon view and component view to different cameras and viewports. Controls the buffer behaviour of
the different viewports so that the depth buffer behaves in such a way that the gnomon is always in front.
"""
# Set up view surface selector for filtering
surface_selector = Qt3DRender.QRenderSurfaceSelector(self.root_entity)
surface_selector.setSurface(self.view)
main_camera = self.view.camera()
viewport = Qt3DRender.QViewport(surface_selector)
self.view.setActiveFrameGraph(surface_selector)
# Filters out just the instrument for the main camera to see
component_clear_buffers = self.create_camera_filter(
viewport, self.combined_component_axes_entity, main_camera
)
# Have the component buffer take on the default behaviour
component_clear_buffers.setBuffers(Qt3DRender.QClearBuffers.AllBuffers)
# Set the background color of the main scene
component_clear_buffers.setClearColor(QColor("lightgrey"))
# Create a viewport for gnomon in small section of the screen
self.gnomon_viewport = Qt3DRender.QViewport(surface_selector)
self.update_gnomon_size()
# Filter out the gnomon for just the gnomon camera to see
gnomon_camera = self.gnomon.get_gnomon_camera()
gnomon_clear_buffers = self.create_camera_filter(
self.gnomon_viewport, self.gnomon_root_entity, gnomon_camera
)
# Make the gnomon appear in front of everything else
gnomon_clear_buffers.setBuffers(Qt3DRender.QClearBuffers.DepthBuffer)
self.gnomon.update_gnomon()
def update_gnomon_size(self):
"""
Ensures that the gnomon retains its size when the size of the 3D view has been changed. Calculates the desired
gnomon size as a proportion of the current window size and passes these values to the gnomon viewport.
"""
height_ratio, width_ratio = self.calculate_gnomon_rect(
self.view.height(), self.view.width(), self.gnomon_height, self.gnomon_width
)
self.gnomon_viewport.setNormalizedRect(
QRectF(1 - width_ratio, 1 - height_ratio, width_ratio, height_ratio)
)
@staticmethod
def calculate_gnomon_rect(
view_height: float, view_width: float, gnomon_height: float, gnomon_width: float
) -> Tuple[float, float]:
"""
Finds the ratio of the desired gnomon height/width to the current 3D view height/width.
:param view_height: The current 3D view height.
:param view_width: The current 3D view width.
:param gnomon_height: The desired gnomon height.
:param gnomon_width: The desired gnomon width.
:return: The gnomon height/width ratios that are required to determine the size of the gnomon viewport.
"""
height_ratio = gnomon_height / view_height
width_ratio = gnomon_width / view_width
return height_ratio, width_ratio
@staticmethod
def create_camera_filter(
viewport: Qt3DRender.QViewport,
visible_entity: Qt3DCore.QEntity,
camera_to_filter: Qt3DRender.QCamera,
) -> Qt3DRender.QClearBuffers:
"""
Filter the objects that are visible to a camera.
:param viewport: The viewport that the camera is using.
:param visible_entity: Only children of this entity will be visible to the camera.
:param camera_to_filter: The camera to apply the filter to.
:return: The clear buffers
"""
layer_filter = Qt3DRender.QLayerFilter(viewport)
layer = Qt3DRender.QLayer(visible_entity)
visible_entity.addComponent(layer)
layer.setRecursive(True)
layer_filter.addLayer(layer)
camera_selector = Qt3DRender.QCameraSelector(layer_filter)
camera_selector.setCamera(camera_to_filter)
clear_buffers = Qt3DRender.QClearBuffers(camera_selector)
return clear_buffers
def add_component(
self, name: str, geometry: OFFGeometry, positions: List[QVector3D] = None
):
"""
Add a component to the instrument view given a name and its geometry.
:param name: The name of the component.
:param geometry: The geometry information of the component that is used to create a mesh.
:param positions: Mesh is repeated at each of these positions
"""
if geometry is None:
return
mesh = OffMesh(geometry.off_geometry, self.component_root_entity, positions)
material = create_material(
QColor("black"), QColor("grey"), self.component_root_entity
)
self.component_entities[name] = create_qentity(
[mesh, material], self.component_root_entity
)
def get_entity(self, component_name: str) -> Qt3DCore.QEntity:
"""
Obtain the entity from the InstrumentView based on its name.
"""
try:
return self.component_entities[component_name]
except KeyError:
logging.error(
f"Unable to retrieve component {component_name} because it doesn't exist."
)
@staticmethod
def zoom_to_component(entity: Qt3DCore.QEntity, camera: Qt3DRender.QCamera):
"""
Instructs a camera to zoom in on an individual component.
:param entity: The component entity that the camera should zoom in on.
:param camera: The camera that will do the zooming.
"""
camera.viewEntity(entity)
def clear_all_components(self):
"""
resets the entities in qt3d so all components are cleared from the 3d view.
"""
for component in self.component_entities.keys():
self.component_entities[component].setParent(None)
self.component_entities = dict()
def delete_component(self, name: str):
"""
Delete a component from the InstrumentView by removing the components and entity from the dictionaries.
:param name: The name of the component.
"""
try:
self.component_entities[name].setParent(None)
self.component_entities.pop(name)
except KeyError:
logging.error(
f"Unable to delete component {name} because it doesn't exist."
)
def add_transformation(
self, component_name: str, transformation: Qt3DCore.QTransform
):
"""
Add a transformation to a component, each component has a single transformation which contains
the resultant transformation for its entire depends_on chain of translations and rotations
"""
self.transformations[component_name] = transformation
component = self.component_entities[component_name]
component.addComponent(transformation)
def clear_all_transformations(self):
"""
Remove all transformations from all components
"""
for component_name, transformation in self.transformations.items():
self.component_entities[component_name].removeComponent(transformation)
self.transformations = {}
@staticmethod
def set_cube_mesh_dimensions(
cube_mesh: Qt3DExtras.QCuboidMesh, x: float, y: float, z: float
):
"""
Sets the dimensions of a cube mesh.
:param cube_mesh: The cube mesh to modify.
:param x: The desired x extent.
:param y: The desired y extent.
:param z: The desired z extent.
"""
cube_mesh.setXExtent(x)
cube_mesh.setYExtent(y)
cube_mesh.setZExtent(z)
def setup_sample_cube(self):
"""
Sets up the cube that represents a sample in the 3D view by giving the cube entity a mesh and a material.
"""
cube_mesh = Qt3DExtras.QCuboidMesh(self.component_root_entity)
self.set_cube_mesh_dimensions(cube_mesh, *[0.1, 0.1, 0.1])
dark_red = QColor("#b00")
sample_material = create_material(
QColor("red"), dark_red, self.component_root_entity, alpha=0.5
)
self.component_entities["sample"] = create_qentity(
[cube_mesh, sample_material], self.component_root_entity
)
def initialise_view(self):
"""
Calls the methods for defining materials, setting up the sample cube, and setting up the neutrons. Beam-related
functions are called outside of this method to ensure that those things are generated last.
"""
self.setup_sample_cube()
self.gnomon.create_gnomon()
self.gnomon.setup_neutrons()
