Repository: zauberzeug/nicegui
Pull request #3468 (2024-08-09 15:30:39)

Add function to update a point cloud
This PR adds a function to `PointCloud` which allows to update the point positions and colors. 


Patch:
diff --git a/nicegui/elements/scene.js b/nicegui/elements/scene.js
index 26ddc010..38de4898 100644
--- a/nicegui/elements/scene.js
+++ b/nicegui/elements/scene.js
@@ -149,7 +149,6 @@ export default {
     };
     const handleDrag = (event) => {
       this.drag_constraints.split(",").forEach((constraint) => applyConstraint(constraint, event.object.position));
-      if (event.type === "drag") return;
       this.$emit(event.type, {
         type: event.type,
         object_id: event.object.object_id,
@@ -158,7 +157,8 @@ export default {
         y: event.object.position.y,
         z: event.object.position.z,
       });
-      this.controls.enabled = event.type == "dragend";
+      if (event.type === "dragstart") this.controls.enabled = false;
+      if (event.type === "dragend") this.controls.enabled = true;
     };
     this.drag_controls.addEventListener("dragstart", handleDrag);
     this.drag_controls.addEventListener("drag", handleDrag);
@@ -195,8 +195,7 @@ export default {
         shift_key: mouseEvent.shiftKey,
       });
     };
-    this.$el.onclick = click_handler;
-    this.$el.ondblclick = click_handler;
+    this.click_events.forEach((event) => this.$el.addEventListener(event, click_handler));
 
     this.texture_loader = new THREE.TextureLoader();
     this.stl_loader = new STLLoader();
@@ -389,6 +388,11 @@ export default {
       if (!this.objects.has(object_id)) return;
       this.objects.get(object_id).geometry = texture_geometry(coords);
     },
+    set_points(object_id, position, color) {
+      const geometry = this.objects.get(object_id).geometry;
+      geometry.setAttribute("position", new THREE.Float32BufferAttribute(position.flat(), 3));
+      geometry.setAttribute("color", new THREE.Float32BufferAttribute(color.flat(), 3));
+    },
     move_camera(x, y, z, look_at_x, look_at_y, look_at_z, up_x, up_y, up_z, duration) {
       if (this.camera_tween) this.camera_tween.stop();
       this.camera_tween = new TWEEN.Tween([
@@ -425,6 +429,23 @@ export default {
         })
         .start();
     },
+    get_camera() {
+      return {
+        position: this.camera.position,
+        up: this.camera.up,
+        rotation: this.camera.rotation,
+        quaternion: this.camera.quaternion,
+        type: this.camera.type,
+        fov: this.camera.fov,
+        aspect: this.camera.aspect,
+        near: this.camera.near,
+        far: this.camera.far,
+        left: this.camera.left,
+        right: this.camera.right,
+        top: this.camera.top,
+        bottom: this.camera.bottom,
+      };
+    },
     resize() {
       const { clientWidth, clientHeight } = this.$el;
       this.renderer.setSize(clientWidth, clientHeight);
@@ -475,6 +496,7 @@ export default {
     grid: Object,
     camera_type: String,
     camera_params: Object,
+    click_events: Array,
     drag_constraints: String,
     background_color: String,
   },
diff --git a/nicegui/elements/scene.py b/nicegui/elements/scene.py
index 14f3e439..480a27e0 100644
--- a/nicegui/elements/scene.py
+++ b/nicegui/elements/scene.py
@@ -75,6 +75,7 @@ class Scene(Element,
                  grid: Union[bool, Tuple[int, int]] = True,
                  camera: Optional[SceneCamera] = None,
                  on_click: Optional[Callable[..., Any]] = None,
+                 click_events: List[str] = ['click', 'dblclick'],  # noqa: B006
                  on_drag_start: Optional[Callable[..., Any]] = None,
                  on_drag_end: Optional[Callable[..., Any]] = None,
                  drag_constraints: str = '',
@@ -91,7 +92,8 @@ class Scene(Element,
         :param height: height of the canvas
         :param grid: whether to display a grid (boolean or tuple of ``size`` and ``divisions`` for `Three.js' GridHelper <https://threejs.org/docs/#api/en/helpers/GridHelper>`_, default: 100x100)
         :param camera: camera definition, either instance of ``ui.scene.perspective_camera`` (default) or ``ui.scene.orthographic_camera``
-        :param on_click: callback to execute when a 3D object is clicked
+        :param on_click: callback to execute when a 3D object is clicked (use ``click_events`` to specify which events to subscribe to)
+        :param click_events: list of JavaScript click events to subscribe to (default: ``['click', 'dblclick']``)
         :param on_drag_start: callback to execute when a 3D object is dragged
         :param on_drag_end: callback to execute when a 3D object is dropped
         :param drag_constraints: comma-separated JavaScript expression for constraining positions of dragged objects (e.g. ``'x = 0, z = y / 2'``)
@@ -108,6 +110,7 @@ class Scene(Element,
         self.objects: Dict[str, Object3D] = {}
         self.stack: List[Union[Object3D, SceneObject]] = [SceneObject()]
         self._click_handlers = [on_click] if on_click else []
+        self._props['click_events'] = click_events
         self._drag_start_handlers = [on_drag_start] if on_drag_start else []
         self._drag_end_handlers = [on_drag_end] if on_drag_end else []
         self.is_initialized = False
@@ -263,6 +266,14 @@ class Scene(Element,
                         self.camera.look_at_x, self.camera.look_at_y, self.camera.look_at_z,
                         self.camera.up_x, self.camera.up_y, self.camera.up_z, duration)
 
+    async def get_camera(self) -> Dict[str, Any]:
+        """Get the current camera parameters.
+
+        In contrast to the `camera` property,
+        the result of this method includes the current camera pose caused by the user navigating the scene in the browser.
+        """
+        return await self.run_method('get_camera')
+
     def _handle_delete(self) -> None:
         binding.remove(list(self.objects.values()))
         super()._handle_delete()
diff --git a/nicegui/elements/scene_objects.py b/nicegui/elements/scene_objects.py
index 8b7822e7..01d393dd 100644
--- a/nicegui/elements/scene_objects.py
+++ b/nicegui/elements/scene_objects.py
@@ -329,3 +329,9 @@ class PointCloud(Object3D):
         :param point_size: size of the points (default: 1.0)
         """
         super().__init__('point_cloud', points, colors, point_size)
+
+    def set_points(self, points: List[List[float]], colors: List[List[float]]) -> None:
+        """Change the points and colors of the point cloud."""
+        self.args[0] = points
+        self.args[1] = colors
+        self.scene.run_method('set_points', self.id, points, colors)
diff --git a/nicegui/elements/tree.py b/nicegui/elements/tree.py
index 47bb67f7..01010bc3 100644
--- a/nicegui/elements/tree.py
+++ b/nicegui/elements/tree.py
@@ -41,7 +41,7 @@ class Tree(Element):
         self._props['node-key'] = node_key
         self._props['label-key'] = label_key
         self._props['children-key'] = children_key
-        self._props['selected'] = []
+        self._props['selected'] = None
         self._props['expanded'] = []
         self._props['ticked'] = []
         if tick_strategy is not None:
@@ -78,6 +78,20 @@ class Tree(Element):
         self._select_handlers.append(callback)
         return self
 
+    def select(self, node_key: Optional[str]) -> Self:
+        """Select the given node.
+
+        :param node_key: node key to select
+        """
+        if self._props['selected'] != node_key:
+            self._props['selected'] = node_key
+            self.update()
+        return self
+
+    def deselect(self) -> Self:
+        """Remove node selection."""
+        return self.select(None)
+
     def on_expand(self, callback: Callable[..., Any]) -> Self:
         """Add a callback to be invoked when the expansion changes."""
         self._expand_handlers.append(callback)
@@ -88,6 +102,24 @@ class Tree(Element):
         self._tick_handlers.append(callback)
         return self
 
+    def tick(self, node_keys: Optional[List[str]] = None) -> Self:
+        """Tick the given nodes.
+
+        :param node_keys: list of node keys to tick or ``None`` to tick all nodes (default: ``None``)
+        """
+        self._props['ticked'][:] = self._find_node_keys(node_keys).union(self._props['ticked'])
+        self.update()
+        return self
+
+    def untick(self, node_keys: Optional[List[str]] = None) -> Self:
+        """Remove tick from the given nodes.
+
+        :param node_keys: list of node keys to untick or ``None`` to untick all nodes (default: ``None``)
+        """
+        self._props['ticked'][:] = set(self._props['ticked']).difference(self._find_node_keys(node_keys))
+        self.update()
+        return self
+
     def expand(self, node_keys: Optional[List[str]] = None) -> Self:
         """Expand the given nodes.
 
diff --git a/poetry.lock b/poetry.lock
index 5480676d..7a2eccd6 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,4 +1,4 @@
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+# This file is automatically @generated by Poetry 1.8.3 and should not be changed by hand.
 
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 name = "aiofiles"
@@ -24,87 +24,87 @@ files = [
 
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-
-[package.dependencies]
-numpy = ">=1.16"
-
-[package.extras]
-bokeh = ["bokeh", "selenium"]
-docs = ["furo", "sphinx-copybutton"]
-mypy = ["contourpy[bokeh,docs]", "docutils-stubs", "mypy (==1.2.0)", "types-Pillow"]
-test = ["Pillow", "contourpy[test-no-images]", "matplotlib"]
-test-no-images = ["pytest", "pytest-cov", "wurlitzer"]
-
 [[package]]
 name = "contourpy"
 version = "1.1.1"
@@ -1671,8 +1609,8 @@ files = [
 [package.dependencies]
 numpy = [
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     {version = ">=1.23.2", markers = "python_version >= \"3.11\""},
+    {version = ">=1.21.0", markers = "python_version >= \"3.10\" and python_version < \"3.11\""},
 ]
 python-dateutil = ">=2.8.2"
 pytz = ">=2020.1"
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@@ -3429,4 +3356,4 @@ sass = ["libsass"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.8"
-content-hash = "948378958f48000c5d83251eccc42648b12bdd996221688acf41bf081dec3fb4"
+content-hash = "81a904dadf1ccf383a2994ea11b8f56a97ff97906be657b43681f6675bf1b1d4"
diff --git a/pyproject.toml b/pyproject.toml
index 79bb39bd..8b31d7f2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ matplotlib = { version = "^3.5.0", optional = true }
 httpx = ">=0.24.0"
 nicegui-highcharts = { version = "^1.0.1", optional = true }
 ifaddr = ">=0.2.0"
-aiohttp = ">=3.9.2" # https://github.com/zauberzeug/nicegui/security/dependabot/25 and 26
+aiohttp = ">=3.10.2" # https://github.com/zauberzeug/nicegui/security/dependabot/36
 libsass = { version = "^0.23.0", optional = true }
 docutils = "^0.19"
 requests = ">=2.32.0" # https://github.com/zauberzeug/nicegui/security/dependabot/33
diff --git a/website/documentation/content/scene_documentation.py b/website/documentation/content/scene_documentation.py
index 693f60aa..78b7289b 100644
--- a/website/documentation/content/scene_documentation.py
+++ b/website/documentation/content/scene_documentation.py
@@ -60,6 +60,35 @@ def click_events() -> None:
         scene.box().move(x=1, z=1).with_name('box')
 
 
+@doc.demo('Context menu for 3D objects', '''
+    This demo shows how to create a context menu for 3D objects.
+    By setting the `click_events` argument to `['contextmenu']`, the `handle_click` function will be called on right-click.
+    It clears the context menu and adds items based on the object that was clicked.
+''')
+def context_menu_for_3d_objects():
+    from nicegui import events
+
+    def handle_click(e: events.SceneClickEventArguments) -> None:
+        context_menu.clear()
+        name = next((hit.object_name for hit in e.hits if hit.object_name), None)
+        with context_menu:
+            if name == 'sphere':
+                ui.item('SPHERE').classes('font-bold')
+                ui.menu_item('inspect')
+                ui.menu_item('open')
+            if name == 'box':
+                ui.item('BOX').classes('font-bold')
+                ui.menu_item('rotate')
+                ui.menu_item('move')
+
+    with ui.element():
+        context_menu = ui.context_menu()
+        with ui.scene(width=285, height=220, on_click=handle_click,
+                      click_events=['contextmenu']) as scene:
+            scene.sphere().move(x=-1, z=1).with_name('sphere')
+            scene.box().move(x=1, z=1).with_name('box')
+
+
 @doc.demo('Draggable objects', '''
     You can make objects draggable using the `.draggable` method.
     There is an optional `on_drag_start` and `on_drag_end` argument to `ui.scene` to handle drag events.
@@ -88,18 +117,49 @@ def draggable_objects() -> None:
               on_change=lambda e: sphere.draggable(e.value))
 
 
+@doc.demo('Subscribe to the drag event', '''
+    By default, a draggable object is only updated when the drag ends to avoid performance issues.
+    But you can explicitly subscribe to the "drag" event to get immediate updates.
+    In this demo we update the position and size of a box based on the positions of two draggable spheres.
+''')
+def immediate_updates() -> None:
+    from nicegui import events
+
+    with ui.scene(drag_constraints='z=0') as scene:
+        box = scene.box(1, 1, 0.2).move(0, 0).material('Orange')
+        sphere1 = scene.sphere(0.2).move(0.5, -0.5).material('SteelBlue').draggable()
+        sphere2 = scene.sphere(0.2).move(-0.5, 0.5).material('SteelBlue').draggable()
+
+    def handle_drag(e: events.GenericEventArguments) -> None:
+        x1 = sphere1.x if e.args['object_id'] == sphere2.id else e.args['x']
+        y1 = sphere1.y if e.args['object_id'] == sphere2.id else e.args['y']
+        x2 = sphere2.x if e.args['object_id'] == sphere1.id else e.args['x']
+        y2 = sphere2.y if e.args['object_id'] == sphere1.id else e.args['y']
+        box.move((x1 + x2) / 2, (y1 + y2) / 2).scale(x2 - x1, y2 - y1, 1)
+    scene.on('drag', handle_drag)
+
+
 @doc.demo('Rendering point clouds', '''
     You can render point clouds using the `point_cloud` method.
     The `points` argument is a list of point coordinates, and the `colors` argument is a list of RGB colors (0..1).
+    You can update the cloud using its `set_points()` method.
 ''')
 def point_clouds() -> None:
     import numpy as np
 
-    with ui.scene().classes('w-full h-64') as scene:
+    def generate_data(frequency: float = 1.0):
         x, y = np.meshgrid(np.linspace(-3, 3), np.linspace(-3, 3))
-        z = np.sin(x) * np.cos(y) + 1
+        z = np.sin(x * frequency) * np.cos(y * frequency) + 1
         points = np.dstack([x, y, z]).reshape(-1, 3)
-        scene.point_cloud(points=points, colors=points, point_size=0.1)
+        colors = points / [6, 6, 2] + [0.5, 0.5, 0]
+        return points, colors
+
+    with ui.scene().classes('w-full h-64') as scene:
+        points, colors = generate_data()
+        point_cloud = scene.point_cloud(points, colors, point_size=0.1)
+
+    ui.slider(min=0.1, max=3, step=0.1, value=1) \
+        .on_value_change(lambda e: point_cloud.set_points(*generate_data(e.value)))
 
 
 @doc.demo('Wait for Initialization', '''
@@ -137,6 +197,24 @@ def orthographic_camera() -> None:
         scene.box()
 
 
+@doc.demo('Get current camera pose', '''
+    Using the `get_camera` method you can get a dictionary of current camera parameters like position, rotation, field of view and more.
+    This demo shows how to continuously move a sphere towards the camera.
+    Try moving the camera around to see the sphere following it.
+''')
+def camera_pose() -> None:
+    with ui.scene().classes('w-full h-64') as scene:
+        ball = scene.sphere()
+
+    async def move():
+        camera = await scene.get_camera()
+        if camera is not None:
+            ball.move(x=0.95 * ball.x + 0.05 * camera['position']['x'],
+                      y=0.95 * ball.y + 0.05 * camera['position']['y'],
+                      z=1.0)
+    ui.timer(0.1, move)
+
+
 @doc.demo('Custom Background', '''
     You can set a custom background color using the `background_color` parameter of `ui.scene`.
 ''')
diff --git a/website/documentation/content/tree_documentation.py b/website/documentation/content/tree_documentation.py
index 2f4d403a..c0ae0e4f 100644
--- a/website/documentation/content/tree_documentation.py
+++ b/website/documentation/content/tree_documentation.py
@@ -35,7 +35,17 @@ def tree_with_custom_header_and_body():
     ''')
 
 
-@doc.demo('Expand and collapse programmatically', '''
+@doc.demo('Tree with checkboxes', '''
+    The tree can be used with checkboxes by setting the "tick-strategy" prop.
+''')
+def tree_with_checkboxes():
+    ui.tree([
+        {'id': 'A', 'children': [{'id': 'A1'}, {'id': 'A2'}]},
+        {'id': 'B', 'children': [{'id': 'B1'}, {'id': 'B2'}]},
+    ], label_key='id', tick_strategy='leaf', on_tick=lambda e: ui.notify(e.value))
+
+
+@doc.demo('Expand/collapse programmatically', '''
     The whole tree or individual nodes can be toggled programmatically using the `expand()` and `collapse()` methods.
     This even works if a node is disabled (e.g. not clickable by the user).
 ''')
@@ -52,14 +62,36 @@ def expand_programmatically():
         ui.button('- A', on_click=lambda: t.collapse(['A']))
 
 
-@doc.demo('Tree with checkboxes', '''
-    The tree can be used with checkboxes by setting the "tick-strategy" prop.
+@doc.demo('Select/deselect programmatically', '''
+    You can select or deselect nodes with the `select()` and `deselect()` methods.
 ''')
-def tree_with_checkboxes():
-    ui.tree([
-        {'id': 'A', 'children': [{'id': 'A1'}, {'id': 'A2'}]},
-        {'id': 'B', 'children': [{'id': 'B1'}, {'id': 'B2'}]},
-    ], label_key='id', tick_strategy='leaf', on_tick=lambda e: ui.notify(e.value))
+def select_programmatically():
+    t = ui.tree([
+        {'id': 'numbers', 'children': [{'id': '1'}, {'id': '2'}]},
+        {'id': 'letters', 'children': [{'id': 'A'}, {'id': 'B'}]},
+    ], label_key='id').expand()
+
+    with ui.row():
+        ui.button('Select A', on_click=lambda: t.select('A'))
+        ui.button('Deselect A', on_click=t.deselect)
+
+
+@doc.demo('Tick/untick programmatically', '''
+    After setting a `tick_strategy`, you can tick or untick nodes with the `tick()` and `untick()` methods.
+    You can either specify a list of node keys or `None` to tick or untick all nodes.
+''')
+def tick_programmatically():
+    t = ui.tree([
+        {'id': 'numbers', 'children': [{'id': '1'}, {'id': '2'}]},
+        {'id': 'letters', 'children': [{'id': 'A'}, {'id': 'B'}]},
+    ], label_key='id', tick_strategy='leaf').expand()
+
+    with ui.row():
+        ui.button('Tick 1, 2 and B', on_click=lambda: t.tick(['1', '2', 'B']))
+        ui.button('Untick 2 and B', on_click=lambda: t.untick(['2', 'B']))
+    with ui.row():
+        ui.button('Tick all', on_click=t.tick)
+        ui.button('Untick all', on_click=t.untick)
 
 
 doc.reference(ui.tree)


Test patch:
diff --git a/tests/test_tree.py b/tests/test_tree.py
index c2ca2ef7..bebb56e2 100644
--- a/tests/test_tree.py
+++ b/tests/test_tree.py
@@ -62,3 +62,49 @@ def test_expand_and_collapse_nodes(screen: Screen):
     screen.should_not_contain('2')
     screen.should_contain('A')
     screen.should_contain('B')
+
+
+def test_select_deselect_node(screen: Screen):
+    tree = ui.tree([
+        {'id': 'numbers', 'children': [{'id': '1'}, {'id': '2'}]},
+        {'id': 'letters', 'children': [{'id': 'A'}, {'id': 'B'}]},
+    ], label_key='id')
+
+    ui.button('Select', on_click=lambda: tree.select('2'))
+    ui.button('Deselect', on_click=tree.deselect)
+    ui.label().bind_text_from(tree._props, 'selected', lambda x: f'Selected: {x}')
+
+    screen.open('/')
+    screen.click('Select')
+    screen.should_contain('Selected: 2')
+
+    screen.click('Deselect')
+    screen.should_contain('Selected: None')
+
+
+def test_tick_untick_node_or_nodes(screen: Screen):
+    tree = ui.tree([
+        {'id': 'numbers', 'children': [{'id': '1'}, {'id': '2'}]},
+        {'id': 'letters', 'children': [{'id': 'A'}, {'id': 'B'}]},
+    ], label_key='id', tick_strategy='leaf')
+
+    ui.button('Tick some', on_click=lambda: tree.tick(['1', '2', 'B']))
+    ui.button('Untick some', on_click=lambda: tree.untick(['1', 'B']))
+    ui.button('Tick all', on_click=tree.tick)
+    ui.button('Untick all', on_click=tree.untick)
+    ui.label().bind_text_from(tree._props, 'ticked', lambda x: f'Ticked: {sorted(x)}')
+
+    screen.open('/')
+    screen.should_contain('Ticked: []')
+
+    screen.click('Tick some')
+    screen.should_contain("Ticked: ['1', '2', 'B']")
+
+    screen.click('Untick some')
+    screen.should_contain("Ticked: ['2']")
+
+    screen.click('Tick all')
+    screen.should_contain("Ticked: ['1', '2', 'A', 'B', 'letters', 'numbers']")
+
+    screen.click('Untick all')
+    screen.should_contain('Ticked: []')