Add simple widget for rotating particles (#181)

Not much, but helps in a pinch.

src/blik/napari.yaml

@@ -49,6 +49,9 @@ contributions:
     - id: blik.filament_picking
       python_name: blik.widgets.picking:FilamentWidget
       title: "Open blik filament picking widget"
+    - id: blik.rotate_particles
+      python_name: blik.widgets.picking:rotate_particles
+      title: "Open blik rotate particles widget"
     - id: blik.file_reader_widget
       python_name: blik.widgets.file_reader:file_reader
       title: "Open blik file reader widget"
@@ -72,6 +75,7 @@ contributions:
       - command: blik.surface_picking
       - command: blik.sphere_picking
       - command: blik.filament_picking
+      - command: blik.rotate_particles
     napari/layers/filter:
       - command: blik.bandpass_filter
       - command: blik.gaussian_filter
@@ -136,6 +140,8 @@ contributions:
       display_name: "Sphere picking"
     - command: blik.filament_picking
       display_name: "Filament picking"
+    - command: blik.rotate_particles
+      display_name: "Rotate selected particles"
     - command: blik.file_reader_widget
       display_name: "File reader"
     - command: blik.bandpass_filter

src/blik/widgets/picking.py

@@ -2,7 +2,7 @@
 import numpy as np
 import pandas as pd
 from dask.array import compute
-from magicgui import magicgui
+from magicgui import magic_factory, magicgui
 from magicgui.widgets import Container
 from morphosamplers.helical_filament import HelicalFilament
 from morphosamplers.models import Sphere
@@ -515,3 +515,23 @@ def __init__(self, *args, **kwargs):
 
         self.append(sphere)
         self.append(sphere_particles)
+
+
+@magic_factory(
+    auto_call=True,
+    rot={"widget_type": "Slider", "min": 0, "max": 360},
+    tilt={"widget_type": "Slider", "min": 0, "max": 360},
+    psi={"widget_type": "Slider", "min": 0, "max": 360},
+)
+def rotate_particles(
+    particles: napari.layers.Points,
+    rot: int = 0,
+    tilt: int = 0,
+    psi: int = 0,
+) -> None:
+    """Quick and dirty rotation setter based on RELION convention."""
+    if particles.metadata.get("experiment_id", None) is None:
+        raise ValueError("The selected layer is not a blik Particles layer.")
+    ori = Rotation.from_euler("ZYZ", (rot, tilt, psi), degrees=True)
+    particles.features.loc[list(particles.selected_data), "orientation"] = ori
+    particles.events.features()