fix: Add measure tool dark mode

Author: AlejandroFernandezLuces

examples/00-basic-pyvista-examples/plain_usage.py

@@ -48,6 +48,7 @@
 pl.plot(mesh)
 
 # Show the plotter
+pl.backend._pl.scene.set_background("black")
 pl.show()
 
 

src/ansys/tools/visualization_interface/backends/pyvista/widgets/measure.py

@@ -82,7 +82,10 @@ def callback(self, state: bool) -> None:
                 self.plotter_helper.disable_picking()
             elif self.plotter_helper._allow_hovering:
                 self.plotter_helper.disable_hover()
-            self._widget = self.plotter_helper._pl.scene.add_measurement_widget()
+            if self._dark_mode:
+                self._widget = self.plotter_helper._pl.scene.add_measurement_widget(color="white")
+            else:
+                self._widget = self.plotter_helper._pl.scene.add_measurement_widget()
 
     def update(self) -> None:
         """Define the measurement widget button parameters."""