refactor: More changes to docs/layout

src/blender_maxwell/node_trees/maxwell_sim_nodes/contracts/flow_kinds.py

@@ -108,7 +108,25 @@ class ArrayFlow:
 	"""
 
 	values: jax.Array
-	unit: spu.Quantity | None
+	unit: spu.Quantity | None = None
+
+	def correct_unit(self, real_unit: spu.Quantity) -> typ.Self:
+		if self.unit is not None:
+			return ArrayFlow(values=self.values, unit=real_unit)
+
+		msg = f'Tried to correct unit of unitless LazyDataValueRange "{real_unit}"'
+		raise ValueError(msg)
+
+	def rescale_to_unit(self, unit: spu.Quantity) -> typ.Self:
+		if self.unit is not None:
+			return ArrayFlow(
+				values=float(spux.scaling_factor(self.unit, unit)) * self.values,
+				unit=unit,
+			)
+			## TODO: Is this scaling numerically stable?
+
+		msg = f'Tried to rescale unitless LazyDataValueRange to unit {unit}'
+		raise ValueError(msg)
 
 
 ####################
@@ -213,14 +231,26 @@ class LazyArrayRangeFlow:
 	steps: int
 	scaling: typx.Literal['lin', 'geom', 'log'] = 'lin'
 
-	has_unit: bool = False
-	unit: spu.Quantity = False
+	unit: spu.Quantity | None = False
 
-	def rescale_to_unit(self, unit: spu.Quantity) -> typ.Self:
-		if self.has_unit:
+	def correct_unit(self, real_unit: spu.Quantity) -> typ.Self:
+		if self.unit is not None:
+			return LazyArrayRangeFlow(
+				symbols=self.symbols,
+				unit=real_unit,
+				start=self.start,
+				stop=self.stop,
+				steps=self.steps,
+				scaling=self.scaling,
+			)
+
+		msg = f'Tried to correct unit of unitless LazyDataValueRange "{real_unit}"'
+		raise ValueError(msg)
+
+	def rescale_to_unit(self, unit: spu.Quantity) -> typ.Self:
+		if self.unit is not None:
 			return LazyArrayRangeFlow(
 				symbols=self.symbols,
-				has_unit=self.has_unit,
 				unit=unit,
 				start=spu.convert_to(self.start, unit),
 				stop=spu.convert_to(self.stop, unit),
@@ -239,7 +269,6 @@ class LazyArrayRangeFlow:
 		"""Call a function on both bounds (start and stop), creating a new `LazyDataValueRange`."""
 		return LazyArrayRangeFlow(
 			symbols=self.symbols,
-			has_unit=self.has_unit,
 			unit=self.unit,
 			start=spu.convert_to(
 				bound_cb(self.start if not reverse else self.stop), self.unit
@@ -255,7 +284,7 @@ class LazyArrayRangeFlow:
 		self, symbol_values: dict[sp.Symbol, ValueFlow] = MappingProxyType({})
 	) -> ArrayFlow:
 		# Realize Symbols
-		if not self.has_unit:
+		if self.unit is None:
 			start = spux.sympy_to_python(self.start.subs(symbol_values))
 			stop = spux.sympy_to_python(self.stop.subs(symbol_values))
 		else:

src/blender_maxwell/node_trees/maxwell_sim_nodes/node_tree.py

@@ -347,6 +347,8 @@ class MaxwellSimTree(bpy.types.NodeTree):
 				consent_removal = to_socket.allow_remove_link(from_socket)
 				if not consent_removal:
 					link_corrections['to_add'].append((from_socket, to_socket))
+				else:
+					to_socket.on_link_removed(from_socket)
 
 			# Ensure Removal of Socket PTRs, PTRs->REFs
 			self.node_link_cache.remove_sockets_by_link_ptr(link_ptr)

src/blender_maxwell/node_trees/maxwell_sim_nodes/nodes/base.py

@@ -192,7 +192,6 @@ class MaxwellSimNode(bpy.types.Node):
 				'active_socket_set',
 				bpy.props.EnumProperty,
 				name='Active Socket Set',
-				description='Selector of active sockets',
 				items=[
 					(socket_set_name, socket_set_name, socket_set_name)
 					for socket_set_name in socket_set_names
@@ -742,13 +741,13 @@ class MaxwellSimNode(bpy.types.Node):
 	) -> None:
 		"""Draws the UI of the node.
 
-		- Locked (`self.locked`): The UI will be unusable.
-		- Active Preset (`self.active_preset`): The preset selector will display.
-		- Active Socket Set (`self.active_socket_set`): The socket set selector will display.
-		- Use Sim Node Name (`self.use_sim_node_name`): The "Sim Node Name will display.
-		- Properties (`self.draw_props()`): Node properties will display.
-		- Operators (`self.draw_operators()`): Node operators will display.
-		- Info (`self.draw_operators()`): Node information will display.
+		- **Locked** (`self.locked`): The UI will be unusable.
+		- **Active Preset** (`self.active_preset`): The preset selector will display.
+		- **Active Socket Set** (`self.active_socket_set`): The socket set selector will display.
+		- **Use Sim Node Name** (`self.use_sim_node_name`): The `self.sim_node_name` will display.
+		- **Properties**: Node properties will display, if `self.draw_props()` is overridden.
+		- **Operators**: Node operators will display, if `self.draw_operators()` is overridden.
+		- **Info**: Node information will display, if `self.draw_info()` is overridden.
 
 		Parameters:
 			context: The current Blender context.

src/blender_maxwell/node_trees/maxwell_sim_nodes/sockets/base.py

@@ -125,6 +125,7 @@ class MaxwellSimSocket(bpy.types.NodeSocket):
 	####################
 	# - Initialization
 	####################
+	## TODO: Common implementation of this for both sockets and nodes - perhaps a BLInstance base class?
 	@classmethod
 	def set_prop(
 		cls,
@@ -183,103 +184,84 @@ class MaxwellSimSocket(bpy.types.NodeSocket):
 
 		# Configure Use of Units
 		if cls.use_units:
-			# Set Shape :)
-			cls.socket_shape += '_DOT'
-
 			if not (socket_units := ct.SOCKET_UNITS.get(cls.socket_type)):
-				msg = 'Tried to `use_units` on {cls.bl_idname} socket, but `SocketType` has no units defined in `contracts.SOCKET_UNITS`'
+				msg = f'Tried to define "use_units" on socket {cls.bl_label} socket, but there is no unit for {cls.socket_type} defined in "contracts.SOCKET_UNITS"'
 				raise RuntimeError(msg)
 
-			# Current Unit
-			cls.__annotations__['active_unit'] = bpy.props.EnumProperty(
+			cls.set_prop(
+				'active_unit',
+				bpy.props.EnumProperty,
 				name='Unit',
-				description='Choose a unit',
 				items=[
 					(unit_name, str(unit_value), str(unit_value))
 					for unit_name, unit_value in socket_units['values'].items()
 				],
 				default=socket_units['default'],
-				update=lambda self, _: self.sync_unit_change(),
 			)
-
-			# Previous Unit (for conversion)
-			cls.__annotations__['prev_active_unit'] = bpy.props.StringProperty(
+			cls.set_prop(
+				'prev_active_unit',
+				bpy.props.StringProperty,
 				default=socket_units['default'],
 			)
 
 	####################
-	# - Event Chain
+	# - Property Event: On Update
 	####################
-	def trigger_event(
-		self,
-		event: ct.FlowEvent,
-	) -> None:
-		"""Called whenever the socket's output value has changed.
+	def _on_active_kind_changed(self) -> None:
+		"""Matches the display shape to the active `FlowKind`.
 
-		This also invalidates any of the socket's caches.
-
-		When called on an input node, the containing node's
-		`trigger_event` method will be called with this socket.
-
-		When called on a linked output node, the linked socket's
-		`trigger_event` method will be called.
+		Notes:
+			Called by `self.on_prop_changed()` when `self.active_kind` was changed.
 		"""
-		# Forwards Chains
-		if event in {ct.FlowEvent.DataChanged}:
-			## Input Socket
-			if not self.is_output:
-				self.node.trigger_event(event, socket_name=self.name)
+		self.display_shape = (
+			'SQUARE'
+			if self.active_kind in {ct.FlowKind.LazyValue, ct.FlowKind.LazyValueRange}
+			else 'CIRCLE'
+		) + ('_DOT' if self.use_units else '')
 
-			## Linked Output Socket
-			elif self.is_output and self.is_linked:
-				for link in self.links:
-					link.to_socket.trigger_event(event)
+	def _on_unit_changed(self) -> None:
+		"""Synchronizes the `FlowKind` data to the newly set unit.
 
-		# Backwards Chains
-		elif event in {
-			ct.FlowEvent.EnableLock,
-			ct.FlowEvent.DisableLock,
-			ct.FlowEvent.OutputRequested,
-			ct.FlowEvent.DataChanged,
-			ct.FlowEvent.ShowPreview,
-			ct.FlowEvent.ShowPlot,
-		}:
-			if event == ct.FlowEvent.EnableLock:
-				self.locked = True
+		When a new unit is set, the internal ex. floating point properties become out of sync.
+		This function applies a rescaling operation based on the factor between the previous unit (`self.prev_unit`) and the new unit `(self.unit)`.
 
-			if event == ct.FlowEvent.DisableLock:
-				self.locked = False
+		- **Value**: Retrieve the value (with incorrect new unit), exchange the new unit for the old unit, and assign it back.
+		- **Array**: Replace the internal unit with the old (correct) unit, and rescale all values in the array to the new unit.
 
-			## Output Socket
-			if self.is_output:
-				self.node.trigger_event(event, socket_name=self.name)
+		Notes:
+			Called by `self.on_prop_changed()` when `self.active_unit` is changed.
 
-			## Linked Input Socket
-			elif not self.is_output and self.is_linked:
-				for link in self.links:
-					link.from_socket.trigger_event(event)
+			This allows for a unit-scaling operation **without needing to know anything about the data representation** (at the cost of performance).
+		"""
+		if self.active_kind == ct.FlowKind.Value:
+			self.value = self.value / self.unit * self.prev_unit
+
+		elif self.active_kind in [ct.FlowKind.Array, ct.FlowKind.LazyArrayRange]:
+			self.lazy_value_range = self.lazy_value_range.correct_unit(
+				self.prev_unit
+			).rescale_to_unit(self.unit)
+		else:
+			msg = f'Active kind {self.active_kind} has no way of scaling units (from {self.prev_active_unit} to {self.active_unit}). Please check the node definition'
+			raise RuntimeError(msg)
+
+		self.prev_active_unit = self.active_unit
 
-	####################
-	# - Event Chain: Event Handlers
-	####################
 	def sync_prop(self, prop_name: str, _: bpy.types.Context) -> None:
 		"""Called when a property has been updated.
 
 		Contrary to `node.on_prop_changed()`, socket-specific callbacks are baked into this function:
 
-		- **Active Kind** (`active_kind`): Sets the socket shape to reflect the active `FlowKind`.
+		- **Active Kind** (`self.active_kind`): Sets the socket shape to reflect the active `FlowKind`.
+		- **Unit** (`self.unit`): Corrects the internal `FlowKind` representation to match the new unit.
 
 		Attributes:
 			prop_name: The name of the property that was changed.
 		"""
 		# Property: Active Kind
 		if prop_name == 'active_kind':
-			self.display_shape(
-				'SQUARE'
-				if self.active_kind
-				in {ct.FlowKind.LazyValue, ct.FlowKind.LazyValueRange}
-				else 'CIRCLE'
-			) + ('_DOT' if self.use_units else '')
+			self._on_active_kind_changed()
+		elif prop_name == 'unit':
+			self._on_unit_changed()
 
 		# Valid Properties
 		elif hasattr(self, prop_name):
@@ -290,6 +272,9 @@ class MaxwellSimSocket(bpy.types.NodeSocket):
 			msg = f'Property {prop_name} not defined on socket {self}'
 			raise RuntimeError(msg)
 
+	####################
+	# - Link Event: Consent / On Change
+	####################
 	def allow_add_link(self, link: bpy.types.NodeLink) -> bool:
 		"""Called to ask whether a link may be added to this (input) socket.
 
@@ -300,7 +285,6 @@ class MaxwellSimSocket(bpy.types.NodeSocket):
 			In practice, the link in question has already been added.
 			This function determines **whether the new link should be instantly removed** - if so, the removal producing the _practical effect_ of the link "not being added" at all.
 
-
 		Attributes:
 			link: The node link that was already added, whose continued existance is in question.
 
@@ -341,21 +325,19 @@ class MaxwellSimSocket(bpy.types.NodeSocket):
 
 		return True
 
-	def on_link_added(self, link: bpy.types.NodeLink) -> None:
-		"""Triggers a `ct.FlowEvent.LinkChanged` event on link add.
+	def on_link_added(self, link: bpy.types.NodeLink) -> None:  # noqa: ARG002
+		"""Triggers a `ct.FlowEvent.LinkChanged` event when a link is added.
+
+		Notes:
+			Called by the node tree, generally (but not guaranteed) after `self.allow_add_link()` has given consent to add the link.
 
 		Attributes:
 			link: The node link that was added.
 				Currently unused.
-
-		Returns:
-			Whether or not consent is given to add the link.
-			In practice, the link will simply remain if consent is given.
-			If consent is not given, the new link will be removed.
 		"""
-		self.trigger_event(ct.FlowEvent.DataChanged)
+		self.trigger_event(ct.FlowEvent.LinkChanged)
 
-	def allow_remove_link(self, from_socket: bpy.types.NodeSocket) -> bool:
+	def allow_remove_link(self, from_socket: bpy.types.NodeSocket) -> bool:  # noqa: ARG002
 		"""Called to ask whether a link may be removed from this `to_socket`.
 
 		- **Locked**: Locked sockets may not have links removed.
@@ -386,9 +368,67 @@ class MaxwellSimSocket(bpy.types.NodeSocket):
 		if self.locked:
 			return False
 
-		self.trigger_event(ct.FlowEvent.DataChanged)
 		return True
 
+	def on_link_removed(self, from_socket: bpy.types.NodeSocket) -> None:  # noqa: ARG002
+		"""Triggers a `ct.FlowEvent.LinkChanged` event when a link is removed.
+
+		Notes:
+			Called by the node tree, generally (but not guaranteed) after `self.allow_remove_link()` has given consent to remove the link.
+
+		Attributes:
+			from_socket: The node socket that was attached to before link removal.
+				Currently unused.
+		"""
+		self.trigger_event(ct.FlowEvent.LinkChanged)
+
+	####################
+	# - Event Chain
+	####################
+	def trigger_event(
+		self,
+		event: ct.FlowEvent,
+	) -> None:
+		"""Recursively triggers an event along the node tree, depending on whether the socket is an input or output socket.
+
+		Notes:
+			This can be an unpredictably heavy function, depending on the node graph topology.
+
+		Parameters:
+			event: The event to report along the node tree.
+				The value of `ct.FlowEvent.flow_direction[event]` must match either `input` or `output`, depending on whether the socket is input/output.
+		"""
+		flow_direction = ct.FlowEvent.flow_direction[event]
+
+		# Input Socket | Input Flow
+		if not self.is_output and flow_direction == 'input':
+			if event in [ct.FlowEvent.EnableLock, ct.FlowEvent.DisableLock]:
+				self.locked = event == ct.FlowEvent.EnableLock
+
+			for link in self.links:
+				link.from_socket.trigger_event(event)
+
+		# Input Socket | Output Flow
+		if not self.is_output and flow_direction == 'output':
+			## THIS IS A WORKAROUND (bc Node only understands DataChanged)
+			## TODO: Handle LinkChanged on the node.
+			if event == ct.FlowEvent.LinkChanged:
+				self.node.trigger_event(ct.FlowEvent.DataChanged, socket_name=self.name)
+
+			self.node.trigger_event(event, socket_name=self.name)
+
+		# Output Socket | Input Flow
+		if self.is_output and flow_direction == 'input':
+			if event in [ct.FlowEvent.EnableLock, ct.FlowEvent.DisableLock]:
+				self.locked = event == ct.FlowEvent.EnableLock
+
+			self.node.trigger_event(event, socket_name=self.name)
+
+		# Output Socket | Output Flow
+		if self.is_output and flow_direction == 'output':
+			for link in self.links:
+				link.to_socket.trigger_event(event)
+
 	####################
 	# - Data Chain
 	####################
@@ -437,7 +477,7 @@ class MaxwellSimSocket(bpy.types.NodeSocket):
 	def lazy_array_range(self, value: tuple[ct.DataValue, ct.DataValue, int]) -> None:
 		raise NotImplementedError
 
-	# LazyArrayRange
+	# Param
 	@property
 	def param(self) -> ct.ParamsFlow:
 		raise NotImplementedError
@@ -446,6 +486,15 @@ class MaxwellSimSocket(bpy.types.NodeSocket):
 	def param(self, value: tuple[ct.DataValue, ct.DataValue, int]) -> None:
 		raise NotImplementedError
 
+	# Info
+	@property
+	def info(self) -> ct.ParamsFlow:
+		raise NotImplementedError
+
+	@info.setter
+	def info(self, value: tuple[ct.DataValue, ct.DataValue, int]) -> None:
+		raise NotImplementedError
+
 	####################
 	# - Data Chain Computation
 	####################
@@ -546,41 +595,19 @@ class MaxwellSimSocket(bpy.types.NodeSocket):
 
 		self.active_unit = matching_unit_names[0]
 
-	def sync_unit_change(self) -> None:
-		"""In unit-aware sockets, the internal `value()` property multiplies the Blender property value by the current active unit.
-
-		When the unit is changed, `value()` will display the old scalar with the new unit.
-		To fix this, we need to update the scalar to use the new unit.
-
-		Can be overridden if more specific logic is required.
-		"""
-		if self.active_kind == ct.FlowKind.Value:
-			self.value = self.value / self.unit * self.prev_unit
-
-		elif self.active_kind == ct.FlowKind.LazyValueRange:
-			lazy_value_range = self.lazy_value_range
-			self.lazy_value_range = (
-				lazy_value_range.start / self.unit * self.prev_unit,
-				lazy_value_range.stop / self.unit * self.prev_unit,
-				lazy_value_range.steps,
-			)
-
-		self.prev_active_unit = self.active_unit
-
 	####################
-	# - Style
+	# - Theme
 	####################
-	def draw_color(
-		self,
-		context: bpy.types.Context,
-		node: bpy.types.Node,
-	) -> ct.BLColorRGBA:
-		"""Color of the socket icon, when embedded in a node."""
-		return self.socket_color
-
 	@classmethod
 	def draw_color_simple(cls) -> ct.BLColorRGBA:
-		"""Fallback color of the socket icon (ex.when not embedded in a node)."""
+		"""Sets the socket's color to `cls.socket_color`.
+
+		Notes:
+			Blender calls this method to determine the socket color.
+
+		Returns:
+			A Blender-compatible RGBA value, with no explicit color space.
+		"""
 		return cls.socket_color
 
 	####################
@@ -593,7 +620,17 @@ class MaxwellSimSocket(bpy.types.NodeSocket):
 		node: bpy.types.Node,
 		text: str,
 	) -> None:
-		"""Called by Blender to draw the socket UI."""
+		"""Draw the socket UI.
+
+		- **Input Socket**: Will use `self.draw_input()`.
+		- **Output Socket**: Will use `self.draw_output()`.
+
+		Parameters:
+			context: The current Blender context.
+			layout: Target for defining UI elements.
+			node: The node within which the socket is embedded.
+			text: The socket's name in the UI.
+		"""
 		if self.is_output:
 			self.draw_output(context, layout, node, text)
 		else:
@@ -606,8 +643,21 @@ class MaxwellSimSocket(bpy.types.NodeSocket):
 		node: bpy.types.Node,
 		text: str,
 	) -> None:
-		pass
+		"""Draw the "prelock" UI, which is usable regardless of the `self.locked` state.
 
+		Notes:
+			If a "prelock" UI is needed by a socket, it should set `self.use_prelock` and override this method.
+
+		Parameters:
+			context: The current Blender context.
+			col: Target for defining UI elements.
+			node: The node within which the socket is embedded.
+			text: The socket's name in the UI.
+		"""
+
+	####################
+	# - UI: Input / Output Socket
+	####################
 	def draw_input(
 		self,
 		context: bpy.types.Context,
@@ -615,7 +665,23 @@ class MaxwellSimSocket(bpy.types.NodeSocket):
 		node: bpy.types.Node,
 		text: str,
 	) -> None:
-		"""Draws the socket UI, when the socket is an input socket."""
+		"""Draw the UI of the input socket.
+
+		- **Locked** (`self.locked`): The UI will be unusable.
+		- **Linked** (`self.is_linked`): Only the socket label will display.
+		- **Use Units** (`self.use_units`): The currently active unit will display as a dropdown menu.
+		- **Use Prelock** (`self.use_prelock`): The "prelock" UI drawn with `self.draw_prelock()`, which shows **regardless of `self.locked`**.
+		- **FlowKind**: The `FlowKind`-specific UI corresponding to the current `self.active_kind`.
+
+		Notes:
+			Shouldn't be overridden.
+
+		Parameters:
+			context: The current Blender context.
+			layout: Target for defining UI elements.
+			node: The node within which the socket is embedded.
+			text: The socket's name in the UI.
+		"""
 		col = layout.column(align=False)
 
 		# Label Row
@@ -653,25 +719,33 @@ class MaxwellSimSocket(bpy.types.NodeSocket):
 		elif self.locked:
 			row.enabled = False
 
-		# Data Column(s)
+		# FlowKind Column(s)
 		col = row.column(align=True)
 		{
 			ct.FlowKind.Value: self.draw_value,
-			ct.FlowKind.ValueArray: self.draw_value_array,
-			ct.FlowKind.ValueSpectrum: self.draw_value_spectrum,
+			ct.FlowKind.Array: self.draw_value_array,
 			ct.FlowKind.LazyValue: self.draw_lazy_value,
 			ct.FlowKind.LazyValueRange: self.draw_lazy_value_range,
-			ct.FlowKind.LazyValueSpectrum: self.draw_lazy_value_spectrum,
 		}[self.active_kind](col)
 
 	def draw_output(
 		self,
-		context: bpy.types.Context,
+		context: bpy.types.Context,  # noqa: ARG002
 		layout: bpy.types.UILayout,
-		node: bpy.types.Node,
+		node: bpy.types.Node,  # noqa: ARG002
 		text: str,
 	) -> None:
-		"""Draws the socket UI, when the socket is an output socket."""
+		"""Draw the label text on the output socket.
+
+		Notes:
+			Shouldn't be overridden.
+
+		Parameters:
+			context: The current Blender context.
+			layout: Target for defining UI elements.
+			node: The node within which the socket is embedded.
+			text: The socket's name in the UI.
+		"""
 		layout.label(text=text)
 
 	####################
@@ -682,29 +756,53 @@ class MaxwellSimSocket(bpy.types.NodeSocket):
 		row: bpy.types.UILayout,
 		text: str,
 	) -> None:
-		"""Called to draw the label row (same height as socket shape).
+		"""Draw the label row, which is at the same height as the socket shape.
 
-		Can be overridden.
+		Notes:
+			Can be overriden by individual socket classes, if they need to alter the way that the label row is drawn.
+
+		Parameters:
+			row: Target for defining UI elements.
+			text: The socket's name in the UI.
 		"""
 		row.label(text=text)
 
-	####################
-	# - FlowKind draw() Methods
-	####################
 	def draw_value(self, col: bpy.types.UILayout) -> None:
-		pass
+		"""Draws the socket value on its own line.
 
-	def draw_value_array(self, col: bpy.types.UILayout) -> None:
-		pass
+		Notes:
+			Should be overriden by individual socket classes, if they have an editable `FlowKind.Value`.
 
-	def draw_value_spectrum(self, col: bpy.types.UILayout) -> None:
-		pass
+		Parameters:
+			col: Target for defining UI elements.
+		"""
+
+	def draw_array(self, col: bpy.types.UILayout) -> None:
+		"""Draws the socket array on its own line.
+
+		Notes:
+			Should be overriden by individual socket classes, if they have an editable `FlowKind.Array`.
+
+		Parameters:
+			col: Target for defining UI elements.
+		"""
 
 	def draw_lazy_value(self, col: bpy.types.UILayout) -> None:
-		pass
+		"""Draws the socket lazy value on its own line.
 
-	def draw_lazy_value_range(self, col: bpy.types.UILayout) -> None:
-		pass
+		Notes:
+			Should be overriden by individual socket classes, if they have an editable `FlowKind.LazyValue`.
 
-	def draw_lazy_value_spectrum(self, col: bpy.types.UILayout) -> None:
-		pass
+		Parameters:
+			col: Target for defining UI elements.
+		"""
+
+	def draw_lazy_array_range(self, col: bpy.types.UILayout) -> None:
+		"""Draws the socket lazy array range on its own line.
+
+		Notes:
+			Should be overriden by individual socket classes, if they have an editable `FlowKind.LazyArrayRange`.
+
+		Parameters:
+			col: Target for defining UI elements.
+		"""

src/blender_maxwell/nodeps/utils/pydeps.py

@@ -4,7 +4,8 @@ import os
 import sys
 from pathlib import Path
 
-from ... import info
+import blender_maxwell.contracts as ct
+
 from . import simple_logger
 
 log = simple_logger.get(__name__)
@@ -30,8 +31,8 @@ def importable_addon_deps(path_deps: Path):
 			yield
 		finally:
 			pass
-			#log.info('Removing Path from sys.path: %s', str(os_path))
-			#sys.path.remove(os_path)
+			# log.info('Removing Path from sys.path: %s', str(os_path))
+			# sys.path.remove(os_path)
 	else:
 		try:
 			yield
@@ -43,7 +44,7 @@ def importable_addon_deps(path_deps: Path):
 def syspath_from_bpy_prefs() -> bool:
 	import bpy
 
-	addon_prefs = bpy.context.preferences.addons[info.ADDON_NAME].preferences
+	addon_prefs = bpy.context.preferences.addons[ct.addon.NAME].preferences
 	if hasattr(addon_prefs, 'path_addon_pydeps'):
 		log.info('Retrieved PyDeps Path from Addon Prefs')
 		path_pydeps = addon_prefs.path_addon_pydeps
@@ -67,7 +68,7 @@ def _check_pydeps(
 	"""
 
 	def conform_pypi_package_deplock(deplock: str):
-		"""Conforms a <package>==<version> de-lock to match if pypi considers them the same (PyPi is case-insensitive and considers -/_ to be the same)
+		"""Conforms a <package>==<version> de-lock to match if pypi considers them the same (PyPi is case-insensitive and considers -/_ to be the same).
 
 		See <https://peps.python.org/pep-0426/#name>
 		"""
@@ -127,7 +128,7 @@ def check_pydeps(path_deps: Path):
 	global DEPS_OK  # noqa: PLW0603
 	global DEPS_ISSUES  # noqa: PLW0603
 
-	if len(issues := _check_pydeps(info.PATH_REQS, path_deps)) > 0:
+	if len(issues := _check_pydeps(ct.addon.PATH_REQS, path_deps)) > 0:
 		log.info('PyDeps Check Failed')
 		log.debug('%s', ', '.join(issues))
 

src/blender_maxwell/utils/extra_sympy_units.py

@@ -105,6 +105,11 @@ def parse_abbrev_symbols_to_units(expr: sp.Basic) -> sp.Basic:
 ####################
 # - Units <-> Scalars
 ####################
+def scaling_factor(unit_from: spu.Quantity, unit_to: spu.Quantity) -> sp.Basic:
+	if unit_from.dimension == unit_to.dimension:
+		return spu.convert_to(unit_from, unit_to) / unit_to
+
+
 def scale_to_unit(expr: sp.Expr, unit: spu.Quantity) -> typ.Any:
 	## TODO: An LFU cache could do better than an LRU.
 	unitless_expr = spu.convert_to(expr, unit) / unit