148 lines
3.5 KiB
Python
148 lines
3.5 KiB
Python
import typing as typ
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import bpy
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import sympy as sp
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import sympy.physics.units as spu
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import pydantic as pyd
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sp.printing.str.StrPrinter._default_settings['abbrev'] = True
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## When we str() a unit expression, use abbrevied units.
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from .. import base
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from ... import contracts
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UNITS = {
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"PM_SQ": spu.pm**2,
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"A_SQ": spu.angstrom**2,
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"NM_SQ": spu.nm**2,
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"UM_SQ": spu.um**2,
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"MM_SQ": spu.mm**2,
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"CM_SQ": spu.cm**2,
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"M_SQ": spu.m**2,
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}
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DEFAULT_UNIT = "UM_SQ"
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class PhysicalAreaBLSocket(base.BLSocket):
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socket_type = contracts.SocketType.PhysicalArea
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socket_color = (0.8, 0.5, 0.5, 1.0)
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bl_label = "Physical Area"
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compatible_types = {
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sp.Expr: {
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lambda v: v.is_real,
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lambda v: len(v.free_symbols) == 0,
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lambda v: any(
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contracts.is_exactly_expressed_as_unit(v, unit)
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for unit in UNITS.values()
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)
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},
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}
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####################
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# - Properties
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####################
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raw_value: bpy.props.FloatProperty(
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name="Unitless Area",
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description="Represents the unitless part of the area",
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default=0.0,
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precision=6,
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)
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unit: bpy.props.EnumProperty(
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name="Unit",
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description="Choose between area units",
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items=[
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(unit_name, str(unit_value), str(unit_value))
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for unit_name, unit_value in UNITS.items()
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],
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default=DEFAULT_UNIT,
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update=lambda self, context: self._update_unit(),
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)
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unit_previous: bpy.props.StringProperty(default=DEFAULT_UNIT)
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####################
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# - Socket UI
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####################
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def draw_label_row(self, label_col_row: bpy.types.UILayout, text: str) -> None:
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"""Draw the value of the area, including a toggle for
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specifying the active unit.
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"""
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label_col_row.label(text=text)
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#label_col_row.prop(self, "raw_value", text="")
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label_col_row.prop(self, "unit", text="")
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def draw_value(self, col: bpy.types.UILayout) -> None:
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col_row = col.row(align=True)
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col_row.prop(self, "raw_value", text="")
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#col_row.prop(self, "unit", text="")
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####################
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# - Computation of Default Value
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####################
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@property
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def default_value(self) -> sp.Expr:
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"""Return the area as a sympy expression, which is a pure real
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number perfectly expressed as the active unit.
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Returns:
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The area as a sympy expression (with units).
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"""
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return self.raw_value * UNITS[self.unit]
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@default_value.setter
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def default_value(self, value: typ.Any) -> None:
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"""Set the area from a sympy expression, including any required
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unit conversions to normalize the input value to the selected
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units.
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"""
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# (Guard) Value Compatibility
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if not self.is_compatible(value):
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msg = f"Tried setting socket ({self}) to incompatible value ({value}) of type {type(value)}"
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raise ValueError(msg)
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self.raw_value = spu.convert_to(
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value, UNITS[self.unit]
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) / UNITS[self.unit]
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####################
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# - Internal Update Methods
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####################
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def _update_unit(self):
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old_unit = UNITS[self.unit_previous]
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new_unit = UNITS[self.unit]
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self.raw_value = spu.convert_to(
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self.raw_value * old_unit,
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new_unit,
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) / new_unit
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self.unit_previous = self.unit
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####################
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# - Socket Configuration
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####################
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class PhysicalAreaSocketDef(pyd.BaseModel):
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socket_type: contracts.SocketType = contracts.SocketType.PhysicalArea
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label: str
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default_unit: typ.Literal[
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"PM_SQ",
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"A_SQ",
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"NM_SQ",
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"UM_SQ",
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"MM_SQ",
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"CM_SQ",
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"M_SQ",
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]
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def init(self, bl_socket: PhysicalAreaBLSocket) -> None:
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bl_socket.unit = self.default_unit
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####################
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# - Blender Registration
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####################
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BL_REGISTER = [
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PhysicalAreaBLSocket,
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]
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