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78 lines
1.4 KiB
Python
78 lines
1.4 KiB
Python
from typing import TypeVar
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from abc import ABCMeta, abstractmethod
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from ..error import PatternError
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from ..utils import is_scalar
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T = TypeVar('T', bound='Scalable')
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I = TypeVar('I', bound='ScalableImpl')
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class Scalable(metaclass=ABCMeta):
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"""
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Abstract class for all scalable entities
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"""
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__slots__ = ()
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'''
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---- Abstract methods
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'''
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@abstractmethod
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def scale_by(self: T, c: float) -> T:
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"""
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Scale the entity by a factor
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Args:
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c: scaling factor
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Returns:
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self
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"""
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pass
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class ScalableImpl(Scalable, metaclass=ABCMeta):
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"""
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Simple implementation of Scalable
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"""
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__slots__ = ()
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_scale: float
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""" scale factor for the entity """
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'''
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---- Properties
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'''
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@property
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def scale(self) -> float:
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return self._scale
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@scale.setter
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def scale(self, val: float):
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if not is_scalar(val):
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raise PatternError('Scale must be a scalar')
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if not val > 0:
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raise PatternError('Scale must be positive')
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self._scale = val
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'''
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---- Methods
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'''
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def scale_by(self: I, c: float) -> I:
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self.scale *= c
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return self
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def set_scale(self: I, scale: float) -> I:
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"""
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Set the sclae to a value
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Args:
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scale: absolute scale factor
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Returns:
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self
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"""
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self.scale = scale
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return self
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