def from_config(cls, config, scene=None, tag=None):
"""Alternate constructor.
Args:
config (dict): Configuration dictionary
Returns:
:class:`.Polycurve`: new Polycurve instance
"""
if tag is None:
tag = config.get('tag')
region = cls(scene=scene, tag=tag)
curves_config = config['curves']
M_start = Point.from_config(curves_config[0]['M1'])
region.start(M_start)
region.tag = config.get('tag')
region.n = config['n']
for curve_config in curves_config:
cls = curve_config['Class']
if cls == 'Segment':
M_next = Point.from_config(curve_config['M2'])
region.add_line(M_next)
elif cls == 'Arc':
M_next = Point.from_config(curve_config['M2'])
tangent = Vector.from_config(curve_config['tangent'])
region.add_arc(M_next, tangent)
else:
raise (NotImplementedError)
# normally, the stored polycurves are already closed
# (the last point is equal to the first one)
# no need for a final close()
return region
def from_config(cls, config):
"""Alternate constructor.
Args:
config (dict): Configuration dictionary
Returns:
Line: new Line instance
Examples:
>>> from geoptics.elements.vector import Point, Vector
>>> p = Point(10, 20)
>>> u = Vector(30, 60)
>>> line1 = Line(p, u)
>>> config = line1.config
>>> line2 = Line.from_config(config)
>>> line2.config == config
True
"""
p = Point.from_config(config['p'])
u = Vector.from_config(config['u'])
return cls(p, u)