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####################################################################################################
#
# Patro - A Python library to make patterns for fashion design
# Copyright (C) 2017 Fabrice Salvaire
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
####################################################################################################
####################################################################################################
from .Primitive import PrimitiveNP, Primitive2DMixin
from .Segment import Segment2D
####################################################################################################
class Polyline2D(Primitive2DMixin, PrimitiveNP):
"""Class to implements 2D Polyline."""
##############################################
def __init__(self, *points):
if len(points) < 2:
raise ValueError('Polyline require at least 2 vertexes')
PrimitiveNP.__init__(self, points)
self._edges = None
##############################################
@property
def edges(self):
if self._edges is None:
for i in range(self.number_of_points -1):
edge = Segment2D(self._points[i], self._points[i+1])
self._edges.append(edge)
return iter(self._edges)
##############################################
@property
def length(self):
return sum([edge.magnitude for edge in self.edges])