更新

Python-100-Days/Day01-15/Day09/association.py

@@ -0,0 +1,73 @@
+"""
+
+对象之间的关联关系
+
+Version: 0.1
+Author: 骆昊
+Date: 2018-03-12
+
+"""
+
+from math import sqrt
+
+
+class Point(object):
+
+	def __init__(self, x=0, y=0):
+		self._x = x
+		self._y = y
+
+	def move_to(self, x, y):
+		self._x = x
+		self._y = y
+
+	def move_by(self, dx, dy):
+		self._x += dx
+		self._y += dy
+
+	def distance_to(self, other):
+		dx = self._x - other._x
+		dy = self._y - other._y
+		return sqrt(dx ** 2 + dy ** 2)
+
+	def __str__(self):
+		return '(%s, %s)' % (str(self._x), str(self._y))
+
+
+class Line(object):
+
+	def __init__(self, start=Point(0, 0), end=Point(0, 0)):
+		self._start = start
+		self._end = end
+
+	@property
+	def start(self):
+		return self._start
+
+	@start.setter
+	def start(self, start):
+		self._start = start
+
+	@property
+	def end(self):
+		return self.end
+
+	@end.setter
+	def end(self, end):
+		self._end = end
+
+	@property
+	def length(self):
+		return self._start.distance_to(self._end)
+
+
+if __name__ == '__main__':
+	p1 = Point(3, 5)
+	print(p1)
+	p2 = Point(-2, -1.5)
+	print(p2)
+	line = Line(p1, p2)
+	print(line.length)
+	line.start.move_to(2, 1)
+	line.end = Point(1, 2)
+	print(line.length)