设计模式之组合模式

设计模式之组合模式：

from abc import ABCMeta,abstractmethod

# ---------------------构造一个标准类
class Draw(metaclass=ABCMeta):
    @abstractmethod
    def draw(self):
        pass
    @abstractmethod
    def add(self,draw):
        pass
    @abstractmethod
    def getchildren(self):
        pass


# 注意本环境是在二维环境下实现的,其他环境可自行实现
# ---------------------构造一个点
class Point(Draw):
    # 点,平面上的点用一个坐标来表示
    def __init__(self,x,y):
        self.x = x
        self.y = y
    def draw(self):
        print(self)
    def add(self,draw):
        # 点的坐标是唯一的
        raise TypeError
    def getchildren(self):
        return [self.x,self.y]
    def __str__(self):
        return '点: (%s, %s)'%(self.x,self.y)




# --------------------构造一个线
class Line(Draw):
    #线,线用两个点来表示
    def __init__(self,point1,point2):
        self.ponit1 = point1
        self.ponit2 = point2
        self.k = (self.ponit2.y - self.ponit1.y) / (self.ponit2.x - self.ponit1.x)
    def draw(self):
        print(self)
    def add(self,draw):
        raise TypeError
    def getchildren(self):
        return [self.ponit1,self.ponit2]
    def __str__(self):
        return '线：[%s, %s]'%(self.ponit1,self.ponit2)




# --------------------构造一个面
class Surface(Draw):
    def __init__(self):
        self.children = dict()
    def add(self,draw):
        self.children[draw] = draw
    def getchildren(self):
        return self.children
    def draw(self):
        print(self)
    def __str__(self):
        return str({str(v) for v in self.children.values() })
    
# 构造一个面
surface = Surface()
p1 = Point(1,2)
p2 = Point(0,0)
p3 = Point(3,2)
p4 = Point(2,6)
line1 = Line(p1,p2)
line2 = Line(p3,p4)

surface.add(line1)
surface.add(line2)

surface.draw()
# line1.draw()