Matlab装饰模式

装饰器模式（Decorator Pattern）允许向一个现有的对象添加新的功能，同时又不改变其结构。根据https://www.runoob.com/design-pattern/decorator-pattern.html所给的例子，本人用Matlab语言写了装饰器模式

Shape.m

classdef Shape < handle
    methods(Abstract)        
        draw(obj);
    end
end

Circle.m

classdef Circle < Shape
    methods
        function draw(~)
           disp('Shape: Circle');
        end
    end
end

Rectangle.m

classdef Rectangle < Shape
    methods
        function draw(~)
            disp('Shape: Rectangle')
        end
    end
end

ShapeDecorator.m

classdef ShapeDecorator < Shape
    properties
        shape
    end
    
    methods
        function obj = ShapeDecorator(shape)
            obj.shape=shape;
        end
        function draw(obj)
            obj.shape.draw();
        end
    end
end

RedShapeDecorator.m

classdef RedShapeDecorator < ShapeDecorator
    methods
        function obj = RedShapeDecorator(shape)
            obj = obj@ShapeDecorator(shape);
        end
        function draw(obj)
            draw@ShapeDecorator(obj);
            disp('Border Color:Red');
        end
    end
end

测试代码：

circle = Circle();
redCircle =RedShapeDecorator(Circle());
redRectangle = RedShapeDecorator(Rectangle());
 
disp('Circle with normal border');
circle.draw();
 
disp('Circle of red border');
redCircle.draw();
 
disp('Rectangle of red border');
redRectangle.draw();