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我正在尝试在 MATLAB 2017b 中创建一个类似于 Line 对象类的类，但析构函数有问题。我想与其他图形对象实现类似的行为，当删除句柄时不再引用该对象，如下例所示：

 >> l1 = line([0 1], [0 1]);

如果包含线的图形l1现在已关闭，则变量显示它l1正在引用已删除的对象：

>> l1

l1 = 

  handle to deleted Line

我创建了以下类：

classdef circle < handle ...
        & matlab.mixin.CustomDisplay & matlab.mixin.SetGet

    properties
        Center = [];
        Color = [0 0.4470 0.7410];
        Radius = [];
    end

    properties (SetAccess = 'protected')
        LineHandle = [];
    end

    methods
        function obj = circle(radius, center, varargin)
            if nargin > 0
                % assign property values
                obj.Radius = radius;
                obj.Center = center;

                % generate plotting variables
                phi = linspace(0, 2*pi, 90);
                x = radius*cos(phi) + center(1);
                y = radius*sin(phi) + center(2);

                % draw circle
                obj.LineHandle = line(x, y);

                % create listeners in line object
                obj.createListener;

                % set variable properties
                for k = 1:2:length(varargin)
                    % set superclass properties
                    if (isprop(obj.LineHandle, varargin{k}))
                        set(obj.LineHandle, varargin{k},varargin{k+1});
                        if (isprop(obj, varargin{k}))
                            set(obj, varargin{k}, varargin{k+1});
                        end
                    end        
                end
            end
        end

        % listener to invoke delete if line is closed
        function createListener(obj)         
            set(obj.LineHandle,'DeleteFcn',...
                @obj.delete);
        end

         function delete(obj,varargin)
            disp('deleted')
            %%%%%%%%%%%%%%%%%%%%%%%%%%%%%
            % command to delete class ???
            %%%%%%%%%%%%%%%%%%%%%%%%%%%%%
         end

    end

end

如果包含圆形对象的图形是闭合的，则该线被删除，但圆形对象仍然存在。有没有办法同时删除对圆对象的引用？

4

1 回答 1

0

我自己找到了答案。该函数只需要具有与删除不同的名称：

function delete_obj(obj, varargin)
        % delete handle
        delete(obj)
end
于 2018-08-17T12:31:26.880 回答