Object Oriented Programming: How to create a child class that gives two parameters for working of parent class in Matlab?

Parent class that created a 3D model

classdef shape

    properties
        name
        color
        opacity
        vertices
        faces
    end

    methods
        function plot= shape(faces,vertices,color,opacity)
            
            patch(faces,vertices,color,'FaceAlpha',opacity)
        end
   
    end


end

now,

next should be child class that gives two parameters 'faces' and 'vertices' to parent class

I tried this :-

classdef cube_shape < shape_1
   

    properties
        e
    end

    methods 
        function x= cube_shape(e)
            
            x.e=e;         % Edge length
            v1=[0 0 0];    % 8 vertices of cube 
            v2=[e 0 0];
            v3=[e e 0];
            v4=[0 e 0];
            v5=[0 0 e];
            v6=[e 0 e];
            v7=[e e e];
            v8=[0 e e];
            
            x.vertices =[v1;v2;v3;v4;v5;v6;v7;v8]; % combining 8 vertices together
            
            x.faces=[1 2 3 4 1;                % 6 faces of cube
                     5 6 7 8 5;
                     1 5 8 4 1;
                     1 5 6 2 1;
                     2 6 7 3 2;
                     3 7 8 4 3];
        end
    end   
end

How do i use this x.vertices and x.faces in parent class?

Answer 1

[Matt J]

I had to make a number of changes to your code (see attached). However, once you've implemented the classes this way, you can do things like,

obj=cube_shape(1,'r',0.5);

obj.color='g';

[Samson David Puthenpeedika]

But if I implement a code in command window , i am getting a error

[Matt J]

Make sure you have my latest version. Also, here is a slightly more advanced version with a bit more security on the way vertices can be set.

[Samson David Puthenpeedika]

Thankyou Sir ....It works really well....I am new to oops so having trouble in getting it right.

[Walter Roberson]

@Matt J

Did you happen to specifically ensure that the faces order was counter-clockwise so that the normals could be calculated properly for lighting purposes?

The code I posted in https://www.mathworks.com/matlabcentral/answers/892652-anybody-help-me-by-providing-matlab-code-for-the-three-dimensional-histograms#answer_863405 uses a different order for the vertices, so we are potentially producing the same outcome. When I created that code, I made sure that I used counter-clockwise consistently.

[Matt J]

No, I kept the face ordering specified in the OP.