[Matlab-Based Book]A Guide to MATLAB Object-Oriented Programming

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关键词：Programming Oriented Program MATLAB object

1. function this = cShape
   
2. % A Comprehensive Guide to Object Oriented Programming in MATLAB
   
3. %   Chapter 5 example Constructor
   
4. %   (c) 2004 Andy Register
   
5. this = struct( ...
   
6.     'mSize', ones(2,1),  ... % scaled [width height]’ of bounding box
   
7.     'mScale', ones(2,1), ... % [width height]’ scale factor
   
8.     'mColorHsv', rgb2hsv([0 0 1])', ... % [Hue Saturation Color]’ of border, default is blue
   
9.     'mDisplayFunc', [] ... % alternate display function fun(this, display_name)
   
10.     );
    
11. this = class(this, 'cShape');
    
12. superiorto('double')

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1. function display(this, display_name)
   
2. % A Comprehensive Guide to Object Oriented Programming in MATLAB
   
3. %   Chapter 5 example display
   
4. %   (c) 2004 Andy Register
   
5. 
   
6. if nargin < 2
   
7.     % assign 'ans' if inputname(1) empty
   
8.     display_name = inputname(1);
   
9.     if isempty(display_name)
   
10.         display_name = 'ans';
    
11.     end
    
12. end
    
13. 
    
14. % check whether mDisplayFunc has a value
    
15. % if it has a value feval the value to get the display
    
16. use_standard_view = cellfun('isempty', {this(:).mDisplayFunc});
    
17. if all(use_standard_view)
    
18.     standard_view(this, display_name);
    
19. else
    
20.     for k = 1:length(this(:))
    
21.         if use_standard_view(k)
    
22.             standard_view(this(k), display_name);
    
23.         else
    
24.             indexed_display_name = sprintf('%s(%d)', display_name, k);
    
25.             feval(this(k).mDisplayFunc, this(k), indexed_display_name);
    
26.         end
    
27.     end   
    
28. end
    
29. 
    
30. % --------------------------
    
31. function standard_view(this, display_name)
    
32. if ~isempty( ...
    
33.         [strfind(display_name, '.') ...
    
34.         strfind(display_name, '(') ...
    
35.         strfind(display_name, '{')])
    
36.     display_name = 'ans';
    
37. end
    
38. % handle a scalar vs array object
    
39. % note: [] this jumps to else
    
40. if length(this) == 1  % scalar case
    
41.     % assign values to a temporary struct
    
42.     public_struct.Size = this.mSize;
    
43.     public_struct.ColorRgb = ...
    
44.         subsref(this, substruct('.', 'ColorRgb'));
    
45.     % use eval to assign temp struct into display_name variable
    
46.     eval([display_name ' = public_struct;']);
    
47.     % use eval to call display on the display_name structure
    
48.     eval(['display(' display_name ');']);
    
49. else  % array case
    
50.     % use eval to assign this into display_name variable
    
51.     eval([display_name ' = this;']);
    
52.     % use eval to call builtin display for size info
    
53.     eval(['builtin(''display'', ' display_name ');']);
    
54.     % still need to display variable names explicitly
    
55.     disp('    with public member variables:');
    
56.     disp('        Size');
    
57.     disp('        ColorRgb');
    
58.     if strcmp(get(0, 'FormatSpacing'), 'loose')
    
59.         disp(' ');
    
60.     end
    
61. end
    
62. 
    
63. % --------------------------
    
64. function developer_view(this, display_name)
    
65. disp('-----  Public Member Variables  -----');
    
66. standard_view(this, display_name);
    
67. disp('.....  Private Member Variables  .....');
    
68. full_display(this, display_name, true);

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1. function this = mtimes(lhs, rhs)
   
2. % A Comprehensive Guide to Object Oriented Programming in MATLAB
   
3. %   Chapter 5 example mtimes
   
4. %   (c) 2004 Andy Register
   
5. 
   
6. % one input must be cShape type, which one
   
7. if isa(lhs, 'cShape')
   
8.     this = lhs;
   
9.     scale = rhs;
   
10. else
    
11.     this = rhs;
    
12.     scale = lhs;
    
13. end
    
14. 
    
15. switch length(scale(:))
    
16.     case 1
    
17.         scale = [scale; scale];
    
18.     case 2
    
19.         scale = scale(:);
    
20.     otherwise
    
21.         error('??? Error using ==> mtimes');
    
22. end
    
23. 
    
24. this.mSize = this.mSize .* scale;
    
25. this.mScale = this.mScale .* scale;

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