Class Diagram Viewer
Create diagrams to investigate class details and hierarchies
Description
The Class Diagram Viewer enables you to create class diagrams that show implementation details and hierarchies. You can use this tool to explore class structures and share class diagrams with others. These diagrams can include details about:
The internal structure of classes, including properties and methods and their access attributes
The hierarchy of classes, including packages, with inheritance relationships shown graphically
You can create class diagrams using the graphical interface or the command line API
defined by matlab.diagram.ClassViewer.
Open the Class Diagram Viewer
MATLAB® command prompt:
matlab.diagram.ClassViewerOn the Project tab, click the tool icon
Examples
Create and Save Simple Class Diagram
Open the Class Diagram Viewer. In the Class Browser pane,
expand the add icon 
and select Add Package.
Enter matlab.unittest as the package name and click
OK. The folder for unittest appears in the
Class Browser.
Expand the unittest folder and select the
InteractiveTestCase class. To do this, click the
Add button in the toolbar to add a card for the class to the
Class Diagram Viewer canvas. Add the TestCase
class using the same method, and click Auto Arrange. Because
TestCase is the superclass of InteractiveTestCase, Class
Diagram Viewer automatically draws an arrow from InteractiveTestCase to
TestCase to show this relationship.
The striped blue borders at the top of the class cards indicate that both of these classes are handle classes. The Legend pane describes what the graphic effects and icons on the canvas represent.
You can also drag and drop items from the Class Browser directly to the canvas. Drag
and drop the Test class to the viewer. The 
button indicates that Test has a
viewable superclass.
Click the button to add the superclass to the diagram. The arrow pointing to
TestSuite from Test indicates that
TestSuite is a superclass of Test.
In addition to moving the classes in the viewer by dragging and dropping, you can customize the view using the options in the Navigate section of the toolbar, including:
Zoom in and out
Fit the model to current screen size
Pan
In the Diagram section, select the Mixins check box. This action does not automatically add mixin classes to the diagram, but it includes them in the display when you perform any action that adds superclasses.
To add the immediate superclass of Test, right-click the
Test class card and select Superclass. Click
Auto Arrange to clean up the diagram. The
CustomDisplay mixin now appears as a superclass of Test.
The name of CustomDisplay is italicized, indicating that it is an
abstract class.
In addition to relationships between classes, you can also explore the class
definitions themselves. Expand the Test class card by clicking the arrow
next to the class name in its card. The class card expands to show the properties and
methods defined by the class. Properties and methods inherited from superclasses do not
appear in the subclass cards.
The icons next to the property and method names also identify the access levels of
the properties and methods. For example, the lock icon shows that
TestCaseProvider is a private property.
Selecting a property or method on the class card also brings up access and other information in the Inspector pane.
To view the source code of one or more classes, select their cards and click Go To Source in the toolbar. The source code files open in the MATLAB editor.
To save or share the diagram you create, use one of two options:
Click Export to save the diagram as a static image.
Select Save > Save as... to create an MLDATX file that can be reopened in a Class Diagram Viewer instance and edited.
Programmatic Use
Tips
Class Diagram Viewers are instances of the
matlab.diagram.ClassViewerclass. Use the class constructors to open more than one viewer at a time.When the
button appears on an arrow between two classes, rather
than on a class card itself, there are additional classes in the hierarchy between the two
connected classes. Click the button to add all of the viewable classes in that part of
the hierarchy.If you make changes to the class code while using the Class Diagram Viewer, you can automatically update the diagram by clicking Refresh.