英文版matlab之Object handles.ppt

9.2 Object handles Each graphics object has a unique name called handle. The handle is a unique integer or real number that is used by Matlab to identify the objcet. Hndl=figure. 9.3 Examining and changing objects properties Objects properties are special values associated with an object that control some aspect of how that object behaves. Each property has a property name and an associated value. 9.3.2 Changing objects properties after creation time The get function can check the properties of any objects. Format Value=get(handle, ‘propertyName’ ); Value=get(handle); Value is the value contained in the specified property of the object whose handle is supplied. The set function is used to set the property value of specified object. Format set(handle, ‘propertyName1’,value1,…) Chapter 10 Graphical user interfaces A graphical user interface(GUI) is a pictorial interface to a program. 10.1 How a graphical user interface works 10.2 Create and display a graphical user interface 10.3 Object properties 10.4 Graphical user interface components 10.1 How a graphical user interface works Input of mouse click (or keyboard input) for any GUI element at an time is called event. A program that responds to events is known as event driven. Three principle elements required to create a Matlab GUI are: 1 components. Each item on a Matlab GUI (pushbutton, label,edit boxes) is a graphical components. 2 Figure. The components of a GUI must be arranged within a figure, which is a window on the computer screen. 3 Callback. The must be some way to perform an action if a user clicks a mouse on a button or types information on keyboard. The code executed in response to an event is known as a callback. 10.2 Create and display a graphical user interface Matlab GUIs are created using a tool called guide, the GUI development environment. The basic steps to create a Matlab GUI: 1) Decide what elements are required for the GUI and what function of each element will be. 2) Use guide(GUI develo