| MATLAB Function Reference | |
You can set and query graphics object properties in two ways:
The The Property Editor is an interactive tool that enables you to see and change object property values.
The set and get commands enable you to set and query the values of properties.
To change the default values of properties, see Setting Default Property Values.
See Core Graphics Objects for general information about this type of object.
This section lists property names along with the type of values each accepts.
on | {off} Read Only
This object is being deleted. The BeingDeleted property provides a mechanism that you can use to determine if objects are in the process of being deleted. MATLAB sets the BeingDeleted property to on when the object's delete function callback is called (see the DeleteFcn property). It remains set to on while the delete function executes, after which the object no longer exists.
For example, an object's delete function might call other functions that act on a number of different objects. These functions may not need to perform actions on objects that are going to be deleted and, therefore, can check the object's BeingDeleted property before acting.
cancel | {queue}
Callback routine interruption. The BusyAction property enables you to control how MATLAB handles events that potentially interrupt executing callback routines. If there is a callback routine executing, callback routines invoked subsequently always attempt to interrupt it. If the Interruptible property of the object whose callback is executing is set to on (the default), then interruption occurs at the next point where the event queue is processed. If the Interruptible property is off, the BusyAction property (of the object owning the executing callback) determines how MATLAB handles the event. The choices are
cancel — Discard the event that attempted to execute a second callback routine.
queue — Queue the event that attempted to execute a second callback routine until the current callback finishes.
function handle
This property is not used on lights.
handles
The empty matrix; light objects have no children.
on | off
Clipping has no effect on light objects.
ColorSpec
Color of light. This property defines the color of the light emanating from the light object. Define it as a three-element RGB vector or one of the MATLAB predefined names. See the ColorSpec reference page for more information.
functional handle, cell array containing function handle and additional arguments, or string (not recommended)
Callback function executed during object creation. A callback function that executes when MATLAB creates a light object. You must define this property as a default value for lights or in a call to the light function to create a new light object. For example, the following statement:
set(0,'DefaultLightCreateFcn',@light_create)
defines a default value for the line CreateFcn property on the root level that sets the current figure colormap to gray and uses a reddish light color whenever you create a light object.
function light_create(src,evnt) % src - the object that is the source of the event % evnt - empty for this property set(src,'Color',[.9 .2 .2]) set(gcbf,'Colormap',gray) end
MATLAB executes this function after setting all light properties. Setting this property on an existing light object has no effect. The function must define at least two input arguments (handle of light object created and an event structure, which is empty for this property).
The handle of the object whose CreateFcn is being executed is passed by MATLAB as the first argument to the callback function and is also accessible through the root CallbackObject property, which you can query using gcbo.
See Function Handle Callbacks for information on how to use function handles to define the callback function.
functional handle, cell array containing function handle and additional arguments, or string (not recommended
Delete light callback function. A callback function that executes when you delete the light object (e.g., when you issue a delete command or clear the axes cla or figure clf). For example, the following function displays object property data before the object is deleted.
function delete_fcn(src,evnt)
% src - the object that is the source of the event
% evnt - empty for this property
obj_tp = get(src,'Type');
disp([obj_tp, ' object deleted'])
disp('Its user data is:')
disp(get(src,'UserData'))
endMATLAB executes the function before deleting the object's properties so these values are available to the callback function. The function must define at least two input arguments (handle of object being deleted and an event structure, which is empty for this property)
The handle of the object whose DeleteFcn is being executed is passed by MATLAB as the first argument to the callback function and is also accessible through the root CallbackObject property, which you can query using gcbo.
See Function Handle Callbacks for information on how to use function handles to define the callback function.
{on} | callback | off
Control access to object's handle by command-line users and GUIs. This property determines when an object's handle is visible in its parent's list of children. HandleVisibility is useful for preventing command-line users from accidentally drawing into or deleting a figure that contains only user interface devices (such as a dialog box).
Handles are always visible when HandleVisibility is on.
Setting HandleVisibility to callback causes handles to be visible from within callback routines or functions invoked by callback routines, but not from within functions invoked from the command line. This provides a means to protect GUIs from command-line users, while allowing callback routines to have complete access to object handles.
Setting HandleVisibility to off makes handles invisible at all times. This may be necessary when a callback routine invokes a function that might potentially damage the GUI (such as evaluating a user-typed string), and so temporarily hides its own handles during the execution of that function.
When a handle is not visible in its parent's list of children, it cannot be returned by functions that obtain handles by searching the object hierarchy or querying handle properties. This includes get, findobj, gca, gcf, gco, newplot, cla, clf, and close.
When a handle's visibility is restricted using callback or off, the object's handle does not appear in its parent's Children property, figures do not appear in the root's CurrentFigure property, objects do not appear in the root's CallbackObject property or in the figure's CurrentObject property, and axes do not appear in their parent's CurrentAxes property.
You can set the root ShowHiddenHandles property to on to make all handles visible regardless of their HandleVisibility settings (this does not affect the values of the HandleVisibility properties).
Handles that are hidden are still valid. If you know an object's handle, you can set and get its properties, and pass it to any function that operates on handles.
{on} | off
This property is not used by light objects.
{on} | off
Callback routine interruption mode. Light object callback routines defined for the DeleteFcn property are not affected by the Interruptible property.
handle of parent axes
Parent of light object. This property contains the handle of the light object's parent. The parent of a light object is the axes object that contains it.
Note that light objects cannot be parented to hggroup or hgtransform objects.
See Objects That Can Contain Other Objects for more information on parenting graphics objects.
[x,y,z] in axes data units
Location of light object. This property specifies a vector defining the location of the light object. The vector is defined from the origin to the specified x-, y-, and z-coordinates. The placement of the light depends on the setting of the Style property:
If the Style property is set to local, Position specifies the actual location of the light (which is then a point source that radiates from the location in all directions).
If the Style property is set to infinite, Position specifies the direction from which the light shines in parallel rays.
on | off
This property is not used by light objects.
{on} | off
This property is not used by light objects.
{infinite} | local
Parallel or divergent light source. This property determines whether MATLAB places the light object at infinity, in which case the light rays are parallel, or at the location specified by the Position property, in which case the light rays diverge in all directions. See the Position property.
string
User-specified object label. The Tag property provides a means to identify graphics objects with a user-specified label. This is particularly useful when you are constructing interactive graphics programs that would otherwise need to define object handles as global variables or pass them as arguments between callback routines. You can define Tag as any string.
string (read only)
Type of graphics object. This property contains a string that identifies the class of graphics object. For light objects, Type is always 'light'.
handle of a uicontextmenu object
This property is not used by light objects.
matrix
User-specified data. This property can be any data you want to associate with the light object. The light does not use this property, but you can access it using set and get.
{on} | off
Light visibility. While light objects themselves are not visible, you can see the light on patch and surface objects. When you set Visible to off, the light emanating from the source is not visible. There must be at least one light object in the axes whose Visible property is on for any lighting features to be enabled (including the axes AmbientLightColor and patch and surface AmbientStrength ).
| light | lightangle | |
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