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Light Properties | See Also |
BusyAction
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, subsequently invoked callback routes 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.
ButtonDownFcn
stringThis property is not useful on Lights.
Children
handlesThe empty matrix; Light objects have no children.
Clipping
on | off
Clipping
has no effect on Light objects.
Color
ColorSpec
Color of Light. This property defines the color of the light emanating from the Light object. Define it as three-element RGB vector or one of MATLAB's predefined names. See the ColorSpec
reference page for more information.
CreateFcn
stringCallback routine executed during object creation. This property defines a callback routine that executes when MATLAB creates a Light object. You must define this property as a default value for Lights. For example, the statement,
set(0,'DefaultLightCreateFcn','set(gcf,''Colormap'',hsv)')sets the current Figure colormap to
hsv
whenever you create a Light object. MATLAB executes this routine after setting all Light properties. Setting this property on an existing Light object has no effect.
The handle of the object whose CreateFcn is being executed is accessible only through the Root CallbackObject property, which you can query using gcbo
.
DeleteFcn
string
Delete Light callback routine. A callback routine that executes when you delete the Light object (i.e., when you issue a delete
command or clear the Axes or Figure containing the Light). MATLAB executes the routine before destroying the object's properties so these values are available to the callback routine.
gcbo
.
HandleVisibility
{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).
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 provide 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 evaling 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.
HitTest
{on} | off
This property is not used by Light objects.
Interruptible
{on} | off
Callback routine interruption mode. Light object callback routines defined for the DeleteFcn
property are not affected by the Interruptible
property.
Parent
handle of parent Axes Light objects parent. The handle of the Light object's parent Axes. You can move a Light object to another Axes by changing this property to the new Axes handle.
Position
[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:
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).
Style
property is set to infinite
, Position
specifies the direction from which the light shines in parallel rays.
Selected
on | off
This property is not used by Light objects.
SelectionHighlight
{on} | off
This property is not used by Light objects.
Style
{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.
Tag
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 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.
Type
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
'.
UIContextMenu
handle of a uicontextmenu objectThis property is not used by Light objects.
UserData
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
.
Visible
{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
).
lighting
, material
, patch
, surface