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@c Copyright (C) 2014-2019 Pantxo Diribarne
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Properties of @code{light} objects (@pxref{XREFlight,,light}):

@table @asis

@anchor{XREFlightbeingdeleted}
@prindex light beingdeleted
@item @code{beingdeleted}: @{@qcode{"off"}@} | @qcode{"on"}



@anchor{XREFlightbusyaction}
@prindex light busyaction
@item @code{busyaction}: @qcode{"cancel"} | @{@qcode{"queue"}@}
Define how Octave handles the execution of this object's callback properties when it is unable to interrupt another object's executing callback.  This is only relevant when the currently executing callback object has its @code{interruptible} property set to @qcode{"off"}.  The @code{busyaction} property of the interrupting callback object indicates whether the interrupting callback is queued (@qcode{"queue"} (default)) or discarded (@qcode{"cancel"}).
@xref{Callbacks, , @w{Callbacks section}}.


@anchor{XREFlightbuttondownfcn}
@prindex light buttondownfcn
@item @code{buttondownfcn}: string | function handle, def. @code{[](0x0)}
For information on how to write graphics listener functions see @ref{Callbacks, , @w{Callbacks section}}.


@anchor{XREFlightchildren}
@prindex light children
@item @code{children} (read-only): vector of graphics handles, def. @code{[](0x1)}
@code{children} is unused.


@anchor{XREFlightclipping}
@prindex light clipping
@item @code{clipping}: @qcode{"off"} | @{@qcode{"on"}@}
If @code{clipping} is @qcode{"on"}, the light is clipped in its parent axes limits.


@anchor{XREFlightcolor}
@prindex light color
@item @code{color}: colorspec, def. @code{[1   1   1]}
Color of the light source.  @xref{Colors, ,colorspec}.


@anchor{XREFlightcreatefcn}
@prindex light createfcn
@item @code{createfcn}: string | function handle, def. @code{[](0x0)}
Callback function executed immediately after light has been created.  Function is set by using default property on root object, e.g., @code{set (groot, "defaultlightcreatefcn", 'disp ("light created!")')}.

For information on how to write graphics listener functions see @ref{Callbacks, , @w{Callbacks section}}.


@anchor{XREFlightdeletefcn}
@prindex light deletefcn
@item @code{deletefcn}: string | function handle, def. @code{[](0x0)}
Callback function executed immediately before light is deleted.

For information on how to write graphics listener functions see @ref{Callbacks, , @w{Callbacks section}}.


@anchor{XREFlighthandlevisibility}
@prindex light handlevisibility
@item @code{handlevisibility}: @qcode{"callback"} | @qcode{"off"} | @{@qcode{"on"}@}
If @code{handlevisibility} is @qcode{"off"}, the light's handle is not visible in its parent's "children" property.


@anchor{XREFlighthittest}
@prindex light hittest
@item @code{hittest}: @qcode{"off"} | @{@qcode{"on"}@}
Specify whether light processes mouse events or passes them to ancestors of the object.  When enabled, the object may respond to mouse clicks by evaluating the @qcode{"buttondownfcn"}, showing the uicontextmenu, and eventually becoming the root @qcode{"currentobject"}.  This property is only relevant when the object can accept mouse clicks which is determined by the @qcode{"pickableparts"} property.  @xref{XREFlightpickableparts, , @w{pickableparts property}}.


@anchor{XREFlightinterruptible}
@prindex light interruptible
@item @code{interruptible}: @qcode{"off"} | @{@qcode{"on"}@}
Specify whether this object's callback functions may be interrupted by other callbacks.  By default @code{interruptible} is @qcode{"on"} and callbacks that make use of @code{drawnow}, @code{figure}, @code{waitfor}, @code{getframe} or @code{pause} functions are eventually interrupted.
@xref{Callbacks, , @w{Callbacks section}}.


@anchor{XREFlightparent}
@prindex light parent
@item @code{parent}: graphics handle
Handle of the parent graphics object.


@anchor{XREFlightpickableparts}
@prindex light pickableparts
@item @code{pickableparts}: @qcode{"all"} | @qcode{"none"} | @{@qcode{"visible"}@}
Specify whether light will accept mouse clicks.  By default, @code{pickableparts} is @qcode{"visible"} and only visible parts of the light or its children may react to mouse clicks.  When @code{pickableparts} is @qcode{"all"} both visible and invisible parts (or children) may react to mouse clicks.  When @code{pickableparts} is @qcode{"none"} mouse clicks on the object are ignored and transmitted to any objects underneath this one.  When an object is configured to accept mouse clicks the @qcode{"hittest"} property will determine how they are processed.  @xref{XREFlighthittest, , @w{hittest property}}.


@anchor{XREFlightposition}
@prindex light position
@item @code{position}: def. @code{[1   0   1]}
Position of the light source.


@anchor{XREFlightselected}
@prindex light selected
@item @code{selected}: @{@qcode{"off"}@} | @qcode{"on"}



@anchor{XREFlightselectionhighlight}
@prindex light selectionhighlight
@item @code{selectionhighlight}: @qcode{"off"} | @{@qcode{"on"}@}



@anchor{XREFlightstyle}
@prindex light style
@item @code{style}: @{@qcode{"infinite"}@} | @qcode{"local"}
This string defines whether the light emanates from a light source at infinite distance (@qcode{"infinite"}) or from a local point source (@qcode{"local"}).


@anchor{XREFlighttag}
@prindex light tag
@item @code{tag}: string, def. @qcode{""}
A user-defined string to label the graphics object.


@anchor{XREFlighttype}
@prindex light type
@item @code{type} (read-only): string
Class name of the graphics object.  @code{type} is always @qcode{"light"}


@anchor{XREFlightuicontextmenu}
@prindex light uicontextmenu
@item @code{uicontextmenu}: graphics handle, def. @code{[](0x0)}
Graphics handle of the uicontextmenu object that is currently associated to this light object.


@anchor{XREFlightuserdata}
@prindex light userdata
@item @code{userdata}: Any Octave data, def. @code{[](0x0)}
User-defined data to associate with the graphics object.


@anchor{XREFlightvisible}
@prindex light visible
@item @code{visible}: @qcode{"off"} | @{@qcode{"on"}@}
If @code{visible} is @qcode{"off"}, the light is not rendered on screen.

@end table