Ubuntu Manpage: SoSpotLightManip — spotlight node with 3D interface for editing location, direction, and beam width

Provided by: inventor-doc_2.1.5-10+dfsg-2.1build2_all

NAME

       SoSpotLightManip — spotlight node with 3D interface for editing location, direction, and beam width

INHERITS FROM

       SoBase > SoFieldContainer > SoNode > SoLight > SoSpotLight > SoSpotLightManip

SYNOPSIS

       #include <Inventor/manips/SoSpotLightManip.h>

          Fields from class SoSpotLight:

     SoSFVec3f           location
     SoSFVec3f           direction
     SoSFFloat           dropOffRate
     SoSFFloat           cutOffAngle

          Fields from class SoLight:

     SoSFBool            on
     SoSFFloat           intensity
     SoSFColor           color

          Methods from class SoSpotLightManip:

                         SoSpotLightManip()
     SoDragger *         getDragger()
     SbBool              replaceNode(SoPath *p )
     SbBool              replaceManip(SoPath *p, SoSpotLight *newOne ) const
     static SoType       getClassTypeId()

          Methods from class SoNode:

     void                setOverride(SbBool state)
     SbBool              isOverride() const
     SoNode *            copy(SbBool copyConnections = FALSE) const
     virtual SbBool      affectsState() const
     static SoNode *     getByName(const SbName &name)
     static int          getByName(const SbName &name, SoNodeList &list)

          Methods from class SoFieldContainer:

     void                setToDefaults()
     SbBool              hasDefaultValues() const
     SbBool              fieldsAreEqual(const SoFieldContainer *fc) const
     void                copyFieldValues(const SoFieldContainer *fc, SbBool copyConnections = FALSE)
     SbBool              set(const char *fieldDataString)
     void                get(SbString &fieldDataString)
     virtual int         getFields(SoFieldList &resultList) const
     virtual SoField *   getField(const SbName &fieldName) const
     SbBool              getFieldName(const SoField *field, SbName &fieldName) const
     SbBool              isNotifyEnabled() const
     SbBool              enableNotify(SbBool flag)

          Methods from class SoBase:

     void                ref()
     void                unref() const
     void                unrefNoDelete() const
     void                touch()
     virtual SoType      getTypeId() const
     SbBool              isOfType(SoType type) const
     virtual void        setName(const SbName &name)
     virtual SbName      getName() const

DESCRIPTION

SoSpotLightManip is the base class for all SoSpotLight nodes that have a built-in 3D user interface (this
is the only such class provided with the Inventor toolkit). Since it is derived from SoSpotLight, any
changes to its fields result in a change of lighting for nodes that follow it in the scene graph. In this
case, the interface edits the location, direction, and cutOffAngle fields. Also, the color of the
manipulator's geometry will reflect the color of the light (but you can not edit the color using this
manipulator).

Typically, you will want to replace a regular SoSpotLight with an SoSpotLightManip (as when the user
selects a light to be edited), or vice versa (as when the user is done moving the light and the interface
should go away). Use the replaceNode() method to insert a manipulator into a scene graph, and the
replaceManip() method to remove it when done.

The SoSpotLightManip utilizes an SoSpotLightDragger to provide a 3D interface. However, the manipulator
differs from the dragger; it lights other objects in the scene because, as an SoSpotLight, it alters the
state. The fields values and movement of the dragger, on the other hand, affect only the dragger itself.
To find out more about how the interface works and what each part will do, see the reference page for
SoSpotLightDragger. The interfaces of the dragger and the manipulator are identical.

The SoSpotLightManip utilizes its dragger by adding it as a hidden child. When an action is applied to
the manipulator, such as rendering or handling events, the manipulator first traverses the dragger, and
then the manipulator adds its lighting parameters to the state. When you click-drag-release over the
manipulator, it passes these events down to the dragger, which moves as a result ("I can't help it, I'm a
dragger!").

The manipulator maintains consistency between the fields of the dragger and its own fields. Let's say you
use the mouse to widen the cone of the dragger. Callbacks insure that the cutOffAngle field of the
manipulator will change by the same amount, thus changing the lighting of nodes which follow in the scene
graph. Similarly, if you set the cutOffAngle field of the SoSpotLightManip, the manipulator will widen
the beam of the dragger accordingly.

Because the dragger is a hidden child, you can see the dragger on screen and interact with it, but the
dragger does not show up when you write the manipulator to file. Also, any SoPath will end at the
manipulator. (See the Actions section of this reference page for a complete description of when the
dragger is traversed).

If you want to get a pointer to the dragger you can get it from the manipulator using the getDragger()
method. You will need to do this if you want to change the geometry of a manipulator, since the geometry
actually belongs to the dragger.

METHODS

SoSpotLightManip()
Constructor.

SoDragger * getDragger()
Returns a pointer to the dragger being used by this manipulator. Given this pointer, you can customize
the dragger just like you would any other dragger. You can change geometry using the setPart() method,
or add callbacks using the methods found in the SoDragger reference page.

SbBool replaceNode(SoPath *p )
Replaces the tail of the path with this manipulator. The tail of the path must be an SoSpotLight node
(or subclass thereof). If the path has a nodekit, this will try to use setPart() to insert the
manipulator. Otherwise, the manipulator requires that the next to last node in the path chain be a
group.

The field values from the spotlight node will be copied to this manipulator, and the light node will
be replaced.

The manipulator will not call ref() on the node it is replacing. The old node will disappear if it has
no references other than from the input path p and its parent, since this manipulator will be
replacing it in both of those places. Nor will the manipulator make any changes to field connections
of the old node. The calling process is thus responsible for keeping track of its own nodes and field
connections.

SbBool replaceManip(SoPath *p, SoSpotLight *newOne ) const
Replaces the tail of the path, which must be this manipulator, with the given SoSpotLight node. If the
path has a nodekit, this will try to use setPart() to insert the new node. Otherwise, the manipulator
requires that the next to last node in the path chain be a group.

The field values from the manipulator will be copied to the spotlight node, and the manipulator will
be replaced.

The manipulator will not call ref() or unref() on the node which is replacing it, nor will it make
any changes to field connections. The calling process is thus responsible for keeping track of its own
nodes and field connections.

static SoType getClassTypeId()
Returns type identifier for this class.

ACTION BEHAVIOR

       SoGLRenderAction,  SoCallbackAction,  SoGetBoundingBoxAction,   SoGetMatrixAction,   SoHandleEventAction,
       SoRayPickAction
          First,  traverses  the  dragger  the way an SoGroup would. All draggers place themselves in space, but
          leave the current transformation unchanged when finished. Then the SoSpotLightManip adds  a  spotlight
          to the state, just like its base class, SoSpotLight.

     SoSearchAction
          Searches just like an SoSpotLight. Does not search the dragger, which is a hidden child.

     SoWriteAction
          Writes  out  just  like  an  SoSpotLight.  Does not write the dragger, which is a hidden child. If you
          really need to write valuable information about the dragger, such  as  customized  geometry,  you  can
          retrieve the dragger with the getDragger() method and then write it out separately.

FILE FORMAT/DEFAULTS

       SpotLightManip {
          on           TRUE
          intensity    1
          color        1 1 1
          location     0 0 1
          direction    0 0 -1
          dropOffRate  0
          cutOffAngle  0.785398
     }