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NAME
SoVRMLProximitySensor -
The SoVRMLProximitySensor class is used to generate events when the viewer enters or exits
a region.
The detailed class documentation is taken verbatim from the VRML97 standard (ISO/IEC
14772-1:1997). It is copyright The Web3D Consortium, and is used by permission of the
Consortium:
SYNOPSIS
#include <Inventor/VRMLnodes/SoVRMLProximitySensor.h>
Inherits SoNode.
Public Member Functions
virtual SoType getTypeId (void) const
Returns the type identification of an object derived from a class inheriting SoBase.
This is used for run-time type checking and 'downward' casting.
SoVRMLProximitySensor (void)
virtual SbBool affectsState (void) const
virtual void doAction (SoAction *action)
virtual void GLRender (SoGLRenderAction *action)
virtual void callback (SoCallbackAction *action)
virtual void rayPick (SoRayPickAction *action)
virtual void getBoundingBox (SoGetBoundingBoxAction *action)
Static Public Member Functions
static SoType getClassTypeId (void)
static void initClass (void)
Public Attributes
SoSFVec3f center
SoSFVec3f size
SoSFBool enabled
SoSFBool isActive
SoSFVec3f position_changed
SoSFRotation orientation_changed
SoSFTime enterTime
SoSFTime exitTime
Protected Member Functions
virtual const SoFieldData * getFieldData (void) const
virtual ~SoVRMLProximitySensor ()
virtual void notify (SoNotList *list)
Static Protected Member Functions
static const SoFieldData ** getFieldDataPtr (void)
Additional Inherited Members
Detailed Description
The SoVRMLProximitySensor class is used to generate events when the viewer enters or exits
a region.
The detailed class documentation is taken verbatim from the VRML97 standard (ISO/IEC
14772-1:1997). It is copyright The Web3D Consortium, and is used by permission of the
Consortium:
ProximitySensor {
exposedField SFVec3f center 0 0 0 # (-,)
exposedField SFVec3f size 0 0 0 # [0,)
exposedField SFBool enabled TRUE
eventOut SFBool isActive
eventOut SFVec3f position_changed
eventOut SFRotation orientation_changed
eventOut SFTime enterTime
eventOut SFTime exitTime
}
The ProximitySensor node generates events when the viewer enters, exits, and moves within
a region in space (defined by a box).
A proximity sensor is enabled or disabled by sending it an enabled event with a value of
TRUE or FALSE. A disabled sensor does not send events.
A ProximitySensor node generates isActive TRUE/FALSE events as the viewer enters and exits
the rectangular box defined by its center and size fields. Browsers shall interpolate
viewer positions and timestamp the isActive events with the exact time the viewer first
intersected the proximity region.
The center field defines the centre point of the proximity region in object space. The
size field specifies a vector which defines the width (x), height (y), and depth (z) of
the box bounding the region. The components of the size field shall be greater than or
equal to zero. ProximitySensor nodes are affected by the hierarchical transformations of
their parents.
The enterTime event is generated whenever the isActive TRUE event is generated (user
enters the box), and exitTime events are generated whenever an isActive FALSE event is
generated (user exits the box).
The position_changed and orientation_changed eventOuts send events whenever the user is
contained within the proximity region and the position and orientation of the viewer
changes with respect to the ProximitySensor node's coordinate system including enter and
exit times.
The viewer movement may be a result of a variety of circumstances resulting from browser
navigation, ProximitySensor node's coordinate system changes, or bound Viewpoint node's
position or orientation changes.
Each ProximitySensor node behaves independently of all other ProximitySensor nodes. Every
enabled ProximitySensor node that is affected by the viewer's movement receives and sends
events, possibly resulting in multiple
ProximitySensor nodes receiving and sending events simultaneously. Unlike TouchSensor
nodes, there is no notion of a ProximitySensor node lower in the scene graph 'grabbing'
events.
Instanced (DEF/USE) ProximitySensor nodes use the union of all the boxes to check for
enter and exit. A multiply instanced ProximitySensor node will detect enter and exit for
all instances of the box and send enter/exit events appropriately. However, the results
are undefined if the any of the boxes of a multiply instanced ProximitySensor node
overlap.
A ProximitySensor node that surrounds the entire world has an enterTime equal to the time
that the world was entered and can be used to start up animations or behaviours as soon as
a world is loaded.
A ProximitySensor node with a box containing zero volume (i.e., any size field element of
0.0) cannot generate events. This is equivalent to setting the enabled field to FALSE.
A ProximitySensor read from a VRML file shall generate isActive TRUE, position_changed,
orientation_changed and enterTime events if the sensor is enabled and the viewer is inside
the proximity region.
A ProximitySensor inserted into the transformation hierarchy shall generate isActive TRUE,
position_changed, orientation_changed and enterTime events if the sensor is enabled and
the viewer is inside the proximity region.
A ProximitySensor removed from the transformation hierarchy shall generate isActive FALSE,
position_changed, orientation_changed and exitTime events if the sensor is enabled and the
viewer is inside the proximity region.
Constructor & Destructor Documentation
SoVRMLProximitySensor::SoVRMLProximitySensor (void)
Constructor.
SoVRMLProximitySensor::~SoVRMLProximitySensor () [protected], [virtual]
Destructor.
Member Function Documentation
SoType SoVRMLProximitySensor::getTypeId (void) const [virtual]
Returns the type identification of an object derived from a class inheriting SoBase. This
is used for run-time type checking and 'downward' casting. Usage example:
void foo(SoNode * node)
{
if (node->getTypeId() == SoFile::getClassTypeId()) {
SoFile * filenode = (SoFile *)node; // safe downward cast, knows the type
}
}
For application programmers wanting to extend the library with new nodes, engines,
nodekits, draggers or others: this method needs to be overridden in all subclasses. This
is typically done as part of setting up the full type system for extension classes, which
is usually accomplished by using the pre-defined macros available through for instance
Inventor/nodes/SoSubNode.h (SO_NODE_INIT_CLASS and SO_NODE_CONSTRUCTOR for node classes),
Inventor/engines/SoSubEngine.h (for engine classes) and so on.
For more information on writing Coin extensions, see the class documentation of the
toplevel superclasses for the various class groups.
Implements SoBase.
const SoFieldData * SoVRMLProximitySensor::getFieldData (void) const [protected], [virtual]
Returns a pointer to the class-wide field data storage object for this instance. If no
fields are present, returns NULL.
Reimplemented from SoFieldContainer.
SbBool SoVRMLProximitySensor::affectsState (void) const [virtual]
Returns TRUE if the node could have any effect on the state during traversal.
If it returns FALSE, no data in the traversal-state will change from the pre-traversal
state to the post-traversal state. The SoSeparator node will for instance return FALSE, as
it pushes and pops the state before and after traversal of its children. All SoShape nodes
will also return FALSE, as just pushing out geometry data to the rendering engine won't
affect the actual rendering state.
The default method returns TRUE, on a 'better safe than sorry' philosophy.
Reimplemented from SoNode.
void SoVRMLProximitySensor::doAction (SoAction *action) [virtual]
This function performs the typical operation of a node for any action.
Reimplemented from SoNode.
void SoVRMLProximitySensor::GLRender (SoGLRenderAction *action) [virtual]
Action method for the SoGLRenderAction.
This is called during rendering traversals. Nodes influencing the rendering state in any
way or who wants to throw geometry primitives at OpenGL overrides this method.
Reimplemented from SoNode.
void SoVRMLProximitySensor::callback (SoCallbackAction *action) [virtual]
Action method for SoCallbackAction.
Simply updates the state according to how the node behaves for the render action, so the
application programmer can use the SoCallbackAction for extracting information about the
scene graph.
Reimplemented from SoNode.
void SoVRMLProximitySensor::rayPick (SoRayPickAction *action) [virtual]
Action method for SoRayPickAction.
Checks the ray specification of the action and tests for intersection with the data of the
node.
Nodes influencing relevant state variables for how picking is done also overrides this
method.
Reimplemented from SoNode.
void SoVRMLProximitySensor::getBoundingBox (SoGetBoundingBoxAction *action) [virtual]
Action method for the SoGetBoundingBoxAction.
Calculates bounding box and center coordinates for node and modifies the values of the
action to encompass the bounding box for this node and to shift the center point for the
scene more towards the one for this node.
Nodes influencing how geometry nodes calculates their bounding box also overrides this
method to change the relevant state variables.
Reimplemented from SoNode.
void SoVRMLProximitySensor::notify (SoNotList *l) [protected], [virtual]
Notifies all auditors for this instance when changes are made.
Reimplemented from SoNode.
Member Data Documentation
SoSFVec3f SoVRMLProximitySensor::center
The center of the region. Default value is (0,0,0).
SoSFVec3f SoVRMLProximitySensor::size
The region size. Default value is (0, 0, 0).
SoSFBool SoVRMLProximitySensor::enabled
Enable/disable sensor. Default value is TRUE.
SoSFBool SoVRMLProximitySensor::isActive
An eventOut that is sent every time the sensor changes state.
SoSFVec3f SoVRMLProximitySensor::position_changed
An eventOut that is sent when the viewer is inside the region and the viewer position or
orientation is changed.
SoSFRotation SoVRMLProximitySensor::orientation_changed
An eventOut that is sent when the viewer is inside the region and the viewer position or
orientation is changed.
SoSFTime SoVRMLProximitySensor::enterTime
An eventOut that is sent when the viewer enters the region.
SoSFTime SoVRMLProximitySensor::exitTime
An eventOut that is sent when the viewer exits the region.
Author
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