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NAME
SoVRMLPlaneSensor -
The SoVRMLPlaneSensor class maps pointer motion into object space translations.
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/SoVRMLPlaneSensor>
Inherits SoVRMLDragSensor.
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.
SoVRMLPlaneSensor (void)
Static Public Member Functions
static SoType getClassTypeId (void)
static void initClass (void)
Public Attributes
SoSFVec2f minPosition
SoSFVec2f maxPosition
SoSFVec3f offset
SoSFVec3f translation_changed
Protected Member Functions
virtual const SoFieldData * getFieldData (void) const
virtual SbBool dragStart (void)
virtual void drag (void)
virtual void dragFinish (void)
virtual ~SoVRMLPlaneSensor ()
Static Protected Member Functions
static const SoFieldData ** getFieldDataPtr (void)
Additional Inherited Members
Detailed Description
The SoVRMLPlaneSensor class maps pointer motion into object space translations.
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:
PlaneSensor {
exposedField SFBool autoOffset TRUE
exposedField SFBool enabled TRUE
exposedField SFVec2f maxPosition -1 -1 # (-,)
exposedField SFVec2f minPosition 0 0 # (-,)
exposedField SFVec3f offset 0 0 0 # (-,)
eventOut SFBool isActive
eventOut SFVec3f trackPoint_changed
eventOut SFVec3f translation_changed
}
The PlaneSensor node maps pointing device motion into two-dimensional translation in a
plane parallel to the Z=0 plane of the local coordinate system. The PlaneSensor node uses
the descendent geometry of its parent node to determine whether it is liable to generate
events.
The enabled exposedField enables and disables the PlaneSensor. If enabled is TRUE, the
sensor reacts appropriately to user events. If enabled is FALSE, the sensor does not track
user input or send events.
If enabled receives a FALSE event and isActive is TRUE, the sensor becomes disabled and
deactivated, and outputs an isActive FALSE event.
If enabled receives a TRUE event, the sensor is enabled and made ready for user
activation.
The PlaneSensor node generates events when the pointing device is activated while the
pointer is indicating any descendent geometry nodes of the sensor's parent group. See
4.6.7.5, Activating and manipulating sensors
(http://www.web3d.org/x3d/specifications/vrml/ISO-
IEC-14772-VRML97/part1/concepts.html#4.6.7.5), for details on using the pointing device to
activate the PlaneSensor.
Upon activation of the pointing device (e.g., mouse button down) while indicating the
sensor's geometry, an isActive TRUE event is sent. Pointer motion is mapped into relative
translation in the tracking plane, (a plane parallel to the sensor's local Z=0 plane and
coincident with the initial point of intersection). For each subsequent movement of the
bearing, a translation_changed event is output which corresponds to the sum of the
relative translation from the original intersection point to the intersection point of the
new bearing in the plane plus the offset value. The sign of the translation is defined by
the Z=0 plane of the sensor's coordinate system.
trackPoint_changed events reflect the unclamped drag position on the surface of this
plane. When the pointing device is deactivated and autoOffset is TRUE, offset is set to
the last translation_changed value and an offset_changed event is generated. More details
are provided in 4.6.7.4, Drag sensors (http://www.web3d.org/x3d/specifications/vrml/ISO-
IEC-14772-VRML97/part1/concepts.html#4.6.7.4).
When the sensor generates an isActive TRUE event, it grabs all further motion events from
the pointing device until it is deactivated and generates an isActive FALSE event. Other
pointing-device sensors shall not generate events during this time. Motion of the pointing
device while isActive is TRUE is referred to as a 'drag'.
If a 2D pointing device is in use, isActive events typically reflect the state of the
primary button associated with the device (i.e., isActive is TRUE when the primary button
is pressed, and is FALSE when it is released).
If a 3D pointing device (e.g., wand) is in use, isActive events typically reflect whether
the pointer is within or in contact with the sensor's geometry.
minPosition and maxPosition may be set to clamp translation_changed events to a range of
values as measured from the origin of the Z=0 plane. If the X or Y component of
minPosition is greater than the corresponding component of maxPosition,
translation_changed events are not clamped in that dimension. If the X or Y component of
minPosition is equal to the corresponding component of maxPosition, that component is
constrained to the given value. This technique provides a way to implement a line sensor
that maps dragging motion into a translation in one dimension.
While the pointing device is activated and moved, trackPoint_changed and
translation_changed events are sent. trackPoint_changed events represent the unclamped
intersection points on the surface of the tracking plane. If the pointing device is
dragged off of the tracking plane while activated (e.g., above horizon line), browsers may
interpret this in a variety ways (e.g., clamp all values to the horizon). Each movement of
the pointing device, while isActive is TRUE, generates trackPoint_changed and
translation_changed events. Further information about this behaviour can be found in
4.6.7.3, Pointing-device sensors (http://www.web3d.org/x3d/specifications/vrml/ISO-
IEC-14772-VRML97/part1/concepts.html#4.6.7.3), 4.6.7.4, Drag sensors
(http://www.web3d.org/x3d/specifications/vrml/ISO-
IEC-14772-VRML97/part1/concepts.html#4.6.7.4), and 4.6.7.5, Activating and manipulating
sensors (http://www.web3d.org/x3d/specifications/vrml/ISO-
IEC-14772-VRML97/part1/concepts.html#4.6.7.5).
Constructor & Destructor Documentation
SoVRMLPlaneSensor::SoVRMLPlaneSensor (void)
Constructor.
SoVRMLPlaneSensor::~SoVRMLPlaneSensor () [protected], [virtual]
Destructor.
Member Function Documentation
SoType SoVRMLPlaneSensor::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.
Reimplemented from SoVRMLDragSensor.
const SoFieldData * SoVRMLPlaneSensor::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 SoVRMLDragSensor.
SbBool SoVRMLPlaneSensor::dragStart (void) [protected], [virtual]
This API member is considered internal to the library, as it is not likely to be of
interest to the application programmer.
Called when dragger is selected (picked) by the user.
Implements SoVRMLDragSensor.
void SoVRMLPlaneSensor::drag (void) [protected], [virtual]
This API member is considered internal to the library, as it is not likely to be of
interest to the application programmer.
Called when user drags the mouse after picking the dragger.
Implements SoVRMLDragSensor.
void SoVRMLPlaneSensor::dragFinish (void) [protected], [virtual]
This API member is considered internal to the library, as it is not likely to be of
interest to the application programmer.
Called when mouse button is released after picking and interacting with the dragger.
Implements SoVRMLDragSensor.
Member Data Documentation
SoSFVec2f SoVRMLPlaneSensor::minPosition
The minimum position.
SoSFVec2f SoVRMLPlaneSensor::maxPosition
The maximum position.
SoSFVec3f SoVRMLPlaneSensor::offset
Current position. Initial value is (0, 0).
SoSFVec3f SoVRMLPlaneSensor::translation_changed
An eventOut that is sent during interaction.
Author
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