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NAME
SoVRMLTouchSensor -
The SoVRMLTouchSensor class tracks to pointer position and sends events based on user
interaction.
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/SoVRMLTouchSensor.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.
SoVRMLTouchSensor (void)
virtual SbBool affectsState (void) const
virtual void handleEvent (SoHandleEventAction *action)
Static Public Member Functions
static SoType getClassTypeId (void)
static void initClass (void)
Public Attributes
SoSFBool enabled
SoSFVec3f hitNormal_changed
SoSFVec3f hitPoint_changed
SoSFVec2f hitTexCoord_changed
SoSFBool isActive
SoSFBool isOver
SoSFTime touchTime
Protected Member Functions
virtual const SoFieldData * getFieldData (void) const
virtual ~SoVRMLTouchSensor ()
virtual void notify (SoNotList *list)
Static Protected Member Functions
static const SoFieldData ** getFieldDataPtr (void)
Additional Inherited Members
Detailed Description
The SoVRMLTouchSensor class tracks to pointer position and sends events based on user
interaction.
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:
TouchSensor {
exposedField SFBool enabled TRUE
eventOut SFVec3f hitNormal_changed
eventOut SFVec3f hitPoint_changed
eventOut SFVec2f hitTexCoord_changed
eventOut SFBool isActive
eventOut SFBool isOver
eventOut SFTime touchTime
}
A TouchSensor node tracks the location and state of the pointing device and detects when
the user points at geometry contained by the TouchSensor node's parent group. A
TouchSensor node can be enabled or disabled by sending it an enabled event with a value of
TRUE or FALSE. If the TouchSensor node is disabled, it does not track user input or send
events.
The TouchSensor generates events when the pointing device points toward any geometry nodes
that are descendants of the TouchSensor'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 more details on using the pointing
device to activate the TouchSensor.
The isOver eventOut reflects the state of the pointing device with regard to whether it is
pointing towards the TouchSensor node's geometry or not. When the pointing device changes
state from a position such that its bearing does not intersect any of the TouchSensor
node's geometry to one in which it does intersect geometry, an isOver TRUE event is
generated. When the pointing device moves from a position such that its bearing intersects
geometry to one in which it no longer intersects the geometry, or some other geometry is
obstructing the TouchSensor node's geometry, an isOver FALSE event is generated. These
events are generated only when the pointing device has moved and changed `over' state.
Events are not generated if the geometry itself is animating and moving underneath the
pointing device.
As the user moves the bearing over the TouchSensor node's geometry, the point of
intersection (if any) between the bearing and the geometry is determined. Each movement of
the pointing device, while isOver is TRUE, generates hitPoint_changed, hitNormal_changed
and hitTexCoord_changed events. hitPoint_changed events contain the 3D point on the
surface of the underlying geometry, given in the TouchSensor node's coordinate system.
hitNormal_changed events contain the surface normal vector at the hitPoint.
hitTexCoord_changed events contain the texture coordinates of that surface at the
hitPoint. The values of hitTexCoord_changed and hitNormal_changed events are computed as
appropriate for the associated shape.
If isOver is TRUE, the user may activate the pointing device to cause the TouchSensor node
to generate isActive events (e.g., by pressing the primary mouse button). When the
TouchSensor node generates an isActive TRUE event, it grabs all further motion events from
the pointing device until it is released and generates an isActive FALSE event (other
pointing-device sensors will not generate events during this time). Motion of the pointing
device while isActive is TRUE is termed a 'drag.' If a 2D pointing device is in use,
isActive events reflect the state of the primary button associated with the device (i.e.,
isActive is TRUE when the primary button is pressed and FALSE when it is released). If a
3D pointing device is in use, isActive events will typically reflect whether the pointing
device is within (or in contact with) the TouchSensor node's geometry.
The eventOut field touchTime is generated when all three of the following conditions are
true:
• The pointing device was pointing towards the geometry when it was initially activated
(isActive is TRUE).
• The pointing device is currently pointing towards the geometry (isOver is TRUE).
• The pointing device is deactivated (isActive FALSE event is also generated).
More information about this behaviour is described 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).
The rest of this class documentation is not from the VRML97 standards documentation, but
was written specifically for the Coin3D API documentation.
Here is a small example which demonstrates use of the SoVRMLTouchSensor. Click on the
SoVRMLSphere to turn the SoVRMLPointLight on:
#VRML V2.0 utf8
Group {
children [
Transform {
children [
DEF light PointLight {
intensity 1
on FALSE
}
Transform {
translation -2 0 -2
children [
Shape {
appearance Appearance {
material Material {
diffuseColor 1 0 1
specularColor 1 1 1
shininess 0.9
}
}
geometry Sphere { }
}
DEF touchsensor TouchSensor { }
]
}
]
}
]
ROUTE touchsensor.isActive TO light.set_on
}
Constructor & Destructor Documentation
SoVRMLTouchSensor::SoVRMLTouchSensor (void)
Constructor.
SoVRMLTouchSensor::~SoVRMLTouchSensor () [protected], [virtual]
Destructor.
Member Function Documentation
SoType SoVRMLTouchSensor::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 * SoVRMLTouchSensor::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 SoVRMLTouchSensor::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 SoVRMLTouchSensor::handleEvent (SoHandleEventAction *action) [virtual]
Action method for SoHandleEventAction.
Inspects the event data from action, and processes it if it is something which this node
should react to.
Nodes influencing relevant state variables for how event handling is done also overrides
this method.
Reimplemented from SoNode.
void SoVRMLTouchSensor::notify (SoNotList *l) [protected], [virtual]
Notifies all auditors for this instance when changes are made.
Reimplemented from SoNode.
Member Data Documentation
SoSFBool SoVRMLTouchSensor::enabled
TRUE is enabled. Default value is TRUE.
SoSFVec3f SoVRMLTouchSensor::hitNormal_changed
An eventOut that is sent when the pointer is over some child geometry. Contains the object
space normal.
SoSFVec3f SoVRMLTouchSensor::hitPoint_changed
An eventOut that is sent when the pointer is over some child geometry. Contains the object
space point.
SoSFVec2f SoVRMLTouchSensor::hitTexCoord_changed
An eventOut that is sent when the pointer is over some child geometry. Contains the object
space texture coordinates.
SoSFBool SoVRMLTouchSensor::isActive
An event out that is sent when the active state changes. The sensor goes active when the
user clicks on some child, and is inactive again when the mouse button is release.
SoSFBool SoVRMLTouchSensor::isOver
An event out that is sent when the pointer is moved onto or away from a child object.
SoSFTime SoVRMLTouchSensor::touchTime
An event out that is generated when the sensor is active and is currently pointing on some
child geometry.
Author
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