1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/**************************************************************************\
*
* This file is part of the Coin 3D visualization library.
* Copyright (C) by Kongsberg Oil & Gas Technologies.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* ("GPL") version 2 as published by the Free Software Foundation.
* See the file LICENSE.GPL at the root directory of this source
* distribution for additional information about the GNU GPL.
*
* For using Coin with software that can not be combined with the GNU
* GPL, and for taking advantage of the additional benefits of our
* support services, please contact Kongsberg Oil & Gas Technologies
* about acquiring a Coin Professional Edition License.
*
* See http://www.coin3d.org/ for more information.
*
* Kongsberg Oil & Gas Technologies, Bygdoy Alle 5, 0257 Oslo, NORWAY.
* http://www.sim.no/ sales@sim.no coin-support@coin3d.org
*
\**************************************************************************/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif // HAVE_CONFIG_H
#ifdef HAVE_VRML97
/*!
\class SoVRMLSphereSensor SoVRMLSphereSensor.h Inventor/VRMLnodes/SoVRMLSphereSensor
\brief The SoVRMLSphereSensor class maps pointer motion into rotations on a sphere.
\ingroup VRMLnodes
\WEB3DCOPYRIGHT
\verbatim
SphereSensor {
exposedField SFBool autoOffset TRUE
exposedField SFBool enabled TRUE
exposedField SFRotation offset 0 1 0 0 # [-1,1],(-,)
eventOut SFBool isActive
eventOut SFRotation rotation_changed
eventOut SFVec3f trackPoint_changed
}
\endverbatim
The SphereSensor node maps pointing device motion into spherical rotation
about the origin of the local coordinate system. The SphereSensor node uses
the descendent geometry of its parent node to determine whether it is liable
to generate events.
The \e enabled exposed field enables and disables the SphereSensor
node. If \e enabled is TRUE, the sensor reacts appropriately to user
events. If \e enabled is FALSE, the sensor does not track user input
or send events. If \e enabled receives a FALSE event and \e isActive
is TRUE, the sensor becomes disabled and deactivated, and outputs an \e isActive
FALSE event. If \e enabled receives a TRUE event the sensor is enabled
and ready for user activation.
The SphereSensor 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 SphereSensor.
Upon activation of the pointing device (e.g., mouse button down)
over the sensor's geometry, an \e isActive TRUE event is sent. The
vector defined by the initial point of intersection on the
SphereSensor's geometry and the local origin determines the radius
of the sphere that is used to map subsequent pointing device motion
while dragging. The virtual sphere defined by this radius and the
local origin at the time of activation is used to interpret
subsequent pointing device motion and is not affected by any changes
to the sensor's coordinate system while the sensor is active.
For each position of the bearing, a rotation_changed event is sent
which corresponds to the sum of the relative rotation from the
original intersection point plus the offset
value. trackPoint_changed events reflect the unclamped drag position
on the surface of this sphere. When the pointing device is
deactivated and autoOffset is TRUE, offset is set to the last
rotation_changed value and an offset_changed event is generated. See
4.6.7.4, Drag sensors
(<http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-VRML97/part1/concepts.html#4.6.7.4>),
for more details.
When the sensor generates an \e 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
shall 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 will typically 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 (e.g., wand) is in use, isActive
events will typically reflect whether the pointer is within (or in
contact with) the sensor's geometry.
While the pointing device is activated, trackPoint_changed and
rotation_changed events are output. trackPoint_changed events
represent the unclamped intersection points on the surface of the
invisible sphere. If the pointing device is dragged off the sphere
while activated, browsers may interpret this in a variety of ways
(e.g., clamp all values to the sphere or continue to rotate as the
point is dragged away from the sphere).
Each movement of the pointing device while \e isActive is TRUE
generates \e trackPoint_changed and \e rotation_changed events. Further
information about this behaviour can be found in 4.6.7.3
(<http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-VRML97/part1/concepts.html#4.6.7.3>),
Pointing-device sensors, 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>).
*/
/*!
\var SoSFRotation SoVRMLSphereSensor::offset
The sensor rotation value.
*/
/*!
\var SoSFRotation SoVRMLSphereSensor::rotation_changed
An eventOut that is updated during interaction. Holds the differense
between the current rotation and the sensor rotation value.
*/
#include <Inventor/VRMLnodes/SoVRMLSphereSensor.h>
#include <Inventor/VRMLnodes/SoVRMLMacros.h>
#include <Inventor/projectors/SbSpherePlaneProjector.h>
#include "nodes/SoSubNodeP.h"
SO_NODE_SOURCE(SoVRMLSphereSensor);
// Doc in parent
void
SoVRMLSphereSensor::initClass(void)
{
SO_NODE_INTERNAL_INIT_CLASS(SoVRMLSphereSensor, SO_VRML97_NODE_TYPE);
}
/*!
Constructor.
*/
SoVRMLSphereSensor::SoVRMLSphereSensor(void)
{
SO_VRMLNODE_INTERNAL_CONSTRUCTOR(SoVRMLSphereSensor);
SO_VRMLNODE_ADD_EXPOSED_FIELD(offset, (0.0f, 1.0f, 0.0f, 0.0f));
SO_VRMLNODE_ADD_EVENT_OUT(rotation_changed);
this->sphereproj = new SbSpherePlaneProjector;
}
/*!
Destructor.
*/
SoVRMLSphereSensor::~SoVRMLSphereSensor()
{
delete this->sphereproj;
}
// Doc in parent
SbBool
SoVRMLSphereSensor::dragStart(void)
{
SbVec3f thehitpt = this->getLocalStartingPoint();
float radius = thehitpt.length();
if (radius == 0.0f) return FALSE;
this->sphereproj->setSphere(SbSphere(SbVec3f(0.0f, 0.0f, 0.0f), radius));
this->sphereproj->setViewVolume(this->getViewVolume());
this->sphereproj->setWorkingSpace(this->getLocalToWorldMatrix());
this->getLocalToWorldMatrix().multVecMatrix(thehitpt, this->prevworldhitpt);
this->prevrotation = SbRotation::identity();
this->rotation_changed = this->offset.getValue();
return TRUE;
}
// Doc in parent
void
SoVRMLSphereSensor::drag(void)
{
this->sphereproj->setViewVolume(this->getViewVolume());
this->sphereproj->setWorkingSpace(this->getLocalToWorldMatrix());
SbVec3f startpt;
this->getWorldToLocalMatrix().multVecMatrix(this->prevworldhitpt, startpt);
SbVec3f projpt = this->sphereproj->project(this->getNormalizedLocaterPosition());
this->getLocalToWorldMatrix().multVecMatrix(projpt, this->prevworldhitpt);
SbRotation rot = this->sphereproj->getRotation(startpt, projpt);
this->prevrotation *= rot;
this->rotation_changed = this->prevrotation * this->offset.getValue();
}
// Doc in parent
void
SoVRMLSphereSensor::dragFinish(void)
{
if (this->autoOffset.getValue()) {
this->offset = this->rotation_changed.getValue();
}
}
#endif // HAVE_VRML97
|