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/*
*
* Copyright (C) 2000 Silicon Graphics, Inc. All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/NoticeExplan/
*
*/
/*
* Copyright (C) 1990,91 Silicon Graphics, Inc.
*
_______________________________________________________________________
______________ S I L I C O N G R A P H I C S I N C . ____________
|
| $Revision: 1.1.1.1 $
|
| Classes:
| SoTranslate2Dragger
|
| Author(s): Paul Isaacs
|
______________ S I L I C O N G R A P H I C S I N C . ____________
_______________________________________________________________________
*/
#include <stdio.h>
#include <Inventor/SbLinear.h>
#include <Inventor/SoDB.h>
#include <Inventor/sensors/SoFieldSensor.h>
#include <Inventor/SoInput.h>
#include <Inventor/SoPath.h>
#include <Inventor/projectors/SbPlaneProjector.h>
#include <Inventor/draggers/SoTranslate2Dragger.h>
#include <Inventor/nodes/SoSeparator.h>
#include <Inventor/nodes/SoSwitch.h>
#include <Inventor/events/SoEvent.h>
#include <Inventor/events/SoKeyboardEvent.h>
#include <Inventor/actions/SoHandleEventAction.h>
#include "geom/SoTranslate2DraggerGeom.h"
SO_KIT_SOURCE(SoTranslate2Dragger);
////////////////////////////////////////////////////////////////////////
//
// Description:
// Constructor
//
SoTranslate2Dragger::SoTranslate2Dragger()
//
////////////////////////////////////////////////////////////////////////
{
SO_KIT_CONSTRUCTOR(SoTranslate2Dragger);
isBuiltIn = TRUE;
// Put this stuff under the geomSeparator so it will draw more
// efficiently.
SO_KIT_ADD_CATALOG_ENTRY(translatorSwitch, SoSwitch, TRUE,
geomSeparator, ,FALSE);
SO_KIT_ADD_CATALOG_ENTRY(translator, SoSeparator, TRUE,
translatorSwitch, ,TRUE);
SO_KIT_ADD_CATALOG_ENTRY(translatorActive, SoSeparator, TRUE,
translatorSwitch, ,TRUE);
SO_KIT_ADD_CATALOG_ENTRY(feedbackSwitch, SoSwitch, TRUE,
geomSeparator, ,FALSE);
SO_KIT_ADD_CATALOG_ENTRY(feedback, SoSeparator, TRUE,
feedbackSwitch, ,TRUE);
SO_KIT_ADD_CATALOG_ENTRY(feedbackActive, SoSeparator, TRUE,
feedbackSwitch, ,TRUE);
SO_KIT_ADD_CATALOG_ENTRY(axisFeedbackSwitch, SoSwitch, TRUE,
geomSeparator, ,FALSE);
SO_KIT_ADD_CATALOG_ENTRY(xAxisFeedback, SoSeparator, TRUE,
axisFeedbackSwitch, ,TRUE);
SO_KIT_ADD_CATALOG_ENTRY(yAxisFeedback, SoSeparator, TRUE,
axisFeedbackSwitch, ,TRUE);
// read geometry for shared parts
if (SO_KIT_IS_FIRST_INSTANCE())
readDefaultParts("translate2Dragger.iv", geomBuffer, sizeof(geomBuffer) );
SO_KIT_ADD_FIELD(translation, (0.0, 0.0, 0.0));
SO_KIT_INIT_INSTANCE();
// create the parts...
setPartAsDefault("translator", "translate2Translator");
setPartAsDefault("translatorActive","translate2TranslatorActive");
setPartAsDefault("feedback", "translate2Feedback");
setPartAsDefault("feedbackActive", "translate2FeedbackActive");
setPartAsDefault("xAxisFeedback", "translate2XAxisFeedback");
setPartAsDefault("yAxisFeedback", "translate2YAxisFeedback");
// Set the switches to 0...
setSwitchValue( translatorSwitch.getValue(), 0 );
setSwitchValue( feedbackSwitch.getValue(), 0 );
// Set the axis feedback switch to SO_SWITCH_NONE
// They're only displayed while dragging
setSwitchValue( axisFeedbackSwitch.getValue(), SO_SWITCH_NONE );
// Create the line projector
planeProj = new SbPlaneProjector();
// add the callbacks to perform the dragging
addStartCallback( &SoTranslate2Dragger::startCB );
addMotionCallback( &SoTranslate2Dragger::motionCB );
addFinishCallback( &SoTranslate2Dragger::finishCB );
// add callback to respond to the shift key, for constraining motion
// to a line within the plane.
addOtherEventCallback( &SoTranslate2Dragger::metaKeyChangeCB );
// Updates the translation field when the motionMatrix is set.
addValueChangedCallback( &SoTranslate2Dragger::valueChangedCB );
// Updates the motionMatrix when the translation field is set.
fieldSensor = new SoFieldSensor( &SoTranslate2Dragger::fieldSensorCB, this);
fieldSensor->setPriority( 0 );
setUpConnections( TRUE, TRUE );
}
////////////////////////////////////////////////////////////////////////
//
// Description:
// Destructor
//
SoTranslate2Dragger::~SoTranslate2Dragger()
//
////////////////////////////////////////////////////////////////////////
{
delete planeProj;
if (fieldSensor)
delete fieldSensor;
}
// detach/attach any sensors, callbacks, and/or field connections.
// Called by: start/end of SoBaseKit::readInstance
// and on new copy by: start/end of SoBaseKit::copy.
// Classes that redefine must call setUpConnections(TRUE,TRUE)
// at end of constructor.
// Returns the state of the node when this was called.
SbBool
SoTranslate2Dragger::setUpConnections( SbBool onOff, SbBool doItAlways )
{
if ( !doItAlways && connectionsSetUp == onOff)
return onOff;
if ( onOff ) {
// We connect AFTER base class.
SoDragger::setUpConnections( onOff, FALSE );
// Call the sensor CBs to make things are up-to-date.
fieldSensorCB( this, NULL );
// Connect the field sensors
if (fieldSensor->getAttachedField() != &translation)
fieldSensor->attach( &translation );
}
else {
// We disconnect BEFORE base class.
// Disconnect the field sensors.
if (fieldSensor->getAttachedField())
fieldSensor->detach();
SoDragger::setUpConnections( onOff, FALSE );
}
return !(connectionsSetUp = onOff);
}
////////////////////////////////////////////////////////////////////////
//
// Description:
// Set up the highlighting, projector, and the initial hit on
// the dragger
//
// Use: private
//
void
SoTranslate2Dragger::dragStart()
//
////////////////////////////////////////////////////////////////////////
{
// Set the switches to 1...
setSwitchValue( translatorSwitch.getValue(), 1 );
setSwitchValue( feedbackSwitch.getValue(), 1 );
// Set the axis feedback switch to display both.
// They're displayed while dragging
setSwitchValue( axisFeedbackSwitch.getValue(), SO_SWITCH_ALL );
// There is no constrained direction...
translateDir = -1;
// Make a note of which modifier keys are down.
shftDown = getEvent()->wasShiftDown();
// This is the point we'll use if a metaKey callback makes us re-start.
worldRestartPt = getWorldStartingPoint();
// Establish the projector plane in working space.
// Working space is space at end of motion matrix.
// Plane normal is defined relative to the translatorPart, so
// use z-axis to construct the projector plane.
SbVec3f startLocalHitPt = getLocalStartingPoint();
planeProj->setPlane( SbPlane(SbVec3f(0,0,1), startLocalHitPt ) );
}
////////////////////////////////////////////////////////////////////////
//
// Description:
// Stretch the dragger according to the motion along the plane
// projector
//
// Use: private
//
void
SoTranslate2Dragger::drag()
//
////////////////////////////////////////////////////////////////////////
{
// Set up the projector space and view.
// Working space is space at end of motion matrix.
planeProj->setViewVolume( getViewVolume() );
planeProj->setWorkingSpace( getLocalToWorldMatrix() );
// Get newHitPt and startHitPt in workspace.
SbVec3f newHitPt = planeProj->project( getNormalizedLocaterPosition());
SbVec3f startHitPt = getLocalStartingPoint();
// Convert newHitPt to world space and save this as our new worldRestartPt
getLocalToWorldMatrix().multVecMatrix( newHitPt, worldRestartPt );
// Figure out the translation relative to start position.
SbVec3f motion = newHitPt - startHitPt;
// Maybe we need to constrain the motion...
if ( !shftDown )
translateDir = -1;
else {
// The shift key is pressed. This means 1-D translation.
if ( translateDir == -1 ) {
// The 1-D direction is not defined. Calculate it based on which
// direction got the maximum locater motion.
if ( isAdequateConstraintMotion() ) {
if ( fabs( motion[0]) > fabs( motion[1]))
translateDir = 0;
else
translateDir = 1;
// Set the axis feedback switch to the given direction.
setSwitchValue( axisFeedbackSwitch.getValue(), translateDir );
}
else {
// Not ready to pick a direction yet. Don't move.
return;
}
}
// get the projection of 'motion' onto the preferred axis.
SbVec3f constrainedMotion(0,0,0);
constrainedMotion[translateDir] = motion[translateDir];
motion = constrainedMotion;
}
// Append this to the startMotionMatrix, which we saved at the beginning
// of the drag, to find the current motion matrix.
setMotionMatrix( appendTranslation( getStartMotionMatrix(), motion ) );
}
////////////////////////////////////////////////////////////////////////
//
// Description:
//
// Use: private
//
void
SoTranslate2Dragger::dragFinish()
//
////////////////////////////////////////////////////////////////////////
{
// Set the switches to 0...
setSwitchValue( translatorSwitch.getValue(), 0 );
setSwitchValue( feedbackSwitch.getValue(), 0 );
// Set the axis feedback switch to SO_SWITCH_NONE
// They're only displayed while dragging
setSwitchValue( axisFeedbackSwitch.getValue(), SO_SWITCH_NONE );
}
//
////////////////////////////////////////////////////////////////////////
// keypress/release callback functions
//
// These assure that the proper changes to the highlights,
// currentState, and projectors are made
//
////////////////////////////////////////////////////////////////////////
//
void
SoTranslate2Dragger::metaKeyChangeCB( void *, SoDragger *inDragger)
{
SoTranslate2Dragger *d = (SoTranslate2Dragger *) inDragger;
SoHandleEventAction *ha = d->getHandleEventAction();
// [1] Only do this if we are grabbing
if (ha->getGrabber() != d )
return;
// [2] We only want key press or release events.
const SoEvent *event = d->getEvent();
if ( !SO_KEY_PRESS_EVENT(event, ANY) && !SO_KEY_RELEASE_EVENT(event, ANY))
return;
// [3] Is the key the shift key?
const SoKeyboardEvent *ke = (const SoKeyboardEvent *) event;
SoKeyboardEvent::Key key = ke->getKey();
if ( key == SoKeyboardEvent::LEFT_SHIFT ||
key == SoKeyboardEvent::RIGHT_SHIFT ) {
// We want to end the old gesture and start a new one.
// [A] Release the grabber. This ends the gesture and calls all
// finishCallbacks (on parent dragger, too, if we're registered)
ha->releaseGrabber();
// [B] Set the starting point to be our saved worldRestartPoint
d->setStartingPoint( d->worldRestartPt );
// [C] Become the grabber again. This begins a new gesture and calls all
// startCallbacks (parent dragger, too). Info like viewVolume,
// viewportRegion, handleEventAction, and
// tempPathToThis is still valid.
ha->setGrabber(d);
// [D] set handled
ha->setHandled();
}
}
////////////////////////////////////////////////////////////////////
// Stubs for callbacks
////////////////////////////////////////////////////////////////////
void
SoTranslate2Dragger::startCB( void *, SoDragger *inDragger )
{
SoTranslate2Dragger *m = (SoTranslate2Dragger *) inDragger;
m->dragStart();
}
void
SoTranslate2Dragger::motionCB( void *, SoDragger *inDragger )
{
SoTranslate2Dragger *m = (SoTranslate2Dragger *) inDragger;
m->drag();
}
void
SoTranslate2Dragger::finishCB( void *, SoDragger *inDragger )
{
SoTranslate2Dragger *m = (SoTranslate2Dragger *) inDragger;
m->dragFinish();
}
void
SoTranslate2Dragger::valueChangedCB( void *, SoDragger *inDragger )
{
SoTranslate2Dragger *m = (SoTranslate2Dragger *) inDragger;
SbMatrix motMat = m->getMotionMatrix();
SbVec3f trans, scale;
SbRotation rot, scaleOrient;
getTransformFast( motMat, trans, rot, scale, scaleOrient );
// Disconnect the field sensor
m->fieldSensor->detach();
if ( m->translation.getValue() != trans )
m->translation = trans;
// Reconnect the field sensor
m->fieldSensor->attach( &(m->translation) );
}
void
SoTranslate2Dragger::fieldSensorCB( void *inDragger, SoSensor *)
{
SoTranslate2Dragger *dragger = (SoTranslate2Dragger *) inDragger;
// Incorporate the new field value into the matrix...
SbMatrix motMat = dragger->getMotionMatrix();
dragger->workFieldsIntoTransform( motMat );
dragger->setMotionMatrix( motMat );
}
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