Files
create/src/Gui/MouseSelection.cpp

950 lines
27 KiB
C++

/***************************************************************************
* Copyright (c) 2005 Werner Mayer <wmayer[at]users.sourceforge.net> *
* *
* This file is part of the FreeCAD CAx development system. *
* *
* This library is free software; you can redistribute it and/or *
* modify it under the terms of the GNU Library General Public *
* License as published by the Free Software Foundation; either *
* version 2 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 Library General Public License for more details. *
* *
* You should have received a copy of the GNU Library General Public *
* License along with this library; see the file COPYING.LIB. If not, *
* write to the Free Software Foundation, Inc., 59 Temple Place, *
* Suite 330, Boston, MA 02111-1307, USA *
* *
***************************************************************************/
#include "PreCompiled.h"
#ifndef _PreComp_
# include <qapplication.h>
# include <qevent.h>
# include <qpainter.h>
# include <qpixmap.h>
# include <QGLFramebufferObject>
# include <QMenu>
# include <Inventor/SbBox.h>
# include <Inventor/events/SoEvent.h>
# include <Inventor/events/SoKeyboardEvent.h>
# include <Inventor/events/SoLocation2Event.h>
# include <Inventor/events/SoMouseButtonEvent.h>
#endif
#include <Base/Console.h>
#include "MouseSelection.h"
#include "View3DInventor.h"
#include "View3DInventorViewer.h"
#include "GLPainter.h"
using namespace Gui;
AbstractMouseSelection::AbstractMouseSelection() : _pcView3D(0)
{
m_bInner = true;
mustRedraw = false;
}
void AbstractMouseSelection::grabMouseModel( Gui::View3DInventorViewer* viewer )
{
_pcView3D = viewer;
m_cPrevCursor = _pcView3D->getWidget()->cursor();
m_antiAliasing = (int)_pcView3D->getAntiAliasingMode();
_pcView3D->setAntiAliasingMode(View3DInventorViewer::None);
// do initialization of your mousemodel
initialize();
}
void AbstractMouseSelection::releaseMouseModel()
{
if (_pcView3D) {
// do termination of your mousemodel
terminate();
_pcView3D->getWidget()->setCursor(m_cPrevCursor);
_pcView3D->setAntiAliasingMode(View3DInventorViewer::AntiAliasing(m_antiAliasing));
_pcView3D = 0;
}
}
void AbstractMouseSelection::redraw()
{
// Note: For any reason it does not work to do a redraw in the actualRedraw() method of the
// viewer class. So, we do the redraw when the user continues moving the cursor. E.g. have
// a look to PolyPickerSelection::draw()
mustRedraw = true;
}
int AbstractMouseSelection::handleEvent(const SoEvent * const ev, const SbViewportRegion& vp)
{
int ret=Continue;
const SbVec2s& sz = vp.getWindowSize();
short w,h; sz.getValue(w,h);
SbVec2s loc = ev->getPosition();
short x,y; loc.getValue(x,y);
y = h-y; // the origin is at the left bottom corner (instead of left top corner)
if (ev->getTypeId().isDerivedFrom(SoMouseButtonEvent::getClassTypeId())) {
const SoMouseButtonEvent * const event = (const SoMouseButtonEvent *) ev;
const SbBool press = event->getState() == SoButtonEvent::DOWN ? TRUE : FALSE;
if (press) {
_clPoly.push_back(ev->getPosition());
ret = mouseButtonEvent(static_cast<const SoMouseButtonEvent*>(ev), QPoint(x,y));
}
else {
ret = mouseButtonEvent(static_cast<const SoMouseButtonEvent*>(ev), QPoint(x,y));
}
}
else if (ev->getTypeId().isDerivedFrom(SoLocation2Event::getClassTypeId())) {
ret = locationEvent(static_cast<const SoLocation2Event*>(ev), QPoint(x,y));
}
else if (ev->getTypeId().isDerivedFrom(SoKeyboardEvent::getClassTypeId())) {
ret = keyboardEvent(static_cast<const SoKeyboardEvent*>(ev));
}
if (ret == Restart)
_clPoly.clear();
return ret;
}
// -----------------------------------------------------------------------------------
BaseMouseSelection::BaseMouseSelection()
: AbstractMouseSelection()
{
}
// -----------------------------------------------------------------------------------
#if 0
/* XPM */
static const char *cursor_polypick[]={
"32 32 2 1",
"# c #646464",
". c None",
"................................",
"................................",
".......#........................",
".......#........................",
".......#........................",
"................................",
".......#........................",
"..###.###.###...................",
".......#...............#........",
"......................##........",
".......#..............#.#.......",
".......#.............#..#.......",
".......#............#...#.......",
"....................#....#......",
"...................#.....#......",
"..................#......#......",
"............#.....#.......#.....",
"...........#.##..#........#.....",
"..........#....##.........#.....",
".........#...............#......",
"........#................#......",
".......#................#.......",
"......#.................#.......",
".....#.................#........",
"....#####..............#........",
".........#########....#.........",
"..................#####.........",
"................................",
"................................",
"................................",
"................................",
"................................"};
/* XPM */
static const char *cursor_scissors[]={
"32 32 3 1",
"# c #000000",
"+ c #ffffff",
". c None",
"....+...........................",
"....+...........................",
"....+...........................",
"................................",
"+++.+.+++.......................",
"................................",
"....+...........................",
"....+...................#####...",
"....+.................########..",
".....................#########..",
".....###............##########..",
"....##++##.........#####...###..",
"...#++++++##.......####...####..",
"...##+++++++#......####.######..",
".....#+++++++##....##########...",
"......##+++++++##.##########....",
"........##+++++++#########......",
"..........#+++++++#####.........",
"...........##+++++####..........",
"...........##+++++###...........",
".........##+++++++########......",
"........##+++++++###########....",
"......##+++++++##.###########...",
"....##+++++++##....##########...",
"...#+++++++##......####..#####..",
"...#++++++#........#####..####..",
"....##++##..........#####..###..",
"......#.............##########..",
".....................#########..",
".......................######...",
"................................",
"................................"};
#endif
static const char *cursor_cut_scissors[]={
"32 32 6 1",
"a c #800000",
"c c #808080",
"+ c #c0c0c0",
"b c #ff0000",
"# c #ffffff",
". c None",
"....#...........................",
"....#...........................",
"....#...........................",
"................................",
"###.#.###.......................",
"................................",
"....#...........................",
"....#...................aaaaa...",
"....#.................aabbbbba..",
".....................abbbbbbba..",
".....ccc............abbaaaaabb..",
"....cc++cc.........babaa...aba..",
"...c+#++++cc.......abba...abba..",
"...cc+#+++++c......abba.aabbaa..",
".....c+++++#+cc....abbaaabbaa...",
"......cc+#+++#+cc.aabbbbbbaa....",
"........cc+#+++#+cabbbaaaa......",
"..........c+++++++abbaa.........",
"...........cc+++#+aaaa..........",
"...........cc+#+++caa...........",
".........cc+++++#+cbbaaaaa......",
"........cc+#+++#+cabbabbbaaa....",
"......cc+#+++#+cc.aaabbbbbbaa...",
"....cc+#+++#+cc....abbaaaabba...",
"...c++#++#+cc......abba..aabba..",
"...c+###++c........aabaa..aaba..",
"....cc++cc..........abbaa..aba..",
"......c.............aabbaaaaba..",
".....................baabbbbba..",
".......................aaaaaa...",
"................................",
"................................"};
PolyPickerSelection::PolyPickerSelection()
{
m_iRadius = 2;
m_iNodes = 0;
m_bWorking = false;
}
void PolyPickerSelection::initialize()
{
QPixmap p(cursor_cut_scissors);
QCursor cursor(p, 4, 4);
_pcView3D->getWidget()->setCursor(cursor);
}
void PolyPickerSelection::terminate()
{
// _pcView3D->getGLWidget()->releaseMouse();
}
void PolyPickerSelection::draw ()
{
if (mustRedraw){
if (_cNodeVector.size() > 1) {
QPoint start = _cNodeVector.front();
GLPainter p;
p.begin(_pcView3D);
p.setColor(1.0f,1.0f,1.0f);
p.setLogicOp(GL_XOR);
for (std::vector<QPoint>::iterator it = _cNodeVector.begin()+1; it != _cNodeVector.end(); ++it) {
p.drawLine(start.x(),start.y(),it->x(), it->y());
start = *it;
}
p.end();
}
// recursive call, but no infinite loop
mustRedraw = false;
draw();
}
if (m_bWorking) {
if (m_iNodes < int(_cNodeVector.size())) {
m_iNodes = int(_cNodeVector.size());
if (_cNodeVector.size() > 2) {
QPoint start = _cNodeVector.front();
GLPainter p;
p.begin(_pcView3D);
p.setColor(1.0f,1.0f,1.0f);
p.setLogicOp(GL_XOR);
p.drawLine(m_iXnew,m_iYnew,start.x(), start.y());
p.end();
}
}
else {
GLPainter p;
p.begin(_pcView3D);
p.setColor(1.0f,1.0f,1.0f);
p.setLogicOp(GL_XOR);
p.drawLine(m_iXnew,m_iYnew,m_iXold,m_iYold);
if (_cNodeVector.size() > 1) {
QPoint start = _cNodeVector.front();
p.drawLine(m_iXnew,m_iYnew,start.x(), start.y());
}
p.end();
}
}
}
PolyPickerSelection::~PolyPickerSelection()
{
}
int PolyPickerSelection::popupMenu()
{
QMenu menu;
QAction* fi = menu.addAction(QObject::tr("Finish"));
menu.addAction(QObject::tr("Clear"));
QAction* ca = menu.addAction(QObject::tr("Cancel"));
if (getPositions().size() < 3)
fi->setEnabled(false);
QAction* id = menu.exec(QCursor::pos());
if (id == fi)
return Finish;
else if (id == ca)
return Cancel;
else
return Restart;
}
int PolyPickerSelection::mouseButtonEvent( const SoMouseButtonEvent * const e, const QPoint& pos )
{
const int button = e->getButton();
const SbBool press = e->getState() == SoButtonEvent::DOWN ? TRUE : FALSE;
if (press) {
switch (button)
{
case SoMouseButtonEvent::BUTTON1:
{
// start working from now on
if (!m_bWorking) {
m_bWorking = true;
// clear the old polygon
_cNodeVector.clear();
_pcView3D->getGLWidget()->update();
// _pcView3D->getGLWidget()->grabMouse();
}
_cNodeVector.push_back(pos);
m_iXnew = pos.x(); m_iYnew = pos.y();
m_iXold = pos.x(); m_iYold = pos.y();
} break;
case SoMouseButtonEvent::BUTTON2:
{
if (_cNodeVector.size() > 0) {
if (_cNodeVector.back() != pos)
_cNodeVector.push_back(pos);
m_iXnew = pos.x(); m_iYnew = pos.y();
m_iXold = pos.x(); m_iYold = pos.y();
}
} break;
default:
{
} break;
}
}
// release
else {
switch (button)
{
case SoMouseButtonEvent::BUTTON2:
{
QCursor cur = _pcView3D->getWidget()->cursor();
_pcView3D->getWidget()->setCursor(m_cPrevCursor);
// The pop-up menu should be shown when releasing mouse button because
// otherwise the navigation style doesn't get the UP event and gets into
// an inconsistent state.
int id = popupMenu();
if (id == Finish || id == Cancel) {
releaseMouseModel();
}
else if (id == Restart) {
m_bWorking = false;
m_iNodes = 0;
_pcView3D->getWidget()->setCursor(cur);
}
return id;
} break;
default:
{
} break;
}
}
return Continue;
}
int PolyPickerSelection::locationEvent( const SoLocation2Event * const e, const QPoint& pos )
{
// do all the drawing stuff for us
QPoint clPoint = pos;
if (m_bWorking) {
// check the position
QRect r = _pcView3D->getGLWidget()->rect();
if (!r.contains(clPoint)) {
if (clPoint.x() < r.left())
clPoint.setX( r.left());
if (clPoint.x() > r.right())
clPoint.setX(r.right());
if (clPoint.y() < r.top())
clPoint.setY(r.top());
if (clPoint.y() > r.bottom())
clPoint.setY(r.bottom());
#ifdef FC_OS_WINDOWS
QPoint newPos = _pcView3D->getGLWidget()->mapToGlobal(clPoint);
QCursor::setPos(newPos);
#endif
}
}
draw();
m_iXnew = clPoint.x();
m_iYnew = clPoint.y();
draw();
return Continue;
}
int PolyPickerSelection::keyboardEvent( const SoKeyboardEvent * const e )
{
return Continue;
}
// -----------------------------------------------------------------------------------
PolyClipSelection::PolyClipSelection()
{
}
PolyClipSelection::~PolyClipSelection()
{
}
int PolyClipSelection::popupMenu()
{
QMenu menu;
QAction* ci = menu.addAction(QObject::tr("Inner"));
QAction* co = menu.addAction(QObject::tr("Outer"));
QAction* ca = menu.addAction(QObject::tr("Cancel"));
if (getPositions().size() < 3) {
ci->setEnabled(false);
co->setEnabled(false);
}
QAction* id = menu.exec(QCursor::pos());
if (id == ci) {
m_bInner = true;
return Finish;
}
else if (id == co) {
m_bInner = false;
return Finish;
}
else if (id == ca)
return Cancel;
else
return Restart;
}
// -----------------------------------------------------------------------------------
BrushSelection::BrushSelection()
: r(1.0f), g(0.0f), b(0.0f), a(0.0f), l(2.0f)
{
m_iNodes = 0;
m_bWorking = false;
m_bClose = false;
}
void BrushSelection::initialize()
{
QPixmap p(cursor_cut_scissors);
QCursor cursor(p, 4, 4);
_pcView3D->getWidget()->setCursor(cursor);
}
void BrushSelection::terminate()
{
}
void BrushSelection::setColor(float r, float g, float b, float a)
{
this->r = r;
this->g = g;
this->b = b;
this->a = a;
}
void BrushSelection::setLineWidth(float l)
{
this->l = l;
}
void BrushSelection::setClosed(bool on)
{
this->m_bClose = on;
}
void BrushSelection::draw ()
{
if (mustRedraw){
if (_cNodeVector.size() > 1) {
QPoint start = _cNodeVector.front();
GLPainter p;
p.begin(_pcView3D);
p.setLineWidth(this->l);
p.setColor(this->r, this->g, this->b, this->a);
for (std::vector<QPoint>::iterator it = _cNodeVector.begin()+1; it != _cNodeVector.end(); ++it) {
p.drawLine(start.x(),start.y(),it->x(), it->y());
start = *it;
}
p.end();
}
// recursive call, but no infinite loop
mustRedraw = false;
draw();
}
if (m_bWorking) {
GLPainter p;
p.begin(_pcView3D);
p.setLineWidth(this->l);
p.setColor(this->r, this->g, this->b, this->a);
if (m_bClose && !_cNodeVector.empty()) {
// We have to redraw the whole polyline when using XOR because otherwise the curve looks 'dirty'.
QPoint start = _cNodeVector.front();
for (std::vector<QPoint>::iterator it = _cNodeVector.begin()+1; it != _cNodeVector.end(); ++it) {
p.drawLine(start.x(),start.y(),it->x(), it->y());
start = *it;
}
start = _cNodeVector.front();
p.setLineStipple(2, 0x3F3F);
p.setLogicOp(GL_XOR);
p.drawLine(m_iXold, m_iYold, start.x(),start.y());
p.drawLine(m_iXnew, m_iYnew, start.x(),start.y());
p.resetLogicOp();
p.resetLineStipple();
}
p.drawLine(m_iXnew, m_iYnew, m_iXold, m_iYold);
p.end();
}
}
BrushSelection::~BrushSelection()
{
}
int BrushSelection::popupMenu()
{
QMenu menu;
QAction* fi = menu.addAction(QObject::tr("Finish"));
menu.addAction(QObject::tr("Clear"));
QAction* ca = menu.addAction(QObject::tr("Cancel"));
if (getPositions().size() < 3)
fi->setEnabled(false);
QAction* id = menu.exec(QCursor::pos());
if (id == fi)
return Finish;
else if (id == ca)
return Cancel;
else
return Restart;
}
int BrushSelection::mouseButtonEvent(const SoMouseButtonEvent * const e, const QPoint& pos)
{
const int button = e->getButton();
const SbBool press = e->getState() == SoButtonEvent::DOWN ? TRUE : FALSE;
if (press) {
switch (button)
{
case SoMouseButtonEvent::BUTTON1:
{
// start working from now on
if (!m_bWorking) {
m_bWorking = true;
// clear the old polygon
_cNodeVector.clear();
_pcView3D->getGLWidget()->update();
_cNodeVector.push_back(pos);
m_iXnew = pos.x(); m_iYnew = pos.y();
m_iXold = pos.x(); m_iYold = pos.y();
}
} break;
case SoMouseButtonEvent::BUTTON2:
{
if (_cNodeVector.size() > 0) {
if (_cNodeVector.back() != pos)
_cNodeVector.push_back(pos);
m_iXnew = pos.x(); m_iYnew = pos.y();
m_iXold = pos.x(); m_iYold = pos.y();
}
} break;
default:
{
} break;
}
}
// release
else {
switch (button)
{
case SoMouseButtonEvent::BUTTON1:
return Finish;
case SoMouseButtonEvent::BUTTON2:
{
QCursor cur = _pcView3D->getWidget()->cursor();
_pcView3D->getWidget()->setCursor(m_cPrevCursor);
// The pop-up menu should be shown when releasing mouse button because
// otherwise the navigation style doesn't get the UP event and gets into
// an inconsistent state.
int id = popupMenu();
if (id == Finish || id == Cancel) {
releaseMouseModel();
}
else if (id == Restart) {
m_bWorking = false;
m_iNodes = 0;
_pcView3D->getWidget()->setCursor(cur);
}
return id;
} break;
default:
{
} break;
}
}
return Continue;
}
int BrushSelection::locationEvent(const SoLocation2Event * const e, const QPoint& pos)
{
// do all the drawing stuff for us
QPoint clPoint = pos;
if (m_bWorking) {
// check the position
QRect r = _pcView3D->getGLWidget()->rect();
if (!r.contains(clPoint)) {
if (clPoint.x() < r.left())
clPoint.setX( r.left());
if (clPoint.x() > r.right())
clPoint.setX(r.right());
if (clPoint.y() < r.top())
clPoint.setY(r.top());
if (clPoint.y() > r.bottom())
clPoint.setY(r.bottom());
}
SbVec2s last = _clPoly.back();
SbVec2s curr = e->getPosition();
if (abs(last[0]-curr[0]) > 20 || abs(last[1]-curr[1]) > 20)
_clPoly.push_back(curr);
_cNodeVector.push_back(clPoint);
}
m_iXnew = clPoint.x();
m_iYnew = clPoint.y();
draw();
m_iXold = clPoint.x();
m_iYold = clPoint.y();
return Continue;
}
int BrushSelection::keyboardEvent( const SoKeyboardEvent * const e )
{
return Continue;
}
// -----------------------------------------------------------------------------------
RectangleSelection::RectangleSelection()
{
m_bWorking = false;
}
RectangleSelection::~RectangleSelection()
{
}
void RectangleSelection::initialize()
{
}
void RectangleSelection::terminate()
{
}
void RectangleSelection::draw ()
{
if (m_bWorking) {
GLPainter p;
p.begin(_pcView3D);
p.setColor(1.0, 1.0, 0.0, 0.0);
p.setLogicOp(GL_XOR);
p.setLineWidth(3.0f);
p.setLineStipple(2, 0x3F3F);
p.drawRect(m_iXold, m_iYold, m_iXnew, m_iYnew);
p.end();
}
}
int RectangleSelection::mouseButtonEvent( const SoMouseButtonEvent * const e, const QPoint& pos )
{
const int button = e->getButton();
const SbBool press = e->getState() == SoButtonEvent::DOWN ? TRUE : FALSE;
int ret = Continue;
if (press) {
switch ( button )
{
case SoMouseButtonEvent::BUTTON1:
{
m_bWorking = true;
m_iXold = m_iXnew = pos.x();
m_iYold = m_iYnew = pos.y();
} break;
default:
{
} break;
}
}
else {
switch (button) {
case SoMouseButtonEvent::BUTTON1:
{
releaseMouseModel();
m_bWorking = false;
_clPoly.push_back(e->getPosition());
ret = Finish;
} break;
default:
{
} break;
}
}
return ret;
}
int RectangleSelection::locationEvent( const SoLocation2Event * const e, const QPoint& pos )
{
draw();
m_iXnew = pos.x();
m_iYnew = pos.y();
draw();
return Continue;
}
int RectangleSelection::keyboardEvent( const SoKeyboardEvent * const e )
{
return Continue;
}
// -----------------------------------------------------------------------------------
class RubberbandSelection::Private : public Gui::GLGraphicsItem
{
Gui::View3DInventorViewer* viewer;
int x_old, y_old, x_new, y_new;
bool working;
public:
Private(Gui::View3DInventorViewer* v) : viewer(v)
{
x_old = y_old = x_new = y_new = 0;
working = false;
}
~Private()
{
}
void setWorking(bool on)
{
working = on;
}
void setCoords(int x1, int y1, int x2, int y2)
{
x_old = x1;
y_old = y1;
x_new = x2;
y_new = y2;
}
void paintGL()
{
if (!working)
return;
const SbViewportRegion vp = viewer->getViewportRegion();
SbVec2s size = vp.getViewportSizePixels();
glMatrixMode(GL_PROJECTION);
glOrtho(0, size[0], size[1], 0, 0, 100);
glMatrixMode(GL_MODELVIEW);
glDisable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glLineWidth(4.0);
glColor4f(1.0f, 1.0f, 1.0f, 0.2f);
glRecti(x_old, y_old, x_new, y_new);
glColor4f(1.0, 1.0, 0.0, 0.5);
glLineStipple(3, 0xAAAA);
glEnable(GL_LINE_STIPPLE);
glBegin(GL_LINE_LOOP);
glVertex2i(x_old, y_old);
glVertex2i(x_new, y_old);
glVertex2i(x_new, y_new);
glVertex2i(x_old, y_new);
glEnd();
glLineWidth(1.0);
glDisable(GL_LINE_STIPPLE);
glDisable(GL_BLEND);
}
};
RubberbandSelection::RubberbandSelection()
{
d = 0;
}
RubberbandSelection::~RubberbandSelection()
{
}
void RubberbandSelection::initialize()
{
d = new Private(_pcView3D);
_pcView3D->addGraphicsItem(d);
if (QGLFramebufferObject::hasOpenGLFramebufferObjects()) {
_pcView3D->setRenderFramebuffer(true);
}
_pcView3D->scheduleRedraw();
}
void RubberbandSelection::terminate()
{
_pcView3D->removeGraphicsItem(d);
delete d; d = 0;
if (QGLFramebufferObject::hasOpenGLFramebufferObjects()) {
_pcView3D->setRenderFramebuffer(false);
}
_pcView3D->scheduleRedraw();
}
void RubberbandSelection::draw ()
{
}
int RubberbandSelection::mouseButtonEvent(const SoMouseButtonEvent * const e, const QPoint& pos)
{
const int button = e->getButton();
const SbBool press = e->getState() == SoButtonEvent::DOWN ? TRUE : FALSE;
int ret = Continue;
if (press) {
switch (button)
{
case SoMouseButtonEvent::BUTTON1:
{
d->setWorking(true);
m_iXold = m_iXnew = pos.x();
m_iYold = m_iYnew = pos.y();
} break;
default:
{
} break;
}
}
else {
switch (button) {
case SoMouseButtonEvent::BUTTON1:
{
d->setWorking(false);
releaseMouseModel();
_clPoly.push_back(e->getPosition());
ret = Finish;
} break;
default:
{
} break;
}
}
return ret;
}
int RubberbandSelection::locationEvent(const SoLocation2Event * const e, const QPoint& pos)
{
m_iXnew = pos.x();
m_iYnew = pos.y();
d->setCoords(m_iXold, m_iYold, m_iXnew, m_iYnew);
_pcView3D->render();
return Continue;
}
int RubberbandSelection::keyboardEvent(const SoKeyboardEvent * const e)
{
return Continue;
}
// -----------------------------------------------------------------------------------
BoxZoomSelection::BoxZoomSelection()
{
}
BoxZoomSelection::~BoxZoomSelection()
{
}
void BoxZoomSelection::terminate()
{
RubberbandSelection::terminate();
int xmin = std::min<int>(m_iXold, m_iXnew);
int xmax = std::max<int>(m_iXold, m_iXnew);
int ymin = std::min<int>(m_iYold, m_iYnew);
int ymax = std::max<int>(m_iYold, m_iYnew);
SbBox2s box(xmin, ymin, xmax, ymax);
_pcView3D->boxZoom(box);
}