OSG Path Animation effect

OSG Path Animation effect

Transferred from: http://blog.csdn.net/zhuyingqingfen/article/details/8248157

#include <osg/Group>
#include <osg/ShapeDrawable>

#include <osgViewer/ViewerEventHandlers>
#include <osgViewer/Viewer>

#include <osgDB/ReadFile>
#include <osgUtil/LineSegmentIntersector>
#include <osgGA/GUIEventHandler>
#include <osgGA/AnimationPathManipulator>

#include <iostream>
using namespace Std;

Class Pickeventhandle:p ublic osgga::guieventhandler
{
Public:
Pickeventhandle () {
_points=new Osg::vec3array;
}
Virtual ~pickeventhandle () {
}
Osg::geode*createbox (OSG::VEC3 center) {
OSG::REF_PTR<OSG:: Geode>geode=new Osg::geode;
Geode->getorcreatestateset ()->setmode (Gl_blend, Osg::stateattribute::on);
Osg::ref_ptr<osg::shapedrawable>sd=new osg::shapedrawable (New Osg::box (center,5,5,5));
Sd->setcolor (OSG::VEC4 (1,0,0,1));
Geode->adddrawable (SD);
return Geode.release ();
}
Float GetRuntime (osg::vec3 res,osg::vec3 des) {
Float xx= (res.x ()-des.x ()) * (Res.x ()-des.x ());
Float Yy= (Res.y ()-des.y ()) * (Res.y ()-des.y ());
Float zz= (res.z ()-des.z ()) * (Res.z ()-des.z ());
Float distant=sqrt (XX+YY+ZZ);
return distant*0.1;
}

Osg::animationpath*createpath () {
Osg::ref_ptr<osg::animationpath>anim=new Osg::animationpath;
Anim->setloopmode (Osg::animationpath::loop);

float time=0.0;
float angle=0.0;
Float Roll=1.57;//osg::indegrees (90);

if (_points.valid ()) {
Osg::vec3array::iterator Iter=_points->begin ();
for (;;) {
OSG::VEC3 POS (*iter);
iter++;
if (Iter!=_points->end ()) {
if (Iter->x () > Pos.x ())
{
Angle=1.57-atan ((Iter->y ()-pos.y ())/(Iter->x ()-pos.x ()));
if (angle<0)
angle+=1.57;
}
else {
angle=-(1.57+atan ((Iter->y ()-pos.y ())/(Iter->x ()-pos.x ()));
if (angle>0) {
angle=-(1.57-angle);
}

}

Osg::quat Rotate (Osg::quat (ROLL,OSG::VEC3 (1.0,0,0)) *osg::quat (-ANGLE,OSG::VEC3 (0,0,1)));

Anim->insert (Time,osg::animationpath::controlpoint (pos,rotate));
Time+=getruntime (POS, *iter);
}
else {
Break
}
}
}

Ofstream out ("/root/a.path");//Save the information
Anim->write (out);
Out.close ();
return Anim.release ();
}

BOOL Handle (const Osgga::guieventadapter &ea, Osgga::guiactionadapter &aa)
{

Osgviewer::viewer *viewer=dynamic_cast<osgviewer::viewer*> (&AMP;AA);
if (!viewer)
return false;
Switch (Ea.geteventtype ()) {
Case Osgga::guieventadapter: Finding key points:P ush://
{
Osgutil::linesegmentintersector::intersections inters;
if (Viewer->computeintersections (Ea.getx (), Ea.gety (), inters)) {
Osgutil::linesegmentintersector::intersections::iterator Iter=inters.begin ();
Osg::vec3d Pos=iter->getworldintersectpoint ();
Cout<<pos.x () << "<<pos.y () <<" "<<pos.z () <<endl;
_points->push_back (OSG::VEC3 (Pos.x (), Pos.y (), 3));
Viewer->getscenedata ()->asgroup ()->addchild (Createbox (POS));
}
}
Case osgga::guieventadapter::keydown:{
if (ea.getkey () = = ' F ' | | Ea.getkey () = = ' F ') {//Start roaming (you can save the manipulator here, you can return to the original state after roaming)
if (viewer)
{
Osg::ref_ptr<osgga::animationpathmanipulator>apm=new Osgga::animationpathmanipulator;
Apm->setanimationpath (Createpath ());
Viewer->setcameramanipulator (APM);
}
}
if (ea.getkey () = = ' G ' | | ea.getkey () = = ' G ') {//With the information in the saved file
Osg::ref_ptr<osgga::animationpathmanipulator>apm=new osgga::animationpathmanipulator ("/root/a.path");
Viewer->setcameramanipulator (APM);
}
}
Break
}
return false;

}

Private
Osg::ref_ptr<osg::vec3array> _points;
};

int main (int argc, char *argv[])
{

Osg::ref_ptr<osgviewer::viewer>viewer=new Osgviewer::viewer;
Viewer->setscenedata (Osgdb::readnodefile ("ceep.ive"));
Viewer->addeventhandler (New Pickeventhandle ());
Viewer->addeventhandler (new Osgviewer::screencapturehandler);
Viewer->run ();
}

OSG Path Animation effect