转自：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 :public 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");//把信息保存
anim->write(out);
out.close();
return anim.release();
}
bool handle(const osgGA::GUIEventAdapter &ea ,osgGA::GUIActionAdapter &aa)
{
osgViewer::Viewer *viewer=dynamic_cast<osgViewer::Viewer*>(&aa);
if(!viewer)
return false;
switch (ea.getEventType()){
case osgGA::GUIEventAdapter::PUSH://寻找关键点
{
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‘){//启动漫游(可以在这保存下操纵器，漫游完毕可以返回原来状态
if(viewer)
{
osg::ref_ptr<osgGA::AnimationPathManipulator>apm=new osgGA::AnimationPathManipulator;
apm->setAnimationPath(createPath());
viewer->setCameraManipulator(apm);
}
}
if(ea.getKey()==‘g‘ || ea.getKey()==‘G‘){//用已经保存的文件里的信息
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();
}
