OsgDraggerHandler.cpp

#include "StdAfx.h"

#include "OsgMovableItem.h"
#include "OsgBody.h"
#include "OsgRigidBody.h"
#include "OsgJoint.h"
#include "OsgMouseSpring.h"
#include "OsgDraggerHandler.h"
#include "OsgStructure.h"
#include "OsgUserData.h"
#include "OsgDragger.h"
#include "OsgSimulator.h"

namespace OsgAnimatSim
{
        namespace Visualization
        {

OsgDraggerHandler::OsgDraggerHandler(Simulator *lpSim, osgViewer::Viewer *osgViewer, osg::Viewport *osgViewport)
{
        m_lpSim = lpSim;
        m_osgViewer = osgViewer;
        m_osgViewport = osgViewport;
        m_osgActiveDragger = NULL;
}

OsgDraggerHandler::~OsgDraggerHandler(void)
{
}


bool OsgDraggerHandler::handle(const GUIEventAdapter& ea, GUIActionAdapter& aa)
{
        bool bHandled = false;

        try
        {
                float x = ea.getX();
                float y = ea.getY();

                //Take an action based on the event type
                switch(ea.getEventType())
                {
                        case(GUIEventAdapter::PUSH):
                        {
                                pick(ea, aa);
                                break;
                        }

                        case(GUIEventAdapter::RELEASE):
                        {
                                if(m_osgActiveDragger)
                                {
                    m_osgManipInfo._hitIter = m_osgManipInfo._hitList.begin();
                                        m_osgManipInfo.setCamera((osg::Camera *) m_osgViewer->getCamera());
                    m_osgManipInfo.setMousePosition(ea.getX(), ea.getY());

                    bHandled = m_osgActiveDragger->handle(m_osgManipInfo, ea, aa);
                                        EndGripDrag();
                                }
                                break;
                        }

                        case(GUIEventAdapter::DRAG):
                        {       

                                //If a grip element is selected then process that.
                                if(m_osgActiveDragger)
                                {
                    m_osgManipInfo._hitIter = m_osgManipInfo._hitList.begin();
                                        m_osgManipInfo.setCamera((osg::Camera *) m_osgViewer->getCamera());
                    m_osgManipInfo.setMousePosition(ea.getX(), ea.getY());

                    bHandled = m_osgActiveDragger->handle(m_osgManipInfo, ea, aa);
                                }
                                break;
                        }

                        default:
                                bHandled = false;
                }//end switch statement

                //If this was a release event then make sure the dragger stuff gets reset.
        if (ea.getEventType() == osgGA::GUIEventAdapter::RELEASE)
        {
            m_osgActiveDragger = NULL;
            m_osgManipInfo.reset();
        }

        }  //Eat any erorrs here.
        catch(CStdErrorInfo oError)
        {return false;}
        catch(...)
        {return false;}

        return bHandled;
}

void OsgDraggerHandler::StartGripDrag()
{
        if(m_osgActiveDragger && m_osgActiveDragger->getUserData())
        {
                OsgUserData *osgData = dynamic_cast<OsgUserData *>(m_osgActiveDragger->getUserData());
                if(osgData && osgData->GetMovable())
                {
                        OsgMovableItem *lpItem = osgData->GetOsgMovable();
            if(lpItem && m_lpSim)
            {
                m_lpSim->InDrag(true);
                        lpItem->StartGripDrag();
            }
                }
        }
}

void OsgDraggerHandler::EndGripDrag()
{
        if(m_osgActiveDragger && m_osgActiveDragger->getUserData())
        {
                OsgUserData *osgData = dynamic_cast<OsgUserData *>(m_osgActiveDragger->getUserData());
                if(osgData && osgData->GetMovable())
                {
                        OsgMovableItem *lpItem = osgData->GetOsgMovable();
            if(lpItem && m_lpSim)
            {
                m_lpSim->InDrag(false);
                        lpItem->EndGripDrag();
            }
                }
        }
}

void OsgDraggerHandler::pick(const osgGA::GUIEventAdapter& ea, GUIActionAdapter& aa)
{
    osgUtil::LineSegmentIntersector::Intersections intersections;

    float x = ea.getX();
    float y = ea.getY();        

        //float local_x, local_y = 0.0;    
    const osg::Camera* camera = m_osgViewer->getCamera();
        
        osgUtil::LineSegmentIntersector::CoordinateFrame cf = camera->getViewport() ? osgUtil::Intersector::WINDOW : osgUtil::Intersector::PROJECTION;
    osg::ref_ptr< osgUtil::LineSegmentIntersector > picker = new osgUtil::LineSegmentIntersector(cf, x, y);

        m_osgManipInfo.reset();

        RigidBody *lpBody = NULL;
        Joint *lpJoint = NULL;
    if (m_osgViewer->computeIntersections(x,y,intersections))
    {
                m_osgManipInfo.setCamera((osg::Camera *) camera);
                m_osgManipInfo.setMousePosition(x, y);

#pragma region LineSegmentIntersector

        for(osgUtil::LineSegmentIntersector::Intersections::iterator hitr = intersections.begin();
            hitr != intersections.end();
            ++hitr)
        {       
                        //Add the intersection to the manipulator info
            m_osgManipInfo.addIntersection(hitr->nodePath, hitr->getLocalIntersectPoint());
        }
#pragma endregion

                for (osg::NodePath::iterator itr = m_osgManipInfo._hitList.front().first.begin();
                         itr != m_osgManipInfo._hitList.front().first.end();
                         ++itr)
                {
                        osgManipulator::Dragger* dragger = dynamic_cast<osgManipulator::Dragger*>(*itr);
                        if (dragger)
                        {

                                dragger->handle(m_osgManipInfo, ea, aa);
                                m_osgActiveDragger = dragger;
                StartGripDrag();
                                break;
                        }                   
                }

        }   
}

        }// end Visualization
}// end OsgAnimatSim