Fixed issue with events having a negative delta of time between them.

include/osgGA/EventQueue

@@ -41,6 +41,9 @@ class OSGGA_EXPORT EventQueue : public osg::Referenced
         /** Take the entire event queue leaving the EventQueue' event queue empty.*/
         bool takeEvents(Events& events);
 
+        /** Take the events that were recorded before with specified time queue.*/
+        bool takeEvents(Events& events, double cutOffTime);
+
         /** Take a copy the entire event queue leaving the EventQueue' event queue intact.*/
         bool copyEvents(Events& events) const;
 

src/osgGA/EventQueue.cpp

@@ -62,6 +62,34 @@ bool EventQueue::takeEvents(Events& events)
     }
 }
 
+bool EventQueue::takeEvents(Events& events, double cutOffTime)
+{
+    OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_eventQueueMutex);
+    if (!_eventQueue.empty())
+    {
+        bool eventsTaken = false;
+        Events::iterator itr = _eventQueue.begin();
+        for(;
+            itr != _eventQueue.end() && ((*itr)->getTime() <= cutOffTime);
+            ++itr)
+        {
+            events.push_back(*itr);
+            eventsTaken = true;
+        }
+
+        if (eventsTaken)
+        {
+            _eventQueue.erase(_eventQueue.begin(), itr);
+        }
+        
+        return eventsTaken;
+    }
+    else
+    {
+        return false;
+    }
+}
+
 bool EventQueue::copyEvents(Events& events) const
 {
     OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_eventQueueMutex);

src/osgViewer/CompositeViewer.cpp

@@ -635,6 +635,15 @@ void CompositeViewer::advance(double simulationTime)
         _frameStamp->setSimulationTime(simulationTime);
     }
 
+    for(RefViews::iterator vitr = _views.begin();
+        vitr != _views.end();
+        ++vitr)
+    {
+        View* view = vitr->get();
+        view->getEventQueue()->frame( getFrameStamp()->getReferenceTime() );
+    }
+
+
     if (getViewerStats() && getViewerStats()->collectStats("frame_rate"))
     {
         // update previous frame stats
@@ -676,6 +685,8 @@ void CompositeViewer::eventTraversal()
 
     if (_views.empty()) return;
 
+    double cutOffTime = _frameStamp->getReferenceTime();
+    
     double beginEventTraversal = osg::Timer::instance()->delta_s(_startTick, osg::Timer::instance()->tick());
 
     // OSG_NOTICE<<"CompositeViewer::frameEventTraversal()."<<std::endl;
@@ -716,7 +727,7 @@ void CompositeViewer::eventTraversal()
             gw->checkEvents();
 
             osgGA::EventQueue::Events gw_events;
-            gw->getEventQueue()->takeEvents(gw_events);
+            gw->getEventQueue()->takeEvents(gw_events, cutOffTime);
 
             osgGA::EventQueue::Events::iterator itr;
             for(itr = gw_events.begin();
@@ -895,8 +906,7 @@ void CompositeViewer::eventTraversal()
         ++vitr)
     {
         View* view = vitr->get();
-        view->getEventQueue()->frame( getFrameStamp()->getReferenceTime() );
-        view->getEventQueue()->takeEvents(viewEventsMap[view]);
+        view->getEventQueue()->takeEvents(viewEventsMap[view], cutOffTime);
     }
 
 

src/osgViewer/Viewer.cpp

@@ -584,6 +584,11 @@ void Viewer::advance(double simulationTime)
         _frameStamp->setSimulationTime(simulationTime);
     }
 
+    if (_eventQueue.valid())
+    {
+        _eventQueue->frame( getFrameStamp()->getReferenceTime() );
+    }
+
     if (getViewerStats() && getViewerStats()->collectStats("frame_rate"))
     {
         // update previous frame stats
@@ -595,6 +600,7 @@ void Viewer::advance(double simulationTime)
         getViewerStats()->setAttribute(_frameStamp->getFrameNumber(), "Reference time", _frameStamp->getReferenceTime());
     }
 
+
     if (osg::Referenced::getDeleteHandler())
     {
         osg::Referenced::getDeleteHandler()->flush();
@@ -607,6 +613,7 @@ void Viewer::eventTraversal()
 {
     if (_done) return;
 
+    double cutOffTime = _frameStamp->getReferenceTime();
     double beginEventTraversal = osg::Timer::instance()->delta_s(_startTick, osg::Timer::instance()->tick());
 
     // OSG_NOTICE<<"Viewer::frameEventTraversal()."<<std::endl;
@@ -645,7 +652,7 @@ void Viewer::eventTraversal()
             gw->checkEvents();
 
             osgGA::EventQueue::Events gw_events;
-            gw->getEventQueue()->takeEvents(gw_events);
+            gw->getEventQueue()->takeEvents(gw_events, cutOffTime);
 
             osgGA::EventQueue::Events::iterator itr;
             for(itr = gw_events.begin();
@@ -791,9 +798,7 @@ void Viewer::eventTraversal()
 
     // OSG_NOTICE<<"mouseEventState Xmin = "<<eventState->getXmin()<<" Ymin="<<eventState->getYmin()<<" xMax="<<eventState->getXmax()<<" Ymax="<<eventState->getYmax()<<std::endl;
 
-
-    _eventQueue->frame( getFrameStamp()->getReferenceTime() );
-    _eventQueue->takeEvents(events);
+    _eventQueue->takeEvents(events, cutOffTime);
 
 
 #if 0