From 927942a0f8dce37a5b37851a3d24c0904c9cca78 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Fri, 15 Aug 2008 12:45:20 +0000
Subject: [PATCH] Further work on osg::ImageSequence, improving pause
 functionality, and introducing new seek(double time) method

---
 .../osgimagesequence/osgimagesequence.cpp     |  1 -
 include/osg/ImageSequence                     | 13 +++--
 include/osg/ImageStream                       |  2 +
 src/osg/ImageSequence.cpp                     | 53 ++++++++++++++-----
 4 files changed, 51 insertions(+), 18 deletions(-)

diff --git a/examples/osgimagesequence/osgimagesequence.cpp b/examples/osgimagesequence/osgimagesequence.cpp
index 30cfeef8c..47f0844bd 100644
--- a/examples/osgimagesequence/osgimagesequence.cpp
+++ b/examples/osgimagesequence/osgimagesequence.cpp
@@ -225,7 +225,6 @@ bool MovieEventHandler::handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIAction
                 {
                     std::cout<<"Restart"<<std::endl;
                     (*itr)->rewind();
-                    (*itr)->play();
                 }
                 return true;
             }
diff --git a/include/osg/ImageSequence b/include/osg/ImageSequence
index a76c0416f..31726c0e7 100644
--- a/include/osg/ImageSequence
+++ b/include/osg/ImageSequence
@@ -51,6 +51,8 @@ class OSG_EXPORT ImageSequence : public ImageStream
         typedef std::list< osg::ref_ptr<osg::Image> >   Images;
         typedef std::list< std::string >                FileNames;
         
+        virtual void seek(double time);
+
         virtual void play();
 
         virtual void pause();
@@ -112,15 +114,18 @@ class OSG_EXPORT ImageSequence : public ImageStream
         FileNames::iterator             _fileNamesIterator;
         double                          _fileNamesIteratorTime;
 
-        double                          _imageHeadTime;
         Images                          _images;
-        Images::iterator                _imageIterator;
-        double                          _imageIteratorTime;
         
         typedef std::pair< std::string, osg::ref_ptr<osg::Image> >  FileNameImagePair;
         typedef std::list< FileNameImagePair >  FileNameImageList;
-        
         FileNameImageList               _filesRequested;
+                
+        Images::iterator                _imageIterator;
+        double                          _imageIteratorTime;
+        
+        bool                            _seekTimeSet;
+        double                          _seekTime;
+        
 
 };
 
diff --git a/include/osg/ImageStream b/include/osg/ImageStream
index 0b4dd86c1..5c1b543ce 100644
--- a/include/osg/ImageStream
+++ b/include/osg/ImageStream
@@ -46,6 +46,8 @@ class OSG_EXPORT ImageStream : public Image
             REWINDING
         };
         
+        virtual void seek(double /*time*/) {}
+
         virtual void play() { _status=PLAYING; }
 
         virtual void pause() { _status=PAUSED; }
diff --git a/src/osg/ImageSequence.cpp b/src/osg/ImageSequence.cpp
index cac513b77..ce5333f5f 100644
--- a/src/osg/ImageSequence.cpp
+++ b/src/osg/ImageSequence.cpp
@@ -49,7 +49,10 @@ ImageSequence::ImageSequence()
     _fileNamesIteratorTime = DBL_MAX;
 
     _imageIterator = _images.end();
-    _imageIteratorTime = DBL_MAX;
+    _imageIteratorTime = 0.0;
+    
+    _seekTime = 0.0;
+    _seekTimeSet = false;
 }
 
 ImageSequence::ImageSequence(const ImageSequence& is,const CopyOp& copyop):
@@ -63,8 +66,11 @@ ImageSequence::ImageSequence(const ImageSequence& is,const CopyOp& copyop):
     _fileNamesIterator = _fileNames.end();
     _fileNamesIteratorTime = DBL_MAX;
 
-    _imageIteratorTime = DBL_MAX;
+    _imageIteratorTime = 0.0;
     _imageIterator = _images.end();
+
+    _seekTime = is._seekTime;
+    _seekTimeSet = is._seekTimeSet;
 }
 
 int ImageSequence::compare(const Image& rhs) const
@@ -72,6 +78,12 @@ int ImageSequence::compare(const Image& rhs) const
     return ImageStream::compare(rhs);
 }
 
+void ImageSequence::seek(double time)
+{
+    _seekTime = time;
+    _seekTimeSet = true;
+}
+
 void ImageSequence::play()
 {
     _status=PLAYING;
@@ -84,7 +96,7 @@ void ImageSequence::pause()
 
 void ImageSequence::rewind()
 {
-    _status=REWINDING;
+    seek(0.0f);
 }
 
 void ImageSequence::setMode(Mode mode)
@@ -171,7 +183,7 @@ void ImageSequence::addImage(osg::Image* image)
     if (data()==0)
     {
         _imageIterator = _images.begin();
-        _imageIteratorTime = _referenceTime;
+        _imageIteratorTime = 0.0;
         setImageToChild(_imageIterator->get());
     }
 }
@@ -209,22 +221,29 @@ void ImageSequence::update(osg::NodeVisitor* nv)
         _fileNamesIteratorTime = _referenceTime;
     }
     
-    if (_imageIteratorTime == DBL_MAX)
-    {
-        _imageIteratorTime = _referenceTime;
-    }
-    
+    bool looping = getLoopingMode()==LOOPING;
     double time = (fs->getSimulationTime() - _referenceTime)*_timeMultiplier;
     
-    if (_status==PAUSED || _status==INVALID) time = _imageIteratorTime;
+    if (_seekTimeSet || _status==PAUSED || _status==INVALID)
+    {
+        time = _seekTime;        
+        _referenceTime =  fs->getSimulationTime() - time/_timeMultiplier;
+    }
+    
+    if (time>_duration)
+    {
+        time -= floor(time/_duration)*_duration;
+    }
             
+    _seekTime = time;
+    _seekTimeSet = false;
+
     FileNames::iterator previous_fileNamesIterator = _fileNamesIterator;
     Images::iterator previous_imageIterator = _imageIterator;
     
     bool pruneOldImages = false;
     
-    bool looping = getLoopingMode()==LOOPING;
-
+    
     switch(_mode)
     {
         case(PRE_LOAD_ALL_IMAGES):
@@ -295,11 +314,19 @@ void ImageSequence::update(osg::NodeVisitor* nv)
         }
     }
         
+
+
     {
-    
         //
         // Advance imageIterator
         //
+
+        if (time<_imageIteratorTime)
+        {
+            _imageIterator = _images.begin();
+            _imageIteratorTime = 0.0;
+        }
+
         if (_imageIterator!=_images.end())
         {
             // osg::notify(osg::NOTICE)<<"   _imageIteratorTime = "<<_imageIteratorTime<<std::endl;