source: osgVisual/src/util/visual_util.cpp @ 145

/* -*-c++-*- osgVisual - Copyright (C) 2009-2010 Torben Dannhauer
 *
 * This library is based on OpenSceneGraph, open source and may be redistributed and/or modified under 
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 *
 * osgVisual requires for some proprietary modules a license from the correspondig manufacturer.
 * You have to aquire licenses for all used proprietary modules.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * OpenSceneGraph Public License for more details.
*/

#include <visual_util.h>

using namespace osgVisual;

util::util(void)
{
}

util::~util(void)
{
}

xmlNode* util::getModuleXMLConfig(std::string configFilename, std::string moduleName, xmlDoc*& doc)
{
        doc = NULL;
        xmlNode *root_element = NULL;

        // Check for valid parameters
        if(configFilename == "")
        {
                OSG_ALWAYS << "ERROR - util::getModuleXMLConfig() : Invalid Configuration Filename!" << std::endl;
                return NULL;
        }
        if(moduleName == "")
        {
                OSG_ALWAYS << "ERROR - util::getModuleXMLConfig() : Invalid Module Filename!" << std::endl;
                return NULL;
        }

        // It is a valid XML document?
        doc = xmlReadFile(configFilename.c_str(), NULL, 0);     
        if (doc == NULL)
        {
                OSG_ALWAYS << "ERROR - util::getModuleXMLConfig() : " << configFilename << " is not a valid XML file!" << std::endl;
                return NULL;
        }

        //  Get the root element node
        root_element = xmlDocGetRootElement(doc);

        // Check if it is an osgVisual configuration file
        std::string node_name=reinterpret_cast<const char*>(root_element->name);
        if(!(root_element->type == XML_ELEMENT_NODE && node_name == "osgvisualconfiguration"))
        {
                OSG_ALWAYS << "ERROR - util::getModuleXMLConfig() : " << configFilename << " is not an osgVisual configuration file!" << std::endl;
                return NULL;
        }

        // If file is a valid osgVisual config file, check all the root xml node and all of it's children of osgvisualconfiguration for the specified module
        xmlNode* tmpNode = checkXMLNodeChildrenForModule(root_element, moduleName);

        if( !tmpNode ) // if no valid node was found: clena up. Otherwise: the caller has to clean up.
        {
                xmlFreeDoc(doc);        // free the document
                xmlCleanupParser();     // Free the global variables that may have been allocated by the parser.
                return NULL;
        }
        else
                return tmpNode;

}

xmlNode* util::checkXMLNodeChildrenForModule(xmlNode* node, std::string moduleName)
{
        for (xmlNode *cur_node = node; cur_node; cur_node = cur_node->next)     // iterate through all elements 
        {
                // Is the node the one we are searching for?
                if (cur_node->type == XML_ELEMENT_NODE)
                {
                        std::string node_name=reinterpret_cast<const char*>(cur_node->name);
                        if (node_name == "module")
                        {
                                OSG_DEBUG << "XML node module found" << std::endl;
                                return cur_node;
                        }
                        else    // Otherwise: check its children..
                        {
                                xmlNode* tmp_XmlNode = checkXMLNodeChildrenForModule(cur_node->children, moduleName);
                                if(tmp_XmlNode)
                                        return tmp_XmlNode;
                        }
                }       // IF NODE TYPE = ELEMENT END

                // Proceed with next node in this loop.
        }
}

osg::Node* util::findNamedNode(const std::string& searchName_, osg::Node* currNode_)
{
   osg::Group* currGroup;
   osg::Node* foundNode;

   // check to see if we have a valid (non-NULL) node.
   // if we do have a null node, return NULL.
   if ( !currNode_)
   {
      return NULL;
   }

   // We have a valid node, check to see if this is the node we 
   // are looking for. If so, return the current node.
   if (currNode_->getName() == searchName_)
   {
      return currNode_;
   }

   // We have a valid node, but not the one we are looking for.
   // Check to see if it has children (non-leaf node). If the node
   // has children, check each of the child nodes by recursive call.
   // If one of the recursive calls returns a non-null value we have
   // found the correct node, so return this node.
   // If we check all of the children and have not found the node,
   // return NULL
   currGroup = currNode_->asGroup(); // returns NULL if not a group.
   if ( currGroup ) 
   {
      for (unsigned int i = 0 ; i < currGroup->getNumChildren(); i ++)
      { 
         foundNode = findNamedNode(searchName_, currGroup->getChild(i));
         if (foundNode)
                 {
                         std::cout << "Node gefunden in Ebene: " << i << std::endl;
            return foundNode; // found a match!
                }
      }
      return NULL; // We have checked each child node - no match found.
   }
   else 
   {
      return NULL; // leaf node, no match 
   }
}

osg::ref_ptr<osg::Geode> util::getDemoCylinder(double length_, double width_, osg::Vec3 offset_ )
{
        osg::ref_ptr<osg::Geode> cyl = new osg::Geode();
        osg::ref_ptr<osg::ShapeDrawable> shape = new osg::ShapeDrawable(new osg::Cylinder( offset_, width_, length_ ));
        osg::Vec4 color = osg::Vec4(255.0, 0.0, 0.0, 1.0);
        shape->setColor( color );
        cyl->addDrawable( shape );

        return cyl;
}

osg::ref_ptr<osg::Geode> util::getDemoSphere(double radius_, osg::Vec3 offset_ )
{
        osg::ref_ptr<osg::Geode> sphere = new osg::Geode();
        osg::ref_ptr<osg::ShapeDrawable> shape = new osg::ShapeDrawable(new osg::Sphere( offset_, radius_ ) );
        osg::Vec4 color = osg::Vec4(255.0, 0.0, 0.0, 1.0);
        shape->setColor( color );
        sphere->addDrawable( shape );

        return sphere;
}

bool util::intersect(const osg::Vec3d& start_, const osg::Vec3d& end_, osg::Vec3d& intersection_, osg::Node* node_, osg::Node::NodeMask intersectTraversalMask_ )
{
        osg::ref_ptr<osgUtil::LineSegmentIntersector> lsi = new osgUtil::LineSegmentIntersector(start_,end_);

        osgUtil::IntersectionVisitor iv(lsi.get());
        iv.setTraversalMask(intersectTraversalMask_);
    
        node_->accept(iv);
    
        if (lsi->containsIntersections())
        {
                intersection_ = lsi->getIntersections().begin()->getWorldIntersectPoint();
                return true;    // Intersect found
        }
        return false;   // No intersect found
}

bool util::queryHeightOfTerrain(double& hot_, osg::Node* rootNode_, double lat_, double lon_, osg::Node::NodeMask traversalMask_)
{
        // Get ellipsoid model
        osg::CoordinateSystemNode* csn = dynamic_cast<osg::CoordinateSystemNode*>(rootNode_);
        if ( !csn )
        {
                OSG_NOTIFY( osg::FATAL ) << "util::queryHeightOfTerrain() :: Invalid CSN!" << std::endl;
                return false;
        }
        osg::EllipsoidModel* ellipsoid = csn->getEllipsoidModel();
        if ( !ellipsoid )
        {
                OSG_NOTIFY( osg::FATAL ) << "util::queryHeightOfTerrain() :: Invalid ellipsoid!" << std::endl;
                return false;
        }

        // Setup both endpoints of intersect line
        double X,Y,Z;
        ellipsoid->convertLatLongHeightToXYZ(lat_, lon_, 30000, X, Y, Z);
        osg::Vec3d s = osg::Vec3d(X, Y, Z);
        ellipsoid->convertLatLongHeightToXYZ(lat_, lon_, -30000, X, Y, Z);
        osg::Vec3d e = osg::Vec3d(X, Y, Z);

        // Query intersection point
        osg::Vec3d ip;
        if ( util::intersect(s, e, ip, rootNode_, traversalMask_) )
        {
                double lat2_, lon2_;
                ellipsoid->convertXYZToLatLongHeight( ip.x(), ip.y(), ip.z(), lat2_, lon2_, hot_ );     // Convert Intersection Point back to Lat Lon, HOT.
                //OSG_NOTIFY(osg::ALWAYS) << "lat: "<< osg::RadiansToDegrees(lat2_) <<", Lon: " << osg::RadiansToDegrees(lon2_) << ", Hot: " << hot_ << std::endl;
                return true;
        }

        // If no intersection point found: set HOT to zero and return false.
        hot_ = 0;
        return false;
}

bool util::queryHeightAboveTerrainInWGS84(double& hat_, osg::Node* rootNode_, double lat_, double lon_, double height_, osg::Node::NodeMask traversalMask_)
{
        // Get HOT by asking util::queryHeightOfTerrain() :)
        double HOT;
        if ( !util::queryHeightOfTerrain(HOT, rootNode_, lat_, lon_, traversalMask_) )
        {
                OSG_NOTIFY( osg::INFO ) << "util::queryHeightAboveTerrainInWGS84() :: Unable to get HOT, will use 0 for HOT!" << std::endl;
        }

        // Calculate HAT
        hat_ = height_ - HOT;
        return true;
}

bool util::queryHeightAboveTerrainInWorld(double& hat_, osg::Node* rootNode_, double x_, double y_, double z_, osg::Node::NodeMask traversalMask_)
{
        // Get ellipsoid model
        osg::CoordinateSystemNode* csn = dynamic_cast<osg::CoordinateSystemNode*>(rootNode_);
        if ( !csn )
        {
                OSG_NOTIFY( osg::FATAL ) << "util::queryHeightAboveTerrainInWorld() :: Invalid CSN!" << std::endl;
                return false;
        }
        osg::EllipsoidModel* ellipsoid = csn->getEllipsoidModel();
        if ( !ellipsoid )
        {
                OSG_NOTIFY( osg::FATAL ) << "util::queryHeightAboveTerrainInWorld() :: Invalid ellipsoid!" << std::endl;
                return false;
        }

        // Transform XYZ into LatLonHeight
        double lat_, lon_, height_;
        ellipsoid->convertXYZToLatLongHeight(x_, y_, z_, lat_, lon_, height_);

        // ask util::queryHeightAboveTerrainInWGS84() to calc HAT :)
        if( !util::queryHeightAboveTerrainInWGS84(hat_, rootNode_, lat_, lon_, height_, traversalMask_ ) )
        {
                OSG_NOTIFY( osg::FATAL ) << "util::queryHeightAboveTerrainInWorld() :: Unable to get HAT!" << std::endl;
                return false;
        }

        return true;
}

bool util::calculateEarthRadiusAtWGS84Coordinate(double lat_, double lon_, osg::Node* rootNode_, double& radius_)
{
        // Calculate radius:
        double x, y, z;
        
        if ( util::calculateXYZAtWGS84Coordinate(lat_, lon_, 0.0, rootNode_, x, y, z) )
        {
                radius_ = sqrt( pow(x, 2) + pow(y, 2) + pow(z, 2) );
                return true;
        }
        else
        {
                OSG_NOTIFY( osg::FATAL ) << "util::calculateEarthRadiusAtWGS84Coordinate() :: Unable to calculate Earth Radius!" << std::endl;
                return false;
        }
}

bool util::calculateXYZAtWGS84Coordinate(double lat_, double lon_, double height_, osg::Node* rootNode_, double& x_, double& y_, double& z_)
{
        // Get ellipsoid model
        osg::CoordinateSystemNode* csn = dynamic_cast<osg::CoordinateSystemNode*>(rootNode_);
        if ( !csn )
                return false;
        osg::EllipsoidModel* ellipsoid = csn->getEllipsoidModel();
        if ( !ellipsoid )
                return false;

        // Calculate xyz:
        ellipsoid->convertLatLongHeightToXYZ( lat_, lon_, height_, x_, y_, z_);
        return true;
}

bool util::getWGS84ofCamera( osg::Camera* camera_, osg::Node* rootNode_, double& lat_, double& lon_, double& height_ )
{
        // Get ellipsoid model
        osg::CoordinateSystemNode* csn = dynamic_cast<osg::CoordinateSystemNode*>(rootNode_);
        if ( !csn )
                return false;
        osg::EllipsoidModel* ellipsoid = csn->getEllipsoidModel();
        if ( !ellipsoid )
                return false;

        osg::Vec3d eye, dir, up;
        camera_->getViewMatrixAsLookAt(eye,dir,up); // Get XYZ from camera
        ellipsoid->convertXYZToLatLongHeight(eye.x(), eye.y(), eye.z(), lat_, lon_, height_);
        return true;
}

void util::getXYZofCamera( osg::Camera* camera_, double& x_, double& y_, double& z_ )
{
        osg::Vec3d eye, dir, up;
        camera_->getViewMatrixAsLookAt(eye,dir,up); // Get XYZ from camera
        x_ = eye.x();
        y_ = eye.y();
        z_ = eye.z();
}

bool util::removeClosebuttonOnGLWindow(osgViewer::Viewer* viewer_)
{
#ifdef FUNFUNCTIONS_ENABLED
#ifdef WIN32
        osgViewer::ViewerBase::Windows wins;
        viewer_->getWindows(wins);
        osgViewer::GraphicsHandleWin32* hwnd = dynamic_cast<osgViewer::GraphicsHandleWin32*>(wins[0]);
        
        HMENU hMenu = GetSystemMenu(hwnd->getHWND(), FALSE);
        ::EnableMenuItem(hMenu, SC_CLOSE, MF_BYCOMMAND | (MF_DISABLED | MF_GRAYED)); 
#endif
#endif
        return true;
}

bool util::setTransparentWindowBackground(osgViewer::Viewer* viewer_)
{
#ifdef FUNFUNCTIONS_ENABLED
#ifdef WIN32
        osgViewer::ViewerBase::Windows wins;
        viewer_->getWindows(wins);
        osgViewer::GraphicsHandleWin32* hwnd = dynamic_cast<osgViewer::GraphicsHandleWin32*>(wins[0]);
        HWND _hwnd = hwnd->getHWND();
        viewer_->getDisplaySettings()->setMinimumNumAlphaBits(8);

   // Create and populate the Blur Behind structure
   DWM_BLURBEHIND bb = {0};
   // Disable Blur Behind and Blur Region;
   bb.dwFlags = DWM_BB_ENABLE;
   bb.fEnable = true;
   bb.hRgnBlur = NULL;

   // Ensable Blur Behind
   HRESULT hr = DwmEnableBlurBehindWindow(_hwnd, &bb);
   if (SUCCEEDED(hr))
      return true;
   else
           return false;

#endif
#endif
        return true;
}