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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is 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.
*
* 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.
*/
#ifndef OSGSIM_ELEVATIONSLICE
#define OSGSIM_ELEVATIONSLICE 1
#include <osgUtil/IntersectionVisitor>
// include so we can get access to the DatabaseCacheReadCallback
#include <osgSim/LineOfSight>
namespace osgSim {
/** Helper class for setting up and acquiring height above terrain intersections with terrain.*/
class OSGSIM_EXPORT ElevationSlice
{
public :
ElevationSlice();
/** Set the start point of the slice.*/
void setStartPoint(const osg::Vec3d& startPoint) { _startPoint = startPoint; }
/** Get the start point of the slice.*/
const osg::Vec3d& getStartPoint() const { return _startPoint; }
/** Set the end point of the slice.*/
void setEndPoint(const osg::Vec3d& endPoint) { _endPoint = endPoint; }
/** Get the end point of the slice.*/
const osg::Vec3d& getEndPoint() const { return _endPoint; }
typedef std::vector<osg::Vec3d> Vec3dList;
/** Get the intersections in the form of a vector of Vec3d. */
const Vec3dList& getIntersections() const { return _intersections; }
typedef std::pair<double,double> DistanceHeight;
typedef std::vector<DistanceHeight> DistanceHeightList;
/** Get the intersections in the form a vector of pair<double,double> representing distance along the slice and height. */
const DistanceHeightList& getDistanceHeightIntersections() const { return _distanceHeightIntersections; }
/** Compute the intersections with the specified scene graph, the results are stored in vectors of Vec3d.
* Note, if the topmost node is a CoordinateSystemNode then the input points are assumed to be geocentric,
* with the up vector defined by the EllipsoidModel attached to the CoordinateSystemNode.
* If the topmost node is not a CoordinateSystemNode then a local coordinates frame is assumed, with a local up vector. */
void computeIntersections(osg::Node* scene, osg::Node::NodeMask traversalMask=0xffffffff);
/** Compute the vertical distance between the specified scene graph and a single HAT point.*/
static Vec3dList computeElevationSlice(osg::Node* scene, const osg::Vec3d& startPoint, const osg::Vec3d& endPoint, osg::Node::NodeMask traversalMask=0xffffffff);
/** Clear the database cache.*/
void clearDatabaseCache() { if (_dcrc.valid()) _dcrc->clearDatabaseCache(); }
/** Set the ReadCallback that does the reading of external PagedLOD models, and caching of loaded subgraphs.
* Note, if you have multiple LineOfSight or ElevationSlice objects in use at one time then you should share a single
* DatabaseCacheReadCallback between all of them. */
void setDatabaseCacheReadCallback(DatabaseCacheReadCallback* dcrc);
/** Get the ReadCallback that does the reading of external PagedLOD models, and caching of loaded subgraphs.*/
DatabaseCacheReadCallback* getDatabaseCacheReadCallback() { return _dcrc.get(); }
protected :
osg::Vec3d _startPoint;
osg::Vec3d _endPoint;
Vec3dList _intersections;
DistanceHeightList _distanceHeightIntersections;
osg::ref_ptr<DatabaseCacheReadCallback> _dcrc;
osgUtil::IntersectionVisitor _intersectionVisitor;
};
}
#endif
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