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Added osgUtil::IntersectorGroup to handle groups of osgUtil::Intersectors

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This commit is contained in:
Robert Osfield
2006-10-27 15:11:17 +00:00
parent 0fe424996d
commit 358b96e953
3 changed files with 289 additions and 50 deletions
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71
include/osgUtil/IntersectionVisitor
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@@ -33,29 +33,40 @@ class Intersector : public osg::Referenced
{
public:
Intersector():
_disabledCount(0) {}
virtual Intersector* clone(osgUtil::IntersectionVisitor& iv) = 0;
virtual void merge(Intersector* intersector) = 0;
virtual bool enter(const osg::Node& node) = 0;
virtual void leave() = 0;
virtual void intersect(osgUtil::IntersectionVisitor& iv, osg::Drawable* drawable) = 0;
virtual void reset() = 0;
virtual void reset() { _disabledCount = 0; }
virtual bool containsIntersections() = 0;
inline bool disabled() const { return _disabledCount!=0; }
inline void incrementDisabledCount() { ++_disabledCount; }
inline void decrementDisabledCount() { if (_disabledCount>0) --_disabledCount; }
protected:
unsigned int _disabledCount;
};
/** Concrent class for implementing line intersections with the scene graph.
* To be used in conjunction with IntersectionVisitor. */
class LineSegmentIntersector : public Intersector
class OSGUTIL_EXPORT LineSegmentIntersector : public Intersector
{
public:
LineSegmentIntersector(const osg::Vec3d& start, const osg::Vec3d& end);
LineSegmentIntersector(const osg::Vec3d& start, const osg::Vec3d& end, LineSegmentIntersector* parent=0);
struct Intersection
{
@@ -75,14 +86,15 @@ class LineSegmentIntersector : public Intersector
typedef std::multiset<Intersection> Intersections;
Intersections& getIntersections() { return _intersections; }
inline void insertIntersection(const Intersection& intersection) { getIntersections().insert(intersection); }
inline Intersections& getIntersections() { return _parent ? _parent->_intersections : _intersections; }
public:
virtual Intersector* clone(osgUtil::IntersectionVisitor& iv);
virtual void merge(Intersector* intersector);
virtual bool enter(const osg::Node& node);
virtual void leave();
@@ -98,6 +110,8 @@ class LineSegmentIntersector : public Intersector
bool intersects(const osg::BoundingSphere& bs);
bool intersectAndClip(osg::Vec3d& s, osg::Vec3d& e,const osg::BoundingBox& bb);
LineSegmentIntersector* _parent;
osg::Vec3d _start;
osg::Vec3d _end;
@@ -105,6 +119,45 @@ class LineSegmentIntersector : public Intersector
};
/** Concrent class for passing multiple intersectors through the scene graph.
* To be used in conjunction with IntersectionVisitor. */
class OSGUTIL_EXPORT IntersectorGroup : public Intersector
{
public:
IntersectorGroup();
/** Add an Intersector. */
void addIntersector(Intersector* intersector);
typedef std::vector< osg::ref_ptr<Intersector> > Intersectors;
/** Get the list of intersector. */
Intersectors& getIntersectors() { return _intersectors; }
/** Clear the list of intersectors.*/
void clear();
public:
virtual Intersector* clone(osgUtil::IntersectionVisitor& iv);
virtual bool enter(const osg::Node& node);
virtual void leave();
virtual void intersect(osgUtil::IntersectionVisitor& iv, osg::Drawable* drawable);
virtual void reset();
virtual bool containsIntersections();
protected:
Intersectors _intersectors;
};
/** InteresectionVisitor is used to testing for intersections with the scene, traversing the scene using generic osgUtil::Intersector's to test against the scene.
* To implement different types of intersection techniques, one implements custom versions of the osgUtil::Intersector, and then
* pass the constructed intersector to the IntersectionVisitor.*/
@@ -170,7 +223,7 @@ class OSGUTIL_EXPORT IntersectionVisitor : public osg::NodeVisitor
inline void leave() { _intersectorStack.back()->leave(); }
inline void intersect(osg::Drawable* drawable) { _intersectorStack.back()->intersect(*this, drawable); }
inline void push_clone() { _intersectorStack.push_back ( _intersectorStack.front()->clone(*this) ); }
inline void pop_clone() { if (_intersectorStack.size()>=2) { _intersectorStack.front()->merge(_intersectorStack.back().get()); _intersectorStack.pop_back(); } }
inline void pop_clone() { if (_intersectorStack.size()>=2) _intersectorStack.pop_back(); }
typedef std::list< osg::ref_ptr<Intersector> > IntersectorStack;
IntersectorStack _intersectorStack;