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added methods for removing things from a hashed grids

This commit is contained in:
Paolo Cignoni 2009-11-25 15:49:54 +00:00
parent 1532b46428
commit 7e02dbb4f8
1 changed files with 355 additions and 317 deletions
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42
vcg/space/index/spatial_hashing.h
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@ -115,6 +115,11 @@ namespace vcg{
void operator ++() {t++;} void operator ++() {t++;}
}; };
size_t CellSize(const Point3i &cell)
{
return hash_table.count(cell);
}
protected: protected:
///insert a new cell ///insert a new cell
@ -124,6 +129,27 @@ namespace vcg{
hash_table.insert(typename HashType::value_type(cell, s)); hash_table.insert(typename HashType::value_type(cell, s));
} }
///remove all the objects in a cell
void RemoveCell(const Point3i &cell)
{
}
///insert a new cell
bool RemoveObject(ObjType* s, const Point3i &cell)
{
std::pair<HashIterator,HashIterator> CellRange = hash_table.equal_range(cell);
CellIterator first; first.t=CellRange.first;
CellIterator end; end.t=CellRange.second;
for(CellIterator ci = first; ci!=end;++ci)
{
if (*ci == s)
{
hash_table.erase(ci.t);
return true;
}
}
return false;
}
public: public:
@ -142,6 +168,18 @@ namespace vcg{
return bb; return bb;
} }
void Remove( ObjType* s)
{
Box3<ScalarType> b;
s->GetBBox(b);
vcg::Box3i bb;
BoxToIBox(b,bb);
//then remove the obj from all the cell of bb
for (int i=bb.min.X();i<=bb.max.X();i++)
for (int j=bb.min.Y();j<=bb.max.Y();j++)
for (int k=bb.min.Z();k<=bb.max.Z();k++)
RemoveObject(s,vcg::Point3i(i,j,k));
}
/// set an empty spatial hash table /// set an empty spatial hash table
void InitEmpty(const Box3x &_bbox, vcg::Point3i grid_size) void InitEmpty(const Box3x &_bbox, vcg::Point3i grid_size)
@ -200,7 +238,7 @@ namespace vcg{
///return the simplexes of the cell that contain p ///return the simplexes of the cell that contain p
void Grid( const Point3<ScalarType> & p, CellIterator & first, CellIterator & last ) void GridReal( const Point3<ScalarType> & p, CellIterator & first, CellIterator & last )
{ {
vcg::Point3i _c; vcg::Point3i _c;
this->PToIP(p,_c); this->PToIP(p,_c);
@ -210,7 +248,7 @@ namespace vcg{
///return the simplexes on a specified cell ///return the simplexes on a specified cell
void Grid( int x,int y,int z, CellIterator & first, CellIterator & last ) void Grid( int x,int y,int z, CellIterator & first, CellIterator & last )
{ {
Grid(vcg::Point3i(x,y,z),first,last); this->Grid(vcg::Point3i(x,y,z),first,last);
} }
///return the simplexes on a specified cell ///return the simplexes on a specified cell