void _FillAdjMatrix( CvGraph* graph, int** connected, int reverse )
{
//assume all vertices are marked
for( int i = 0; i < graph->total; i++ )
{
for( int j = 0; j < graph->total; j++ )
{
connected[i][j] = 0|reverse;
}
//memset( connected[i], 0, sizeof(int)*graph->total );
CvGraphVtx* ver = cvGetGraphVtx( graph, i );
if( ver )
{
connected[i][i] = 1;
for( CvGraphEdge* e = ver->first; e ; e = CV_NEXT_GRAPH_EDGE( e, ver ) )
{
CvGraphVtx* v = CV_GET_ADJ_VTX( ver, e );
connected[i][NUMBER(v)] = 1^reverse;
}
}
}
}
CV_IMPL int
icvNextGraphItem( CvGraphScanner* scanner )
{
int code = -1;
CV_FUNCNAME("icvNextGraphItem");
__BEGIN__;
CvGraphVtx* vtx;
CvGraphVtx* dst;
CvGraphEdge* edge;
CvGraphItem item;
if( !scanner || !(scanner->stack))
CV_ERROR_FROM_STATUS( CV_NULLPTR_ERR );
dst = scanner->dst;
vtx = scanner->vtx;
edge = scanner->edge;
for(;;)
{
for(;;)
{
if( dst && !CV_IS_GRAPH_VERTEX_VISITED(dst) )
{
scanner->vtx = vtx = dst;
edge = vtx->first;
dst->flags |= CV_GRAPH_ITEM_VISITED_FLAG;
if((scanner->mask & CV_GRAPH_VERTEX))
{
scanner->vtx = vtx;
scanner->edge = vtx->first;
scanner->dst = 0;
code = CV_GRAPH_VERTEX;
EXIT;
}
}
while( edge )
{
dst = edge->vtx[vtx == edge->vtx[0]];
if( !CV_IS_GRAPH_EDGE_VISITED(edge) )
{
// check that the edge is outcoming
if( !CV_IS_GRAPH_ORIENTED( scanner->graph ) || dst != edge->vtx[0] )
{
edge->flags |= CV_GRAPH_ITEM_VISITED_FLAG;
code = CV_GRAPH_BACK_EDGE;
if( !CV_IS_GRAPH_VERTEX_VISITED(dst) )
{
item.vtx = vtx;
item.edge = edge;
vtx->flags |= CV_GRAPH_SEARCH_TREE_NODE_FLAG;
cvSeqPush( scanner->stack, &item );
if( scanner->mask & CV_GRAPH_TREE_EDGE )
{
code = CV_GRAPH_TREE_EDGE;
scanner->dst = dst;
scanner->edge = edge;
EXIT;
}
break;
}
else
{
if( scanner->mask & (CV_GRAPH_BACK_EDGE|
CV_GRAPH_CROSS_EDGE|
CV_GRAPH_FORWARD_EDGE) )
{
code = (dst->flags & CV_GRAPH_SEARCH_TREE_NODE_FLAG) ?
CV_GRAPH_BACK_EDGE :
(edge->flags & CV_GRAPH_FORWARD_EDGE_FLAG) ?
CV_GRAPH_FORWARD_EDGE : CV_GRAPH_CROSS_EDGE;
edge->flags &= ~CV_GRAPH_FORWARD_EDGE_FLAG;
if( scanner->mask & code )
{
scanner->vtx = vtx;
scanner->dst = dst;
scanner->edge = edge;
EXIT;
}
}
}
}
else if( (dst->flags & (CV_GRAPH_ITEM_VISITED_FLAG|
CV_GRAPH_SEARCH_TREE_NODE_FLAG)) ==
(CV_GRAPH_ITEM_VISITED_FLAG|
CV_GRAPH_SEARCH_TREE_NODE_FLAG))
{
edge->flags |= CV_GRAPH_FORWARD_EDGE_FLAG;
}
}
edge = CV_NEXT_GRAPH_EDGE( edge, vtx );
}
if( !edge ) // need to backtrack
{
if( scanner->stack->total == 0 )
{
if( scanner->index >= 0 )
vtx = 0;
else
scanner->index = 0;
break;
}
cvSeqPop( scanner->stack, &item );
vtx = item.vtx;
vtx->flags &= ~CV_GRAPH_SEARCH_TREE_NODE_FLAG;
edge = item.edge;
dst = 0;
if( scanner->mask & CV_GRAPH_BACKTRACKING )
{
scanner->vtx = vtx;
scanner->edge = edge;
scanner->dst = edge->vtx[vtx == edge->vtx[0]];
code = CV_GRAPH_BACKTRACKING;
EXIT;
}
}
}
if( !vtx )
{
vtx = (CvGraphVtx*)icvSeqFindNextElem( (CvSeq*)(scanner->graph),
CV_FIELD_OFFSET( flags, CvGraphVtx ), CV_GRAPH_ITEM_VISITED_FLAG|1,
0, &(scanner->index) );
if( !vtx )
{
code = CV_GRAPH_OVER;
icvEndScanGraph( scanner );
scanner->stack = 0;
break;
}
}
dst = vtx;
if( scanner->mask & CV_GRAPH_NEW_TREE )
{
scanner->dst = dst;
scanner->edge = 0;
scanner->vtx = 0;
code = CV_GRAPH_NEW_TREE;
break;
}
}
__END__;
return code;
}
