void paint_voronoi( CvSubdiv2D* subdiv, IplImage* img )
{
CvSeqReader reader;
int i, total = subdiv->edges->total;
int elem_size = subdiv->edges->elem_size;
cvCalcSubdivVoronoi2D( subdiv );
cvStartReadSeq( (CvSeq*)(subdiv->edges), &reader, 0 );
for( i = 0; i < total; i++ )
{
CvQuadEdge2D* edge = (CvQuadEdge2D*)(reader.ptr);
if( CV_IS_SET_ELEM( edge ))
{
CvSubdiv2DEdge e = (CvSubdiv2DEdge)edge;
// left
draw_subdiv_facet( img, cvSubdiv2DRotateEdge( e, 1 ));
// right
draw_subdiv_facet( img, cvSubdiv2DRotateEdge( e, 3 ));
}
CV_NEXT_SEQ_ELEM( elem_size, reader );
}
}
void PlanarSubdivisionGetSubdiv2DPoints(CvSubdiv2D* subdiv, CvPoint2D32f* points, CvSubdiv2DEdge* edges, int* pointCount)
{
UniquePointSet pointSet;
CvSet* subdivEdges = subdiv->edges;
CvPoint2D32f* currentPoint = points;
CvSubdiv2DEdge* currentEdge = edges;
CvSeqReader reader;
cvStartReadSeq((CvSeq*) subdivEdges, &reader);
schar* start = reader.ptr;
while(CV_IS_SET_ELEM(reader.ptr))
{
CvQuadEdge2D* qEdge = (CvQuadEdge2D*)reader.ptr;
if (qEdge && CV_IS_SET_ELEM(qEdge))
{
CvSubdiv2DEdge e = (CvSubdiv2DEdge) qEdge;
if (e && CV_IS_SET_ELEM(e))
{
CvSubdiv2DPoint* p1 = cvSubdiv2DEdgeOrg(e);
if (p1 &&
pointSet.insert(p1->pt).second &&
PointInRegion(p1->pt, subdiv))
{
*currentPoint++ = p1->pt;
*currentEdge++ = cvSubdiv2DRotateEdge(e, 1);
}
CvSubdiv2DPoint* p2 = cvSubdiv2DEdgeDst(e);
if(p2 &&
pointSet.insert(p2->pt).second &&
PointInRegion(p2->pt, subdiv))
{
*currentPoint++ = p2->pt;
*currentEdge++ = cvSubdiv2DRotateEdge(e, 3);
}
}
}
CV_NEXT_SEQ_ELEM(subdivEdges->elem_size, reader);
// prevent infinite loop
if(reader.ptr == start)
break;
}
*pointCount = currentPoint - points;
}
static void
cvSubdiv2DSplice( CvSubdiv2DEdge edgeA, CvSubdiv2DEdge edgeB )
{
CvSubdiv2DEdge *a_next = &CV_SUBDIV2D_NEXT_EDGE( edgeA );
CvSubdiv2DEdge *b_next = &CV_SUBDIV2D_NEXT_EDGE( edgeB );
CvSubdiv2DEdge a_rot = cvSubdiv2DRotateEdge( *a_next, 1 );
CvSubdiv2DEdge b_rot = cvSubdiv2DRotateEdge( *b_next, 1 );
CvSubdiv2DEdge *a_rot_next = &CV_SUBDIV2D_NEXT_EDGE( a_rot );
CvSubdiv2DEdge *b_rot_next = &CV_SUBDIV2D_NEXT_EDGE( b_rot );
CvSubdiv2DEdge t;
CV_SWAP( *a_next, *b_next, t );
CV_SWAP( *a_rot_next, *b_rot_next, t );
}
void draw_subdiv_facet( IplImage* img, CvSubdiv2DEdge edge )
{
CvSubdiv2DEdge t = edge;
int i, count = 0;
CvPoint* buf = 0;
// count number of edges in facet
do
{
count++;
t = cvSubdiv2DGetEdge( t, CV_NEXT_AROUND_LEFT );
} while (t != edge );
buf = (CvPoint*)malloc( count * sizeof(buf[0]));
// gather points
t = edge;
for( i = 0; i < count; i++ )
{
CvSubdiv2DPoint* pt = cvSubdiv2DEdgeOrg( t );
if( !pt ) break;
buf[i] = cvPoint( cvRound(pt->pt.x), cvRound(pt->pt.y));
t = cvSubdiv2DGetEdge( t, CV_NEXT_AROUND_LEFT );
}
if( i == count )
{
CvSubdiv2DPoint* pt = cvSubdiv2DEdgeDst( cvSubdiv2DRotateEdge( edge, 1 ));
cvFillConvexPoly( img, buf, count, CV_RGB(rand()&255,rand()&255,rand()&255), CV_AA, 0 );
cvPolyLine( img, &buf, &count, 1, 1, CV_RGB(0,0,0), 1, CV_AA, 0);
draw_subdiv_point( img, pt->pt, CV_RGB(0,0,0));
}
free( buf );
}
static void
draw_subdiv_facet( CvSubdiv2D * subdiv, IplImage * dst, IplImage * src, CvSubdiv2DEdge edge )
{
CvSubdiv2DEdge t = edge;
int i, count = 0;
CvPoint local_buf[100];
CvPoint *buf = local_buf;
// count number of edges in facet
do
{
count++;
t = cvSubdiv2DGetEdge( t, CV_NEXT_AROUND_LEFT );
}
while( t != edge && count < subdiv->quad_edges * 4 );
if( count * sizeof( buf[0] ) > sizeof( local_buf ))
{
buf = (CvPoint *) malloc( count * sizeof( buf[0] ));
}
// gather points
t = edge;
for( i = 0; i < count; i++ )
{
CvSubdiv2DPoint *pt = cvSubdiv2DEdgeOrg( t );
if( !pt )
break;
assert( fabs( pt->pt.x ) < 10000 && fabs( pt->pt.y ) < 10000 );
buf[i] = cvPoint( cvRound( pt->pt.x ), cvRound( pt->pt.y ));
t = cvSubdiv2DGetEdge( t, CV_NEXT_AROUND_LEFT );
}
if( i == count )
{
CvSubdiv2DPoint *pt = cvSubdiv2DEdgeDst( cvSubdiv2DRotateEdge( edge, 1 ));
CvPoint ip = cvPoint( cvRound( pt->pt.x ), cvRound( pt->pt.y ));
CvScalar color = {{0,0,0,0}};
//printf("count = %d, (%d,%d)\n", ip.x, ip.y );
if( 0 <= ip.x && ip.x < src->width && 0 <= ip.y && ip.y < src->height )
{
uchar *ptr = (uchar*)(src->imageData + ip.y * src->widthStep + ip.x * 3);
color = CV_RGB( ptr[2], ptr[1], ptr[0] );
}
cvFillConvexPoly( dst, buf, count, color );
//draw_subdiv_point( dst, pt->pt, CV_RGB(0,0,0));
}
if( buf != local_buf )
free( buf );
}
CV_IMPL void
icvDrawMosaic( CvSubdiv2D * subdiv, IplImage * src, IplImage * dst )
{
int i, total = subdiv->edges->total;
cvCalcSubdivVoronoi2D( subdiv );
//icvSet( dst, 255 );
for( i = 0; i < total; i++ )
{
CvQuadEdge2D *edge = (CvQuadEdge2D *) cvGetSetElem( subdiv->edges, i );
if( edge && CV_IS_SET_ELEM( edge ))
{
CvSubdiv2DEdge e = (CvSubdiv2DEdge) edge;
// left
draw_subdiv_facet( subdiv, dst, src, cvSubdiv2DRotateEdge( e, 1 ));
// right
draw_subdiv_facet( subdiv, dst, src, cvSubdiv2DRotateEdge( e, 3 ));
}
}
}
CV_IMPL CvSubdiv2DPoint*
cvFindNearestPoint2D( CvSubdiv2D* subdiv, CvPoint2D32f pt )
{
CvSubdiv2DPoint* point = 0;
CvPoint2D32f start;
CvPoint2D32f diff;
CvSubdiv2DPointLocation loc;
CvSubdiv2DEdge edge;
int i;
if( !subdiv )
CV_Error( CV_StsNullPtr, "" );
if( !CV_IS_SUBDIV2D( subdiv ))
CV_Error( CV_StsNullPtr, "" );
if( subdiv->edges->active_count <= 3 )
return 0;
if( !subdiv->is_geometry_valid )
cvCalcSubdivVoronoi2D( subdiv );
loc = cvSubdiv2DLocate( subdiv, pt, &edge, &point );
switch( loc )
{
case CV_PTLOC_ON_EDGE:
case CV_PTLOC_INSIDE:
break;
default:
return point;
}
point = 0;
start = cvSubdiv2DEdgeOrg( edge )->pt;
diff.x = pt.x - start.x;
diff.y = pt.y - start.y;
edge = cvSubdiv2DRotateEdge( edge, 1 );
for( i = 0; i < subdiv->total; i++ )
{
CvPoint2D32f t;
for(;;)
{
assert( cvSubdiv2DEdgeDst( edge ));
t = cvSubdiv2DEdgeDst( edge )->pt;
if( icvIsRightOf2( t, start, diff ) >= 0 )
break;
edge = cvSubdiv2DGetEdge( edge, CV_NEXT_AROUND_LEFT );
}
for(;;)
{
assert( cvSubdiv2DEdgeOrg( edge ));
t = cvSubdiv2DEdgeOrg( edge )->pt;
if( icvIsRightOf2( t, start, diff ) < 0 )
break;
edge = cvSubdiv2DGetEdge( edge, CV_PREV_AROUND_LEFT );
}
{
CvPoint2D32f tempDiff = cvSubdiv2DEdgeDst( edge )->pt;
t = cvSubdiv2DEdgeOrg( edge )->pt;
tempDiff.x -= t.x;
tempDiff.y -= t.y;
if( icvIsRightOf2( pt, t, tempDiff ) >= 0 )
{
point = cvSubdiv2DEdgeOrg( cvSubdiv2DRotateEdge( edge, 3 ));
break;
}
}
edge = cvSubdiv2DSymEdge( edge );
}
return point;
}
