CV_INLINE int
icvIsPtInCircle3( CvPoint2D32f pt, CvPoint2D32f a, CvPoint2D32f b, CvPoint2D32f c )
{
double val = (a.x * a.x + a.y * a.y) * cvTriangleArea( b, c, pt );
val -= (b.x * b.x + b.y * b.y) * cvTriangleArea( a, c, pt );
val += (c.x * c.x + c.y * c.y) * cvTriangleArea( a, b, pt );
val -= (pt.x * pt.x + pt.y * pt.y) * cvTriangleArea( a, b, c );
return val > FLT_EPSILON ? 1 : val < -FLT_EPSILON ? -1 : 0;
}
CV_INLINE int
icvIsPtInCircle3( CvPoint2D32f pt, CvPoint2D32f a, CvPoint2D32f b, CvPoint2D32f c )
{
const double eps = FLT_EPSILON*0.125;
double val = ((double)a.x * a.x + (double)a.y * a.y) * cvTriangleArea( b, c, pt );
val -= ((double)b.x * b.x + (double)b.y * b.y) * cvTriangleArea( a, c, pt );
val += ((double)c.x * c.x + (double)c.y * c.y) * cvTriangleArea( a, b, pt );
val -= ((double)pt.x * pt.x + (double)pt.y * pt.y) * cvTriangleArea( a, b, c );
return val > eps ? 1 : val < -eps ? -1 : 0;
}
static int
icvIsRightOf( CvPoint2D32f& pt, CvSubdiv2DEdge edge )
{
CvSubdiv2DPoint *org = cvSubdiv2DEdgeOrg(edge), *dst = cvSubdiv2DEdgeDst(edge);
double cw_area = cvTriangleArea( pt, dst->pt, org->pt );
return (cw_area > 0) - (cw_area < 0);
}
static int
icvIsRightOf( CvPoint2D32f& pt, CvSubdiv2DEdge edge )
{
CvSubdiv2DPoint *org = cvSubdiv2DEdgeOrg(edge), *dst = cvSubdiv2DEdgeDst(edge);
Cv32suf cw_area;
cw_area.f = (float)cvTriangleArea( pt, dst->pt, org->pt );
return (cw_area.i > 0)*2 - (cw_area.i*2 != 0);
}
static int
icvIsRightOf( CvPoint2D32f& pt, CvSubdiv2DEdge edge )
{
CvSubdiv2DPoint *org = cvSubdiv2DEdgeOrg(edge), *dst = cvSubdiv2DEdgeDst(edge);
float cw_area = (float)cvTriangleArea( pt, dst->pt, org->pt );
int iarea = (int&)cw_area;
return (iarea > 0)*2 - (iarea + iarea != 0);
}
CV_IMPL CvSubdiv2DPointLocation
cvSubdiv2DLocate( CvSubdiv2D * subdiv, CvPoint2D32f pt,
CvSubdiv2DEdge * _edge, CvSubdiv2DPoint ** _point )
{
CvSubdiv2DPoint *point = 0;
int right_of_curr = 0;
if( !subdiv )
CV_Error( CV_StsNullPtr, "" );
if( !CV_IS_SUBDIV2D(subdiv) )
CV_Error( CV_StsBadFlag, "" );
int i, max_edges = subdiv->quad_edges * 4;
CvSubdiv2DEdge edge = subdiv->recent_edge;
if( max_edges == 0 )
CV_Error( CV_StsBadSize, "" );
CV_Assert(edge != 0);
if( pt.x < subdiv->topleft.x || pt.y < subdiv->topleft.y ||
pt.x >= subdiv->bottomright.x || pt.y >= subdiv->bottomright.y )
CV_Error( CV_StsOutOfRange, "" );
CvSubdiv2DPointLocation location = CV_PTLOC_ERROR;
right_of_curr = icvIsRightOf( pt, edge );
if( right_of_curr > 0 )
{
edge = cvSubdiv2DSymEdge( edge );
right_of_curr = -right_of_curr;
}
for( i = 0; i < max_edges; i++ )
{
CvSubdiv2DEdge onext_edge = cvSubdiv2DNextEdge( edge );
CvSubdiv2DEdge dprev_edge = cvSubdiv2DGetEdge( edge, CV_PREV_AROUND_DST );
int right_of_onext = icvIsRightOf( pt, onext_edge );
int right_of_dprev = icvIsRightOf( pt, dprev_edge );
if( right_of_dprev > 0 )
{
if( right_of_onext > 0 || (right_of_onext == 0 && right_of_curr == 0) )
{
location = CV_PTLOC_INSIDE;
goto exit;
}
else
{
right_of_curr = right_of_onext;
edge = onext_edge;
}
}
else
{
if( right_of_onext > 0 )
{
if( right_of_dprev == 0 && right_of_curr == 0 )
{
location = CV_PTLOC_INSIDE;
goto exit;
}
else
{
right_of_curr = right_of_dprev;
edge = dprev_edge;
}
}
else if( right_of_curr == 0 &&
icvIsRightOf( cvSubdiv2DEdgeDst( onext_edge )->pt, edge ) >= 0 )
{
edge = cvSubdiv2DSymEdge( edge );
}
else
{
right_of_curr = right_of_onext;
edge = onext_edge;
}
}
}
exit:
subdiv->recent_edge = edge;
if( location == CV_PTLOC_INSIDE )
{
double t1, t2, t3;
CvPoint2D32f org_pt = cvSubdiv2DEdgeOrg( edge )->pt;
CvPoint2D32f dst_pt = cvSubdiv2DEdgeDst( edge )->pt;
t1 = fabs( pt.x - org_pt.x );
t1 += fabs( pt.y - org_pt.y );
t2 = fabs( pt.x - dst_pt.x );
t2 += fabs( pt.y - dst_pt.y );
t3 = fabs( org_pt.x - dst_pt.x );
t3 += fabs( org_pt.y - dst_pt.y );
if( t1 < FLT_EPSILON )
{
location = CV_PTLOC_VERTEX;
point = cvSubdiv2DEdgeOrg( edge );
edge = 0;
}
else if( t2 < FLT_EPSILON )
{
location = CV_PTLOC_VERTEX;
point = cvSubdiv2DEdgeDst( edge );
edge = 0;
}
else if( (t1 < t3 || t2 < t3) &&
fabs( cvTriangleArea( pt, org_pt, dst_pt )) < FLT_EPSILON )
{
location = CV_PTLOC_ON_EDGE;
point = 0;
}
}
if( location == CV_PTLOC_ERROR )
{
edge = 0;
point = 0;
}
if( _edge )
*_edge = edge;
if( _point )
*_point = point;
return location;
}
CV_IMPL CvSubdiv2DPointLocation
cvSubdiv2DLocate( CvSubdiv2D * subdiv, CvPoint2D32f pt,
CvSubdiv2DEdge * _edge, CvSubdiv2DPoint ** _point )
{
CvSubdiv2DEdge edge = 0;
CvSubdiv2DPoint *point = 0;
CvSubdiv2DPointLocation location = CV_PTLOC_ERROR;
int i, max_edges;
int right_of_curr = 0;
CV_FUNCNAME( "cvSubdiv2DLocate" );
__BEGIN__;
if( !subdiv )
CV_ERROR( CV_StsNullPtr, "" );
if( !CV_IS_SUBDIV2D(subdiv) )
CV_ERROR_FROM_STATUS( CV_BADFLAG_ERR );
max_edges = subdiv->quad_edges * 4;
edge = subdiv->recent_edge;
if( max_edges == 0 )
CV_ERROR_FROM_STATUS( CV_BADSIZE_ERR );
if( !edge )
CV_ERROR_FROM_STATUS( CV_NOTDEFINED_ERR );
location = CV_PTLOC_OUTSIDE_RECT;
if( pt.x < subdiv->topleft.x || pt.y < subdiv->topleft.y ||
pt.x >= subdiv->bottomright.x || pt.y >= subdiv->bottomright.y )
CV_ERROR_FROM_STATUS( CV_BADRANGE_ERR );
location = CV_PTLOC_ERROR;
right_of_curr = icvIsRightOf( pt, edge );
if( right_of_curr > 0 )
{
edge = cvSubdiv2DSymEdge( edge );
right_of_curr = -right_of_curr;
}
for( i = 0; i < max_edges; i++ )
{
CvSubdiv2DEdge onext_edge = cvSubdiv2DNextEdge( edge );
CvSubdiv2DEdge dprev_edge = cvSubdiv2DGetEdge( edge, CV_PREV_AROUND_DST );
int right_of_onext = icvIsRightOf( pt, onext_edge );
int right_of_dprev = icvIsRightOf( pt, dprev_edge );
if( right_of_dprev > 0 )
{
if( right_of_onext > 0 || right_of_onext == 0 && right_of_curr == 0 )
{
location = CV_PTLOC_INSIDE;
EXIT;
}
else
{
right_of_curr = right_of_onext;
edge = onext_edge;
}
}
else
{
if( right_of_onext > 0 )
{
if( right_of_dprev == 0 && right_of_curr == 0 )
{
location = CV_PTLOC_INSIDE;
EXIT;
}
else
{
right_of_curr = right_of_dprev;
edge = dprev_edge;
}
}
else if( right_of_curr == 0 &&
icvIsRightOf( cvSubdiv2DEdgeDst( onext_edge )->pt, edge ) >= 0 )
{
edge = cvSubdiv2DSymEdge( edge );
}
else
{
right_of_curr = right_of_onext;
edge = onext_edge;
}
}
}
__END__;
subdiv->recent_edge = edge;
if( location == CV_PTLOC_INSIDE )
{
double t1, t2, t3;
CvPoint2D32f org_pt = cvSubdiv2DEdgeOrg( edge )->pt;
CvPoint2D32f dst_pt = cvSubdiv2DEdgeDst( edge )->pt;
t1 = fabs( pt.x - org_pt.x );
t1 += fabs( pt.y - org_pt.y );
t2 = fabs( pt.x - dst_pt.x );
t2 += fabs( pt.y - dst_pt.y );
t3 = fabs( org_pt.x - dst_pt.x );
t3 += fabs( org_pt.y - dst_pt.y );
if( t1 < FLT_EPSILON )
{
location = CV_PTLOC_VERTEX;
point = cvSubdiv2DEdgeOrg( edge );
edge = 0;
}
else if( t2 < FLT_EPSILON )
{
location = CV_PTLOC_VERTEX;
point = cvSubdiv2DEdgeDst( edge );
edge = 0;
}
else if( (t1 < t3 || t2 < t3) &&
fabs( cvTriangleArea( pt, org_pt, dst_pt )) < FLT_EPSILON )
{
location = CV_PTLOC_ON_EDGE;
point = 0;
}
}
if( location == CV_PTLOC_ERROR )
{
edge = 0;
point = 0;
}
if( _edge )
*_edge = edge;
if( _point )
*_point = point;
return location;
}
