PostGIS  2.5.0dev-r@@SVN_REVISION@@
int lw_dist2d_selected_seg_seg ( const POINT2D A,
const POINT2D B,
const POINT2D C,
const POINT2D D,
DISTPTS dl 
)

This is the same function as lw_dist2d_seg_seg but without any calculations to determine intersection since we already know they do not intersect.

Definition at line 2154 of file measures.c.

References lw_dist2d_pt_seg(), LW_FALSE, LWDEBUGF, DISTPTS::twisted, POINT2D::x, and POINT2D::y.

Referenced by lw_dist2d_pre_seg_seg().

2155 {
2156  LWDEBUGF(2, "lw_dist2d_selected_seg_seg [%g,%g]->[%g,%g] by [%g,%g]->[%g,%g]",
2157  A->x,A->y,B->x,B->y, C->x,C->y, D->x, D->y);
2158 
2159  /*A and B are the same point */
2160  if ( ( A->x == B->x) && (A->y == B->y) )
2161  {
2162  return lw_dist2d_pt_seg(A,C,D,dl);
2163  }
2164  /*U and V are the same point */
2165 
2166  if ( ( C->x == D->x) && (C->y == D->y) )
2167  {
2168  dl->twisted= ((dl->twisted) * (-1));
2169  return lw_dist2d_pt_seg(D,A,B,dl);
2170  }
2171 
2172  if ((lw_dist2d_pt_seg(A,C,D,dl)) && (lw_dist2d_pt_seg(B,C,D,dl)))
2173  {
2174  dl->twisted= ((dl->twisted) * (-1)); /*here we change the order of inputted geometrys and that we notice by changing sign on dl->twisted*/
2175  return ((lw_dist2d_pt_seg(C,A,B,dl)) && (lw_dist2d_pt_seg(D,A,B,dl))); /*if all is successful we return true*/
2176  }
2177  else
2178  {
2179  return LW_FALSE; /* if any of the calls to lw_dist2d_pt_seg goes wrong we return false*/
2180  }
2181 }
double x
Definition: liblwgeom.h:327
#define LW_FALSE
Definition: liblwgeom.h:76
int lw_dist2d_pt_seg(const POINT2D *p, const POINT2D *A, const POINT2D *B, DISTPTS *dl)
lw_dist2d_comp from p to line A->B This one is now sending every occation to lw_dist2d_pt_pt Before i...
Definition: measures.c:2200
double y
Definition: liblwgeom.h:327
int twisted
Definition: measures.h:52
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:88

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