PostGIS  2.2.7dev-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 2143 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().

2144 {
2145  LWDEBUGF(2, "lw_dist2d_selected_seg_seg [%g,%g]->[%g,%g] by [%g,%g]->[%g,%g]",
2146  A->x,A->y,B->x,B->y, C->x,C->y, D->x, D->y);
2147 
2148  /*A and B are the same point */
2149  if ( ( A->x == B->x) && (A->y == B->y) )
2150  {
2151  return lw_dist2d_pt_seg(A,C,D,dl);
2152  }
2153  /*U and V are the same point */
2154 
2155  if ( ( C->x == D->x) && (C->y == D->y) )
2156  {
2157  dl->twisted= ((dl->twisted) * (-1));
2158  return lw_dist2d_pt_seg(D,A,B,dl);
2159  }
2160 
2161  if ((lw_dist2d_pt_seg(A,C,D,dl)) && (lw_dist2d_pt_seg(B,C,D,dl)))
2162  {
2163  dl->twisted= ((dl->twisted) * (-1)); /*here we change the order of inputted geometrys and that we notice by changing sign on dl->twisted*/
2164  return ((lw_dist2d_pt_seg(C,A,B,dl)) && (lw_dist2d_pt_seg(D,A,B,dl))); /*if all is successful we return true*/
2165  }
2166  else
2167  {
2168  return LW_FALSE; /* if any of the calls to lw_dist2d_pt_seg goes wrong we return false*/
2169  }
2170 }
double x
Definition: liblwgeom.h:312
#define LW_FALSE
Definition: liblwgeom.h:62
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:2189
double y
Definition: liblwgeom.h:312
int twisted
Definition: measures.h:28
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:55

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