PostGIS  2.2.7dev-r@@SVN_REVISION@@
int lw_dist2d_pt_pt ( const POINT2D P,
const POINT2D Q,
DISTPTS dl 
)

Compares incomming points and stores the points closest to each other or most far away from each other depending on dl->mode (max or min)

Definition at line 2265 of file measures.c.

References DISTPTS::distance, LW_TRUE, DISTPTS::mode, DISTPTS::p1, DISTPTS::p2, DISTPTS::twisted, POINT2D::x, and POINT2D::y.

Referenced by lw_dist2d_arc_arc(), lw_dist2d_point_point(), lw_dist2d_pre_seg_seg(), lw_dist2d_pt_arc(), lw_dist2d_pt_ptarray(), lw_dist2d_pt_ptarrayarc(), lw_dist2d_pt_seg(), lw_dist2d_ptarray_ptarray(), and lw_dist2d_seg_arc().

2266 {
2267  double hside = thep2->x - thep1->x;
2268  double vside = thep2->y - thep1->y;
2269  double dist = sqrt ( hside*hside + vside*vside );
2270 
2271  if (((dl->distance - dist)*(dl->mode))>0) /*multiplication with mode to handle mindistance (mode=1) and maxdistance (mode = (-1)*/
2272  {
2273  dl->distance = dist;
2274 
2275  if (dl->twisted>0) /*To get the points in right order. twisted is updated between 1 and (-1) every time the order is changed earlier in the chain*/
2276  {
2277  dl->p1 = *thep1;
2278  dl->p2 = *thep2;
2279  }
2280  else
2281  {
2282  dl->p1 = *thep2;
2283  dl->p2 = *thep1;
2284  }
2285  }
2286  return LW_TRUE;
2287 }
int mode
Definition: measures.h:27
POINT2D p1
Definition: measures.h:25
#define LW_TRUE
Return types for functions with status returns.
Definition: liblwgeom.h:61
POINT2D p2
Definition: measures.h:26
int twisted
Definition: measures.h:28
double distance
Definition: measures.h:24

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