PostGIS  2.3.7dev-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 2279 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().

2280 {
2281  double hside = thep2->x - thep1->x;
2282  double vside = thep2->y - thep1->y;
2283  double dist = sqrt ( hside*hside + vside*vside );
2284 
2285  if (((dl->distance - dist)*(dl->mode))>0) /*multiplication with mode to handle mindistance (mode=1) and maxdistance (mode = (-1)*/
2286  {
2287  dl->distance = dist;
2288 
2289  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*/
2290  {
2291  dl->p1 = *thep1;
2292  dl->p2 = *thep2;
2293  }
2294  else
2295  {
2296  dl->p1 = *thep2;
2297  dl->p2 = *thep1;
2298  }
2299  }
2300  return LW_TRUE;
2301 }
int mode
Definition: measures.h:51
POINT2D p1
Definition: measures.h:49
#define LW_TRUE
Return types for functions with status returns.
Definition: liblwgeom.h:75
POINT2D p2
Definition: measures.h:50
int twisted
Definition: measures.h:52
double distance
Definition: measures.h:48

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