PostGIS  2.1.10dev-r@@SVN_REVISION@@
static double box2df_distance_leaf_centroid ( const BOX2DF *  a,
const BOX2DF *  b 
)
static

Calculate the centroid->centroid distance between the boxes.

We return the square distance to avoid a call to sqrt.

Definition at line 380 of file gserialized_gist_2d.c.

Referenced by gserialized_distance_centroid_2d(), and gserialized_gist_distance_2d().

381 {
382  /* The centroid->centroid distance between the boxes */
383  double a_x = (a->xmax + a->xmin) / 2.0;
384  double a_y = (a->ymax + a->ymin) / 2.0;
385  double b_x = (b->xmax + b->xmin) / 2.0;
386  double b_y = (b->ymax + b->ymin) / 2.0;
387 
388  /* This "distance" is only used for comparisons, */
389  /* so for speed we drop contants and skip the sqrt step. */
390  return sqrt((a_x - b_x) * (a_x - b_x) + (a_y - b_y) * (a_y - b_y));
391 }

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