box2df_penalty()

static float box2df_penalty ( const BOX2DF *  b1, const BOX2DF *  b2  )

inlinestatic

Definition at line 1152 of file gserialized_gist_2d.c.

{
        float b1xmin = b1->xmin, b1xmax = b1->xmax;
        float b1ymin = b1->ymin, b1ymax = b1->ymax;
        float b2xmin = b2->xmin, b2xmax = b2->xmax;
        float b2ymin = b2->ymin, b2ymax = b2->ymax;
 
        float box_union_xmin = Min(b1xmin, b2xmin), box_union_xmax = Max(b1xmax, b2xmax);
        float box_union_ymin = Min(b1ymin, b2ymin), box_union_ymax = Max(b1ymax, b2ymax);
 
        float b1dx = b1xmax - b1xmin, b1dy = b1ymax - b1ymin;
        float box_union_dx = box_union_xmax - box_union_xmin, box_union_dy = box_union_ymax - box_union_ymin;
 
        float box_union_area = box_union_dx * box_union_dy, box1area = b1dx * b1dy;
        float box_union_edge = box_union_dx + box_union_dy, box1edge = b1dx + b1dy;
 
        float area_extension = box_union_area - box1area;
        float edge_extension = box_union_edge - box1edge;
 
        /* REALM 1: Area extension is nonzero, return it */
        if (area_extension > FLT_EPSILON)
                return pack_float(area_extension, 1);
        /* REALM 0: Area extension is zero, return nonzero edge extension */
        else if (edge_extension > FLT_EPSILON)
                return pack_float(edge_extension, 0);
 
        return 0;
}

References pack_float().

Referenced by gserialized_gist_penalty_2d(), and gserialized_gist_picksplit_2d().

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