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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "geo_location.h"
using vespalib::geo::ZCurve;
namespace search::common {
namespace {
uint64_t abs_diff(int32_t a, int32_t b) {
return (a > b)
? (int64_t(a) - int64_t(b))
: (int64_t(b) - int64_t(a));
}
ZCurve::BoundingBox to_z(GeoLocation::Box box) {
return ZCurve::BoundingBox(box.x.low, box.x.high,
box.y.low, box.y.high);
}
GeoLocation::Box
adjust_bounding_box(GeoLocation::Box orig, GeoLocation::Point point, uint32_t radius, GeoLocation::Aspect x_aspect)
{
if (radius == GeoLocation::radius_inf) {
// only happens if GeoLocation is explicitly constructed with "infinite" radius
return orig;
}
uint32_t maxdx = radius;
if (x_aspect.active()) {
// x_aspect is a 32-bit fixed-point number in range [0,1]
// so this implements maxdx = ceil(radius/x_aspect)
uint64_t maxdx2 = ((static_cast<uint64_t>(radius) << 32) + 0xffffffffu) / x_aspect.multiplier;
if (maxdx2 >= 0xffffffffu) {
maxdx = 0xffffffffu;
} else {
maxdx = static_cast<uint32_t>(maxdx2);
}
}
// implied limits from radius and point:
int64_t implied_max_x = int64_t(point.x) + int64_t(maxdx);
int64_t implied_min_x = int64_t(point.x) - int64_t(maxdx);
int64_t implied_max_y = int64_t(point.y) + int64_t(radius);
int64_t implied_min_y = int64_t(point.y) - int64_t(radius);
int32_t max_x = orig.x.high;
int32_t min_x = orig.x.low;
int32_t max_y = orig.y.high;
int32_t min_y = orig.y.low;
if (implied_max_x < max_x) max_x = implied_max_x;
if (implied_min_x > min_x) min_x = implied_min_x;
if (implied_max_y < max_y) max_y = implied_max_y;
if (implied_min_y > min_y) min_y = implied_min_y;
return GeoLocation::Box{GeoLocation::Range{min_x, max_x},
GeoLocation::Range{min_y, max_y}};
}
} // namespace <unnamed>
GeoLocation::GeoLocation()
: has_point(false),
point{0, 0},
radius(radius_inf),
x_aspect(),
bounding_box(no_box),
_sq_radius(sq_radius_inf),
_z_bounding_box(to_z(no_box))
{}
GeoLocation::GeoLocation(Point p)
: has_point(true),
point(p),
radius(radius_inf),
x_aspect(),
bounding_box(no_box),
_sq_radius(sq_radius_inf),
_z_bounding_box(to_z(no_box))
{}
GeoLocation::GeoLocation(Point p, Aspect xa)
: has_point(true),
point(p),
radius(radius_inf),
x_aspect(xa),
bounding_box(no_box),
_sq_radius(sq_radius_inf),
_z_bounding_box(to_z(no_box))
{}
GeoLocation::GeoLocation(Point p, uint32_t r)
: has_point(true),
point(p),
radius(r),
x_aspect(),
bounding_box(adjust_bounding_box(no_box, p, r, Aspect())),
_sq_radius(uint64_t(r) * uint64_t(r)),
_z_bounding_box(to_z(bounding_box))
{}
GeoLocation::GeoLocation(Point p, uint32_t r, Aspect xa)
: has_point(true),
point(p),
radius(r),
x_aspect(xa),
bounding_box(adjust_bounding_box(no_box, p, r, xa)),
_sq_radius(uint64_t(r) * uint64_t(r)),
_z_bounding_box(to_z(bounding_box))
{}
GeoLocation::GeoLocation(Box b)
: has_point(false),
point{0, 0},
radius(radius_inf),
x_aspect(),
bounding_box(b),
_sq_radius(sq_radius_inf),
_z_bounding_box(to_z(bounding_box))
{}
GeoLocation::GeoLocation(Box b, Point p)
: has_point(true),
point(p),
radius(radius_inf),
x_aspect(),
bounding_box(b),
_sq_radius(sq_radius_inf),
_z_bounding_box(to_z(bounding_box))
{}
GeoLocation::GeoLocation(Box b, Point p, Aspect xa)
: has_point(true),
point(p),
radius(radius_inf),
x_aspect(xa),
bounding_box(b),
_sq_radius(sq_radius_inf),
_z_bounding_box(to_z(bounding_box))
{}
GeoLocation::GeoLocation(Box b, Point p, uint32_t r)
: has_point(true),
point(p),
radius(r),
x_aspect(),
bounding_box(adjust_bounding_box(b, p, r, Aspect())),
_sq_radius(uint64_t(r) * uint64_t(r)),
_z_bounding_box(to_z(bounding_box))
{}
GeoLocation::GeoLocation(Box b, Point p, uint32_t r, Aspect xa)
: has_point(true),
point(p),
radius(r),
x_aspect(xa),
bounding_box(adjust_bounding_box(b, p, r, xa)),
_sq_radius(uint64_t(r) * uint64_t(r)),
_z_bounding_box(to_z(bounding_box))
{}
uint64_t GeoLocation::sq_distance_to(Point p) const {
if (has_point) {
uint64_t dx = abs_diff(p.x, point.x);
if (x_aspect.active()) {
// x_aspect is a 32-bit fixed-point number in range [0,1]
// this implements dx = (dx * x_aspect)
dx = (dx * x_aspect.multiplier) >> 32;
}
uint64_t dy = abs_diff(p.y, point.y);
return dx*dx + dy*dy;
}
return 0;
}
bool GeoLocation::inside_limit(Point p) const {
if (p.x < bounding_box.x.low) return false;
if (p.x > bounding_box.x.high) return false;
if (p.y < bounding_box.y.low) return false;
if (p.y > bounding_box.y.high) return false;
uint64_t sq_dist = sq_distance_to(p);
return sq_dist <= _sq_radius;
}
} // namespace search::common
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