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/*
* Copyright 2018 Uber Technologies, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/** @file vec3d.c
* @brief 3D floating point vector functions.
*/
#include "vec3d.h"
#include <math.h>
/**
* Square of a number
*
* @param x The input number.
* @return The square of the input number.
*/
double _square(double x) { return x * x; }
/**
* Calculate the square of the distance between two 3D coordinates.
*
* @param v1 The first 3D coordinate.
* @param v2 The second 3D coordinate.
* @return The square of the distance between the given points.
*/
double _pointSquareDist(const Vec3d* v1, const Vec3d* v2) {
return _square(v1->x - v2->x) + _square(v1->y - v2->y) +
_square(v1->z - v2->z);
}
/**
* Calculate the 3D coordinate on unit sphere from the latitude and longitude.
*
* @param geo The latitude and longitude of the point.
* @param v The 3D coordinate of the point.
*/
void _geoToVec3d(const GeoCoord* geo, Vec3d* v) {
double r = cos(geo->lat);
v->z = sin(geo->lat);
v->x = cos(geo->lon) * r;
v->y = sin(geo->lon) * r;
}
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