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Nikolaj
2021-10-06 17:00:03 +02:00
parent 45f5abaea1
commit 75e47109a6
2 changed files with 19 additions and 14 deletions
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33
A1/coord_query_kdtree.c
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@ -11,6 +11,9 @@
#include "euclidean_distance.h"
#include "coord_query.h"
struct record* closest_point;
double closest_point_distance;
int lon_comp_func(const void* a, const void* b) {
return (
((struct record*)a)->lon - ((struct record*)b)->lon
@ -78,40 +81,42 @@ void free_kdtree(struct node* data) {
free_kdtree(right);
}
struct record* lookup(struct record* closest, double query[2], struct node* tree) {
void lookup(double query[2], struct node* tree) {
if (tree == NULL) {
return closest;
return;
}
double compare_coord[2] = {tree->point[0], tree->point[1]};
double dist = calc_euclidean(query, compare_coord);
double closest_coords[2] = {closest->lon, closest->lat};
double closest_dist = calc_euclidean(query, closest_coords);
if (dist < closest_dist) {
closest = tree->record;
double closest_coords[2] = {closest_point->lon, closest_point->lat};
closest_point_distance = calc_euclidean(query, closest_coords);
if (dist < closest_point_distance) {
closest_point = tree->record;
}
double diff = tree->point[tree->axis] - query[tree->axis];
if (diff >= 0 || closest_dist > fabs(diff)) {
closest = lookup(closest, query, tree->left);
if (diff >= 0 || closest_point_distance > fabs(diff)) {
lookup(query, tree->left);
}
if (diff <= 0 || closest_dist > fabs(diff)) {
closest = lookup(closest, query, tree->right);
if (diff <= 0 || closest_point_distance > fabs(diff)) {
lookup(query, tree->right);
}
return closest;
return;
}
const struct record* lookup_kdtree(struct node *data, double lon, double lat) {
struct record* closest = data->record;
closest_point = data->record;
double query[2] = {lon, lat};
double compare_coord[2] = {data->point[0], data->point[1]};
closest_point_distance = calc_euclidean(query, compare_coord);
closest = lookup(closest, query, data);
lookup(query, data);
return closest;
return closest_point;
}
int main(int argc, char** argv) {