# geohash

**Repository Path**: wblong/geohash

## Basic Information

- **Project Name**: geohash
- **Description**: Geohash library for cplusplus.
- **Primary Language**: C++
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 1
- **Forks**: 0
- **Created**: 2021-10-29
- **Last Updated**: 2023-09-10

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# GeoHash

Geohash library for cplusplus.


## Basic Methods

```cpp
#include <catch2/catch.hpp>
#include "cgeohash.hpp"

size_t precision = 12;
double longitude = 112.5584;
double latitude = 37.8324;
GeoHash::string_type geostr("ww8p1r4t8");
GeoHash::string_type geo_neighbor("dqcjq");

TEST_CASE("Test geohash encode & decode method") {

    SECTION("Test geohash encode method") {
        GeoHash::string_type out;
        GeoHash::encode(latitude, longitude, 9, out);
        REQUIRE(geostr == out);
    }
}

TEST_CASE("Test geohash decode method") {
    GeoHash::DecodedHash out = GeoHash::decode(geostr);
    //var diff = Math.abs(latitude - actual) < 0.0001
    REQUIRE(abs(latitude - out.latitude) <= out.latitude_err);
    REQUIRE(abs(longitude - out.longitude) <= out.longitude_err);
}

TEST_CASE("Test geohash neighbor method:finds neighbor to the north") {
    const int dir[2] = { 1,0 };
    GeoHash::string_type actual = GeoHash::neighbor(geo_neighbor, dir);
    GeoHash::string_type expected("dqcjw");
    REQUIRE(actual == expected);
}

TEST_CASE("Test geohash neighbor method:finds neighbor to the south-west") {
    const int dir[2] = { -1,-1 };
    GeoHash::string_type actual = GeoHash::neighbor(geo_neighbor, dir);
    GeoHash::string_type expected("dqcjj");
    REQUIRE(actual == expected);
}

TEST_CASE("Test decodes string to bounded box") {

    GeoHash::DecodedBBox box= GeoHash::decode_bbox(geostr);
    //[37.83236503601074,112.55836486816406,37.83240795135498,112.5584077835083];
    REQUIRE((latitude>=box.minlat && latitude <= box.maxlat));
    REQUIRE((longitude>=box.minlon && longitude<=box.maxlon));
}
```

## Reference

1. [https://github.com/sunng87/node-geohash.git](https://github.com/sunng87/node-geohash.git)
2. [https://github.com/gnagel/node-geohash-cpp.git](https://github.com/gnagel/node-geohash-cpp.git)