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117 lines
3.6 KiB
C
117 lines
3.6 KiB
C
#include "maidenhead.h"
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#include <math.h>
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#include <stdio.h>
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#include <string.h>
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/*
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This is from https://github.com/sp6q/maidenhead
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MIT License
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Copyright (c) 2021 Mateusz Salwach
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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char letterize(int x)
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{
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return (char)x + 65;
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}
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char *get_mh(double lat, double lon, int size)
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{
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static char locator[11];
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double LON_F[] = {20, 2.0, 0.083333, 0.008333, 0.0003472083333333333};
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double LAT_F[] = {10, 1.0, 0.0416665, 0.004166, 0.0001735833333333333};
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int i;
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lon += 180;
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lat += 90;
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if (size <= 0 || size > 10)
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size = 6;
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size /= 2;
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size *= 2;
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for (i = 0; i < size / 2; i++)
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{
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if (i % 2 == 1)
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{
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locator[i * 2] = (char)(lon / LON_F[i] + '0');
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locator[i * 2 + 1] = (char)(lat / LAT_F[i] + '0');
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}
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else
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{
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locator[i * 2] = letterize((int)(lon / LON_F[i]));
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locator[i * 2 + 1] = letterize((int)(lat / LAT_F[i]));
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}
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lon = fmod(lon, LON_F[i]);
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lat = fmod(lat, LAT_F[i]);
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}
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locator[i * 2] = 0;
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return locator;
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}
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char *complete_mh(char *locator)
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{
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static char locator2[11] = "LL55LL55LL";
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int len = strlen(locator);
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if (len >= 10)
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return locator;
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memcpy(locator2, locator, strlen(locator));
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return locator2;
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}
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double mh2lon(char *locator)
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{
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double field, square, subsquare, extsquare, precsquare;
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int len = strlen(locator);
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if (len > 10)
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return 0;
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if (len < 10)
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locator = complete_mh(locator);
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field = (locator[0] - 'A') * 20.0;
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square = (locator[2] - '0') * 2.0;
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subsquare = (locator[4] - 'A') / 12.0;
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extsquare = (locator[6] - '0') / 120.0;
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precsquare = (locator[8] - 'A') / 2880.0;
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return field + square + subsquare + extsquare + precsquare - 180;
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}
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double mh2lat(char *locator)
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{
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double field, square, subsquare, extsquare, precsquare;
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int len = strlen(locator);
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if (len > 10)
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return 0;
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if (len < 10)
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locator = complete_mh(locator);
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field = (locator[1] - 'A') * 10.0;
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square = (locator[3] - '0') * 1.0;
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subsquare = (locator[5] - 'A') / 24.0;
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extsquare = (locator[7] - '0') / 240.0;
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precsquare = (locator[9] - 'A') / 5760.0;
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return field + square + subsquare + extsquare + precsquare - 90;
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}
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#ifdef __cplusplus
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}
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#endif
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