Public Access
twislaandClaude Opus 5.5
463ed2dda8
Position: the Fix line (or how long it has been searching), latitude and longitude in decimal degrees or degrees-minutes-seconds (Settings -> Coordinates), the Maidenhead locator, altitude, speed and course, HDOP and UTC. Sky: the satellites by azimuth and elevation, coloured by constellation, filled when used in the Fix, with used/in-view counts. Tab switches. lib/gnss/geo_format holds the formatting, the locator and the sky projection, host-tested (6 tests; locators checked against FN31pr and JN58td). Verified on the device by a window: 3D Fix from GPS, GLONASS, Galileo and BeiDou. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT
51 lines
2.0 KiB
C++
51 lines
2.0 KiB
C++
#include "geo_format.h"
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#include <cmath>
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#include <cstdio>
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namespace roro::gnss {
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namespace {
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const char* hemisphere(double degrees, bool latitude) {
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return latitude ? (degrees < 0 ? "S" : "N") : (degrees < 0 ? "W" : "E");
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}
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} // namespace
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std::string formatDecimal(double degrees, bool latitude) {
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char buf[32];
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std::snprintf(buf, sizeof buf, "%.5f\xC2\xB0 %s", std::fabs(degrees), hemisphere(degrees, latitude));
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return buf;
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}
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std::string formatDms(double degrees, bool latitude) {
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// Work in tenths of a second, so rounding carries into minutes and degrees.
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long tenths = std::lround(std::fabs(degrees) * 36000.0);
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long d = tenths / 36000, m = tenths / 600 % 60, s10 = tenths % 600;
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char buf[40];
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std::snprintf(buf, sizeof buf, "%ld\xC2\xB0 %02ld' %02ld.%ld\" %s", d, m, s10 / 10, s10 % 10,
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hemisphere(degrees, latitude));
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return buf;
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}
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std::string maidenhead(double latitude, double longitude) {
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double lon = std::fmin(std::fmax(longitude + 180.0, 0.0), 359.999999);
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double lat = std::fmin(std::fmax(latitude + 90.0, 0.0), 179.999999);
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std::string out;
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out += static_cast<char>('A' + static_cast<int>(lon / 20));
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out += static_cast<char>('A' + static_cast<int>(lat / 10));
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out += static_cast<char>('0' + static_cast<int>(std::fmod(lon, 20) / 2));
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out += static_cast<char>('0' + static_cast<int>(std::fmod(lat, 10)));
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out += static_cast<char>('a' + static_cast<int>(std::fmod(lon, 2) * 12));
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out += static_cast<char>('a' + static_cast<int>(std::fmod(lat, 1) * 24));
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return out;
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}
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SkyPoint skyPosition(int azimuthDeg, int elevationDeg, int cx, int cy, int radius) {
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int elevation = elevationDeg < 0 ? 0 : elevationDeg > 90 ? 90 : elevationDeg;
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double r = radius * (90 - elevation) / 90.0;
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double az = azimuthDeg * M_PI / 180.0;
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return {cx + static_cast<int>(std::lround(r * std::sin(az))), cy - static_cast<int>(std::lround(r * std::cos(az)))};
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}
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} // namespace roro::gnss
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