draw aircraft

src/core/const.hpp

@@ -4,3 +4,4 @@ constexpr char* user_agent = "p-rad/0.1";
 
 
 
+#define ARRAY_LENGHT(arr) sizeof(arr) / sizeof(arr[0])

src/core/geo.cpp

@@ -0,0 +1,16 @@
+#include <GeographicLib/Geodesic.hpp>
+#include <cmath>
+#include <tuple>
+#include "global.hpp"
+std::tuple<float, float> get_offset_from_station(double lat, double lon) {
+  const GeographicLib::Geodesic &geod = GeographicLib::Geodesic::WGS84();
+
+  double distance, azi1, azi2;
+  geod.Inverse(receiver_lat, receiver_lon, lat, lon, distance, azi1,
+               azi2);
+
+  double azi_rad = azi1 * M_PI / 180.0;
+
+
+  return {static_cast<float>(distance * std::sin(azi_rad)),static_cast<float>(-distance * std::cos(azi_rad))};
+}

src/core/geo.hpp

@@ -0,0 +1,3 @@
+#pragma once 
+#include <tuple>
+std::tuple<float, float> get_offset_from_station(double lat, double lon);

src/core/global.cpp

@@ -0,0 +1,2 @@
+  float receiver_lat;
+  float receiver_lon;

src/core/global.hpp

@@ -0,0 +1,3 @@
+#pragma once
+extern float receiver_lat;
+extern float receiver_lon;