Кибор и C/C++

#include "pch.h"
#include <cmath>

#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif

extern "C" {
__declspec(dllexport) int get_direction(double x_start, double y_start, double x_end, double y_end) {
// Convert from isometric coordinates to 2D coordinates
double x_start_2d = x_start - y_start;
double y_start_2d = (x_start + y_start) / 2;
double x_end_2d = x_end - y_end;
double y_end_2d = (x_end + y_end) / 2;

// Compute the direction vector in 2D space
double dx = x_end_2d - x_start_2d;
double dy = y_end_2d - y_start_2d;

// Compute the angle of the direction vector in degrees using C Standard Library's atan2
double angle = atan2(dy, dx) * 180.0 / M_PI;

// Convert the result to int before returning
return static_cast<int>(angle);
}
}

external(INT, "get_direction", "get_direction", "Dll.dll");

int result = get_direction(111, 111, 333, 333);

messagebox(result);