_HSB_to_RGB (.DLL)

//Файл Test.cpp

//Включаем заголовочный файл "windows.h" в проект.
#include "windows.h"

//Определяем идентификатор для экспорта функций.
#define EXPORT __declspec(dllexport)

//Точка входа в динамически-подключаемую библиотеку (DLL).
BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
    switch (ul_reason_for_call)
    {
        case DLL_PROCESS_ATTACH:
            break;
        case DLL_THREAD_ATTACH:
            break;
        case DLL_THREAD_DETACH:
            break;
        case DLL_PROCESS_DETACH:
            break;
    }
    return TRUE;
}

//Функция _HSB_to_RGB.
EXPORT int __stdcall _HSB_to_RGB(double nH, double nS, double nL, int iScale1, int iScale2, int iScale3)
{
    double nR = 0;
    double nG = 0;
    double nB = 0;
    int Sector = 0;
    double f = 0;
    double p = 0;
    double q = 0;
    double t = 0;

    nL /= iScale3;

    if (nS = 0)
        {
            nR = nL;
            nG = nR;
            nB = nR;
        }
    else
        {
            while (nH >= iScale1) {nH -= iScale1;}

            nS /= iScale2;
            nH /= iScale1 / 6;
            Sector = (int) nH; // так как тип переменной int, то атоматическое приведение

            f = nH - (double) Sector;
            p = nL * (1 - nS);
            q = nL * (1 - nS * f);
            t = nL * (1 - nS * (1 - f));
            switch (Sector)
                {
                    case 0:
                        nR = nL;
                        nG = t;
                        nB = p;
                        break;
                    case 1:
                        nR = q;
                        nG = nL;
                        nB = p;
                        break;
                    case 2:
                        nR = p;
                        nG = nL;
                        nB = t;
                        break;
                    case 3:
                        nR = p;
                        nG = q;
                        nB = nL;
                        break;
                    case 4:
                        nR = t;
                        nG = p;
                        nB = nL;
                        break;
                    default:
                        nR = nL;
                        nG = p;
                        nB = q;
                }
            nR *= 255;
            nG *= 255;
            nB *= 255;
        }
    return nR;
}