#include <iostream>
#include <windows.h>
#include <cmath>

// Определение размеров окна
const int WIDTH = 800;
const int HEIGHT = 600;

// Определение параметров синусоид
const double PI = 3.14159265358979323846;
const double X_SCALE = 0.01;  
const double Y_SCALE = 100.0; // Машт по Y

// Основная функция для рисования синусоид
void DrawSineWaves(HDC hdc) {
    int centerY = HEIGHT / 2;

    // Рисование синусоид
    for (double x = 0; x < WIDTH; x += 0.5) { 
        double xVal = x * X_SCALE;

        
        int ySmall2 = static_cast<int>(0.3 * std::sin(7 * xVal) * Y_SCALE);
        SetPixel(hdc, static_cast<int>(x), centerY - ySmall2, RGB(255, 204, 0)); 

    }
}

// Оконная процедура
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
    switch (uMsg) {
    case WM_PAINT: {
        PAINTSTRUCT ps;
        HDC hdc = BeginPaint(hwnd, &ps);
        DrawSineWaves(hdc);
        EndPaint(hwnd, &ps);
    }
                 return 0;

    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }
    return DefWindowProc(hwnd, uMsg, wParam, lParam);
}

// Основная функция WinAPI
int WINAPI wWinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_ PWSTR pCmdLine, _In_ int nCmdShow) {
    const wchar_t CLASS_NAME[] = L"SineWaveWindowClass";

    WNDCLASS wc = {};
    wc.lpfnWndProc = WindowProc;
    wc.hInstance = hInstance;
    wc.lpszClassName = CLASS_NAME;
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);

    RegisterClass(&wc);

    HWND hwnd = CreateWindowEx(
        0,
        CLASS_NAME,
        L"Sine Waves Graph",
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT, WIDTH, HEIGHT,
        nullptr,
        nullptr,
        hInstance,
        nullptr
    );

    if (hwnd == nullptr) {
        return 0;
    }

    ShowWindow(hwnd, nCmdShow);

    MSG msg;
    while (GetMessage(&msg, nullptr, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return 0;
}