Windows控制cpu正弦曲线代码c语言

以下是一个简单的 Windows 控制 CPU 正弦曲线的 C 代码：

#include <Windows.h>
#include <math.h>

#define PI 3.14159265358979323846

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine, int nCmdShow)
{
    MSG msg;
    WNDCLASS wc = { 0 };
    wc.lpfnWndProc = WndProc;
    wc.hInstance = hInstance;
    wc.hbrBackground = (HBRUSH)(COLOR_BACKGROUND);
    wc.lpszClassName = TEXT("CPU Sinusoid");

    if (!RegisterClass(&wc))
        return 1;

    HWND hWnd = CreateWindow(TEXT("CPU Sinusoid"), TEXT("CPU Sinusoid"),
                             WS_OVERLAPPEDWINDOW | WS_VISIBLE,
                             CW_USEDEFAULT, CW_USEDEFAULT,
                             640, 480,
                             NULL, NULL, hInstance, NULL);

    if (!hWnd)
        return 2;

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

    return (int)msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    static int cxClient, cyClient;
    static int iPosX = 0, iPosY = 0;
    static double dTheta = 0.0;

    switch (message)
    {
    case WM_SIZE:
        cxClient = LOWORD(lParam);
        cyClient = HIWORD(lParam);
        return 0;

    case WM_PAINT:
    {
        PAINTSTRUCT ps;
        HDC hdc = BeginPaint(hWnd, &ps);

        // 计算正弦曲线的值
        int iMaxX = cxClient - 1;
        int iMaxY = cyClient - 1;
        int iX = iPosX;
        int iY = iPosY;
        for (int i = 0; i < iMaxX; i++)
        {
            double dSin = sin(dTheta);
            iY = (int)(iMaxY * (1.0 - dSin) / 2.0);
            MoveToEx(hdc, iX, iY, NULL);
            dTheta += 0.01;
            if (dTheta > 2 * PI)
                dTheta -= 2 * PI;
            iX++;
            if (iX > iMaxX)
                break;
            dSin = sin(dTheta);
            iY = (int)(iMaxY * (1.0 - dSin) / 2.0);
            LineTo(hdc, iX, iY);
        }

        EndPaint(hWnd, &ps);
        return 0;
    }

    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;

    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
}

这个程序创建了一个窗口，然后在窗口中绘制一个 CPU 正弦曲线。每次绘制时，都会计算当前正弦曲线的值，并在窗口中绘制一条线段。曲线的周期是 2π，可以通过修改 `dTheta` 的增量来改变周期。