BOOL MoveToEx(

    HDC hdc,          // 设备环境句柄

    int X,            // 要移动到的 x 坐标

    int Y,            // 要移动到的 y 坐标

    LPPOINT lpPoint   // 之前的位置（POINT 结构地址）

);

BOOL LineTo(

    HDC hdc,    // 设备环境句柄

    int nXEnd,  // 结束位置的 x 坐标

    int nYEnd   // 结束位置的 y 坐标

);

BOOL Polyline(

    HDC hdc,            // 设备环境句柄

    CONST POINT *lppt,  // POINT 结构数组（一系列点）

    int cPoints         // POINT 结构的数量（点的数量）

);

BOOL PolylineTo(

    HDC hdc,            // 设备环境句柄

    CONST POINT *lppt,  // POINT 结构数组（一系列点）

    DWORD cCount        // POINT 结构的数量（点的数量）

);

BOOL PolyPolyline(

    HDC hdc,                      // 设备环境句柄

    CONST POINT *lppt,            // POINT 结构数组（一系列点）

    CONST DWORD *lpdwPolyPoints,  // 数组中的每个元素表示对应折线的点的数量

    DWORD cCount                  // 折线数量（上个参数的元素个数）

);

#include <windows.h>

#include <strsafe.h>

#include <math.h>

#define NUMS 10000

#define TWOPI 6.283185307

LRESULT CALLBACK WindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {

    HDC hdc;

    PAINTSTRUCT ps;

    RECT rcClient;

    POINT apt[NUMS];

    TCHAR szBuffer[100];

    size_t nLength;

    int cxClient, cyClient, i;

    switch (message) {

    case WM_PAINT:

        hdc = BeginPaint(hwnd, &ps);

        GetClientRect(hwnd, &rcClient);

        cxClient = rcClient.right - rcClient.left;

        cyClient = rcClient.bottom - rcClient.top;

        MoveToEx(hdc, 0, cyClient / 2, NULL);

        LineTo(hdc, cxClient, cyClient / 2);

        for (i = 0; i < NUMS; i++) {

            apt[i].x = i;

            apt[i].y = (int)((1 - sin(i * TWOPI / cxClient)) * cyClient / 2);

        }

        SetTextAlign(hdc, TA_TOP | TA_RIGHT);

        StringCchPrintf(szBuffer, sizeof(szBuffer) / sizeof(TCHAR), TEXT("y = sin x"));

        StringCchLength(szBuffer, sizeof(szBuffer) / sizeof(TCHAR), &nLength);

        TextOut(hdc, cxClient - 10, 10, szBuffer, nLength);

        Polyline(hdc, apt, i - 1);

        EndPaint(hwnd, &ps);

        return 0;

    case WM_DESTROY:

        PostQuitMessage(0);

        return 0;

    }

    return DefWindowProc(hwnd, message, wParam, lParam);

}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {

    LPCTSTR lpszClassName = TEXT("Demo");

    LPCTSTR lpszWindowName = TEXT("Demo Program");

    WNDCLASS wndclass;

    wndclass.cbClsExtra = 0;

    wndclass.cbWndExtra = 0;

    wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);

    wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);

    wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);

    wndclass.hInstance = hInstance;

    wndclass.lpfnWndProc = WindowProc;

    wndclass.lpszClassName = lpszClassName;

    wndclass.lpszMenuName = NULL;

    wndclass.style = CS_HREDRAW | CS_VREDRAW;

    if (!RegisterClass(&wndclass)) {

        MessageBox(NULL, TEXT("This program requires Windows NT!"), lpszWindowName, MB_ICONERROR);

        return 0;

    }

    HWND hwnd = CreateWindow(

        lpszClassName,

        lpszWindowName,

        WS_OVERLAPPEDWINDOW,

        CW_USEDEFAULT,

        CW_USEDEFAULT,

        CW_USEDEFAULT,

        CW_USEDEFAULT,

        NULL,

        NULL,

        hInstance,

        NULL

    );

    ShowWindow(hwnd, nCmdShow);

    UpdateWindow(hwnd);

    MSG msg;

    while (GetMessage(&msg, NULL, 0, 0)) {

        TranslateMessage(&msg);

        DispatchMessage(&msg);

    }

    return msg.wParam;

}