C语言画会跳动的爱心

下面是一个使用C语言绘制跳动的爱心的示例代码。该代码使用了Windows API中的绘图函数，需要在Windows环境中运行。

#include <windows.h>

#define PI 3.14159265358979323846

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    static TCHAR szAppName[] = TEXT("Heart");
    HWND hwnd;
    MSG msg;
    WNDCLASS wndclass;

    wndclass.style = CS_HREDRAW | CS_VREDRAW;
    wndclass.lpfnWndProc = WndProc;
    wndclass.cbClsExtra = 0;
    wndclass.cbWndExtra = 0;
    wndclass.hInstance = hInstance;
    wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
    wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    wndclass.lpszMenuName = NULL;
    wndclass.lpszClassName = szAppName;

    if (!RegisterClass(&wndclass)) {
        MessageBox(NULL, TEXT("This program requires Windows NT!"), szAppName, MB_ICONERROR);
        return 0;
    }

    hwnd = CreateWindow(szAppName, TEXT("Heart"), WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
        NULL, NULL, hInstance, NULL);

    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

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

    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    static int cxClient, cyClient;
    static int cxHeart, cyHeart;
    static int iAngle;
    HDC hdc;
    PAINTSTRUCT ps;
    POINT apt[13] = {
        {0, -3}, {1, -4}, {2, -4}, {3, -3},
        {4, -2}, {4, -1}, {3, 0}, {2, 1},
        {1, 2}, {0, 3}, {-1, 2}, {-2, 1},
        {-3, 0}
    };

    switch (msg) {
    case WM_CREATE:
        cxHeart = 40;
        cyHeart = 40;
        SetTimer(hwnd, 1, 50, NULL);
        return 0;

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

    case WM_TIMER:
        iAngle += 5;
        if (iAngle >= 360) {
            iAngle = 0;
        }
        InvalidateRect(hwnd, NULL, TRUE);
        return 0;

    case WM_PAINT:
        hdc = BeginPaint(hwnd, &ps);

        SelectObject(hdc, GetStockObject(NULL_BRUSH));
        SelectObject(hdc, GetStockObject(BLACK_PEN));

        SetViewportOrgEx(hdc, cxClient / 2, cyClient / 2, NULL);
        SetWindowExtEx(hdc, 100, 100, NULL);
        SetViewportExtEx(hdc, cxClient, -cyClient, NULL);

        MoveToEx(hdc, cxHeart * cos((iAngle - 15) * PI / 180),
            cyHeart * sin((iAngle - 15) * PI / 180), NULL);

        LineTo(hdc, cxHeart * cos(iAngle * PI / 180),
            cyHeart * sin(iAngle * PI / 180));

        PolylineTo(hdc, apt, sizeof(apt) / sizeof(apt[0]));

        LineTo(hdc, cxHeart * cos((iAngle + 15) * PI / 180),
            cyHeart * sin((iAngle + 15) * PI / 180));

        EndPaint(hwnd, &ps);
        return 0;

    case WM_DESTROY:
        KillTimer(hwnd, 1);
        PostQuitMessage(0);
        return 0;
    }

    return DefWindowProc(hwnd, msg, wParam, lParam);
}

该代码会在窗口中绘制跳动的爱心，可以通过定时器来实现爱心跳动的效果。