烟花

请使用WinAPI方式实现烟花效果

//windows.h文件中包含应用程序中所需的数据类型和数据结构的定义
#include <windows.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <stdio.h>
#include <math.h>
#define PI acos(-1)
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);//窗口函数说明
//---------以下初始化窗口类--------------
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInst,LPSTR lpszCmdLine,int nCmdShow)
{
    HWND hwnd;
    MSG Msg;
    WNDCLASS wndclass;
    char lpszClassName[] = "窗口";     //窗口类名
    char lpszTitle[] = "My_Windows";    //窗口标题名

    //窗口类的定义
    wndclass.style = CS_HREDRAW | CS_VREDRAW;                  //窗口类型为默认类型
    wndclass.lpfnWndProc = WndProc;      //窗口处理函数为WndProc
    wndclass.cbClsExtra = 0;             //窗口类无扩展
    wndclass.cbWndExtra = 0;             //窗口实例无扩展
    wndclass.hInstance = hInstance;     //当前实例句柄

    wndclass.hIcon = LoadIcon(NULL,IDI_APPLICATION);//窗口的最小化图标为默认图标
    wndclass.hCursor = LoadCursor( NULL, IDC_ARROW); //窗口 采用箭头光标
    wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); //窗口 背景为 白色
    wndclass.lpszMenuName = NULL ; //窗口 中无菜单
    wndclass.lpszClassName = lpszClassName; //窗口类名为“窗口示例”
//-----------以下进行窗口类的注册
    if (!RegisterClass(&wndclass))//如果注册失败则发出警吿声音
    {
        MessageBeep (0);
        return FALSE;
    }

//创建窗口
    hwnd = CreateWindow(
                        lpszClassName, //窗口类名
                        lpszTitle,      //窗口实例的标题名
                        WS_OVERLAPPEDWINDOW, //窗口 的风格
                        CW_USEDEFAULT,
                        CW_USEDEFAULT,  //窗口左上角坐标为默认值
                        CW_USEDEFAULT,
                        CW_USEDEFAULT,  //窗口的髙和宽为默认值
                        NULL,           //此窗口无父窗口
                        NULL,           //此窗口无主菜单
                        hInstance,      //创建此窗口应用程序的当前句柄
                        NULL            //不使用该值
                        );



    ShowWindow( hwnd, nCmdShow);        //显示窗口
    UpdateWindow(hwnd);                 //绘制用户区
    while( GetMessage(&Msg, NULL, 0, 0)) //消息循环
    {
        TranslateMessage(&Msg);
        DispatchMessage(&Msg);
    }
    return Msg.wParam;                  //程序终止时将信息返回系统
}
//定义烟花结构体
struct Fworks
{
    COLORREF colr;
    int i;
    int delay;
    POINT p[18];
    int a[18];
    POINT init;

};
//初始化每个烟花
static Fworks fw[10] = {{RGB(255,255,255), 0, rand()%100}, {RGB(0,255,0), 0, rand()%100},{RGB(255,255,0), 0, rand()%100},{RGB(0,0,255), 0, rand()%100},{RGB(255,0,255), 0, rand()%100},
 {RGB(55,21,255), 0, rand()%100}, {RGB(0,125,125), 0, rand()%100},{RGB(125,255,0), 0, rand()%100},{RGB(0,125,255), 0, rand()%100},{RGB(255,125,255), 0, rand()%100}} ;

 //画烟花
int Create_Firework(HDC hDC, int num, RECT rect)
{
    HPEN hP = CreatePen(PS_SOLID, 1, fw[num].colr);
    SelectObject(hDC, hP);
    int flag = 0;
    if (fw[num].i == 200)
    {
        if (fw[num].a[0] == 0)
            for (int i = 0; i < 18; i++)
                fw[num].p[i].x = fw[num].init.x, fw[num].p[i].y = fw[num].init.y-fw[num].i;
        for (int i = 0; i < 18; i++)
        {
            MoveToEx(hDC, fw[num].p[i].x, fw[num].p[i].y, NULL);
            fw[num].p[i].x += 10*cos(360*i*PI/18/180), fw[num].p[i].y += 10*sin(360*i*PI/180/18);
            LineTo(hDC, fw[num].p[i].x ,  fw[num].p[i].y);
            fw[num].a[i] += 10;
        }
        if (fw[num].a[0] == 100)
        {
            fw[num].i = 0;
            for (int j = 0; j < 18; j++)
                fw[num].a[j] = 0;
            fw[num].init.x = rand() % rect.right ;
            fw[num].init.y = rand() % rect.bottom+200;
            flag = 1;

        }

    }
    else
    {
        MoveToEx(hDC, fw[num].init.x, fw[num].init.y-fw[num].i, NULL);
        LineTo(hDC, fw[num].init.x, fw[num].init.y-fw[num].i+20);
        //printf("%d\n", fw[num].i);
        fw[num].i += 20;
    }

    DeleteObject(hP);
    if (flag)
        return 1;
    return 0;
}

//窗口函数
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    HDC hDC, hdc_old;
    HBITMAP hBmp;
    RECT rect;
    HBRUSH hBrush;
    PAINTSTRUCT Ps;
    TEXTMETRIC tm;
    HFONT hf;
    HPEN hPen;
    SIZE Sz;
    COLORREF color[7] = {RGB(255,0,0), RGB(255,165,0), RGB(255,255,0), RGB(0,255,0), RGB(0,255,255), RGB(0,0,255), RGB(139,0,255)};
    static int cnt = 50;
    int temp;
    HBITMAP hBkBmp;
    int i;

    switch (message)
    {
    case WM_CREATE:
        //建立计时器，每0.05秒发出wm_timer的消息
        SetTimer(hWnd, 1, 40, NULL);
        srand(time(NULL));
        return 0;
    case WM_ERASEBKGND:
        return 1;
    case WM_PAINT:
　　　　//用双缓冲方式，使动图更加顺滑
        hdc_old = BeginPaint(hWnd, &Ps);
        hDC = CreateCompatibleDC(hdc_old);
        GetClientRect(hWnd,&rect);
        hBmp = CreateCompatibleBitmap(hdc_old,rect.right,rect.bottom);
        SelectObject(hDC,hBmp);


        //设置背景渐变色
        for (i = 0; i < rect.bottom; i++)
        {
            hPen = CreatePen(PS_SOLID, 1, RGB(0,16-16*i/rect.bottom,97-97*i/rect.bottom));
            SelectObject(hDC, hPen);
            Rectangle(hDC, rect.left, rect.top+i,rect.right,rect.top+1+i);
            DeleteObject(hPen);
        }


        for (i = 0; i < 10; i++)
        {
            if (fw[i].delay < cnt)
                Create_Firework(hDC , i, rect);
        }
        if (cnt <= 100)
            cnt++;
        //if (cnt)

        BitBlt(hdc_old,0,0,rect.right,rect.bottom,hDC,0,0,SRCCOPY);
        DeleteObject(hBmp);
        DeleteDC(hDC);
        ReleaseDC(hWnd, hDC); //释放
        EndPaint(hWnd, &Ps); //结束缓制
        return 0;


    case WM_TIMER:
        InvalidateRect(hWnd, NULL, 1);
        return 0;
    case WM_DESTROY:
        PostQuitMessage(0);                 //调用 PostQuitMessage 发出 WM_QUIT 消息
        return 0;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam); //默认时采用系统消息默认处理函数

    }

}