C++实现代码雨

来源：互联网发布：maxcms源码编辑：程序博客网时间：2024/05/22 06:11
小伙伴发来的强大代码，据说能实现下图的效果
#include <windows.h> #define ID_TIMER    1 #define STRMAXLEN  25 //一个显示列的最大长度 #define STRMINLEN  8  //一个显示列的最小长度 LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ; ////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////// typedef struct tagCharChain //整个当作屏幕的一个显示列,这是个双向列表 {         struct tagCharChain *prev; //链表的前个元素         TCHAR  ch;                  //一个显示列中的一个字符         struct tagCharChain *next; //链表的后个元素 }CharChain, *pCharChain; typedef struct tagCharColumn {         CharChain *head, *current, *point;         int x, y, iStrLen; //显示列的开始显示的x,y坐标,iStrLen是这个列的长度         int iStopTimes, iMustStopTimes; //已经停滞的次数和必须停滞的次数,必须停滞的次数是随机的 }CharColumn, *pCharColumn; int main(HINSTANCE hInstance, HINSTANCE hPrevInstance,         PSTR szCmdLine, int iCmdShow) {         static TCHAR szAppName[] = TEXT ("matrix") ;         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 (BLACK_BRUSH) ;         wndclass.lpszMenuName        = NULL ;         wndclass.lpszClassName        = szAppName ;         if(!RegisterClass (&wndclass))         {                 MessageBox (NULL, TEXT ("此程序必须运行在NT下!"), szAppName, MB_ICONERROR) ;                 return 0;         }         hwnd = CreateWindow (szAppName, NULL,                 WS_DLGFRAME | WS_THICKFRAME | WS_POPUP,                 0, 0,                 GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN),                 NULL, NULL, hInstance,                 NULL) ;         ShowWindow (hwnd, SW_SHOWMAXIMIZED) ; //最大化显示         UpdateWindow (hwnd) ;         ShowCursor(FALSE); //隐藏鼠标光标         srand ((int) GetCurrentTime ()) ; //初始化随机数发生器         while (GetMessage (&msg, NULL, 0, 0))         {                 TranslateMessage (&msg) ;                 DispatchMessage (&msg) ;         }         ShowCursor(TRUE); //显示鼠标光标         return msg.wParam ; } TCHAR randomChar() //随机字符产生函数 {         return (TCHAR)(rand()%(126-33)+33); //33到126之间 } int init(CharColumn *cc, int cyScreen, int x) //初始化 {         int j;         cc->iStrLen = rand()%(STRMAXLEN-STRMINLEN) + STRMINLEN; //显示列的长度         cc->x = x+3 ;        //显示列的开始显示的x坐标         cc->y =rand()%3?rand()%cyScreen:0; //显示列的开始显示的y坐标         cc->iMustStopTimes = rand()%6 ;         cc->iStopTimes    = 0 ;         cc->head = cc->current =                 (pCharChain)calloc(cc->iStrLen, sizeof(CharChain)); //生成显示列         for(j=0; j<cc->iStrLen-1; j++)         {                 cc->current->prev = cc->point; //cc->point一个显示列的前个元素                 cc->current->ch  = '\0';                 cc->current->next = cc->current+1; //cc->current+1一个显示列的后个元素                 cc->point          = cc->current++; //cc->point = cc->current; cc->current++;         }         cc->current->prev = cc->point; //最后一个节点         cc->current->ch  = '\0';         cc->current->next = cc->head;         cc->head->prev    = cc->current; //头节点的前一个为此链的最后一个元素         cc->current = cc->point = cc->head; //free掉申请的内存要用current当参数         cc->head->ch = randomChar(); // 对链表头的 元素填充         return 0; } LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {         HDC          hdc ;         //ctn 用来确定一个显示链是否 向下前进,如果等待次数超过必须等待的次数,ctn就代表要向下前进         int i, j, temp, ctn; //j为一个显示链中除链表头外的在屏幕上显示的y坐标,temp绿色过度到黑色之用         static  HDC hdcMem;         HFONT    hFont;         static  HBITMAP hBitmap;         static  int cxScreen, cyScreen; //屏幕的宽度 高度.         static  int iFontWidth=10, iFontHeight=15, iColumnCount; //字体的宽度 高度, 列数         static  CharColumn *ccChain;         switch (message)         {         case WM_CREATE:                 cxScreen = GetSystemMetrics(SM_CXSCREEN) ; //屏幕宽度                 cyScreen = GetSystemMetrics(SM_CYSCREEN) ;                 SetTimer (hwnd, ID_TIMER, 10, NULL) ;                 hdc = GetDC(hwnd);                 hdcMem = CreateCompatibleDC(hdc);                 hBitmap = CreateCompatibleBitmap(hdc, cxScreen, cyScreen);                 SelectObject(hdcMem, hBitmap);                 ReleaseDC(hwnd, hdc);                 //创建字体                 hFont = CreateFont(iFontHeight, iFontWidth-5, 0, 0, FW_BOLD, 0, 0, 0,                         DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS,                         DRAFT_QUALITY, FIXED_PITCH | FF_SWISS, TEXT("Fixedsys"));                 SelectObject(hdcMem, hFont);                 DeleteObject (hFont) ;                 SetBkMode(hdcMem, TRANSPARENT); //设置背景模式为 透明                 iColumnCount = cxScreen/(iFontWidth*3/2); //屏幕所显示字母雨的列数                 ccChain = (pCharColumn)calloc(iColumnCount, sizeof(CharColumn));                 for(i=0; i<iColumnCount; i++)                 {                         init(ccChain+i, cyScreen, (iFontWidth*3/2)*i);                 }                 return 0 ;         case WM_TIMER:                 hdc = GetDC(hwnd);                 PatBlt (hdcMem, 0, 0, cxScreen, cyScreen, BLACKNESS) ; //将内存设备映像刷成黑色                 for(i=0; i<iColumnCount; i++)                 {                         ctn = (ccChain+i)->iStopTimes++ > (ccChain+i)->iMustStopTimes;                         //                         (ccChain+i)->point = (ccChain+i)->head; //point用于遍历整个显示列                         //第一个字符显示为 白色                         SetTextColor(hdcMem, RGB(255, 255, 255));                         TextOut(hdcMem, (ccChain+i)->x, (ccChain+i)->y, &((ccChain+i)->point->ch), 1);                         j = (ccChain+i)->y;                          (ccChain+i)->point = (ccChain+i)->point->next;                         //遍历整个显示列,将这个显示列里的字符从下往上显示                         temp = 0 ; //temp绿色过度到黑色之用                         while((ccChain+i)->point != (ccChain+i)->head && (ccChain+i)->point->ch)                         {                                 SetTextColor(hdcMem, RGB(0, 255-(255*(temp++)/(ccChain+i)->iStrLen), 0));                                 TextOut(hdcMem, (ccChain+i)->x, j-=iFontHeight, &((ccChain+i)->point->ch), 1);                                 (ccChain+i)->point = (ccChain+i)->point->next;                         }                         if(ctn)                                 (ccChain+i)->iStopTimes = 0 ;                         else continue;                         (ccChain+i)->y += iFontHeight; //下次开始显示的y坐标 为当前的y坐标加上 一个字符的高度                         //如果开始显示的y坐标减去 整个显示列的长度超过了屏幕的高度                         if( (ccChain+i)->y-(ccChain+i)->iStrLen*iFontHeight > cyScreen)                         {                                 free( (ccChain+i)->current );                                 init(ccChain+i, cyScreen, (iFontWidth*3/2)*i);                         }                         //链表的头 为此链表的前个元素,因为下次开始显示的时候 就相当与在整个显示列的开头添加个元素,然后在开始往上显示                         (ccChain+i)->head = (ccChain+i)->head->prev;                         (ccChain+i)->head->ch = randomChar();                 }                 BitBlt(hdc, 0, 0, cxScreen, cyScreen, hdcMem, 0, 0, SRCCOPY);                 ReleaseDC(hwnd, hdc);                 return 0;         case WM_RBUTTONDOWN:                 KillTimer (hwnd, ID_TIMER) ;                 return 0;         case WM_RBUTTONUP:                 SetTimer (hwnd, ID_TIMER, 10, NULL) ;                 return 0;                 //处理善后工作         case WM_KEYDOWN:         case WM_LBUTTONDOWN:         case WM_DESTROY:                 KillTimer (hwnd, ID_TIMER) ;                 DeleteObject(hBitmap);                 DeleteDC(hdcMem);                 for(i=0; i<iColumnCount; i++)                 {                         free( (ccChain+i)->current );                 }                 free(ccChain);                 PostQuitMessage (0) ;                 return 0 ;         }         return DefWindowProc (hwnd, message, wParam, lParam) ; }
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