代码雨

#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) ; 
}

效果图