C++字符雨效果

#include <windows.h> #define STRMAXLEN 25 #define STRMINLEN 8 LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ; ////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////// typedef struct tagCharChain { struct tagCharChain *prev; TCHAR ch; struct tagCharChain *next; }CharChain, *pCharChain; typedef struct tagCharColumn { CharChain *head, *current, *point; int x, y, iStrLen; int iStopTimes, iMustStopTimes; }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) ; UpdateWindow (hwnd) ; ShowCursor(FALSE); srand ((int) GetCurrentTime ()) ; while (GetMessage (&msg, NULL, 0, 0)) { TranslateMessage (&msg) ; DispatchMessage (&msg) ; } ShowCursor(TRUE); return msg.wParam ; } TCHAR randomChar() { return (TCHAR)(rand()%(126-33)+33); } int init(CharColumn *cc, int cyScreen, int x) { int j; cc->iStrLen = rand()%(STRMAXLEN-STRMINLEN) + STRMINLEN; cc->x = x+3 ; cc->y =rand()%3?rand()%cyScreen:0; cc->iMustStopTimes = rand()%6 ; cc->iStopTimes = 0 ; cc->head = cc->current = (pCharChain)calloc(cc->iStrLen, sizeof(CharChain)); for(j=0; j<cc->iStrLen-1; j++) { cc->current->prev = cc->point; cc->current->ch = '\0'; cc->current->next = cc->current+1; cc->point = cc->current++; //cc->point = cc->current; cc->current++; } cc->current->prev = cc->point; cc->current->ch = '\0'; cc->current->next = cc->head; cc->head->prev = cc->current; cc->current = cc->point = cc->head; cc->head->ch = randomChar(); return 0; } LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { HDC hdc ; int i, j, temp, ctn; unsigned int ID_TIMER=0; static HDC hdcMem; HFONT hFont; static HBITMAP hBitmap; static int cxScreen, cyScreen; static int iFontWidth=10, iFontHeight=15, iColumnCount; static CharColumn *ccChain; switch (message) { case WM_CREATE: cxScreen = GetSystemMetrics(SM_CXSCREEN) ; 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); 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); iColumnCount = cxScreen/(iFontWidth*3/2); 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) ; for(i=0; i<iColumnCount; i++) { ctn = (ccChain+i)->iStopTimes++ > (ccChain+i)->iMustStopTimes; (ccChain+i)->point = (ccChain+i)->head; 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; temp = 0 ; 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; if( (ccChain+i)->y-(ccChain+i)->iStrLen*iFontHeight > cyScreen) { free( (ccChain+i)->current ); init(ccChain+i, cyScreen, (iFontWidth*3/2)*i); } (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; 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) ; }