閑逛的時候發現了一個很好玩的程序
摘自：https://blog.csdn.net/u012837895/article/details/20849967#comments
效果如下
#include <windows.h> #define ID_TIMER 1 #define STRMAXLEN 25 //一個顯示列的最大長度 #define STRMINLEN 8 //一個顯示列的最小長度 LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); ////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////// typedef struct tagCharChain //整個當作屏幕的一個顯示列,這是個雙向列表 { struct tagCharChain *prev; //鏈表的前個元素 TCHAR ch; //一個顯示列中的一個字符 struct tagCharChain *next; //鏈表的后個元素 }CharChain, *pCharChain; typedef struct tagCharColumn { CharChain *head, *current, *point; int x, y, iStrLen; //顯示列的開始顯示的x,y坐標,iStrLen是這個列的長度 int iStopTimes, iMustStopTimes; //已經停滯的次數和必須停滯的次數,必須停滯的次數是隨機的 }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("此程序必須運行在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); //最大化顯示 UpdateWindow(hwnd); ShowCursor(FALSE); //隱藏鼠標光標 srand((int)GetCurrentTime()); //初始化隨機數發生器 while (GetMessage(&msg, NULL, 0, 0)) { TranslateMessage(&msg); DispatchMessage(&msg); } ShowCursor(TRUE); //顯示鼠標光標 return msg.wParam; } TCHAR randomChar() //隨機字符產生函數 { return (TCHAR)(rand() % (126 - 33) + 33); //33到126之間 } int init(CharColumn *cc, int cyScreen, int x) //初始化 { int j; cc->iStrLen = rand() % (STRMAXLEN - STRMINLEN) + STRMINLEN; //顯示列的長度 cc->x = x + 3; //顯示列的開始顯示的x坐標 cc->y = rand() % 3 ? rand() % cyScreen : 0; //顯示列的開始顯示的y坐標 cc->iMustStopTimes = rand() % 6; cc->iStopTimes = 0; cc->head = cc->current = (pCharChain)calloc(cc->iStrLen, sizeof(CharChain)); //生成顯示列 for (j = 0; j < cc->iStrLen - 1; j++) { cc->current->prev = cc->point; //cc->point一個顯示列的前個元素 cc->current->ch = '\0'; cc->current->next = cc->current + 1; //cc->current+1一個顯示列的后個元素 cc->point = cc->current++; //cc->point = cc->current; cc->current++; } cc->current->prev = cc->point; //最后一個節點 cc->current->ch = '\0'; cc->current->next = cc->head; cc->head->prev = cc->current; //頭節點的前一個為此鏈的最后一個元素 cc->current = cc->point = cc->head; //free掉申請的內存要用current當參數 cc->head->ch = randomChar(); // 對鏈表頭的 元素填充 return 0; } LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { HDC hdc; //ctn 用來確定一個顯示鏈是否 向下前進,如果等待次數超過必須等待的次數,ctn就代表要向下前進 int i, j, temp, ctn; //j為一個顯示鏈中除鏈表頭外的在屏幕上顯示的y坐標,temp綠色過度到黑色之用 static HDC hdcMem; HFONT hFont; static HBITMAP hBitmap; static int cxScreen, cyScreen; //屏幕的寬度 高度. static int iFontWidth = 10, iFontHeight = 15, iColumnCount; //字體的寬度 高度, 列數 static CharColumn *ccChain; switch (message) { case WM_CREATE: cxScreen = GetSystemMetrics(SM_CXSCREEN); //屏幕寬度 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); //創建字體 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); //設置背景模式為 透明 iColumnCount = cxScreen / (iFontWidth * 3 / 2); //屏幕所顯示字母雨的列數 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); //將內存設備映像刷成黑色 for (i = 0; i < iColumnCount; i++) { ctn = (ccChain + i)->iStopTimes++ > (ccChain + i)->iMustStopTimes; // (ccChain + i)->point = (ccChain + i)->head; //point用於遍歷整個顯示列 //第一個字符顯示為 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; //遍歷整個顯示列,將這個顯示列里的字符從下往上顯示 temp = 0; //temp綠色過度到黑色之用 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; //下次開始顯示的y坐標 為當前的y坐標加上 一個字符的高度 //如果開始顯示的y坐標減去 整個顯示列的長度超過了屏幕的高度 if ((ccChain + i)->y - (ccChain + i)->iStrLen*iFontHeight > cyScreen) { free((ccChain + i)->current); init(ccChain + i, cyScreen, (iFontWidth * 3 / 2)*i); } //鏈表的頭 為此鏈表的前個元素,因為下次開始顯示的時候 就相當與在整個顯示列的開頭添加個元素,然后在開始往上顯示 (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; //處理善后工作 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); }