C++實現黑客帝國流星雨效果

源代碼在這里

#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用于遍歷整個顯示列//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); }

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