<>C++实现黑客帝国流星雨效果

源代码在这里
#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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