黑客帝国全屏版-优快云博客

这篇文章介绍了使用C++编写的Windows程序，实现了一个动态字符链并在屏幕上形成不断滚动的矩阵，通过定时器控制字符的显示和位置变化，响应鼠标事件控制矩阵的暂停和继续。
按任意键即可退出
#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);	//函数声明
typedef struct tagCharChain {
	struct tagCharChain *prev; //链表的前一个元素
	TCHAR ch; //一个显示列中的一个字符
	struct tagCharChain *next; //链表的后一个元素
}
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Windows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;
}

//随机字符产生函数
TCHAR randomChar() {
	return (TCHAR)(rand() % (126 - 33) + 33); //33到126之间
}

//初始化
int init(CharColumn *cc, int cyScreen, int x) {
	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);	//屏幕高度
			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;
		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);
}