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Author: Final-Resolution

code.txt

@@ -0,0 +1,217 @@
+#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,其实就是每列的速度，速度=计时器大小*iMustStopTimes。  
+}CharColumn, *pCharColumn;
+
+int main(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
+{
+	static TCHAR szAppName[] = TEXT("matrix");
+	HWND hwnd;//窗口句柄  
+	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,cyScreen屏幕高度  
+{
+	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->iMustStopTimes = rand()%(200-100)+100;读者可以把速度调慢点，我调的是1s~2s，注意此时计时器需要调为10ms  
+	cc->iStopTimes = 0;
+	cc->head = cc->current = (pCharChain)calloc(cc->iStrLen, sizeof(CharChain)); //分配连续iStrLen个CharChain类型空间  
+
+	for (j = 0; j<cc->iStrLen - 1; j++)//遍历 iStrLen-1 次  
+	{
+		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;
+
+	//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  
+	//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;
+	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)
+	{
+		//系统给消息处理程序发送的消息，每次窗口创建，有且只有1个WM_CREATE消息，所以只运行1次，可以在这里初始化滚动条，获取字体宽度、高度，创建子窗口、控件等等  
+	case WM_CREATE:
+		cxScreen = GetSystemMetrics(SM_CXSCREEN); //屏幕宽度  
+		cyScreen = GetSystemMetrics(SM_CYSCREEN); //屏幕高度  
+
+												  //hwnd调用，计时器命名为ID_TIMER，时间间隔10ms。给读者一个小技巧，因为10ms太小，读者难免很难发现玄机，所以建议读者在理解代码时将时间改为1000ms  
+		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;
+
+		//计时器间隔10ms，该消息每隔10ms触发一次  
+	case WM_TIMER:
+		hdc = GetDC(hwnd);
+		PatBlt(hdcMem, 0, 0, cxScreen, cyScreen, BLACKNESS); //将内存设备映像刷成黑色,不理解含义可以注释此句再运行，对比一下即可  
+
+		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  
+
+			SetTextColor(hdcMem, RGB(255, 255, 255));//第一个字符显示为白色  
+			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  
+
+					  //注意第二个判断条件，init函数里除了head节点，其他节点都是'\0'，正是第二个判断才给我们运行起初字母是一个一个增多的效果，读者可以换成下面的句子运行看看  
+					  //while ((ccChain + i)->point != (ccChain + i)->head)  
+			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 就相当于在整个显示列的开头添加个元素,然后再开始往上显示  
+			(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: //任意键退出  
+	case WM_LBUTTONDOWN: //点击鼠标退出  
+	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);
+}