本程序vs2013 測試通過,不排除其他測試通過用例,主要是windows API的應用
#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; //鏈表的後個元素
}CharChain, *pCharChain;
typedef struct tagCharColumn
{
CharChain *head, *current, *point;
int x, y, iStrLen; //顯示列的開始顯示的x,y座標,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;
cc->x = x + 3;
cc->y = rand() % 3 ? rand() % cyScreen : 0;
cc->iStopTimes = 0;
cc->head = cc->current =
(pCharChain)calloc(cc->iStrLen, sizeof(CharChain));
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+1一個顯示列的後個元素
cc->point = cc->current++; //cc->point = cc->current; cc->current++;
}
cc->current->prev = cc->point; //最後一個節點
cc->current->ch = '\0';
cc->current->next = cc->head;
cc->head->prev = cc->current; //頭節點的前一個爲此鏈的最後一個元素
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;
int i, j, temp, ctn;
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); //設置背景模式爲 透明
iColumnCount = cxScreen / (iFontWidth * 1 / 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
//第一個字符顯示爲綠
SetTextColor(hdcMem, RGB(0, 255, 0));
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,將這個顯示列裏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座標 爲當前的y座標加上 一個字符的高度
//如果開始顯示的y座標減去 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 爲此鏈表的前個元素,因爲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,然後在開始往上顯示
(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;
//處理善後工作
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);
}