屏幕下雪代码,C代码库,德仔网

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【C】屏幕下雪
作者:严航 / 发布于2013/2/17/ 484
#include <windows.h> 
#include <time.h>             
const int ScrnWidth=1024; 
const int ScrnHight=768; 
const long SnowCol =0xFEFFFE; 
const long SnowColDown =0xFFFFFF; 
const long SnowColDuck =0xFFDDDD; 
const int SnowNum = 500; 
const int ID_TIMER = 1; 

const char g_szClassName[] = "myWindowClass"; 

typedef struct POINTAPI 
{ 
long x; 
long y; 
}a; 

static HDC hDC1; 
static struct POINTAPI pData[500]; 
static long pColor[500]; 
static int Vx,Vy,PVx,PVy,timecont; 

long Abs(long num) 
{ 
if(num>=0)return(num); 
else return(-num); 
} 

int Random(int max) 
{ 
return(rand()%max); 
} 

int InitP(int i) 
{ 
pData[i].x=Random(ScrnWidth); 
pData[i].y = Random(5); 
pColor[i] = GetPixel(hDC1, pData[i].x, pData[i].y); 
return 0;
} 

long GetContrast(int i) 
{ 
long ColorCmp; 
long tempR; 
long tempG; 
long tempB; 
int Slope; 

if(PVy!=0) Slope = PVx / PVy; 
else Slope = 2; 

if(Slope==0) ColorCmp = GetPixel(hDC1, pData[i].x, pData[i].y + 1); 
else if(Slope > 1) ColorCmp = GetPixel(hDC1, pData[i].x + 1, pData[i].y + 1); 
  else ColorCmp = GetPixel(hDC1, pData[i].x - 1, pData[i].y + 1); 

if(ColorCmp==SnowCol)return 0; 

tempB = Abs((ColorCmp>>16)&0xff - (pColor[i]>>16)&0xff); 
tempG = Abs((ColorCmp>>8)&0xff - (pColor[i]>>8)&0xff); 
tempR = Abs((ColorCmp)&0xff - (pColor[i])&0xff); 

//return(tempR * 0.114 + tempG * 0.587 + tempB * 0.299); 
return((tempR + tempG + tempB) / 3); 
} 

void DrawP(void) 
{ 
int i; 
// srand(time(0)); 
for(i=0;i<SnowNum;i++) 
{ 
  if(pColor[i]!=SnowCol&&pColor[i]!=-1)SetPixel(hDC1, pData[i].x, pData[i].y, pColor[i]); 

  PVx = Random(2) - 1 + Vx * (i % 3); 
  PVy = Vy * (i % 3 + 1); 
  pData[i].x = pData[i].x + PVx; 
  pData[i].y = pData[i].y + PVy; 
pColor[i] = GetPixel(hDC1, pData[i].x, pData[i].y); 

  if(pColor[i] ==-1)InitP(i); 
  else 
if(pColor[i]!=SnowCol) 
if (Random(16) > 5 || GetContrast(i) < 50)SetPixel(hDC1, pData[i].x, pData[i].y, SnowCol); 
else 
{ 
SetPixel(hDC1, pData[i].x, pData[i].y - 1, SnowColDuck); 
SetPixel(hDC1, pData[i].x - 1, pData[i].y, SnowColDuck); 
SetPixel(hDC1, pData[i].x + 1, pData[i].y, SnowColDown); 
InitP(i); 
} }}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{   




switch(msg) 
{ 
case WM_TIMER:
{ 
if(timecont>200) 
{ 
timecont=0; 
Vx = Random(4) - 2; 
Vy = Random(2) + 2; 
} 
else timecont+=1; 
DrawP(); 
  } 
break; 
case WM_CREATE: 
{ 
int j; 
srand(time(0)); 
Vx = Random(4) - 2; 
Vy = Random(2) + 2; 
for(j = 0;j<SnowNum;j++) 
{ 
pData[j].x = Random(ScrnWidth); 
pData[j].y = Random(ScrnHight); 
pColor[j] = GetPixel(hDC1, pData[j].x, pData[j].y); 
} 
SetTimer(hwnd, ID_TIMER, 10, NULL); 
hDC1 = GetDC(0); 
timecont=0; 
} 
break; 
case WM_CLOSE: 
ReleaseDC(0, hDC1); 
DestroyWindow(hwnd); 
break; 
case WM_DESTROY: 
KillTimer(hwnd, ID_TIMER); 
PostQuitMessage(0); 
break; 
default: 
return DefWindowProc(hwnd, msg, wParam, lParam); 
} 
return 0; 
} 

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, 
LPSTR lpCmdLine, int nCmdShow) 
{ 
WNDCLASSEX wc; 
HWND hwnd; 
MSG msg; 

wc.cbSize = sizeof(WNDCLASSEX); 
wc.style = 0; 
wc.lpfnWndProc = WndProc; 
wc.cbClsExtra = 0; 
wc.cbWndExtra = 0; 
wc.hInstance = hInstance; 
wc.hIcon = LoadIcon(NULL, IDI_APPLICATION); 
wc.hCursor = LoadCursor(NULL, IDC_ARROW); 
wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1); 
wc.lpszMenuName = NULL; 
wc.lpszClassName = g_szClassName; 
wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION); 

if(!RegisterClassEx(&wc)) 
{ 
MessageBox(NULL, "窗体注册失败！", "错误!", 
MB_ICONEXCLAMATION | MB_OK); 
return 0; 
} 

hwnd = CreateWindowEx( 
WS_EX_CLIENTEDGE, 
g_szClassName, 
"desktop snowing...... ", 
WS_OVERLAPPEDWINDOW, 
CW_USEDEFAULT, CW_USEDEFAULT, 240, 120, 
NULL, NULL, hInstance, NULL); 

if(hwnd == NULL) 
{ 
MessageBox(NULL, "窗体创建失败！", "错误！", 
MB_ICONEXCLAMATION | MB_OK); 
return 0; 
} 

ShowWindow(hwnd, nCmdShow); 
UpdateWindow(hwnd); 

while(GetMessage(&msg, NULL, 0, 0) > 0) 
{ 
TranslateMessage(&msg); 
DispatchMessage(&msg); 
} 
return msg.wParam; 
}
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