Special Program for snow float on the desktop

# Include <windows. h>
# Include <time. h>
# Include <stdlib. h>
# Include <iostream. h>
Const int snownumber = 500; // Number of snow points
Struct snownode
{
Point postion; // the location of the snow point.
Int icolor; // previous color
Int ispeed; // Fall speed
Int imove; // The dropping distance.
Int istick; // paste degree
};
Snownode snownodes [snownumber]; // snow point Array
Int htimer = 0;
Int crwind = 0;
Int crstep = 0; // number of current cyclic steps (used for speed limit)
Int screenwidth = 0; // screen width
Int screenheight = 0; // screen height
Void getscreensize ();
Void callback timerproc (handle hwnd, uint umsg, uint idevent, DWORD dwtime );
Void initsnownodes ();
Void movesnownodes ();
Int winapi winmain (hinstance,
Hinstance hprevinstance,
Lpstr lpcmdline,
Int ncmdshow
)
{

MSG; // standard Windows message
Large_integer frequency; // high-performance timer frequency
Large_integer startct, endct; // high-performance timer count
Float elapsedtime; // Interval
Srand (unsigned) Time (null ));
Getscreensize ();
Initsnownodes ();
Queryperformancefrequency (& frequency );
Htimer = settimer (500, Rand () % 5 *, (timerproc );
If (htimer = 0)
{
MessageBox (0, text ("failed to create timer"), text ("prompt"), mb_ OK | mb_iconinformation );
Return-1;
}
Registerhotkey (0, 0, mod_control, (INT) 'l ');
While (1)
{
Queryperformancecounter (& startct); // The count before the operation is executed.
If (peekmessage (& MSG, 0, 0, 1 ))
{
Switch (msg. Message)
{
Case wm_timer: timerproc (0, 0, 0 );
Break; // the preset time for changing the wind direction has reached
Case wm_hotkey: killtimer (0, htimer); // Delete the random wind direction Timer
Unregisterhotkey (); // Delete the exit hotkey
Invalidaterect (0, null, true );
Exit (1 );
Break;
Case wm_displaychange:
Getscreensize (); // obtain the screen size again
Initsnownodes (); // initializes an array of snow points.
Break;
}
}
Movesnownodes ();
Queryperformancecounter (& endct); // The Count value after the operation is executed.
Elapsedtime = (endct. QuadPart-StartCt.QuadPart)/frequency. quadpart;
If (elapsedtime <0.0005 ))
Sleep (2); // simple speed limit
Else if (elapsedtime <0.0010)
Sleep (1 );
Else if (elapsedtime <0.0015)
Sleep (3 );
}
// MessageBox (0, text ("message"), text ("message"), mb_ OK | mb_iconinformation );
Return 0;
}
Void getscreensize ()
{
Screenwidth = getsystemmetrics (sm_cxscreen );
Screenheight = getsystemmetrics (sm_cyscreen );
Return;
}
Void callback timerproc (handle hwnd, uint umsg, uint idevent, DWORD dwtime)
{
// MessageBox (0, text ("message"), text ("message"), mb_ OK | mb_iconinformation );
Srand (unsigned) Time (null ));
If (htimer = 0)
{
MessageBox (0, text ("failed to create timer"), text ("prompt"), mb_ OK | mb_iconinformation );
Return;
}
Settimer (0, htimer, (RAND () % 27 + 4) * 500), (timerproc); // reset the next wind direction change time
// Modify the wind direction
If (crwind! = 0)
Crwind = 0;
Else
Crwind = rand () % 3-1;
Return;
}
Void initsnownodes ()
{
HDC hscreendc = 0;
Int J = 0;
Hscreendc = createdc ("display", null );
If (hscreendc = NULL)
{
MessageBox (0, "An error occurred while obtaining the screen DC! "," Information ", mb_ OK | mb_iconerror );
Return;
}
Srand (unsigned) Time (null ));
For (j = 0; j <snownumber; j ++)
{
Snownodes [J]. postion. x = rand () % screenwidth;
Snownodes [J]. postion. Y = rand () % screenheight;
Snownodes [J]. icolor = getpixel (hscreendc, snownodes [J]. postion. X, snownodes [J]. postion. y );
Snownodes [J]. ispeed = (RAND () % 5 + 1); // the distance between each fall (1-5)
Snownodes [J]. istick = (30-rand () % snownodes [J]. ispeed); // paste degree (several cycles for one-time Pasting and connection judgment)
// Cout <snownodes [J]. postion. x <"Y:" <snownodes [J]. postion. Y <Endl;

}
Deletedc (hscreendc );
}
Void movesnownodes ()
{
// MessageBox (0, text ("message"), text ("message"), mb_ OK | mb_iconinformation );
HDC hscreendc = 0;
Srand (unsigned) Time (null ));
Int x = 0, y = 0, I = 0;
Hscreendc = createdc ("display", null );
If (hscreendc = NULL)
{
MessageBox (0, "An error occurred while obtaining the screen DC! "," Information ", mb_ OK | mb_iconerror );
Return;
}
// Textout (hscreendc, 0, 0, "although the big check is successful, it is 0 );
For (I = 0; I <snownumber; I ++)
{
// Control the speed of snow point descent
If (crstep % snownodes. Ispeed )! = 0)
Continue;
// Restore the last overwritten Vertex
If (getpixel (hscreendc, snownodes. Postion. X, snownodes. Postion. y) = 0 xffffff)
Setpixel (hscreendc, snownodes. Postion. X, snownodes. Postion. Y, snownodes. Icolor );
// Perform random falling based on several directions
X = snownodes. Postion. x + rand () % 3 + crwind;
Y = snownodes. Postion. Y + snownodes. Imove;
// Handle the snow Effect
If (crstep % snownodes. Istick) = 0)
& (Getpixel (hscreendc, x, y ))! = (Getpixel (hscreendc, X, Y + 1 )))
& (Getpixel (hscreendc, x-1, y ))! = (Getpixel (hscreendc, x-1, Y + 1 )))
& (Getpixel (hscreendc, x + 1, y ))! = Getpixel (hscreendc, x + 1, Y + 1 ))
)
{
// Adjust coordinates slightly
If (getpixel (hscreendc, X, Y-1) = getpixel (hscreendc, X, y-2 ))
{
Y --;
}
Else
{
If (getpixel (hscreendc, X, Y-1) = getpixel (hscreendc, X, y-2 ))
Y ++;
X + = crwind;
}
// Draw three snowflake points
Setpixel (hscreendc, X, Y, 0 xffffff );
Setpixel (hscreendc, x + 1, Y + 1, 0 xffffff );
Setpixel (hscreendc, x-1, Y + xffffff );
// Regenerate the snow point
Snownodes. Postion. x = rand () % screenwidth;
Snownodes. Postion. Y = rand () % 10;
Snownodes. Icolor = getpixel (hscreendc, snownodes. Postion. X, snownodes. Postion. y );

}
Else
{
If (x <0) | (x> screenwidth) | (Y> screenheight ))
{
Snownodes. Postion. x = (RAND () % 10 );
Snownodes. Postion. Y = (RAND () % screenwidth );
Snownodes. Icolor = getpixel (hscreendc, snownodes. Postion. X, snownodes. Postion. y );
}
Else
{
// Save the color and draw the snow point
Snownodes. Icolor = getpixel (hscreendc, x, y );
Setpixel (hscreendc, X, Y, 0 xffffff );
// Save the position of the new snow point
Snownodes. Postion. x = X;
Snownodes. Postion. Y = y;
}
}
}
Deletedc (hscreendc );
Crstep ++;
}