#include <windows.h>
#include <time.h>
#include <math.h>

LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);

char szClassName[ ] = "WindowsApp";
HWND hwnd; 
int WINAPI WinMain (HINSTANCE hThisInstance,
                    HINSTANCE hPrevInstance,
                    LPSTR lpszArgument,
                    int nFunsterStil)

{
MSG messages;            
WNDCLASSEX wincl;        

    
wincl.hInstance = hThisInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure;      
wincl.style = CS_DBLCLKS;                 
wincl.cbSize = sizeof (WNDCLASSEX);

wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = NULL;                 
wincl.cbClsExtra = 0;                     
wincl.cbWndExtra = 0;                     

wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;

if (!RegisterClassEx (&wincl))
return 0;

hwnd = CreateWindowEx (
0,                  
szClassName,         
"ellipsin",       
WS_OVERLAPPEDWINDOW, 
CW_USEDEFAULT,       
CW_USEDEFAULT,       
700,                 
700,                
HWND_DESKTOP,        
NULL,                
hThisInstance,       
NULL                 
);

ShowWindow (hwnd, nFunsterStil);

while (GetMessage (&messages, NULL, 0, 0))
{
TranslateMessage(&messages);
DispatchMessage(&messages);
}

return messages.wParam;
}

LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)                 
{       
srand(time(0)); 
case WM_PAINT:
{
HDC hdc;
hdc=GetDC(hwnd);
int x = 0;
int a = 0;
int b = 50;
int c = 50;
int d = 50;
for ( x = 0; x < 3600;x++)
{
a = (rand()%360) + 100;
int y = a + b*sin(c*x + d) ;

Ellipse(hdc,x,y,x+5,y+5); 

}

} 
break;
           
case WM_DESTROY:
PostQuitMessage (0);       
break;
default:                      
return DefWindowProc (hwnd, message, wParam, lParam);
}

return 0;
}