画圆GDI

int x = 200;
int y = 200;
int L = 50;

int DrawEllipse(int x,int y,int width,int height)
{
 Arc(hdc,x,y,x+width,y+height,x/2,y,x/2,y);
 return 0;
}

//LineTo(hdc,1024,690)  - 屏幕宽高
int Render()
{
    x = rand()%1024;
 y = rand()%768;
 DrawEllipse(x,y,rand()%200,rand()%200);
 Sleep(100);
 return 0;
}