Actually Paul, here's a snippet using Bresenhams...
void PlotCircle( Int16 x, Int16 y, Int16 x1, Int16 y1 )
{
WinDrawPixel( x + x1, y + y1 ) ;
WinDrawPixel( x - x1, y + y1 ) ;
WinDrawPixel( x + x1, y - y1 ) ;
WinDrawPixel( x - x1, y - y1 ) ;
WinDrawPixel( x + y1, y + x1 ) ;
WinDrawPixel( x - y1, y + x1 ) ;
WinDrawPixel( x + y1, y - x1 ) ;
WinDrawPixel( x - y1, y - x1 ) ;
}
static void DrawCircle( Int16 x, Int16 y, Int16 r )
{
Int16 x1, y1, p ;
x1 = 0 ;
y1 = r ;
p = 3 - 2 * r ;
while ( x1 < y1 )
{
PlotCircle( x, y, x1, y1 ) ;
if ( p < 0 )
p = p + 4 * x1 + 6 ;
else
{
p = p + 4 * ( x1 - y1 ) + 10 ;
y1 = y1 - 1 ;
}
x1 = x1 + 1 ;
}
if ( x1 == y1 )
PlotCircle( x, y, x1, y1 ) ;
}
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