protected override Color FunctionColor( Complex c )
{
var z = new Complex( 0.0, 0.0 );
int count = 0;
int maxCount = 512;
while ( count < maxCount ) {
z = z * z + c;
if ( z.MagnitudeSqr() > 4 ) return ColorMap(count);
count += 1;
}
return Colors.Black;
}