private static alglib.ndimensional_pfunc CreateCircleOfKnownRadiusDistanceFunction(double radius)
{
return(delegate(double[] c, double[] x, ref double func, object obj)
{
var circle = new Circle2(new Vector2(c[0], c[1]), radius);
var point = new Vector2(x[0], x[1]);
func = circle.DistanceFromCircle(point);
});
}
private static void CircleDistanceFunction(double[] c, double[] x, ref double func, object obj)
{
var cx = c[0];
var cy = c[1];
var r = c[2];
if (r < 0)
{
func = double.PositiveInfinity; // negative radius
}
else
{
var circle = new Circle2(new Vector2(c[0], c[1]), c[2]);
var point = new Vector2(x[0], x[1]);
func = circle.DistanceFromCircle(point);
}
}