public static Circle2d From2Points(Point2d p1, Point2d p2)
{
Point2d center = new Point2d((p1.X + p2.X) / 2.0, (p1.Y + p2.Y) / 2.0);
return(new Circle2d(center, center.Distance(p1)));
}
public override double Distance(Point2d p)
{
return(Math.Abs(center.Distance(p) - radius));
}
public Circle2d(double xcenter, double ycenter, double radius)
{
this.center = new Point2d(xcenter, ycenter);
this.radius = radius;
}
public Circle2d(Circle2d tocopy)
{
center = tocopy.center;
radius = tocopy.radius;
}
public Parabola2d(Parabola2d tocopy)
{
vertex = tocopy.vertex;
rotation = tocopy.rotation;
a = tocopy.a;
}
public Circle2d(Point2d center, double radius)
{
this.center = center;
this.radius = radius;
}
public override double Distance(Point2d p)
{
return(ClosestPoint(p).Distance(p));
}
public override double PositionOf(Point2d pnt)
{
//parameter is same as parameter on line in angle of parabola
return(new Line2d(vertex, vertex + Vector2d.FromAngle(rotation)).PositionOf(pnt));
}
public override Point2d ClosestPoint(Point2d from)
{
return(from.ClosestPoint(Perpendicular(from)));
}
public void Append(Point2d p)
{
Append(p.X, p.Y);
}
public bool Contains(Point2d p)
{
return(Contains(p.X, p.Y));
}