public List<Circle> FillWithRandomCircles(SizeF areaSize)
        {
            const float margin = 1f;
            const float maxSize = 10f;
            const float minSize = 3f;
            const int maxTries = 1000;
            const int numCirclesAttempts = 2000;

            var circles = new List<Circle>();
            for (var i = 0; i < numCirclesAttempts; i++)
            {
                PointF newPoint;
                float newRadius;
                List<CircleDistance> distances;
                int tries = 0;
                do
                {
                    newPoint = new PointF(_random.Next(0, (int)areaSize.Width) , _random.Next(0, (int)areaSize.Height) );
                    distances = circles.Select(c => DistanceFromCircle(c, newPoint)).ToList();
                    newRadius = distances.Any() ? Math.Min((float)distances.Min(d => d.Distance - d.Radius), maxSize) - margin : maxSize;
                } while (tries++ < maxTries && (newRadius < minSize || IsOutOfBounds(newPoint, newRadius, areaSize) || distances.Any(d => d.Distance < d.Radius + margin)));

                if (tries < maxTries)
                {
                    var newCircle = new Circle
                    {
                        Color = RandomPastelColor(),
                        Position = newPoint,
                        RadiusSize = newRadius,
                    };
                    circles.Add(newCircle);
                }
                else
                    break;
            }
            return circles;
        }
 private CircleDistance DistanceFromCircle(Circle circle, PointF point)
 {
     var distance = Distance(circle.Position, point);
     return new CircleDistance {Radius = circle.RadiusSize, Distance = distance};
 }