public void EnsureRadius(int radius)
{
if (radius > current_radius)
{
RectI2 old_rect = RectI2Extensions.CreateCenterRectI2(VectorI2.ZERO, new VectorI2(current_radius * 2, current_radius * 2));
RectI2 new_rect = RectI2Extensions.CreateCenterRectI2(VectorI2.ZERO, new VectorI2(radius * 2, radius * 2));
new_rect.GetSubtraction(old_rect)
.Convert(r => r.GetPoints())
.Flatten()
.Process(p => points.Add(new RadiatingPoint(p)));
current_radius = radius;
points.Sort((x, y) => x.GetDistance().CompareTo(y.GetDistance()));
}
}
