private IEnumerable <GeoIndex> NaiveNearestIndexes(GeoPoint point, Distance distance)
{
var center = indexes.GetIndex(point);
var length = (int)Math.Ceiling(distance / resolution) * 2;
if (length == 0)
{
var index = new GeoIndex(center.X, center.Y);
if (indexes.IsIndexValid(index))
{
yield return(index);
}
yield break;
}
for (var x = center.X - length; x <= center.X + length; x++)
{
for (var y = center.Y - length; y <= center.Y + length; y++)
{
var index = new GeoIndex(x, y);
if (indexes.IsIndexValid(index) && indexes.GetGeoPoint(index).GetDistance(point) <= distance)
{
yield return(index);
}
}
}
}
public virtual IEnumerable <IVisual> Query(Rectangle clipBounds, ZOrder zOrder)
{
IEnumerable <IVisual> search = GeoIndex.Query(clipBounds);
if (zOrder == ZOrder.EdgesFirst)
{
foreach (var visual in search)
{
if (visual is IVisualEdge)
{
if (DrawingExtensions.Intersects(clipBounds, visual.Shape.BoundsRect))
{
yield return(visual);
}
}
}
}
foreach (var visual in search)
{
if (!(visual is IVisualEdge))
{
if (DrawingExtensions.Intersects(clipBounds, visual.Shape.BoundsRect))
{
yield return(visual);
}
}
}
if (zOrder == ZOrder.NodesFirst)
{
foreach (var visual in search)
{
if (visual is IVisualEdge)
{
if (DrawingExtensions.Intersects(clipBounds, visual.Shape.BoundsRect))
{
yield return(visual);
}
}
}
}
}
public override IEnumerable <IVisual> Query()
{
var search = GeoIndex.QueryAll();
foreach (var visual in search)
{
if (!(visual is IVisualEdge))
{
yield return(visual);
}
}
foreach (var visual in search)
{
if (visual is IVisualEdge)
{
yield return(visual);
}
}
}
public List <Suburb> this[GeoIndex index]
{
get => suburbs[index.X][index.Y];
