/// <summary>
/// Returns all the objects within a given bounding box and filtered by a given filter.
/// </summary>
/// <param name="box"></param>
/// <param name="filter"></param>
/// <returns></returns>
public override IList<OsmGeo> Get(GeoCoordinateBox box, Filter filter)
{
List<OsmGeo> res = new List<OsmGeo>();
// load all nodes and keep the ids in a collection.
HashSet<long> ids = new HashSet<long>();
foreach (Node node in _nodes.Values)
{
if ((filter == null || filter.Evaluate(node)) &&
box.Contains(new GeoCoordinate(node.Latitude.Value, node.Longitude.Value)))
{
res.Add(node);
ids.Add(node.Id.Value);
}
}
// load all ways that contain the nodes that have been found.
res.AddRange(this.GetWaysFor(ids).Cast<OsmGeo>()); // the .Cast<> is here for Windows Phone.
// get relations containing any of the nodes or ways in the current results-list.
List<Relation> relations = new List<Relation>();
HashSet<long> relationIds = new HashSet<long>();
foreach (OsmGeo osmGeo in res)
{
IList<Relation> relationsFor = this.GetRelationsFor(osmGeo);
foreach (Relation relation in relationsFor)
{
if (!relationIds.Contains(relation.Id.Value))
{
relations.Add(relation);
relationIds.Add(relation.Id.Value);
}
}
}
// recursively add all relations containing other relations as a member.
do
{
res.AddRange(relations.Cast<OsmGeo>()); // the .Cast<> is here for Windows Phone.
List<Relation> newRelations = new List<Relation>();
foreach (OsmGeo osmGeo in relations)
{
IList<Relation> relationsFor = this.GetRelationsFor(osmGeo);
foreach (Relation relation in relationsFor)
{
if (!relationIds.Contains(relation.Id.Value))
{
newRelations.Add(relation);
relationIds.Add(relation.Id.Value);
}
}
}
relations = newRelations;
} while (relations.Count > 0);
if (filter != null)
{
List<OsmGeo> filtered = new List<OsmGeo>();
foreach (OsmGeo geo in res)
{
if (filter.Evaluate(geo))
{
filtered.Add(geo);
}
}
}
return res;
}
/// <summary>
/// Utility method for ensuring a view stays within a bounding box of geo coordinated.
/// </summary>
/// <param name="center">The map center we want to move to.</param>
/// <param name="boundingBox">A GeoCoordinateBox defining the bounding box.</param>
/// <param name="view" The current view.</param>
/// <returns>Returns a center geo coordinate that is corrected so the view stays within the bounding box.</returns>
public GeoCoordinate EnsureViewWithinBoundingBox(GeoCoordinate center, GeoCoordinateBox boundingBox, View2D view)
{
double[] mapCenterSceneCoords = this.Projection.ToPixel(center);
var toViewPort = view.CreateToViewPort(view.Width, view.Height);
double mapCenterPixelsX, mapCenterPixelsY;
toViewPort.Apply(mapCenterSceneCoords[0], mapCenterSceneCoords[1], out mapCenterPixelsX, out mapCenterPixelsY);
//double[] mapCenterPixels = view.ToViewPort(view.Width, view.Height, mapCenterSceneCoords[0], mapCenterSceneCoords[1]);
var fromViewPort = view.CreateFromViewPort(view.Height, view.Width);
double leftScene, topScene, rightScene, bottomScene;
fromViewPort.Apply(mapCenterPixelsX - (view.Width) / 2.0, mapCenterPixelsY - (view.Height) / 2.0, out leftScene, out topScene);
//double[] topLeftSceneCoordinates = view.FromViewPort(view.Width,
// view.Height,
// mapCenterPixels[0] - (view.Width) / 2.0,
// mapCenterPixels[1] - (view.Height) / 2.0);
GeoCoordinate topLeft = this.Projection.ToGeoCoordinates(leftScene, topScene);
//GeoCoordinate topLeft = this.Projection.ToGeoCoordinates(topLeftSceneCoordinates[0], topLeftSceneCoordinates[1]);
fromViewPort.Apply(mapCenterPixelsX + (view.Width) / 2.0, mapCenterPixelsY + (view.Height) / 2.0, out rightScene, out bottomScene);
//double[] bottomRightSceneCoordinates = view.FromViewPort(view.Width,
// view.Height,
// mapCenterPixels[0] + (view.Width) / 2.0,
// mapCenterPixels[1] + (view.Height) / 2.0);
GeoCoordinate bottomRight = this.Projection.ToGeoCoordinates(rightScene, bottomScene);
// Early exit when the view is inside the box.
if (boundingBox.Contains(topLeft) && boundingBox.Contains(bottomRight))
return center;
double viewNorth = topLeft.Latitude;
double viewEast = bottomRight.Longitude;
double viewSouth = bottomRight.Latitude;
double viewWest = topLeft.Longitude;
double boxNorth = boundingBox.MaxLat;
double boxEast = boundingBox.MaxLon;
double boxSouth = boundingBox.MinLat;
double boxWest = boundingBox.MinLon;
//TODO: Check if the view acrually fits the bounding box, if not resize the view.
// Correct all view bounds if neccecary.
if (viewNorth > boxNorth)
{
viewSouth -= viewNorth - boxNorth;
viewNorth = boxNorth;
}
if (viewEast > boxEast)
{
viewWest -= viewEast - boxEast;
viewEast = boxEast;
}
if (viewSouth < boxSouth)
{
viewNorth += boxSouth - viewSouth;
viewSouth = boxSouth;
}
if (viewWest < boxWest)
{
viewEast += boxWest - viewWest;
viewWest = boxWest;
}
// Compute and return corrected map center
return new GeoCoordinate(viewSouth + (viewNorth - viewSouth) / 2.0f, viewWest + (viewEast - viewWest) / 2.0f);
}
/// <summary>
/// Returns true if this point is visible inside the given bounding box.
/// </summary>
/// <returns></returns>
public override bool IsInside(GeoCoordinateBox box)
{
if (box == null) { throw new ArgumentNullException(); }
return box.Contains(this.Coordinate);
}