public static string ToQLString(this IOpenStreetMapRegion region)
{
if (region is BoundingBox)
{
BoundingBox box = region as BoundingBox;
return(string.Format("({0},{1},{2},{3});", box.South, box.West, box.North, box.East));
}
if (region is Polygon)
{
Polygon polygon = region as Polygon;
return(string.Format("(poly:{0});", polygon.ToLatLonString(" ", "'")));
}
if (region is CentreRadius)
{
//https://wiki.openstreetmap.org/wiki/Overpass_API/Overpass_QL#Relative_to_other_elements_.28around.29
CentreRadius circle = region as CentreRadius;
return(string.Format("(around:{0},{1},{2});", circle.Radius, circle.Centre.Latitude, circle.Centre.Longitude));
}
if (region is LineStringRadius)
{
//https://wiki.openstreetmap.org/wiki/Overpass_API/Overpass_QL#Relative_to_other_elements_.28around.29
LineStringRadius lineRad = region as LineStringRadius;
return(string.Format("(around:{0},{1});", lineRad.Radius, lineRad.Polygon.ToLatLonString(",", "")));
}
if (region is TaggedArea)
{
TaggedArea taggedArea = region as TaggedArea;
string keyValues = ToQLString(taggedArea.KeyValues);
return(string.Format("area{0};", keyValues));
}
return("");
}
public static QueryBuilder QueryBuilder(IOpenStreetMapRegion region, List <IOpenStreetMapElement> elements)
{
StringBuilder q = new StringBuilder();
q.Append(BaseUri());
if (region is TaggedArea)
{
q.Append(region.ToQLString());
}
q.Append("(");
q.Append(GetElementAndRegion(elements, region));
q.Append(");");
q.Append("(._;");
q.Append(">;");
q.Append(");");
q.Append("out body;");
return(new QueryBuilder()
{
QueryString = q.ToString()
});
}
/***************************************************/
private static string GetElementAndRegion(List <IOpenStreetMapElement> elements, IOpenStreetMapRegion region)
{
if (elements == null)
{
return("");
}
string elementQuery = "";
string regionQuery = "";
if (region is TaggedArea)
{
regionQuery = "(area);";
}
else
{
regionQuery = region.ToQLString();
}
foreach (IOpenStreetMapElement element in elements)
{
elementQuery += element.ToQLString() + regionQuery;
}
return(elementQuery);
}
