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Version 5.4. Reworked TileSource

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ClemensF 2020-10-23 23:35:48 +02:00
parent 5c815e951e
commit 5336d07704
22 changed files with 145 additions and 233 deletions
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172
MapControl/Shared/TileSource.cs
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@ -22,88 +22,29 @@ namespace MapControl
#endif
public class TileSource
{
private Func<int, int, int, string> getUri;
private string uriFormat;
private int subdomainIndex = -1;
public TileSource()
{
}
protected TileSource(string uriFormat)
{
this.uriFormat = uriFormat;
}
public string[] Subdomains { get; set; }
/// <summary>
/// Gets or sets the format string to produce tile Uris.
/// Gets or sets the format string to produce tile request Uris.
/// </summary>
public string UriFormat
{
get { return uriFormat; }
set
{
if (string.IsNullOrEmpty(value))
{
throw new ArgumentException("The value of the UriFormat property must not be null or empty.");
}
uriFormat = value;
if (uriFormat.Contains("{x}") && uriFormat.Contains("{z}"))
if (Subdomains == null && uriFormat.Contains("{s}"))
{
if (uriFormat.Contains("{y}"))
{
getUri = GetDefaultUri;
}
else if (uriFormat.Contains("{v}"))
{
getUri = GetTmsUri;
}
}
else if (uriFormat.Contains("{q}")) // {i} is optional
{
getUri = GetQuadKeyUri;
}
else if (uriFormat.Contains("{W}") && uriFormat.Contains("{S}") && uriFormat.Contains("{E}") && uriFormat.Contains("{N}"))
{
getUri = GetBoundingBoxUri;
}
else if (uriFormat.Contains("{w}") && uriFormat.Contains("{s}") && uriFormat.Contains("{e}") && uriFormat.Contains("{n}"))
{
getUri = GetLatLonBoundingBoxUri;
}
if (Subdomains == null && uriFormat.Contains("{c}"))
{
Subdomains = new string[] { "a", "b", "c" };
Subdomains = new string[] { "a", "b", "c" }; // default OpenStreetMap subdomains
}
}
}
/// <summary>
/// Gets the image Uri for the specified tile indices and zoom level.
/// Gets or sets an array of request subdomain names that are replaced for the {s} format specifier.
/// </summary>
public virtual Uri GetUri(int x, int y, int zoomLevel)
{
if (getUri == null)
{
return null;
}
var uri = getUri(x, y, zoomLevel);
if (Subdomains != null && Subdomains.Length > 0)
{
subdomainIndex = (subdomainIndex + 1) % Subdomains.Length;
uri = uri.Replace("{c}", Subdomains[subdomainIndex]);
}
return new Uri(uri, UriKind.RelativeOrAbsolute);
}
public string[] Subdomains { get; set; }
/// <summary>
/// Loads a tile ImageSource asynchronously from GetUri(x, y, zoomLevel).
@ -115,71 +56,62 @@ namespace MapControl
return uri != null ? ImageLoader.LoadImageAsync(uri) : Task.FromResult((ImageSource)null);
}
private string GetDefaultUri(int x, int y, int zoomLevel)
/// <summary>
/// Gets the image Uri for the specified tile indices and zoom level.
/// </summary>
public virtual Uri GetUri(int x, int y, int zoomLevel)
{
return uriFormat
.Replace("{x}", x.ToString())
.Replace("{y}", y.ToString())
.Replace("{z}", zoomLevel.ToString());
}
Uri uri = null;
private string GetTmsUri(int x, int y, int zoomLevel)
{
y = (1 << zoomLevel) - 1 - y;
return uriFormat
.Replace("{x}", x.ToString())
.Replace("{v}", y.ToString())
.Replace("{z}", zoomLevel.ToString());
}
private string GetQuadKeyUri(int x, int y, int zoomLevel)
{
if (zoomLevel < 1)
if (UriFormat != null)
{
return null;
var uriString = UriFormat
.Replace("{x}", x.ToString())
.Replace("{y}", y.ToString())
.Replace("{z}", zoomLevel.ToString());
if (Subdomains != null && Subdomains.Length > 0)
{
uriString = uriString.Replace("{s}", Subdomains[(x + y) % Subdomains.Length]);
}
uri = new Uri(uriString, UriKind.RelativeOrAbsolute);
}
var quadkey = new char[zoomLevel];
return uri;
}
}
for (var z = zoomLevel - 1; z >= 0; z--, x /= 2, y /= 2)
public class TmsTileSource : TileSource
{
public override Uri GetUri(int x, int y, int zoomLevel)
{
return base.GetUri(x, (1 << zoomLevel) - 1 - y, zoomLevel);
}
}
public class BoundingBoxTileSource : TileSource
{
public override Uri GetUri(int x, int y, int zoomLevel)
{
Uri uri = null;
if (UriFormat != null)
{
quadkey[z] = (char)('0' + 2 * (y % 2) + (x % 2));
var tileSize = 360d / (1 << zoomLevel); // tile width in degrees
var west = MapProjection.Wgs84MetersPerDegree * (x * tileSize - 180d);
var east = MapProjection.Wgs84MetersPerDegree * ((x + 1) * tileSize - 180d);
var south = MapProjection.Wgs84MetersPerDegree * (180d - (y + 1) * tileSize);
var north = MapProjection.Wgs84MetersPerDegree * (180d - y * tileSize);
uri = new Uri(UriFormat
.Replace("{west}", west.ToString(CultureInfo.InvariantCulture))
.Replace("{south}", south.ToString(CultureInfo.InvariantCulture))
.Replace("{east}", east.ToString(CultureInfo.InvariantCulture))
.Replace("{north}", north.ToString(CultureInfo.InvariantCulture)));
}
return uriFormat
.Replace("{i}", new string(quadkey, zoomLevel - 1, 1))
.Replace("{q}", new string(quadkey));
}
private string GetBoundingBoxUri(int x, int y, int zoomLevel)
{
var tileSize = 360d / (1 << zoomLevel); // tile width in degrees
var west = MapProjection.Wgs84MetersPerDegree * (x * tileSize - 180d);
var east = MapProjection.Wgs84MetersPerDegree * ((x + 1) * tileSize - 180d);
var south = MapProjection.Wgs84MetersPerDegree * (180d - (y + 1) * tileSize);
var north = MapProjection.Wgs84MetersPerDegree * (180d - y * tileSize);
return uriFormat
.Replace("{W}", west.ToString(CultureInfo.InvariantCulture))
.Replace("{S}", south.ToString(CultureInfo.InvariantCulture))
.Replace("{E}", east.ToString(CultureInfo.InvariantCulture))
.Replace("{N}", north.ToString(CultureInfo.InvariantCulture));
}
private string GetLatLonBoundingBoxUri(int x, int y, int zoomLevel)
{
var tileSize = 360d / (1 << zoomLevel); // tile width in degrees
var west = x * tileSize - 180d;
var east = (x + 1) * tileSize - 180d;
var south = WebMercatorProjection.YToLatitude(180d - (y + 1) * tileSize);
var north = WebMercatorProjection.YToLatitude(180d - y * tileSize);
return uriFormat
.Replace("{w}", west.ToString(CultureInfo.InvariantCulture))
.Replace("{s}", south.ToString(CultureInfo.InvariantCulture))
.Replace("{e}", east.ToString(CultureInfo.InvariantCulture))
.Replace("{n}", north.ToString(CultureInfo.InvariantCulture));
return uri;
}
}
}