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Added WMS GetFeatureInfo support

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This commit is contained in:
ClemensF 2020-07-13 17:48:06 +02:00
parent cd3c8585c9
commit 0d70887d37
8 changed files with 111 additions and 25 deletions
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1
MapControl/Shared/MapScale.cs
View file

@ -37,7 +37,6 @@ namespace MapControl
public MapScale()
{
IsHitTestVisible = false;
MinWidth = 100d;
line.SetBinding(Shape.StrokeProperty, GetBinding(StrokeProperty, nameof(Stroke)));

1
MapControl/Shared/MapTileLayerBase.cs
View file

@ -54,7 +54,6 @@ namespace MapControl
protected MapTileLayerBase(ITileImageLoader tileImageLoader)
{
IsHitTestVisible = false;
RenderTransform = new MatrixTransform();
TileImageLoader = tileImageLoader;

125
MapControl/Shared/WmsImageLayer.cs
View file

@ -64,27 +64,21 @@ namespace MapControl
}
/// <summary>
/// Gets a list of all layer names returned by a GetCapabilities response.
/// Calls GetCapabilitiesRequestUri() and asynchronously loads an XElement from the returned URL.
/// </summary>
public async Task<IEnumerable<string>> GetLayerNamesAsync()
public async Task<XElement> GetCapabilitiesAsync()
{
IEnumerable<string> layerNames = null;
XElement element = null;
if (ServiceUri != null)
{
var uri = GetRequestUri("GetCapabilities").Replace(" ", "%20");
var uri = GetCapabilitiesRequestUri();
try
{
using (var stream = await ImageLoader.HttpClient.GetStreamAsync(uri))
{
var capabilities = XDocument.Load(stream).Root;
var ns = capabilities.Name.Namespace;
layerNames = capabilities
.Descendants(ns + "Layer")
.Select(e => e.Element(ns + "Name")?.Value)
.Where(n => !string.IsNullOrEmpty(n));
element = XDocument.Load(stream).Root;
}
}
catch (Exception ex)
@ -93,11 +87,60 @@ namespace MapControl
}
}
return element;
}
/// <summary>
/// Calls GetFeatureInfoRequestUri() and asynchronously loads an XElement from the returned URL.
/// </summary>
public async Task<XElement> GetFeatureInfoAsync(Point position)
{
XElement element = null;
if (ServiceUri != null)
{
var uri = GetFeatureInfoRequestUri(position);
try
{
using (var stream = await ImageLoader.HttpClient.GetStreamAsync(uri))
{
element = XDocument.Load(stream).Root;
}
}
catch (Exception ex)
{
Debug.WriteLine("WmsImageLayer: {0}: {1}", uri, ex.Message);
}
}
return element;
}
/// <summary>
/// Gets a list of all layer names returned by a GetCapabilities response.
/// </summary>
public async Task<IEnumerable<string>> GetLayerNamesAsync()
{
IEnumerable<string> layerNames = null;
var capabilities = await GetCapabilitiesAsync();
if (capabilities != null)
{
var ns = capabilities.Name.Namespace;
layerNames = capabilities
.Descendants(ns + "Layer")
.Select(e => e.Element(ns + "Name")?.Value)
.Where(n => !string.IsNullOrEmpty(n));
}
return layerNames;
}
/// <summary>
/// Calls GetImageUri() and asynchronously loads an ImageSource from the returned GetMap URL.
/// Calls GetMapRequestUri() and asynchronously loads an ImageSource from the returned URL.
/// </summary>
protected override async Task<ImageSource> GetImageAsync()
{
@ -111,21 +154,29 @@ namespace MapControl
Layers = (await GetLayerNamesAsync())?.FirstOrDefault() ?? ""; // get first Layer from Capabilities
}
var uri = GetImageUri();
var uri = GetMapRequestUri();
if (!string.IsNullOrEmpty(uri))
{
image = await ImageLoader.LoadImageAsync(new Uri(uri.Replace(" ", "%20")));
image = await ImageLoader.LoadImageAsync(new Uri(uri));
}
}
return image;
}
/// <summary>
/// Returns a GetCapabilities request URL string.
/// </summary>
protected virtual string GetCapabilitiesRequestUri()
{
return GetRequestUri("GetCapabilities").Replace(" ", "%20");
}
/// <summary>
/// Returns a GetMap request URL string.
/// </summary>
protected virtual string GetImageUri()
protected virtual string GetMapRequestUri()
{
string uri = null;
var projection = ParentMap?.MapProjection;
@ -157,7 +208,49 @@ namespace MapControl
uri += "&HEIGHT=" + (int)Math.Round(ParentMap.ViewTransform.Scale * rect.Height);
}
return uri;
return uri.Replace(" ", "%20");
}
/// <summary>
/// Returns a GetFeatureInfo request URL string.
/// </summary>
protected virtual string GetFeatureInfoRequestUri(Point position)
{
string uri = null;
var projection = ParentMap?.MapProjection;
if (projection != null && !string.IsNullOrEmpty(projection.CrsId))
{
uri = GetRequestUri("GetFeatureInfo");
var i = uri.IndexOf("LAYERS=", StringComparison.OrdinalIgnoreCase);
if (i >= 0)
{
i += 7;
var j = uri.IndexOf('&', i);
var layers = j >= i ? uri.Substring(i, j - i) : uri.Substring(i);
uri += "&QUERY_LAYERS=" + layers;
}
else if (Layers != null)
{
uri += "&LAYERS=" + Layers;
uri += "&QUERY_LAYERS=" + Layers;
}
var rect = projection.BoundingBoxToRect(BoundingBox);
var pos = ParentMap.TransformToVisual(Children[1]).Transform(position); // top Image element
uri += "&CRS=" + projection.GetCrsValue();
uri += "&BBOX=" + projection.GetBboxValue(rect);
uri += "&WIDTH=" + (int)Math.Round(ParentMap.ViewTransform.Scale * rect.Width);
uri += "&HEIGHT=" + (int)Math.Round(ParentMap.ViewTransform.Scale * rect.Height);
uri += "&I=" + (int)Math.Round(pos.X);
uri += "&J=" + (int)Math.Round(pos.Y);
uri += "&INFO_FORMAT=text/xml";
}
return uri.Replace(" ", "%20");
}
private string GetRequestUri(string request)

2
MapControl/Shared/WmtsTileLayer.cs
View file

@ -35,8 +35,6 @@ namespace MapControl
public WmtsTileLayer(ITileImageLoader tileImageLoader)
: base(tileImageLoader)
{
IsHitTestVisible = false;
Loaded += OnLoaded;
}

1
MapControl/Shared/WmtsTileMatrixLayer.cs
View file

@ -21,7 +21,6 @@ namespace MapControl
{
public WmtsTileMatrixLayer(WmtsTileMatrix tileMatrix, int zoomLevel)
{
IsHitTestVisible = false;
RenderTransform = new MatrixTransform();
TileMatrix = tileMatrix;
ZoomLevel = zoomLevel;

1
MapControl/UWP/MapGraticule.UWP.cs
View file

@ -16,7 +16,6 @@ namespace MapControl
public MapGraticule()
{
IsHitTestVisible = false;
StrokeThickness = 0.5;
}

1
MapControl/WPF/MapGraticule.WPF.cs
View file

@ -26,7 +26,6 @@ namespace MapControl
static MapGraticule()
{
IsHitTestVisibleProperty.OverrideMetadata(typeof(MapGraticule), new FrameworkPropertyMetadata(false));
StrokeThicknessProperty.OverrideMetadata(typeof(MapGraticule), new FrameworkPropertyMetadata(0.5));
}

4
SampleApps/Shared/MapLayers.cs
View file

@ -195,9 +195,9 @@ namespace ViewModel
MaxBoundingBoxWidth = 360;
}
protected override string GetImageUri()
protected override string GetMapRequestUri()
{
return base.GetImageUri()
return base.GetMapRequestUri()
.Replace("&CRS=AUTO2:97001,", "&CRS=AUTO2:7CS01,")
.Replace("&CRS=AUTO2:97002,", "&CRS=AUTO2:7CS02,");
}