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Rework Map/WmsImageLayer

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This commit is contained in:
ClemensFischer 2022-11-30 17:59:38 +01:00
parent c3e1ffd685
commit 9db1987ee5
7 changed files with 265 additions and 103 deletions
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112
MapControl/Shared/WmsImageLayer.cs
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@ -134,44 +134,17 @@ namespace MapControl
return element;
}
/// <summary>
/// Loads an XElement from the URL returned by GetFeatureInfoRequestUri().
/// </summary>
public async Task<XElement> GetFeatureInfoAsync(Point position)
{
XElement element = null;
if (ServiceUri != null)
{
var uri = GetFeatureInfoRequestUri(position, "text/xml");
if (!string.IsNullOrEmpty(uri))
{
try
{
using (var stream = await ImageLoader.HttpClient.GetStreamAsync(uri))
{
element = XDocument.Load(stream).Root;
}
}
catch (Exception ex)
{
Debug.WriteLine($"WmsImageLayer: {uri}: {ex.Message}");
}
}
}
return element;
}
/// <summary>
/// Gets a response string from the URL returned by GetFeatureInfoRequestUri().
/// </summary>
public async Task<string> GetFeatureInfoTextAsync(Point position, string format = "text/plain")
public async Task<string> GetFeatureInfoAsync(Point position, string format = "text/plain")
{
string response = null;
if (ServiceUri != null)
if (ServiceUri != null &&
ParentMap?.MapProjection != null &&
ParentMap.RenderSize.Width > 0d &&
ParentMap.RenderSize.Height > 0d)
{
var uri = GetFeatureInfoRequestUri(position, format);
@ -194,11 +167,11 @@ namespace MapControl
/// <summary>
/// Loads an ImageSource from the URL returned by GetMapRequestUri().
/// </summary>
protected override async Task<ImageSource> GetImageAsync(IProgress<double> progress)
protected override async Task<ImageSource> GetImageAsync(BoundingBox boundingBox, IProgress<double> progress)
{
ImageSource image = null;
if (ServiceUri != null)
if (ServiceUri != null && ParentMap?.MapProjection != null)
{
if (Layers == null &&
ServiceUri.ToString().IndexOf("LAYERS=", StringComparison.OrdinalIgnoreCase) < 0)
@ -206,11 +179,38 @@ namespace MapControl
Layers = (await GetLayerNamesAsync())?.FirstOrDefault() ?? ""; // get first Layer from Capabilities
}
var uri = GetMapRequestUri();
if (!string.IsNullOrEmpty(uri))
if (boundingBox.West >= -180d && boundingBox.East <= 180d ||
ParentMap.MapProjection.Type > MapProjectionType.NormalCylindrical)
{
image = await ImageLoader.LoadImageAsync(new Uri(uri), progress);
var uri = CreateUri(GetMapRequestUri(boundingBox));
if (uri != null)
{
image = await ImageLoader.LoadImageAsync(uri, progress);
}
}
else
{
BoundingBox bbox1, bbox2;
if (boundingBox.West < -180d)
{
bbox1 = new BoundingBox(boundingBox.South, boundingBox.West + 360, boundingBox.North, 180d);
bbox2 = new BoundingBox(boundingBox.South, -180d, boundingBox.North, boundingBox.East);
}
else
{
bbox1 = new BoundingBox(boundingBox.South, boundingBox.West, boundingBox.North, 180d);
bbox2 = new BoundingBox(boundingBox.South, -180d, boundingBox.North, boundingBox.East - 360d);
}
var uri1 = CreateUri(GetMapRequestUri(bbox1));
var uri2 = CreateUri(GetMapRequestUri(bbox2));
if (uri1 != null && uri2 != null)
{
image = await ImageLoader.LoadMergedImageAsync(uri1, uri2, progress);
}
}
}
@ -233,14 +233,9 @@ namespace MapControl
/// <summary>
/// Returns a GetMap request URL string.
/// </summary>
protected virtual string GetMapRequestUri()
protected virtual string GetMapRequestUri(BoundingBox boundingBox)
{
if (ParentMap?.MapProjection == null)
{
return null;
}
var mapRect = ParentMap.MapProjection.BoundingBoxToRect(BoundingBox);
var mapRect = ParentMap.MapProjection.BoundingBoxToRect(boundingBox);
var viewScale = ParentMap.ViewTransform.Scale;
return GetRequestUri(new Dictionary<string, string>
@ -263,14 +258,10 @@ namespace MapControl
/// </summary>
protected virtual string GetFeatureInfoRequestUri(Point position, string format)
{
if (ParentMap?.MapProjection == null)
{
return null;
}
var mapRect = ParentMap.MapProjection.BoundingBoxToRect(BoundingBox);
var viewRect = GetViewRect(mapRect);
var viewSize = ParentMap.RenderSize;
var boundingBox = ParentMap.ViewRectToBoundingBox(new Rect(0d, 0d, viewSize.Width, viewSize.Height));
var mapRect = ParentMap.MapProjection.BoundingBoxToRect(boundingBox);
var viewRect = GetViewRect(mapRect);
var transform = new Matrix(1, 0, 0, 1, -viewSize.Width / 2, -viewSize.Height / 2);
transform.Rotate(-viewRect.Rotation);
@ -326,5 +317,22 @@ namespace MapControl
return uri.Replace(" ", "%20");
}
private static Uri CreateUri(string uri)
{
if (!string.IsNullOrEmpty(uri))
{
try
{
return new Uri(uri, UriKind.RelativeOrAbsolute);
}
catch (Exception ex)
{
Debug.WriteLine($"WmsImageLayer: {uri}: {ex.Message}");
}
}
return null;
}
}
}