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c#uwpantialiasinguwp-maps

Where is UWP MapControl antialiasing property?

I work with UWP MapControl and adding some MapPolylines. And they looks ugly (see pic below) enter image description here

I assume should be kind of antialiasing property but cannot find it here.

Please help and thank you!

C#

var mapPolyline = new MapPolyline();
var geoPositions = new List<BasicGeoposition>();
foreach (var vertex in polyLine.Vertex)
{
  // adding BasicGeopositions...
};
mapPolyline.StrokeColor = Colors.Black;
mapPolyline.StrokeThickness = 1;
mapPolyline.Path = new Geopath(geoPositions);
((MapElementsLayer)impotMapLayer).MapElements.Add(mapPolyline);

UPDATE #1 based on the answer

I have investigated this article "Overlay tiled images on a map" and also this one "MapTileBitmapRequestedEventArgs Class" and cannot get the clear definition of the X and Y of "MapTileBitmapRequestedEventArgs Class"

The article says

X   Gets the X value of the requested tile.
Y   Gets the Y value of the requested tile.

Using MSDN example from here I get following log for X, Y, Zoom

X 6073  Y 2617 Zoom 13
X 6072  Y 2616 Zoom 13
X 6071  Y 2615 Zoom 13
X 6071  Y 2617 Zoom 13
X 6072  Y 2614 Zoom 13
X 6073  Y 2615 Zoom 13
X 6071  Y 2616 Zoom 13
X 6073  Y 2614 Zoom 13
X 6072  Y 2615 Zoom 13
    
    and etc

Would you mind clarify what those numbers are exactly and how I can associate it with geolocations set of vertices in memory if I want create tile-image only, please? (My polylines set already calculated in geopoints.)

Thank you very much!

UPDATE #2 Here is the solution

First of all I read this article https://learn.microsoft.com/en-us/bingmaps/articles/bing-maps-tile-system?redirectedfrom=MSDN

So we need TileSystem to make series of convertions

namespace Microsoft.MapPoint 
{  
    static class TileSystem  
...

The X and Y of MapTileBitmapRequestedEventArgs are Tile's XY we have to pass to TileSystem.TileXYToPixelXY(args.X, args.Y, out int pixelX, out int pixelY);

The final code is following based on https://learn.microsoft.com/en-us/windows/uwp/maps-and-location/overlay-tiled-images

private async void customDataSource_BitmapRequestedAsync(CustomMapTileDataSource sender, MapTileBitmapRequestedEventArgs args)
{
    var deferral = args.Request.GetDeferral();
             
            
    TileSystem.TileXYToPixelXY(args.X, args.Y, out int pixelX, out int pixelY);
                    
    TileSystem.PixelXYToLatLong(pixelX, pixelY,  args.ZoomLevel, out double  lat, out double lng);
    
    Debug.WriteLine($"lat {lat}  lng {lng} Zoom {args.ZoomLevel}");
    
    // next step is to extract from my custom array polylines accroding to   TileSystem.PixelXYToLatLong

    // and finally pass it inside of CreateBitmapAsStreamAsync(array to draw);
    
    args.Request.PixelData = await CreateBitmapAsStreamAsync(array to draw);
                         
    deferral.Complete();
}
Solution

  • Currently MapPolylines are drawn without antialiasing and there is no setting to change that behavior. Looking at your screenshot, you may be better served by using a custom tile layer. See CustoMapTileDatasource here: https://learn.microsoft.com/en-us/windows/uwp/maps-and-location/overlay-tiled-images You can draw each tile in a callback using whatever method you like including antialiasing. It will also tend to perform better for a large collection of static lines like the topographic contours in your example