ClemensFischer/XAML-Map-Control
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Update MapTileLayer.cs

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This commit is contained in:
Clemens 2022-04-24 19:34:02 +02:00
parent d6f8fd6513
commit 7c5eb04c9e
1 changed files with 16 additions and 3 deletions
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19
MapControl/Shared/MapTileLayer.cs
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@ -26,9 +26,9 @@ namespace MapControl
/// </summary>
public class MapTileLayer : MapTileLayerBase
{
public const int TileSize = 256;
private const int TileSize = 256;
public static readonly Point MapTopLeft = new Point(
private static readonly Point MapTopLeft = new Point(
-180d * MapProjection.Wgs84MeterPerDegree, 180d * MapProjection.Wgs84MeterPerDegree);
/// <summary>
@ -53,6 +53,9 @@ namespace MapControl
public static readonly DependencyProperty MaxZoomLevelProperty = DependencyProperty.Register(
nameof(MaxZoomLevel), typeof(int), typeof(MapTileLayer), new PropertyMetadata(19));
public static readonly DependencyProperty ZoomLevelOffsetProperty = DependencyProperty.Register(
nameof(ZoomLevelOffset), typeof(double), typeof(MapTileLayer), new PropertyMetadata(0d));
public MapTileLayer()
: this(new TileImageLoader())
{
@ -85,6 +88,16 @@ namespace MapControl
set { SetValue(MaxZoomLevelProperty, value); }
}
/// <summary>
/// Optional offset between the map zoom level and the topmost tile zoom level.
/// Default value is 0.
/// </summary>
public double ZoomLevelOffset
{
get { return (double)GetValue(ZoomLevelOffsetProperty); }
set { SetValue(ZoomLevelOffsetProperty, value); }
}
protected override Size MeasureOverride(Size availableSize)
{
availableSize = new Size(double.PositiveInfinity, double.PositiveInfinity);
@ -167,7 +180,7 @@ namespace MapControl
private bool SetTileMatrix()
{
var tileMatrixZoomLevel = (int)Math.Floor(ParentMap.ZoomLevel + 0.001); // avoid rounding issues
var tileMatrixZoomLevel = (int)Math.Floor(ParentMap.ZoomLevel - ZoomLevelOffset + 0.001); // avoid rounding issues
var tileMatrixScale = ViewTransform.ZoomLevelToScale(tileMatrixZoomLevel);