ClemensFischer/XAML-Map-Control
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Avoid unnecessary Location and Point allocations

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ClemensFischer 2025-12-12 21:28:45 +01:00
parent f44d2207e5
commit e268be2948
20 changed files with 205 additions and 172 deletions
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32
MapControl/Shared/MapBase.cs
View file

@ -176,6 +176,15 @@ namespace MapControl
/// </summary>
public ViewTransform ViewTransform { get; } = new ViewTransform();
/// <summary>
/// Gets the map scale as horizontal and vertical scaling factors from meters to
/// view coordinates at the specified geographic coordinates.
/// </summary>
public Point GetScale(double latitude, double longitude)
{
return ViewTransform.GetMapScale(MapProjection.GetRelativeScale(latitude, longitude));
}
/// <summary>
/// Gets the map scale as horizontal and vertical scaling factors from meters to
/// view coordinates at the specified location.
@ -187,7 +196,7 @@ namespace MapControl
/// <summary>
/// Gets a transform Matrix from meters to view coordinates for scaling and rotating
/// objects that are anchored at a Location.
/// objects that are anchored at the specified Location.
/// </summary>
public Matrix GetMapTransform(Location location)
{
@ -195,11 +204,11 @@ namespace MapControl
}
/// <summary>
/// Transforms a Location in geographic coordinates to a Point in view coordinates.
/// Transforms geographic coordinates to a Point in view coordinates.
/// </summary>
public Point? LocationToView(Location location)
public Point? LocationToView(double latitude, double longitude)
{
var point = MapProjection.LocationToMap(location);
var point = MapProjection.LocationToMap(latitude, longitude);
if (point.HasValue)
{
@ -209,6 +218,14 @@ namespace MapControl
return point;
}
/// <summary>
/// Transforms a Location in geographic coordinates to a Point in view coordinates.
/// </summary>
public Point? LocationToView(Location location)
{
return LocationToView(location.Latitude, location.Longitude);
}
/// <summary>
/// Transforms a Point in view coordinates to a Location in geographic coordinates.
/// </summary>
@ -343,8 +360,9 @@ namespace MapControl
if (mapRect.HasValue)
{
var rectCenter = new Point(mapRect.Value.X + mapRect.Value.Width / 2d, mapRect.Value.Y + mapRect.Value.Height / 2d);
var targetCenter = MapProjection.MapToLocation(rectCenter);
var targetCenter = MapProjection.MapToLocation(
mapRect.Value.X + mapRect.Value.Width / 2d,
mapRect.Value.Y + mapRect.Value.Height / 2d);
if (targetCenter != null)
{
@ -428,7 +446,7 @@ namespace MapControl
if (projection.Type <= MapProjectionType.NormalCylindrical)
{
var maxLocation = projection.MapToLocation(new Point(0d, 180d * MapProjection.Wgs84MeterPerDegree));
var maxLocation = projection.MapToLocation(0d, 180d * MapProjection.Wgs84MeterPerDegree);
if (maxLocation != null && maxLocation.Latitude < 90d)
{