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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47
MapControl/Shared/MapProjection.cs
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@ -55,21 +55,38 @@ namespace MapControl
public virtual Location Center { get; protected internal set; } = new Location();
/// <summary>
/// Gets the relative map scale at the specified Location.
/// Gets the relative map scale at the specified geographic coordinates.
/// </summary>
public virtual Point GetRelativeScale(Location location) => new Point(1d, 1d);
public virtual Point GetRelativeScale(double latitude, double longitude) => new Point(1d, 1d);
/// <summary>
/// Transforms geographic coordinates to a Point in projected map coordinates.
/// Returns null when the location can not be transformed.
/// </summary>
public abstract Point? LocationToMap(double latitude, double longitude);
/// <summary>
/// Transforms projected map coordinates to a Location in geographic coordinates.
/// Returns null when the coordinates can not be transformed.
/// </summary>
public abstract Location MapToLocation(double x, double y);
/// <summary>
/// Gets the relative map scale at the specified geographic Location.
/// </summary>
public Point GetRelativeScale(Location location) => GetRelativeScale(location.Latitude, location.Longitude);
/// <summary>
/// Transforms a Location in geographic coordinates to a Point in projected map coordinates.
/// Returns null when the Location can not be transformed.
/// </summary>
public abstract Point? LocationToMap(Location location);
public Point? LocationToMap(Location location) => LocationToMap(location.Latitude, location.Longitude);
/// <summary>
/// Transforms a Point in projected map coordinates to a Location in geographic coordinates.
/// Returns null when the Point can not be transformed.
/// </summary>
public abstract Location MapToLocation(Point point);
public Location MapToLocation(Point point) => MapToLocation(point.X, point.Y);
/// <summary>
/// Transforms a BoundingBox in geographic coordinates to a Rect in projected map coordinates.
@ -78,9 +95,8 @@ namespace MapControl
public virtual Rect? BoundingBoxToMap(BoundingBox boundingBox)
{
Rect? rect = null;
var southWest = LocationToMap(new Location(boundingBox.South, boundingBox.West));
var northEast = LocationToMap(new Location(boundingBox.North, boundingBox.East));
var southWest = LocationToMap(boundingBox.South, boundingBox.West);
var northEast = LocationToMap(boundingBox.North, boundingBox.East);
if (southWest.HasValue && northEast.HasValue)
{
@ -97,8 +113,8 @@ namespace MapControl
public virtual BoundingBox MapToBoundingBox(Rect rect)
{
BoundingBox boundingBox = null;
var southWest = MapToLocation(new Point(rect.X, rect.Y));
var northEast = MapToLocation(new Point(rect.X + rect.Width, rect.Y + rect.Height));
var southWest = MapToLocation(rect.X, rect.Y);
var northEast = MapToLocation(rect.X + rect.Width, rect.Y + rect.Height);
if (southWest != null && northEast != null)
{
@ -116,13 +132,14 @@ namespace MapControl
{
Tuple<Rect, double> rotatedRect = null;
Point? center, north, south, west, east;
var boxCenter = latLonBox.Center;
var centerLatitude = latLonBox.Center.Latitude;
var centerLongitude = latLonBox.Center.Longitude;
if ((center = LocationToMap(boxCenter)).HasValue &&
(north = LocationToMap(new Location(latLonBox.North, boxCenter.Longitude))).HasValue &&
(south = LocationToMap(new Location(latLonBox.South, boxCenter.Longitude))).HasValue &&
(west = LocationToMap(new Location(boxCenter.Latitude, latLonBox.West))).HasValue &&
(east = LocationToMap(new Location(boxCenter.Latitude, latLonBox.East))).HasValue)
if ((center = LocationToMap(centerLatitude, centerLongitude)).HasValue &&
(north = LocationToMap(latLonBox.North, centerLongitude)).HasValue &&
(south = LocationToMap(latLonBox.South, centerLongitude)).HasValue &&
(west = LocationToMap(centerLatitude, latLonBox.West)).HasValue &&
(east = LocationToMap(centerLatitude, latLonBox.East)).HasValue)
{
var dx1 = east.Value.X - west.Value.X;
var dy1 = east.Value.Y - west.Value.Y;