ClemensFischer/XAML-Map-Control
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Version 4.4.0: Fixed MapPolyline performance on UWP. Added MapPolygon and MapMultiPolygon for WPF.

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ClemensF 2018-02-09 17:43:47 +01:00
parent cce5d6e0b4
commit d1552506f6
80 changed files with 673 additions and 550 deletions
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23
MapControl/Shared/WorldMercatorProjection.cs
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@ -1,5 +1,5 @@
// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
// © 2017 Clemens Fischer
// © 2018 Clemens Fischer
// Licensed under the Microsoft Public License (Ms-PL)
using System;
@ -13,12 +13,15 @@ namespace MapControl
{
/// <summary>
/// Transforms map coordinates according to the "World Mercator" Projection, EPSG:3395.
/// Longitude values are transformed linearly to X values in meters, by multiplying with MetersPerDegree.
/// Longitude values are transformed linearly to X values in meters, by multiplying with TrueScale.
/// Latitude values are transformed according to the elliptical versions of the Mercator equations,
/// as shown in "Map Projections - A Working Manual" (https://pubs.usgs.gov/pp/1395/report.pdf), p.44.
/// </summary>
public class WorldMercatorProjection : MapProjection
{
public const double Wgs84Flattening = 1d / 298.257223563;
public static readonly double Wgs84Eccentricity = Math.Sqrt((2d - Wgs84Flattening) * Wgs84Flattening);
public static double MinLatitudeDelta = 1d / Wgs84EquatorialRadius; // corresponds to 1 meter
public static int MaxIterations = 10;
@ -30,15 +33,9 @@ namespace MapControl
public WorldMercatorProjection(string crsId)
{
CrsId = crsId;
LongitudeScale = MetersPerDegree;
MaxLatitude = YToLatitude(180d);
}
public override double GetViewportScale(double zoomLevel)
{
return DegreesToViewportScale(zoomLevel) / MetersPerDegree;
}
public override Point GetMapScale(Location location)
{
var lat = location.Latitude * Math.PI / 180d;
@ -51,20 +48,20 @@ namespace MapControl
public override Point LocationToPoint(Location location)
{
return new Point(
MetersPerDegree * location.Longitude,
MetersPerDegree * LatitudeToY(location.Latitude));
TrueScale * location.Longitude,
TrueScale * LatitudeToY(location.Latitude));
}
public override Location PointToLocation(Point point)
{
return new Location(
YToLatitude(point.Y / MetersPerDegree),
point.X / MetersPerDegree);
YToLatitude(point.Y / TrueScale),
point.X / TrueScale);
}
public override Location TranslateLocation(Location location, Point translation)
{
var scaleX = MetersPerDegree * ViewportScale;
var scaleX = TrueScale * ViewportScale;
var scaleY = scaleX / Math.Cos(location.Latitude * Math.PI / 180d);
return new Location(