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34 lines
1 KiB
C#
34 lines
1 KiB
C#
// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
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// © 2018 Clemens Fischer
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// Licensed under the Microsoft Public License (Ms-PL)
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using System;
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#if !WINDOWS_UWP
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using System.Windows;
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#endif
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using ProjNet.CoordinateSystems;
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namespace MapControl.Projections
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{
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/// <summary>
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/// Spherical Mercator Projection implemented by setting the CoordinateSystem property of a GeoApiProjection.
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/// See "Map Projections - A Working Manual" (https://pubs.usgs.gov/pp/1395/report.pdf), p.41-44.
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/// </summary>
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public class WebMercatorProjection : GeoApiProjection
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{
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public WebMercatorProjection()
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{
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IsWebMercator = true;
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IsNormalCylindrical = true;
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CoordinateSystem = ProjectedCoordinateSystem.WebMercator;
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}
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public override Vector GetMapScale(Location location)
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{
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var k = 1d / Math.Cos(location.Latitude * Math.PI / 180d); // p.44 (7-3)
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return new Vector(ViewportScale * k, ViewportScale * k);
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}
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}
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}
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