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117 lines
3.1 KiB
117 lines
3.1 KiB
//-----------------------------------------------------------------------
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// <copyright file="CanonicalTileId.cs" company="Mapbox">
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// Copyright (c) 2016 Mapbox. All rights reserved.
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// </copyright>
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//-----------------------------------------------------------------------
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namespace Mapbox.Map
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{
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using System;
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using Mapbox.Utils;
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/// <summary>
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/// Data type to store <see href="https://en.wikipedia.org/wiki/Web_Mercator"> Web Mercator</see> tile scheme.
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/// <see href="http://www.maptiler.org/google-maps-coordinates-tile-bounds-projection/"> See tile IDs in action. </see>
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/// </summary>
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public struct CanonicalTileId : IEquatable<CanonicalTileId>
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{
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/// <summary> The zoom level. </summary>
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public readonly int Z;
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/// <summary> The X coordinate in the tile grid. </summary>
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public readonly int X;
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/// <summary> The Y coordinate in the tile grid. </summary>
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public readonly int Y;
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/// <summary>
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/// Initializes a new instance of the <see cref="CanonicalTileId"/> struct,
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/// representing a tile coordinate in a slippy map.
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/// </summary>
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/// <param name="z"> The z coordinate or the zoom level. </param>
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/// <param name="x"> The x coordinate. </param>
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/// <param name="y"> The y coordinate. </param>
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public CanonicalTileId(int z, int x, int y)
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{
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this.Z = z;
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this.X = x;
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this.Y = y;
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}
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internal CanonicalTileId(UnwrappedTileId unwrapped)
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{
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var z = unwrapped.Z;
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var x = unwrapped.X;
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var y = unwrapped.Y;
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var wrap = (x < 0 ? x - (1 << z) + 1 : x) / (1 << z);
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this.Z = z;
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this.X = x - wrap * (1 << z);
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this.Y = y < 0 ? 0 : Math.Min(y, (1 << z) - 1);
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}
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/// <summary>
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/// Get the cordinate at the top left of corner of the tile.
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/// </summary>
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/// <returns> The coordinate. </returns>
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public Vector2d ToVector2d()
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{
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double n = Math.PI - ((2.0 * Math.PI * this.Y) / Math.Pow(2.0, this.Z));
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double lat = 180.0 / Math.PI * Math.Atan(Math.Sinh(n));
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double lng = (this.X / Math.Pow(2.0, this.Z) * 360.0) - 180.0;
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// FIXME: Super hack because of rounding issues.
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return new Vector2d(lat - 0.0001, lng + 0.0001);
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}
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/// <summary>
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/// Returns a <see cref="T:System.String"/> that represents the current
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/// <see cref="T:Mapbox.Map.CanonicalTileId"/>.
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/// </summary>
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/// <returns>
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/// A <see cref="T:System.String"/> that represents the current
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/// <see cref="T:Mapbox.Map.CanonicalTileId"/>.
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/// </returns>
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public override string ToString()
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{
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return this.Z + "/" + this.X + "/" + this.Y;
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}
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#region Equality
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public bool Equals(CanonicalTileId other)
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{
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return this.X == other.X && this.Y == other.Y && this.Z == other.Z;
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}
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public override int GetHashCode()
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{
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return X ^ Y ^ Z;
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}
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public static bool operator ==(CanonicalTileId a, CanonicalTileId b)
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{
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return a.X == b.X && a.Y == b.Y && a.Z == b.Z;
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}
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public static bool operator !=(CanonicalTileId a, CanonicalTileId b)
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{
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return !(a == b);
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}
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public override bool Equals(object obj)
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{
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if (obj is CanonicalTileId)
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{
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return this.Equals((CanonicalTileId)obj);
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}
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else
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{
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return false;
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}
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}
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#endregion
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}
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}
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