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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2498 | - | 1 | |
| 2 | namespace GMap.NET.Projections |
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| 3 | { |
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| 4 | using System; |
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| 5 | |||
| 6 | /// <summary> |
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| 7 | /// Plate Carrée (literally, “plane square”) projection |
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| 8 | /// PROJCS["WGS 84 / World Equidistant Cylindrical",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],UNIT["Meter",1]] |
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| 9 | /// </summary> |
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| 10 | public class PlateCarreeProjection : PureProjection |
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| 11 | { |
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| 12 | public static readonly PlateCarreeProjection Instance = new PlateCarreeProjection(); |
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| 13 | |||
| 14 | static readonly double MinLatitude = -85.05112878; |
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| 15 | static readonly double MaxLatitude = 85.05112878; |
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| 16 | static readonly double MinLongitude = -180; |
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| 17 | static readonly double MaxLongitude = 180; |
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| 18 | |||
| 19 | public override RectLatLng Bounds |
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| 20 | { |
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| 21 | get |
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| 22 | { |
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| 23 | return RectLatLng.FromLTRB(MinLongitude, MaxLatitude, MaxLongitude, MinLatitude); |
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| 24 | } |
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| 25 | } |
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| 26 | |||
| 27 | GSize tileSize = new GSize(512, 512); |
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| 28 | public override GSize TileSize |
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| 29 | { |
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| 30 | get |
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| 31 | { |
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| 32 | return tileSize; |
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| 33 | } |
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| 34 | } |
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| 35 | |||
| 36 | public override double Axis |
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| 37 | { |
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| 38 | get |
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| 39 | { |
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| 40 | return 6378137; |
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| 41 | } |
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| 42 | } |
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| 43 | |||
| 44 | public override double Flattening |
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| 45 | { |
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| 46 | get |
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| 47 | { |
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| 48 | return (1.0 / 298.257223563); |
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| 49 | } |
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| 50 | } |
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| 51 | |||
| 52 | public override GPoint FromLatLngToPixel(double lat, double lng, int zoom) |
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| 53 | { |
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| 54 | GPoint ret = GPoint.Empty; |
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| 55 | |||
| 56 | lat = Clip(lat, MinLatitude, MaxLatitude); |
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| 57 | lng = Clip(lng, MinLongitude, MaxLongitude); |
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| 58 | |||
| 59 | GSize s = GetTileMatrixSizePixel(zoom); |
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| 60 | double mapSizeX = s.Width; |
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| 61 | double mapSizeY = s.Height; |
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| 62 | |||
| 63 | double scale = 360.0 / mapSizeX; |
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| 64 | |||
| 65 | ret.Y = (long)((90.0 - lat) / scale); |
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| 66 | ret.X = (long)((lng + 180.0) / scale); |
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| 67 | |||
| 68 | return ret; |
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| 69 | } |
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| 70 | |||
| 71 | public override PointLatLng FromPixelToLatLng(long x, long y, int zoom) |
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| 72 | { |
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| 73 | PointLatLng ret = PointLatLng.Empty; |
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| 74 | |||
| 75 | GSize s = GetTileMatrixSizePixel(zoom); |
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| 76 | double mapSizeX = s.Width; |
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| 77 | double mapSizeY = s.Height; |
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| 78 | |||
| 79 | double scale = 360.0 / mapSizeX; |
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| 80 | |||
| 81 | ret.Lat = 90 - (y * scale); |
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| 82 | ret.Lng = (x * scale) - 180; |
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| 83 | |||
| 84 | return ret; |
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| 85 | } |
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| 86 | |||
| 87 | public override GSize GetTileMatrixMaxXY(int zoom) |
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| 88 | { |
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| 89 | long y = (long)Math.Pow(2, zoom); |
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| 90 | return new GSize((2 * y) - 1, y - 1); |
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| 91 | } |
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| 92 | |||
| 93 | public override GSize GetTileMatrixMinXY(int zoom) |
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| 94 | { |
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| 95 | return new GSize(0, 0); |
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| 96 | } |
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| 97 | } |
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| 98 | } |