/MapView/Map/RMFractalTileProjection.h

http://github.com/route-me/route-me · C Header · 58 lines · 14 code · 9 blank · 35 comment · 0 complexity · cea9c7aa8639b12cfc09f3cfd80d58de MD5 · raw file

  1. //
  2. // RMFractalTileProjection.h
  3. //
  4. // Copyright (c) 2008-2009, Route-Me Contributors
  5. // All rights reserved.
  6. //
  7. // Redistribution and use in source and binary forms, with or without
  8. // modification, are permitted provided that the following conditions are met:
  9. //
  10. // * Redistributions of source code must retain the above copyright notice, this
  11. // list of conditions and the following disclaimer.
  12. // * Redistributions in binary form must reproduce the above copyright notice,
  13. // this list of conditions and the following disclaimer in the documentation
  14. // and/or other materials provided with the distribution.
  15. //
  16. // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17. // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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  20. // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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  22. // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23. // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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  27. #import <Foundation/Foundation.h>
  28. #import "RMMercatorToTileProjection.h"
  29. @class RMProjection;
  30. @interface RMFractalTileProjection : NSObject<RMMercatorToTileProjection> {
  31. /// Maximum zoom for which our tile server stores images
  32. NSUInteger maxZoom, minZoom;
  33. /// projected bounds of the planet, in meters
  34. RMProjectedRect planetBounds;
  35. /// Normally 256. This class assumes tiles are square.
  36. NSUInteger tileSideLength;
  37. /// The deal is, we have a scale which stores how many mercator gradiants per pixel
  38. /// in the image.
  39. /// If you run the maths, scale = bounds.width/(2^zoom * tileSideLength)
  40. /// or if you want, z = log(bounds.width/tileSideLength) - log(s)
  41. /// So here we'll cache the first term for efficiency.
  42. /// I'm using width arbitrarily - I'm not sure what the effect of using the other term is when they're not the same.
  43. double scaleFactor;
  44. }
  45. - (id) initFromProjection:(RMProjection*)projection tileSideLength:(NSUInteger)tileSideLength maxZoom: (NSUInteger) aMaxZoom minZoom: (NSUInteger) aMinZoom;
  46. - (void) setTileSideLength: (NSUInteger) aTileSideLength;
  47. - (void) setMinZoom: (NSUInteger) aMinZoom;
  48. - (void) setMaxZoom: (NSUInteger) aMaxZoom;
  49. @end