/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
- //
- // RMFractalTileProjection.h
- //
- // Copyright (c) 2008-2009, Route-Me Contributors
- // All rights reserved.
- //
- // Redistribution and use in source and binary forms, with or without
- // modification, are permitted provided that the following conditions are met:
- //
- // * Redistributions of source code must retain the above copyright notice, this
- // list of conditions and the following disclaimer.
- // * Redistributions in binary form must reproduce the above copyright notice,
- // this list of conditions and the following disclaimer in the documentation
- // and/or other materials provided with the distribution.
- //
- // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
- // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- // POSSIBILITY OF SUCH DAMAGE.
- #import <Foundation/Foundation.h>
- #import "RMMercatorToTileProjection.h"
- @class RMProjection;
- @interface RMFractalTileProjection : NSObject<RMMercatorToTileProjection> {
- /// Maximum zoom for which our tile server stores images
- NSUInteger maxZoom, minZoom;
-
- /// projected bounds of the planet, in meters
- RMProjectedRect planetBounds;
-
- /// Normally 256. This class assumes tiles are square.
- NSUInteger tileSideLength;
-
- /// The deal is, we have a scale which stores how many mercator gradiants per pixel
- /// in the image.
- /// If you run the maths, scale = bounds.width/(2^zoom * tileSideLength)
- /// or if you want, z = log(bounds.width/tileSideLength) - log(s)
- /// So here we'll cache the first term for efficiency.
- /// I'm using width arbitrarily - I'm not sure what the effect of using the other term is when they're not the same.
- double scaleFactor;
- }
- - (id) initFromProjection:(RMProjection*)projection tileSideLength:(NSUInteger)tileSideLength maxZoom: (NSUInteger) aMaxZoom minZoom: (NSUInteger) aMinZoom;
- - (void) setTileSideLength: (NSUInteger) aTileSideLength;
- - (void) setMinZoom: (NSUInteger) aMinZoom;
- - (void) setMaxZoom: (NSUInteger) aMaxZoom;
- @end