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/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
18// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
20// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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
24// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26// POSSIBILITY OF SUCH DAMAGE.
27
28#import <Foundation/Foundation.h>
29#import "RMMercatorToTileProjection.h"
30
31@class RMProjection;
32
33@interface RMFractalTileProjection : NSObject<RMMercatorToTileProjection> {
34	/// Maximum zoom for which our tile server stores images
35	NSUInteger maxZoom, minZoom;
36	
37	/// projected bounds of the planet, in meters
38	RMProjectedRect planetBounds;
39	
40	/// Normally 256. This class assumes tiles are square.
41	NSUInteger tileSideLength;
42	
43	/// The deal is, we have a scale which stores how many mercator gradiants per pixel
44	/// in the image.
45	/// If you run the maths, scale = bounds.width/(2^zoom * tileSideLength)
46	/// or if you want, z = log(bounds.width/tileSideLength) - log(s)
47	/// So here we'll cache the first term for efficiency.
48	/// I'm using width arbitrarily - I'm not sure what the effect of using the other term is when they're not the same.
49	double scaleFactor;
50}
51
52- (id) initFromProjection:(RMProjection*)projection tileSideLength:(NSUInteger)tileSideLength maxZoom: (NSUInteger) aMaxZoom minZoom: (NSUInteger) aMinZoom;
53
54- (void) setTileSideLength: (NSUInteger) aTileSideLength;
55- (void) setMinZoom: (NSUInteger) aMinZoom;
56- (void) setMaxZoom: (NSUInteger) aMaxZoom;
57
58@end