//
//  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:
//
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//   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
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//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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#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