/MapView/Map/RMMercatorToTileProjection.h

//
//  RMMercatorToTileProjection.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
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//
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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#import <Foundation/Foundation.h>
#import "RMFoundation.h"
#import "RMTile.h"
#import "RMMercatorToTileProjection.h"

@class RMMercatorToScreenProjection;

/// A tile projection is a projection which turns mercators into tile coordinates.
/// At time of writing, read RMFractalTileProjection to see the implementation of this.
@protocol RMMercatorToTileProjection<NSObject>

-(RMTilePoint) project: (RMProjectedPoint)aPoint atZoom:(float)zoom;
-(RMTileRect) projectRect: (RMProjectedRect)aRect atZoom:(float)zoom;

-(RMTilePoint) project: (RMProjectedPoint)aPoint atScale:(float)scale;
-(RMTileRect) projectRect: (RMProjectedRect)aRect atScale:(float)scale;

/// This is a helper for projectRect above. Much simpler for the caller.
-(RMTileRect) project: (RMMercatorToScreenProjection*)screen;

-(RMTile) normaliseTile: (RMTile) tile;

-(float) normaliseZoom: (float) zoom;

-(float) calculateZoomFromScale: (float) scale;
-(float) calculateNormalisedZoomFromScale: (float) scale;
-(float) calculateScaleFromZoom: (float) zoom;

/// bounds of the earth, in projected units (meters).
@property(readonly, nonatomic) RMProjectedRect planetBounds;

/// Maximum zoom for which we have tile images 
@property(readonly, nonatomic) NSUInteger maxZoom;
/// Minimum zoom for which we have tile images 
@property(readonly, nonatomic) NSUInteger minZoom;

/// Tile side length in pixels
@property(readonly, nonatomic) NSUInteger tileSideLength;

@end