//
//  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
//   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
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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;

- (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