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//
// MATileOverlay.h
// MapKit_static
//
// Created by Li Fei on 11/22/13.
// Copyright © 2016 Amap. All rights reserved.
//
#import "MAConfig.h"
#if MA_INCLUDE_OVERLAY_TILE
#import "MAOverlay.h"
#import "MABaseOverlay.h"
///该类是覆盖在球面墨卡托投影上的图片tiles的数据源
@interface MATileOverlay : MABaseOverlay
///瓦片大小，默认是256x256, 最小支持64*64
@property (nonatomic, assign) CGSize tileSize;
///tileOverlay的可见最小Zoom值
@property NSInteger minimumZ;
///tileOverlay的可见最大Zoom值
@property NSInteger maximumZ;
///同initWithURLTemplate:中的URLTemplate
@property (readonly) NSString *URLTemplate;
///暂未开放
@property (nonatomic) BOOL canReplaceMapContent;
///是否停止不在显示区域内的瓦片下载，默认NO. since 5.3.0
@property (nonatomic, assign) BOOL disableOffScreenTileLoading;
/**
* @brief 根据指定的URLTemplate生成tileOverlay
* @param URLTemplate URLTemplate是一个包含"{x}","{y}","{z}","{scale}"的字符串,"{x}","{y}","{z}","{scale}"会被tile path的值所替换，并生成用来加载tile图片数据的URL 。例如 http://server/path?x={x}&y={y}&z={z}&scale={scale}
* @return 以指定的URLTemplate字符串生成tileOverlay
*/
- (id)initWithURLTemplate:(NSString *)URLTemplate;
@end
///MATileOverlayPath
struct MATileOverlayPath{
NSInteger x; ///< x坐标
NSInteger y; ///< y坐标
NSInteger z; ///< 缩放级别
CGFloat contentScaleFactor; ///< 屏幕的scale factor
NSInteger index; ///< 对应的下载url
};
typedef struct MATileOverlayPath MATileOverlayPath;
///子类可覆盖CustomLoading中的方法来自定义加载MATileOverlay的行为。
@interface MATileOverlay (CustomLoading)
/**
* @brief 以tile path生成URL。用于加载tile,此方法默认填充URLTemplate
* @param path tile path
* @return 以tile path生成tileOverlay
*/
- (NSURL *)URLForTilePath:(MATileOverlayPath)path;
/**
* @brief 加载被请求的tile,并以tile数据或加载tile失败error访问回调block;默认实现为首先用URLForTilePath去获取URL,然后用异步NSURLConnection加载tile
* @param path tile path
* @param result 用来传入tile数据或加载tile失败的error访问的回调block
*/
- (void)loadTileAtPath:(MATileOverlayPath)path result:(void (^)(NSData *tileData, NSError *error))result;
/**
* @brief 取消请求瓦片，当地图显示区域发生变化时，会取消显示区域外的瓦片的下载, 当disableOffScreenTileLoading=YES时会被调用。since 5.3.0
* @param path tile path
*/
- (void)cancelLoadOfTileAtPath:(MATileOverlayPath)path;
@end
#endif
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