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//
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// RMMBTilesTileSource.m
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//
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// Created by Justin R. Miller on 6/18/10.
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// Copyright 2010, Code Sorcery Workshop, LLC and Development Seed, Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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//
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// * Neither the names of Code Sorcery Workshop, LLC or Development Seed,
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// Inc., nor the names of its contributors may be used to endorse or
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// promote products derived from this software without specific prior
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// written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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#import "RMMBTilesTileSource.h"
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#import "RMTileImage.h"
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#import "RMProjection.h"
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#import "RMFractalTileProjection.h"
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#import "FMDatabase.h"
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#import "FMDatabaseQueue.h"
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@implementation RMMBTilesTileSource
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- (id)initWithTileSetURL:(NSURL *)tileSetURL
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{
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if ( ! [super init])
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return nil;
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tileProjection = [[RMFractalTileProjection alloc] initFromProjection:[self projection]
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tileSideLength:kMBTilesDefaultTileSize
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maxZoom:kMBTilesDefaultMaxTileZoom
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minZoom:kMBTilesDefaultMinTileZoom];
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queue = [[FMDatabaseQueue databaseQueueWithPath:[tileSetURL relativePath]] retain];
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if ( ! queue)
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return nil;
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[[queue database] setShouldCacheStatements:YES];
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return self;
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}
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- (void)cancelAllDownloads
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{
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// no-op
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}
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- (void)dealloc
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{
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[tileProjection release];
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[queue release];
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[super dealloc];
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}
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- (int)tileSideLength
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{
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return tileProjection.tileSideLength;
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}
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- (void)setTileSideLength:(NSUInteger)aTileSideLength
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{
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[tileProjection setTileSideLength:aTileSideLength];
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}
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- (UIImage *)imageForTile:(RMTile)tile inCache:(RMTileCache *)tileCache
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{
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NSAssert4(((tile.zoom >= self.minZoom) && (tile.zoom <= self.maxZoom)),
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@"%@ tried to retrieve tile with zoomLevel %d, outside source's defined range %f to %f",
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self, tile.zoom, self.minZoom, self.maxZoom);
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NSInteger zoom = tile.zoom;
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NSInteger x = tile.x;
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NSInteger y = pow(2, zoom) - tile.y - 1;
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__block UIImage *image;
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[queue inDatabase:^(FMDatabase *db)
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{
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FMResultSet *results = [db executeQuery:@"select tile_data from tiles where zoom_level = ? and tile_column = ? and tile_row = ?",
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[NSNumber numberWithShort:zoom],
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[NSNumber numberWithUnsignedInt:x],
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[NSNumber numberWithUnsignedInt:y]];
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if ([db hadError])
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image = [RMTileImage errorTile];
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[results next];
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NSData *data = [results dataForColumn:@"tile_data"];
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if ( ! data)
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image = [RMTileImage errorTile];
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else
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image = [UIImage imageWithData:data];
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[results close];
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}];
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return image;
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}
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- (NSString *)tileURL:(RMTile)tile
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{
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return nil;
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}
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- (NSString *)tileFile:(RMTile)tile
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{
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return nil;
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}
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- (NSString *)tilePath
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{
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return nil;
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}
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- (RMFractalTileProjection *)mercatorToTileProjection
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{
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return [[tileProjection retain] autorelease];
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}
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- (RMProjection *)projection
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{
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return [RMProjection googleProjection];
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}
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- (float)minZoom
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{
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__block double minZoom;
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[queue inDatabase:^(FMDatabase *db)
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{
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FMResultSet *results = [db executeQuery:@"select min(zoom_level) from tiles"];
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if ([db hadError])
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minZoom = kMBTilesDefaultMinTileZoom;
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[results next];
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minZoom = [results doubleForColumnIndex:0];
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[results close];
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}];
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return minZoom;
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}
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- (float)maxZoom
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{
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__block double maxZoom;
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[queue inDatabase:^(FMDatabase *db)
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{
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FMResultSet *results = [db executeQuery:@"select max(zoom_level) from tiles"];
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if ([db hadError])
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maxZoom = kMBTilesDefaultMaxTileZoom;
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[results next];
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maxZoom = [results doubleForColumnIndex:0];
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[results close];
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}];
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return maxZoom;
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}
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- (void)setMinZoom:(NSUInteger)aMinZoom
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{
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[tileProjection setMinZoom:aMinZoom];
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}
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- (void)setMaxZoom:(NSUInteger)aMaxZoom
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{
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[tileProjection setMaxZoom:aMaxZoom];
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}
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- (RMSphericalTrapezium)latitudeLongitudeBoundingBox
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{
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__block RMSphericalTrapezium bounds = kMBTilesDefaultLatLonBoundingBox;
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[queue inDatabase:^(FMDatabase *db)
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{
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FMResultSet *results = [db executeQuery:@"select value from metadata where name = 'bounds'"];
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[results next];
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NSString *boundsString = [results stringForColumnIndex:0];
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[results close];
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if (boundsString)
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{
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NSArray *parts = [boundsString componentsSeparatedByString:@","];
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if ([parts count] == 4)
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{
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bounds.southWest.longitude = [[parts objectAtIndex:0] doubleValue];
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bounds.southWest.latitude = [[parts objectAtIndex:1] doubleValue];
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bounds.northEast.longitude = [[parts objectAtIndex:2] doubleValue];
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bounds.northEast.latitude = [[parts objectAtIndex:3] doubleValue];
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}
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}
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}];
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return bounds;
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}
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- (BOOL)coversFullWorld
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{
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RMSphericalTrapezium ownBounds = [self latitudeLongitudeBoundingBox];
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RMSphericalTrapezium defaultBounds = kMBTilesDefaultLatLonBoundingBox;
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if (ownBounds.southWest.longitude <= defaultBounds.southWest.longitude + 10 &&
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ownBounds.northEast.longitude >= defaultBounds.northEast.longitude - 10)
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return YES;
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return NO;
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}
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- (NSString *)legend
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{
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__block NSString *legend;
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[queue inDatabase:^(FMDatabase *db)
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{
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FMResultSet *results = [db executeQuery:@"select value from metadata where name = 'legend'"];
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if ([db hadError])
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legend = nil;
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[results next];
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legend = [results stringForColumn:@"value"];
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[results close];
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}];
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return legend;
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}
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- (void)didReceiveMemoryWarning
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{
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NSLog(@"*** didReceiveMemoryWarning in %@", [self class]);
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}
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- (NSString *)uniqueTilecacheKey
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{
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return [NSString stringWithFormat:@"MBTiles%@", [queue.path lastPathComponent]];
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}
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- (NSString *)shortName
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{
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__block NSString *shortName;
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[queue inDatabase:^(FMDatabase *db)
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{
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FMResultSet *results = [db executeQuery:@"select value from metadata where name = 'name'"];
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if ([db hadError])
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shortName = nil;
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[results next];
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shortName = [results stringForColumnIndex:0];
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[results close];
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}];
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return shortName;
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}
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- (NSString *)longDescription
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{
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__block NSString *description;
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[queue inDatabase:^(FMDatabase *db)
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{
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FMResultSet *results = [db executeQuery:@"select value from metadata where name = 'description'"];
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if ([db hadError])
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description = nil;
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[results next];
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description = [results stringForColumnIndex:0];
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[results close];
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}];
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return [NSString stringWithFormat:@"%@ - %@", [self shortName], description];
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}
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- (NSString *)shortAttribution
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{
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__block NSString *attribution;
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[queue inDatabase:^(FMDatabase *db)
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{
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FMResultSet *results = [db executeQuery:@"select value from metadata where name = 'attribution'"];
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if ([db hadError])
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attribution = @"Unknown MBTiles attribution";
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[results next];
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attribution = [results stringForColumnIndex:0];
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[results close];
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}];
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return attribution;
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}
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- (NSString *)longAttribution
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{
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return [NSString stringWithFormat:@"%@ - %@", [self shortName], [self shortAttribution]];
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}
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- (void)removeAllCachedImages
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{
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NSLog(@"*** removeAllCachedImages in %@", [self class]);
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}
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@end |
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\ No newline at end of file |
...
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...
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