/MapView/Map/RMTileLoader.m
http://github.com/route-me/route-me · Objective C · 225 lines · 113 code · 41 blank · 71 comment · 21 complexity · d187ea07c5858bf7fc5dd43fc0ad46e1 MD5 · raw file
- //
- // RMTimeImageSet.m
- //
- // 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
- // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- // POSSIBILITY OF SUCH DAMAGE.
- #import "RMGlobalConstants.h"
- #import "RMTileLoader.h"
- #import "RMTileImage.h"
- #import "RMTileSource.h"
- #import "RMPixel.h"
- #import "RMMercatorToScreenProjection.h"
- #import "RMFractalTileProjection.h"
- #import "RMTileImageSet.h"
- #import "RMTileCache.h"
- @implementation RMTileLoader
- @synthesize loadedBounds, loadedZoom;
- -(id) init
- {
- if (![self initWithContent: nil])
- return nil;
-
- return self;
- }
- -(id) initWithContent: (RMMapContents *)_contents
- {
- if (![super init])
- return nil;
-
- content = _contents;
-
- [self clearLoadedBounds];
- loadedTiles.origin.tile = RMTileDummy();
-
- suppressLoading = NO;
-
- return self;
- }
- -(void) dealloc
- {
- [[NSNotificationCenter defaultCenter] removeObserver:self];
- [super dealloc];
- }
- -(void) clearLoadedBounds
- {
- loadedBounds = CGRectZero;
- }
- -(BOOL) screenIsLoaded
- {
- // RMTileRect targetRect = [content tileBounds];
- BOOL contained = CGRectContainsRect(loadedBounds, [content screenBounds]);
-
- int targetZoom = (int)([[content mercatorToTileProjection] calculateNormalisedZoomFromScale:[content scaledMetersPerPixel]]);
- if((targetZoom > content.maxZoom) || (targetZoom < content.minZoom))
- RMLog(@"target zoom %d is outside of RMMapContents limits %f to %f",
- targetZoom, content.minZoom, content.maxZoom);
- if (contained == NO)
- {
- // RMLog(@"reassembling because its not contained");
- }
-
- if (targetZoom != loadedZoom)
- {
- // RMLog(@"reassembling because target zoom = %f, loaded zoom = %d", targetZoom, loadedZoom);
- }
-
- return contained && targetZoom == loadedZoom;
- }
- -(void) updateLoadedImages
- {
- if (suppressLoading)
- return;
-
- if ([content mercatorToTileProjection] == nil || [content
- mercatorToScreenProjection] == nil)
- return;
-
- // delay display of new images until expensive operations are
- //allowed
- [[NSNotificationCenter defaultCenter] removeObserver:self
- name:RMResumeExpensiveOperations object:nil];
- if ([RMMapContents performExpensiveOperations] == NO)
- {
- [[NSNotificationCenter defaultCenter] addObserver:self
- selector:@selector(updateLoadedImages)
- name:RMResumeExpensiveOperations object:nil];
- return;
- }
-
- if ([self screenIsLoaded])
- return;
-
- //RMLog(@"updateLoadedImages initial count = %d", [[content imagesOnScreen] count]);
-
- RMTileRect newTileRect = [content tileBounds];
-
- RMTileImageSet *images = [content imagesOnScreen];
- images.zoom = newTileRect.origin.tile.zoom;
- CGRect newLoadedBounds = [images addTiles:newTileRect ToDisplayIn:
- [content screenBounds]];
- //RMLog(@"updateLoadedImages added count = %d", [images count]);
-
-
- if (!RMTileIsDummy(loadedTiles.origin.tile))
- {
- [images removeTilesOutsideOf:newTileRect];
- }
-
- //RMLog(@"updateLoadedImages final count = %d", [images count]);
-
- loadedBounds = newLoadedBounds;
- loadedZoom = newTileRect.origin.tile.zoom;
- loadedTiles = newTileRect;
-
- [content tilesUpdatedRegion:newLoadedBounds];
-
- }
- /*
- -(void) updateLoadedImages
- {
- if (suppressLoading)
- return;
-
- if ([content mercatorToTileProjection] == nil || [content mercatorToScreenProjection] == nil)
- return;
-
- if ([self screenIsLoaded])
- return;
-
- RMLog(@"assemble count = %d", [[content imagesOnScreen] count]);
-
- RMTileRect newTileRect = [content tileBounds];
-
- RMTileImageSet *images = [content imagesOnScreen];
- CGRect newLoadedBounds = [images addTiles:newTileRect ToDisplayIn:[content screenBounds]];
- RMLog(@"-> mid count = %d", [images count]);
-
- if (!RMTileIsDummy(loadedTiles.origin.tile))
- [images removeTiles:loadedTiles];
-
- RMLog(@"-> count = %d", [images count]);
-
- loadedBounds = newLoadedBounds;
- loadedZoom = newTileRect.origin.tile.zoom;
- loadedTiles = newTileRect;
-
- [content tilesUpdatedRegion:newLoadedBounds];
- }*/
- - (void)moveBy: (CGSize) delta
- {
- // RMLog(@"loadedBounds %f %f %f %f -> ", loadedBounds.origin.x, loadedBounds.origin.y, loadedBounds.size.width, loadedBounds.size.height);
- loadedBounds = RMTranslateCGRectBy(loadedBounds, delta);
- // RMLog(@" -> %f %f %f %f", loadedBounds.origin.x, loadedBounds.origin.y, loadedBounds.size.width, loadedBounds.size.height);
- [self updateLoadedImages];
- }
- - (void)zoomByFactor: (float) zoomFactor near:(CGPoint) center
- {
- loadedBounds = RMScaleCGRectAboutPoint(loadedBounds, zoomFactor, center);
- [self updateLoadedImages];
- }
- - (BOOL) suppressLoading
- {
- return suppressLoading;
- }
- - (void) setSuppressLoading: (BOOL) suppress
- {
- suppressLoading = suppress;
-
- if (suppress == NO)
- [self updateLoadedImages];
- }
- - (void)reset
- {
- loadedTiles.origin.tile = RMTileDummy();
- }
- - (void)reload
- {
- [self clearLoadedBounds];
- [self updateLoadedImages];
- }
- //-(BOOL) containsRect: (CGRect)bounds
- //{
- // return CGRectContainsRect(loadedBounds, bounds);
- //}
- @end