RMTileLoader.m
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//
// 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"w
#import "RMTileLoader.h"
#import "RMTileImage.h"
#import "RMTileSource.h"
#import "RMPixel.h"
#import "RMMercatorToScreenProjection.h"
#import "RMFractalTileProjection.h"
#import "RMTileImageSet.h"
#import "RMTileCache.h"
/// \bug magic string literals should be moved to central location
NSString* const RMMapImageRemovedFromScreenNotification = @"RMMapImageRemovedFromScreen";
NSString* const RMMapImageAddedToScreenNotification = @"RMMapImageAddedToScreen";
NSString* const RMSuspendExpensiveOperations = @"RMSuspendExpensiveOperations";
NSString* const RMResumeExpensiveOperations = @"RMResumeExpensiveOperations";
NSString* const RMTileRetrieved = @"RMTileRetrieved";
NSString* const RMTileRequested = @"RMTileRequested";
@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
{
[super dealloc];
}
-(void) clearLoadedBounds
{
loadedBounds = kEmptyRect;
// loadedTiles.origin.tile = RMTileDummy();
}
-(BOOL) screenIsLoaded
{
// RMTileRect targetRect = [content tileBounds];
BOOL contained = CGRectContainsRect(loadedBounds, [content screenBounds]);
int targetZoom = (int)([[content mercatorToTileProjection] calculateNormalisedZoomFromScale:[content metersPerPixel]]);
NSAssert3(((targetZoom <= content.maxZoom) && (targetZoom >= content.minZoom)),
@"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(@"assemble count = %d", [[content imagesOnScreen] count]);
RMTileRect newTileRect = [content tileBounds];
RMTileImageSet *images = [content imagesOnScreen];
CGRect newLoadedBounds = [images addTiles:newTileRect ToDisplayIn:
[content screenBounds]];
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) 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]];
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)reload
{
[self clearLoadedBounds];
[self updateLoadedImages];
}
//-(BOOL) containsRect: (CGRect)bounds
//{
// return CGRectContainsRect(loadedBounds, bounds);
//}
@end