RMTileLoader.m
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//
// TimeImageSet.m
// Images
//
// Created by Joseph Gentle on 29/08/08.
// Copyright 2008 __MyCompanyName__. All rights reserved.
//
#import "RMTileLoader.h"
#import "RMTileImage.h"
#import "RMTileSource.h"
#import "RMPixel.h"
#import "RMMercatorToScreenProjection.h"
#import "RMFractalTileProjection.h"
#import "RMTileImageSet.h"
#import "RMTileCache.h"
NSString * const RMMapNewTilesBoundsNotification = @"NewTilesBounds";
NSString* const RMMapImageRemovedFromScreenNotification = @"RMMapImageRemovedFromScreen";
NSString* const RMMapImageAddedToScreenNotification = @"RMMapImageAddedToScreen";
NSString* const RMSuspendExpensiveOperations = @"RMSuspendExpensiveOperations";
NSString* const RMResumeExpensiveOperations = @"RMResumeExpensiveOperations";
@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 = CGRectMake(0, 0, 0, 0);
// loadedTiles.origin.tile = RMTileDummy();
}
-(BOOL) screenIsLoaded
{
// RMTileRect targetRect = [content tileBounds];
BOOL contained = CGRectContainsRect(loadedBounds, [content screenBounds]);
int targetZoom = (int)([[content mercatorToTileProjection] calculateNormalisedZoomFromScale:[content scale]]);
if (contained == NO)
{
// NSLog(@"reassembling because its not contained");
}
if (targetZoom != loadedZoom)
{
// NSLog(@"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;
if ([self screenIsLoaded])
return;
// NSLog(@"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];
// NSLog(@"-> count = %d", [images count]);
loadedBounds = newLoadedBounds;
loadedZoom = newTileRect.origin.tile.zoom;
loadedTiles = newTileRect;
[content tilesUpdatedRegion:newLoadedBounds];
}
- (void)moveBy: (CGSize) delta
{
// NSLog(@"loadedBounds %f %f %f %f -> ", loadedBounds.origin.x, loadedBounds.origin.y, loadedBounds.size.width, loadedBounds.size.height);
loadedBounds = RMTranslateCGRectBy(loadedBounds, delta);
// NSLog(@" -> %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