/MapView/Map/RMMapLayer.m

 1//
 2//  RMMapLayer.m
 3//
 4// Copyright (c) 2008-2009, Route-Me Contributors
 5// All rights reserved.
 6//
 7// Redistribution and use in source and binary forms, with or without
 8// modification, are permitted provided that the following conditions are met:
 9//
10// * Redistributions of source code must retain the above copyright notice, this
11//   list of conditions and the following disclaimer.
12// * Redistributions in binary form must reproduce the above copyright notice,
13//   this list of conditions and the following disclaimer in the documentation
14//   and/or other materials provided with the distribution.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
20// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26// POSSIBILITY OF SUCH DAMAGE.
27
28#import "RMMapLayer.h"
29#import "RMPixel.h"
30
31@implementation RMMapLayer
32
33- (id) init
34{
35	if (![super init])
36		return nil;
37	
38	return self;
39}
40
41- (id)initWithLayer:(id)layer
42{
43	if (![super initWithLayer:layer])
44		return nil;
45	
46	return self;
47}
48
49/// \bug why return nil for the "position" and "bounds" actionForKey? Does this do anything besides block Core Animation?
50- (id<CAAction>)actionForKey:(NSString *)key
51{
52	if ([key isEqualToString:@"position"]
53		|| [key isEqualToString:@"bounds"])
54		return nil;
55	
56	else return [super actionForKey:key];
57}
58
59- (void)moveBy: (CGSize) delta
60{
61	self.position = RMTranslateCGPointBy(self.position, delta);
62}
63
64- (void)zoomByFactor: (float) zoomFactor near:(CGPoint) pivot
65{
66    // a empty layer has size=(0,0) which cause divide by 0 if scaled
67    if(self.bounds.size.width == 0.0 || self.bounds.size.height == 0.0)
68        return;
69	self.position = RMScaleCGPointAboutPoint(self.position, zoomFactor, pivot);
70	self.bounds = RMScaleCGRectAboutPoint(self.bounds, zoomFactor, self.anchorPoint);
71}
72
73@end