RMWMSSource.m
3.33 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
//
// RMWMSSource.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 "RMWMSSource.h"
@implementation RMWMSSource
@synthesize minZoom;
@synthesize maxZoom;
@synthesize name;
@synthesize uniqueTilecacheKey;
@synthesize wms;
-(id) init
{
if (![super init])
return nil;
// The code below is based on the followin URL, but fixed for this use
// http://groups.google.com/group/route-me-map/browse_thread/thread/b6aa3757d46055aa/c93e7b0c861973e5?lnk=gst&q=900913#c93e7b0c861973e5
initialResolution = 2 * M_PI * 6378137 / kDefaultTileSize;
originShift = 2 * M_PI * 6378137 / 2.0;
[self setMinZoom:1.0];
[self setMaxZoom:18.0];
// some default values
[self setName:@"wms"];
[self setUniqueTilecacheKey:@"wms"];
return self;
}
-(NSString*) bboxForTile: (RMTile) tile
{
float resolution = [self resolutionAtZoom: tile.zoom];
CGPoint min = [self pixelsToMetersAtZoom: (tile.x * kDefaultTileSize) PixelY:((tile.y+1) * kDefaultTileSize) atResolution:resolution];
CGPoint max = [self pixelsToMetersAtZoom: ((tile.x+1) * kDefaultTileSize) PixelY:((tile.y) * kDefaultTileSize) atResolution:resolution];
return [NSString stringWithFormat:@"%f,%f,%f,%f",
min.x, min.y, max.x, max.y];
}
-(NSString*) tileURL: (RMTile) tile
{
NSString *bbox = [self bboxForTile:tile];
return [wms createGetMapForBbox:bbox size:CGSizeMake(kDefaultTileSize, kDefaultTileSize)];
}
//Resolution (meters/pixel) for given zoom level (measured at Equator)
-(float) resolutionAtZoom : (int) zoom
{
return initialResolution /pow (2,zoom);
}
// Converts pixel coordinates in given resolution to EPSG: 900913
-(CGPoint) pixelsToMetersAtZoom: (int) px PixelY:(int)py atResolution:(float) resolution
{
CGPoint meters;
meters.x = (px * resolution) - originShift;
meters.y = originShift - (py * resolution);
return meters;
}
- (void) dealloc
{
[self setName:nil];
[self setUniqueTilecacheKey:nil];
[self setWms:nil];
[super dealloc];
}
@end