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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
#import <CoreGraphics/CoreGraphics.h>
#import "MGLFoundation.h"
#import "MGLTileSource.h"
NS_ASSUME_NONNULL_BEGIN
/**
An `NSNumber` object containing a floating-point number that specifies the
width and height (measured in points) at which the map displays each raster
image tile when the map’s zoom level is an integer. The raster source scales
its images up or down when the map’s zoom level falls between two integers.
The default value for this option is 512. Version 4 of the
<a href="https://www.mapbox.com/api-documentation/#maps">Mapbox Maps API</a>
requires a value of 256, as do many third-party tile servers, so consult your
provider’s documentation for the correct value.
This option is only applicable to `MGLRasterSource` objects; it is ignored when
initializing `MGLVectorSource` objects.
*/
extern MGL_EXPORT const MGLTileSourceOption MGLTileSourceOptionTileSize;
/**
`MGLRasterSource` is a map content source that supplies raster image tiles to
be shown on the map. The location of and metadata about the tiles are defined
either by an option dictionary or by an external file that conforms to the
<a href="https://github.com/mapbox/tilejson-spec/">TileJSON specification</a>.
A raster source is added to an `MGLStyle` object along with one or more
`MGLRasterStyleLayer` objects. Use a raster style layer to control the
appearance of content supplied by the raster source.
Each
<a href="https://www.mapbox.com/mapbox-gl-style-spec/#sources-raster"><code>raster</code></a>
source defined by the style JSON file is represented at runtime by an
`MGLRasterSource` object that you can use to initialize new style layers. You
can also add and remove sources dynamically using methods such as
`-[MGLStyle addSource:]` and `-[MGLStyle sourceWithIdentifier:]`.
### Example
```swift
let source = MGLRasterSource(identifier: "clouds", tileURLTemplates: ["https://example.com/raster-tiles/{z}/{x}/{y}.png"], options: [
.minimumZoomLevel: 9,
.maximumZoomLevel: 16,
.tileSize: 512,
.attributionInfos: [
MGLAttributionInfo(title: NSAttributedString(string: "© Mapbox"), url: URL(string: "http://mapbox.com"))
]
])
mapView.style?.addSource(source)
```
*/
MGL_EXPORT
@interface MGLRasterSource : MGLTileSource
#pragma mark Initializing a Source
/**
Returns a raster source initialized with an identifier and configuration URL.
After initializing and configuring the source, add it to a map view’s style
using the `-[MGLStyle addSource:]` method.
The URL may be a full HTTP or HTTPS URL or, for tile sets hosted by Mapbox, a
Mapbox URL indicating a map identifier (`mapbox://<mapid>`). The URL should
point to a JSON file that conforms to the
<a href="https://github.com/mapbox/tilejson-spec/">TileJSON specification</a>.
If a Mapbox URL is specified, this source uses a tile size of 256. For all
other tile sets, the default value is 512. (See the
`MGLTileSourceOptionTileSize` documentation for more information about tile
sizes.) If you need to use a tile size other than the default, use the
`-initWithIdentifier:configurationURL:tileSize:` method.
@param identifier A string that uniquely identifies the source in the style to
which it is added.
@param configurationURL A URL to a TileJSON configuration file describing the
source’s contents and other metadata.
@return An initialized raster source.
*/
- (instancetype)initWithIdentifier:(NSString *)identifier configurationURL:(NSURL *)configurationURL;
/**
Returns a raster source initialized with an identifier, configuration URL, and
tile size.
After initializing and configuring the source, add it to a map view’s style
using the `-[MGLStyle addSource:]` method.
The URL may be a full HTTP or HTTPS URL or, for tile sets hosted by Mapbox, a
Mapbox URL indicating a map identifier (`mapbox://<mapid>`). The URL should
point to a JSON file that conforms to the
<a href="https://github.com/mapbox/tilejson-spec/">TileJSON specification</a>.
@param identifier A string that uniquely identifies the source in the style to
which it is added.
@param configurationURL A URL to a TileJSON configuration file describing the
source’s contents and other metadata.
@param tileSize The width and height (measured in points) of each tiled image
in the raster source. See the `MGLTileSourceOptionTileSize` documentation
for details.
@return An initialized raster source.
*/
- (instancetype)initWithIdentifier:(NSString *)identifier configurationURL:(NSURL *)configurationURL tileSize:(CGFloat)tileSize NS_DESIGNATED_INITIALIZER;
/**
Returns a raster source initialized an identifier, tile URL templates, and
options.
After initializing and configuring the source, add it to a map view’s style
using the `-[MGLStyle addSource:]` method.
#### Tile URL templates
Tile URL templates are strings that specify the URLs of the tile images to
load. Each template resembles an absolute URL, but with any number of
placeholder strings that the source evaluates based on the tile it needs to
load. For example:
<ul>
<li><code>http://www.example.com/tiles/{z}/{x}/{y}.pbf</code> could be
evaluated as <code>http://www.example.com/tiles/14/6/9.pbf</code>.</li>
<li><code>http://www.example.com/tiles/{z}/{x}/{y}{ratio}.png</code> could be
evaluated as <code>http://www.example.com/tiles/14/6/9@2x.png</code>.</li>
</ul>
Tile sources support the following placeholder strings in tile URL templates,
all of which are optional:
<table>
<thead>
<tr><th>Placeholder string</th><th>Description</th></tr>
</thead>
<tbody>
<tr>
<td><code>{x}</code></td>
<td>The index of the tile along the map’s x axis according to Spherical
Mercator projection. If the value is 0, the tile’s left edge corresponds
to the 180th meridian west. If the value is 2<sup><var>z</var></sup>−1,
the tile’s right edge corresponds to the 180th meridian east.</td>
</tr>
<tr>
<td><code>{y}</code></td>
<td>The index of the tile along the map’s y axis according to Spherical
Mercator projection. If the value is 0, the tile’s tile edge corresponds
to arctan(sinh(π)), or approximately 85.0511 degrees north. If the value
is 2<sup><var>z</var></sup>−1, the tile’s bottom edge corresponds to
−arctan(sinh(π)), or approximately 85.0511 degrees south. The y axis is
inverted if the <code>options</code> parameter contains
<code>MGLTileSourceOptionTileCoordinateSystem</code> with a value of
<code>MGLTileCoordinateSystemTMS</code>.</td>
</tr>
<tr>
<td><code>{z}</code></td>
<td>The tile’s zoom level. At zoom level 0, each tile covers the entire
world map; at zoom level 1, it covers ¼ of the world; at zoom level 2,
<sup>1</sup>⁄<sub>16</sub> of the world, and so on. For tiles loaded by
a <code>MGLRasterSource</code> object, whether the tile zoom level
matches the map’s current zoom level depends on the value of the
source’s tile size as specified in the
<code>MGLTileSourceOptionTileSize</code> key of the
<code>options</code> parameter.</td>
</tr>
<tr>
<td><code>{bbox-epsg-3857}</code></td>
<td>The tile’s bounding box, expressed as a comma-separated list of the
tile’s western, southern, eastern, and northern extents according to
Spherical Mercator (EPSG:3857) projection. The bounding box is typically
used with map services conforming to the
<a href="http://www.opengeospatial.org/standards/wms">Web Map Service</a>
protocol.</td>
</tr>
<tr>
<td><code>{quadkey}</code></td>
<td>A quadkey indicating both the tile’s location and its zoom level. The
quadkey is typically used with
<a href="https://msdn.microsoft.com/en-us/library/bb259689.aspx">Bing Maps</a>.
</td>
</tr>
<tr>
<td><code>{ratio}</code></td>
<td>A suffix indicating the resolution of the tile image. The suffix is the
empty string for standard resolution displays and <code>@2x</code> for
Retina displays, including displays for which
<code>NSScreen.backingScaleFactor</code> or <code>UIScreen.scale</code>
is 3.</td>
</tr>
<tr>
<td><code>{prefix}</code></td>
<td>Two hexadecimal digits chosen such that each visible tile has a
different prefix. The prefix is typically used for domain sharding.</td>
</tr>
</tbody>
</table>
For more information about the `{x}`, `{y}`, and `{z}` placeholder strings,
consult the
<a href="https://wiki.openstreetmap.org/wiki/Slippy_map_tilenames">OpenStreetMap Wiki</a>.
@param identifier A string that uniquely identifies the source in the style to
which it is added.
@param tileURLTemplates An array of tile URL template strings. Only the first
string is used; any additional strings are ignored.
@param options A dictionary containing configuration options. See
`MGLTileSourceOption` for available keys and values. Pass in `nil` to use
the default values.
@return An initialized tile source.
*/
- (instancetype)initWithIdentifier:(NSString *)identifier tileURLTemplates:(NS_ARRAY_OF(NSString *) *)tileURLTemplates options:(nullable NS_DICTIONARY_OF(MGLTileSourceOption, id) *)options NS_DESIGNATED_INITIALIZER;
@end
NS_ASSUME_NONNULL_END
|
