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#import "MGLAbstractShapeSource.h"
#import "MGLFoundation.h"
#import "MGLTypes.h"
#import "MGLShape.h"
NS_ASSUME_NONNULL_BEGIN
@protocol MGLFeature;
/**
`MGLShapeSource` is a map content source that supplies vector shapes to be
shown on the map. The shapes may be instances of `MGLShape` or `MGLFeature`,
or they may be defined by local or external
<a href="http://geojson.org/">GeoJSON</a> code. A shape source is added to an
`MGLStyle` object along with an `MGLVectorStyleLayer` object. The vector style
layer defines the appearance of any content supplied by the shape source.
Each
<a href="https://www.mapbox.com/mapbox-gl-style-spec/#sources-geojson"><code>geojson</code></a>
source defined by the style JSON file is represented at runtime by an
`MGLShapeSource` object that you can use to refine the map’s content and
initialize new style layers. You can also add and remove sources dynamically
using methods such as `-[MGLStyle addSource:]` and
`-[MGLStyle sourceWithIdentifier:]`.
Any vector style layer initialized with a shape source should have a `nil`
value in its `sourceLayerIdentifier` property.
### Example
```swift
var coordinates: [CLLocationCoordinate2D] = [
CLLocationCoordinate2D(latitude: 37.77, longitude: -122.42),
CLLocationCoordinate2D(latitude: 38.91, longitude: -77.04),
]
let polyline = MGLPolylineFeature(coordinates: &coordinates, count: UInt(coordinates.count))
let source = MGLShapeSource(identifier: "lines", features: [polyline], options: nil)
mapView.style?.addSource(source)
```
*/
MGL_EXPORT
@interface MGLShapeSource : MGLAbstractShapeSource
#pragma mark Initializing a Source
/**
Returns a shape source with an identifier, URL, and dictionary of options for
the source.
@param identifier A string that uniquely identifies the source.
@param URL An HTTP(S) URL, absolute file URL, or local file URL relative to the
current application’s resource bundle.
@param options An `NSDictionary` of options for this source.
@return An initialized shape source.
*/
- (instancetype)initWithIdentifier:(NSString *)identifier URL:(NSURL *)url options:(nullable NS_DICTIONARY_OF(MGLShapeSourceOption, id) *)options NS_DESIGNATED_INITIALIZER;
/**
Returns a shape source with an identifier, a shape, and dictionary of options
for the source.
To specify attributes about the shape, use an instance of an `MGLShape`
subclass that conforms to the `MGLFeature` protocol, such as `MGLPointFeature`.
To include multiple shapes in the source, use an `MGLShapeCollection` or
`MGLShapeCollectionFeature` object, or use the
`-initWithIdentifier:features:options:` or
`-initWithIdentifier:shapes:options:` methods.
To create a shape from GeoJSON source code, use the
`+[MGLShape shapeWithData:encoding:error:]` method.
@param identifier A string that uniquely identifies the source.
@param shape A concrete subclass of `MGLShape`
@param options An `NSDictionary` of options for this source.
@return An initialized shape source.
*/
- (instancetype)initWithIdentifier:(NSString *)identifier shape:(nullable MGLShape *)shape options:(nullable NS_DICTIONARY_OF(MGLShapeSourceOption, id) *)options NS_DESIGNATED_INITIALIZER;
/**
Returns a shape source with an identifier, an array of features, and a dictionary
of options for the source.
Unlike `-initWithIdentifier:shapes:options:`, this method accepts `MGLFeature`
instances, such as `MGLPointFeature` objects, whose attributes you can use when
applying a predicate to `MGLVectorStyleLayer` or configuring a style layer’s
appearance.
To create a shape from GeoJSON source code, use the
`+[MGLShape shapeWithData:encoding:error:]` method.
@param identifier A string that uniquely identifies the source.
@param features An array of objects that conform to the MGLFeature protocol.
@param options An `NSDictionary` of options for this source.
@return An initialized shape source.
*/
- (instancetype)initWithIdentifier:(NSString *)identifier features:(NS_ARRAY_OF(MGLShape<MGLFeature> *) *)features options:(nullable NS_DICTIONARY_OF(MGLShapeSourceOption, id) *)options;
/**
Returns a shape source with an identifier, an array of shapes, and a dictionary of
options for the source.
Any `MGLFeature` instance passed into this initializer is treated as an ordinary
shape, causing any attributes to be inaccessible to an `MGLVectorStyleLayer` when
evaluating a predicate or configuring certain layout or paint attributes. To
preserve the attributes associated with each feature, use the
`-initWithIdentifier:features:options:` method instead.
To create a shape from GeoJSON source code, use the
`+[MGLShape shapeWithData:encoding:error:]` method.
@param identifier A string that uniquely identifies the source.
@param shapes An array of shapes; each shape is a member of a concrete subclass of MGLShape.
@param options An `NSDictionary` of options for this source.
@return An initialized shape source.
*/
- (instancetype)initWithIdentifier:(NSString *)identifier shapes:(NS_ARRAY_OF(MGLShape *) *)shapes options:(nullable NS_DICTIONARY_OF(MGLShapeSourceOption, id) *)options;
#pragma mark Accessing a Source’s Content
/**
The contents of the source. A shape can represent a GeoJSON geometry, a
feature, or a collection of features.
If the receiver was initialized using `-initWithIdentifier:URL:options:`, this
property is set to `nil`. This property is unavailable until the receiver is
passed into `-[MGLStyle addSource:]`.
You can get/set the shapes within a collection via this property. Actions must
be performed on the application's main thread.
*/
@property (nonatomic, copy, nullable) MGLShape *shape;
/**
The URL to the GeoJSON document that specifies the contents of the source.
If the receiver was initialized using `-initWithIdentifier:shape:options:`,
this property is set to `nil`.
*/
@property (nonatomic, copy, nullable) NSURL *URL;
@end
NS_ASSUME_NONNULL_END
|
