0a8858f2da
MGLShape subclasses can now return NSDictionaries that represent the shapes' GeoJSON geometries. MGLFeature classes can now return NSDictionaries that represent the features as GeoJSON features. This makes it trivial to serialize iOS and macOS shapes and features into GeoJSON. MGLFeature instances can also return a representation of themselves as an mbgl::Feature. This capability is used in a refactoring of the implementations of MGLGeoJSONSource to more efficiently transform MGLFeatures into mbgl::Features so they can be fed directly into mbgl::GeoJSONSource without having to round trip through NSJSONSerialization. The MGLFeature identifier is converted into the mbgl::identifier type based on the type of the identifier. The MGLFeature attributes are recursively converted into an mbgl::PropertyMap and each value is converted into one of the types that the PropertyMap's Value variant supports.
132 lines
4.3 KiB
Plaintext
132 lines
4.3 KiB
Plaintext
#import "MGLGeoJSONSource.h"
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#import "MGLSource_Private.h"
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#import "MGLFeature_Private.h"
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#import "NSURL+MGLAdditions.h"
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#include <mbgl/style/sources/geojson_source.hpp>
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NSString * const MGLGeoJSONClusterOption = @"MGLGeoJSONCluster";
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NSString * const MGLGeoJSONClusterRadiusOption = @"MGLGeoJSONClusterRadius";
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NSString * const MGLGeoJSONClusterMaximumZoomLevelOption = @"MGLGeoJSONClusterMaximumZoomLevel";
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NSString * const MGLGeoJSONMaximumZoomLevelOption = @"MGLGeoJSONMaximumZoomLevel";
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NSString * const MGLGeoJSONBufferOption = @"MGLGeoJSONBuffer";
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NSString * const MGLGeoJSONToleranceOption = @"MGLGeoJSONOptionsClusterTolerance";
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@interface MGLGeoJSONSource ()
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@property (nonatomic, readwrite) NSDictionary *options;
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@end
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@implementation MGLGeoJSONSource
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- (instancetype)initWithIdentifier:(NSString *)identifier geoJSONData:(NSData *)data options:(NS_DICTIONARY_OF(NSString *, id) *)options
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{
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if (self = [super initWithIdentifier:identifier])
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{
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_geoJSONData = data;
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_options = options;
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}
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return self;
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}
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- (instancetype)initWithIdentifier:(NSString *)identifier URL:(NSURL *)url options:(NS_DICTIONARY_OF(NSString *, id) *)options
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{
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if (self = [super initWithIdentifier:identifier])
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{
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_URL = url;
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_options = options;
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}
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return self;
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}
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- (instancetype)initWithIdentifier:(NSString *)identifier features:(NSArray<id<MGLFeature>> *)features options:(NS_DICTIONARY_OF(NSString *,id) *)options {
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if (self = [super initWithIdentifier:identifier]) {
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_features = features;
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_options = options;
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}
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return self;
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}
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- (mbgl::style::GeoJSONOptions)geoJSONOptions
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{
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auto mbglOptions = mbgl::style::GeoJSONOptions();
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if (self.options[MGLGeoJSONMaximumZoomLevelOption]) {
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id value = self.options[MGLGeoJSONMaximumZoomLevelOption];
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[self validateValue:value];
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mbglOptions.maxzoom = [value integerValue];
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}
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if (self.options[MGLGeoJSONBufferOption]) {
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id value = self.options[MGLGeoJSONBufferOption];
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[self validateValue:value];
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mbglOptions.buffer = [value integerValue];
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}
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if (self.options[MGLGeoJSONToleranceOption]) {
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id value = self.options[MGLGeoJSONToleranceOption];
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[self validateValue:value];
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mbglOptions.tolerance = [value doubleValue];
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}
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if (self.options[MGLGeoJSONClusterRadiusOption]) {
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id value = self.options[MGLGeoJSONClusterRadiusOption];
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[self validateValue:value];
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mbglOptions.clusterRadius = [value integerValue];
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}
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if (self.options[MGLGeoJSONClusterMaximumZoomLevelOption]) {
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id value = self.options[MGLGeoJSONClusterMaximumZoomLevelOption];
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[self validateValue:value];
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mbglOptions.clusterMaxZoom = [value integerValue];
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}
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if (self.options[MGLGeoJSONClusterOption]) {
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id value = self.options[MGLGeoJSONClusterOption];
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[self validateValue:value];
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mbglOptions.cluster = [value boolValue];
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}
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return mbglOptions;
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}
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- (void)validateValue:(id)value
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{
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if (! [value isKindOfClass:[NSNumber class]])
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{
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[NSException raise:@"Value not handled" format:@"%@ is not an NSNumber", value];
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}
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}
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- (std::unique_ptr<mbgl::style::Source>)mbglSource
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{
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auto source = std::make_unique<mbgl::style::GeoJSONSource>(self.identifier.UTF8String, self.geoJSONOptions);
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if (self.URL) {
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NSURL *url = self.URL.mgl_URLByStandardizingScheme;
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source->setURL(url.absoluteString.UTF8String);
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} else if (self.geoJSONData) {
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NSString *string = [[NSString alloc] initWithData:self.geoJSONData encoding:NSUTF8StringEncoding];
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const auto geojson = mapbox::geojson::parse(string.UTF8String).get<mapbox::geojson::feature_collection>();
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source->setGeoJSON(geojson);
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_features = MGLFeaturesFromMBGLFeatures(geojson);
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} else {
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mbgl::FeatureCollection featureCollection;
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featureCollection.reserve(self.features.count);
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for (id <MGLFeaturePrivate> feature in self.features) {
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featureCollection.push_back([feature mbglFeature]);
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}
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const auto geojson = mbgl::GeoJSON{featureCollection};
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source->setGeoJSON(geojson);
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_features = MGLFeaturesFromMBGLFeatures(featureCollection);
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}
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return std::move(source);
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}
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@end
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