Mapa choropletowa to rodzaj mapy tematycznej, na której
lub zacieniony zależnie od wartości danych. Za pomocą
FeatureLayerStyle, aby określić styl mapy na podstawie danych,
obszar administracyjny jest powiązany z zakresem wartości liczbowych.
W tym przykładzie dane składają się z tablicy par klucz-wartość pasujących do wyświetlana nazwa każdego stanu z liczbową wartością populacji.
Swift
//..
let featureLayer = mapView.featureLayer(of: FeatureType.administrativeAreaLevel1)
let populationOfStates = [
"ChIJdf5LHzR_hogR6czIUzU0VV4": 5_039_877,
"ChIJG8CuwJzfAFQRNduKqSde27w": 732673,
"ChIJaxhMy-sIK4cRcc3Bf7EnOUI": 7_276_316,
"ChIJYSc_dD-e0ocR0NLf_z5pBaQ": 3_025_891,
"ChIJPV4oX_65j4ARVW8IJ6IJUYs": 39_237_836, // California
"ChIJt1YYm3QUQIcR_6eQSTGDVMc": 5_812_069,
"ChIJpVER8hFT5okR5XBhBVttmq4": 3_605_597,
"ChIJO9YMTXYFx4kReOgEjBItHZQ": 1_003_384,
"ChIJvypWkWV2wYgR0E7HW9MTLvc": 21_781_128,
"ChIJV4FfHcU28YgR5xBP7BC8hGY": 10_799_566,
"ChIJBeB5Twbb_3sRKIbMdNKCd0s": 1_441_553,
"ChIJ6Znkhaj_WFMRWIf3FQUwa9A": 1_900_923,
"ChIJGSZubzgtC4gRVlkRZFCCFX8": 12_671_469,
"ChIJHRv42bxQa4gRcuwyy84vEH4": 6_805_985,
"ChIJGWD48W9e7ocR2VnHV0pj78Y": 3_193_079,
"ChIJawF8cXEXo4cRXwk-S6m0wmg": 2_934_582,
"ChIJyVMZi0xzQogR_N_MxU5vH3c": 4_509_394,
"ChIJZYIRslSkIIYRA0flgTL3Vck": 4_624_047,
"ChIJ1YpTHd4dsEwR0KggZ2_MedY": 1_372_247,
"ChIJ35Dx6etNtokRsfZVdmU3r_I": 6_165_129,
"ChIJ_b9z6W1l44kRHA2DVTbQxkU": 6_984_723,
"ChIJEQTKxz2qTE0Rs8liellI3Zc": 10_050_811,
"ChIJmwt4YJpbWE0RD6L-EJvJogI": 5_707_390,
"ChIJGdRK5OQyKIYR2qbc6X8XDWI": 2_949_965,
"ChIJfeMiSNXmwIcRcr1mBFnEW7U": 6_168_187,
"ChIJ04p7LZwrQVMRGGwqz1jWcfU": 1_104_271,
"ChIJ7fwMtciNk4cRxArzDwyQJ6E": 1_963_692,
"ChIJcbTe-KEKmYARs5X8qooDR88": 3_143_991,
"ChIJ66bAnUtEs0wR64CmJa8CyNc": 1_388_992,
"ChIJn0AAnpX7wIkRjW0_-Ad70iw": 9_267_130,
"ChIJqVKY50NQGIcRup41Yxpuv0Y": 2_115_877,
"ChIJqaUj8fBLzEwRZ5UY3sHGz90": 19_835_913,
"ChIJgRo4_MQfVIgRGa4i6fUwP60": 10_551_162,
"ChIJY-nYVxKD11IRyc9egzmahA0": 774948,
"ChIJwY5NtXrpNogRFtmfnDlkzeU": 11_780_017,
"ChIJnU-ssRE5rIcRSOoKQDPPHF0": 3_986_639,
"ChIJVWqfm3xuk1QRdrgLettlTH0": 4_246_155,
"ChIJieUyHiaALYgRPbQiUEchRsI": 12_964_056,
"ChIJD9cOYhQ15IkR5wbB57wYTh4": 1_095_610,
"ChIJ49ExeWml-IgRnhcF9TKh_7k": 5_190_705,
"ChIJpTjphS1DfYcRt6SGMSnW8Ac": 895376,
"ChIJA8-XniNLYYgRVpGBpcEgPgM": 6_975_218,
"ChIJSTKCCzZwQIYRPN4IGI8c6xY": 29_527_941,
"ChIJzfkTj8drTIcRP0bXbKVK370": 3_337_975,
"ChIJ_87aSGzctEwRtGtUNnSJTSY": 645570,
"ChIJzbK8vXDWTIgRlaZGt0lBTsA": 8_642_274,
"ChIJ-bDD5__lhVQRuvNfbGh4QpQ": 7_738_692,
"ChIJRQnL1KVUSogRQzrN3mjHALs": 1_782_959,
"ChIJr-OEkw_0qFIR1kmG-LjV1fI": 5_895_908,
"ChIJaS7hSDTiXocRLzh90nkisCY": 578803, // Wyoming
]
featureLayer.style = { feature in
FeatureStyle(
fill: populationOfStates[feature.placeID].map {
UIColor(
hue: log(CGFloat($0) / 5e5) / 7.5,
saturation: 1,
brightness: 0.75,
alpha: 0.5)
} ?? nil,
stroke: nil,
strokeWidth: 0
)
}
self.view = mapView
Objective-C
//..
GMSFeatureLayer<GMSPlaceFeature *> *featureLayer =
[mapView featureLayerOfFeatureType:GMSFeatureTypeAdministrativeAreaLevel1];
NSDictionary<NSString *, NSNumber *> *populationOfStates = @{
@"ChIJdf5LHzR_hogR6czIUzU0VV4" : @(5039877),
@"ChIJG8CuwJzfAFQRNduKqSde27w" : @(732673),
@"ChIJaxhMy-sIK4cRcc3Bf7EnOUI" : @(7276316),
@"ChIJYSc_dD-e0ocR0NLf_z5pBaQ" : @(3025891),
@"ChIJPV4oX_65j4ARVW8IJ6IJUYs" : @(39237836), // California
@"ChIJt1YYm3QUQIcR_6eQSTGDVMc" : @(5812069),
@"ChIJpVER8hFT5okR5XBhBVttmq4" : @(3605597),
@"ChIJO9YMTXYFx4kReOgEjBItHZQ" : @(1003384),
@"ChIJvypWkWV2wYgR0E7HW9MTLvc" : @(21781128),
@"ChIJV4FfHcU28YgR5xBP7BC8hGY" : @(10799566),
@"ChIJBeB5Twbb_3sRKIbMdNKCd0s" : @(1441553),
@"ChIJ6Znkhaj_WFMRWIf3FQUwa9A" : @(1900923),
@"ChIJGSZubzgtC4gRVlkRZFCCFX8" : @(12671469),
@"ChIJHRv42bxQa4gRcuwyy84vEH4" : @(6805985),
@"ChIJGWD48W9e7ocR2VnHV0pj78Y" : @(3193079),
@"ChIJawF8cXEXo4cRXwk-S6m0wmg" : @(2934582),
@"ChIJyVMZi0xzQogR_N_MxU5vH3c" : @(4509394),
@"ChIJZYIRslSkIIYRA0flgTL3Vck" : @(4624047),
@"ChIJ1YpTHd4dsEwR0KggZ2_MedY" : @(1372247),
@"ChIJ35Dx6etNtokRsfZVdmU3r_I" : @(6165129),
@"ChIJ_b9z6W1l44kRHA2DVTbQxkU" : @(6984723),
@"ChIJEQTKxz2qTE0Rs8liellI3Zc" : @(10050811),
@"ChIJmwt4YJpbWE0RD6L-EJvJogI" : @(5707390),
@"ChIJGdRK5OQyKIYR2qbc6X8XDWI" : @(2949965),
@"ChIJfeMiSNXmwIcRcr1mBFnEW7U" : @(6168187),
@"ChIJ04p7LZwrQVMRGGwqz1jWcfU" : @(1104271),
@"ChIJ7fwMtciNk4cRxArzDwyQJ6E" : @(1963692),
@"ChIJcbTe-KEKmYARs5X8qooDR88" : @(3143991),
@"ChIJ66bAnUtEs0wR64CmJa8CyNc" : @(1388992),
@"ChIJn0AAnpX7wIkRjW0_-Ad70iw" : @(9267130),
@"ChIJqVKY50NQGIcRup41Yxpuv0Y" : @(2115877),
@"ChIJqaUj8fBLzEwRZ5UY3sHGz90" : @(19835913),
@"ChIJgRo4_MQfVIgRGa4i6fUwP60" : @(10551162),
@"ChIJY-nYVxKD11IRyc9egzmahA0" : @(774948),
@"ChIJwY5NtXrpNogRFtmfnDlkzeU" : @(11780017),
@"ChIJnU-ssRE5rIcRSOoKQDPPHF0" : @(3986639),
@"ChIJVWqfm3xuk1QRdrgLettlTH0" : @(4246155),
@"ChIJieUyHiaALYgRPbQiUEchRsI" : @(12964056),
@"ChIJD9cOYhQ15IkR5wbB57wYTh4" : @(1095610),
@"ChIJ49ExeWml-IgRnhcF9TKh_7k" : @(5190705),
@"ChIJpTjphS1DfYcRt6SGMSnW8Ac" : @(895376),
@"ChIJA8-XniNLYYgRVpGBpcEgPgM" : @(6975218),
@"ChIJSTKCCzZwQIYRPN4IGI8c6xY" : @(29527941),
@"ChIJzfkTj8drTIcRP0bXbKVK370" : @(3337975),
@"ChIJ_87aSGzctEwRtGtUNnSJTSY" : @(645570),
@"ChIJzbK8vXDWTIgRlaZGt0lBTsA" : @(8642274),
@"ChIJ-bDD5__lhVQRuvNfbGh4QpQ" : @(7738692),
@"ChIJRQnL1KVUSogRQzrN3mjHALs" : @(1782959),
@"ChIJr-OEkw_0qFIR1kmG-LjV1fI" : @(5895908),
@"ChIJaS7hSDTiXocRLzh90nkisCY" : @(578803), // Wyoming
};
featureLayer.style = ^(GMSPlaceFeature *feature) {
NSNumber *population = populationOfStates[feature.placeID];
UIColor *fillColor = population ? [UIColor colorWithHue:(log(population.doubleValue / 5e5) / 7.5) saturation:1 brightness:0.5 alpha:0.5] : nil;
return [GMSFeatureStyle styleWithFillColor:fillColor strokeColor:nil strokeWidth:0.0];
};
self.view = mapView;