Raster colorization
RasterColorExample.swift
import MapboxMaps
import UIKit
final class ViewController: UIViewController {
private var cancelables = Set<AnyCancelable>()
private var mapView: MapView!
private var isTileRequestDelayEnabled = false
private let button = UIButton(type: .system)
private let sourceId = "raster-source"
override func viewDidLoad() {
super.viewDidLoad()
// Initialize a `MapView` that is centered over the southeastern United States.
let centerCoordinate = CLLocationCoordinate2D(latitude: 40, longitude: -74.5)
let cameraOptions = CameraOptions(center: centerCoordinate, zoom: 2)
let mapInitOptions = MapInitOptions(cameraOptions: cameraOptions)
mapView = MapView(frame: view.bounds, mapInitOptions: mapInitOptions)
mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
view.addSubview(mapView)
// Once the map has finished loading, add the `RasterSource` and `RasterLayer` to the map's style.
mapView.mapboxMap.onMapLoaded.observeNext { _ in
self.setupExample()
}.store(in: &cancelables)
}
func setupExample() {
var rasterSource = RasterSource(id: "raster-source-id")
rasterSource.url = "mapbox://mapbox.terrain-rgb"
rasterSource.tileSize = 256
var backgroundLayer = BackgroundLayer(id: "background-layer-id")
backgroundLayer.backgroundColor = .constant(StyleColor(red: 4.0, green: 7.0, blue: 14.0, alpha: 1)!)
var rasterLayer = RasterLayer(id: "raster-layer-id", source: rasterSource.id)
rasterLayer.rasterColor = .expression(Exp(.interpolate) {
Exp(.linear)
Exp(.rasterValue)
35.392
"rgb(48, 167, 228)"
44.24
"rgb(57, 143, 83)"
274.288
"rgb(116, 166, 129)"
486.64
"rgb(178, 205, 174)"
672.448
"rgb(188, 195, 169)"
955.584
"rgb(221, 207, 153)"
1353.744
"rgb(211, 174, 114)"
1813.84
"rgb(207, 155, 103)"
2450.896
"rgb(179, 120, 85)"
3318
"rgb(227, 210, 197)"
5839.68
"rgb(255, 255, 255)"
})
rasterLayer.rasterColorMix = .constant([
1667721.6,
6553.6,
25.6,
-10000
])
rasterLayer.rasterColorRange = .constant([0, 8848])
do {
try mapView.mapboxMap.addLayer(backgroundLayer)
try mapView.mapboxMap.addLayer(rasterLayer)
try mapView.mapboxMap.addSource(rasterSource)
} catch {
print(error)
}
}
}
このexampleは役に立ちましたか？