Picture marker symbols

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// Copyright 2016 Esri.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import UIKit
import ArcGIS

class PictureMarkerSymbolsViewController: UIViewController {
    @IBOutlet var mapView: AGSMapView!

    private let graphicsOverlay = AGSGraphicsOverlay()

    override func viewDidLoad() {
        super.viewDidLoad()

        // add the source code button item to the right of navigation bar
        (self.navigationItem.rightBarButtonItem as! SourceCodeBarButtonItem).filenames = ["PictureMarkerSymbolsViewController"]

        // assign the map to the map view
        self.mapView.map = AGSMap(basemapStyle: .arcGISTopographic)
        let center = AGSPoint(x: -225166.5, y: 6551249, spatialReference: .webMercator())
        self.mapView.setViewpoint(AGSViewpoint(center: center, scale: 1e5))

        // add the graphics overlay to the map view
        self.mapView.graphicsOverlays.add(graphicsOverlay)

        // add picture marker symbol using a remote image
        self.addPictureMarkerSymbolFromURL()

        // add picture marker symbol using image in assets
        self.addPictureMarkerSymbolFromImage()
    }

    private func addPictureMarkerSymbolFromURL() {
        let url = URL(string: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Recreation/FeatureServer/0/images/e82f744ebb069bb35b234b3fea46deae")!

        let campsiteSymbol = AGSPictureMarkerSymbol(url: url)

        // optionally set the size (if not set, the size in pixels of the image will be used)
        campsiteSymbol.width = 24
        campsiteSymbol.height = 24

        // location for camp site
        let campsitePoint = AGSPoint(x: -223560, y: 6552021, spatialReference: .webMercator())

        // graphic for camp site
        let graphic = AGSGraphic(geometry: campsitePoint, symbol: campsiteSymbol, attributes: nil)

        // add the graphic to the overlay
        self.graphicsOverlay.graphics.add(graphic)
    }

    private func addPictureMarkerSymbolFromImage() {
        // image name
        let imageName = "PinBlueStar"

        // create pin symbol using the image
        let pinSymbol = AGSPictureMarkerSymbol(image: UIImage(named: imageName)!)

        // change offsets, so the symbol aligns properly to the point
        pinSymbol.offsetY = pinSymbol.image!.size.height / 2

        // location for pin
        let pinPoint = AGSPoint(x: -226773, y: 6550477, spatialReference: .webMercator())

        // graphic for pin
        let graphic = AGSGraphic(geometry: pinPoint, symbol: pinSymbol, attributes: nil)

        // add the graphic to the overlay
        self.graphicsOverlay.graphics.add(graphic)
    }
}