Scene properties expressions

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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 ScenePropertiesExpressionsViewController: UIViewController {
    @IBOutlet var sceneView: AGSSceneView!
    @IBOutlet var headingLabel: UILabel!
    @IBOutlet var pitchLabel: UILabel!

    private var coneGraphic: AGSGraphic!

    override func viewDidLoad() {
        super.viewDidLoad()

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

        // Initialize scene with streets basemap style.
        let scene = AGSScene(basemapStyle: .arcGISStreets)
        // assign scene to the scene view
        self.sceneView.scene = scene

        // set the viewpoint camera
        let point = AGSPoint(x: 83.9, y: 28.4, z: 5200, spatialReference: .wgs84())
        let camera = AGSCamera(lookAt: point, distance: 1000, heading: 0, pitch: 50, roll: 0)
        self.sceneView.setViewpointCamera(camera)

        // create a graphics overlay
        let graphicsOverlay = AGSGraphicsOverlay()
        graphicsOverlay.sceneProperties?.surfacePlacement = .relative

        // add it to the scene view
        self.sceneView.graphicsOverlays.add(graphicsOverlay)

        // add renderer using rotation expressions
        let renderer = AGSSimpleRenderer()
        renderer.sceneProperties?.headingExpression = "[HEADING]"
        renderer.sceneProperties?.pitchExpression = "[PITCH]"
        graphicsOverlay.renderer = renderer

        // create a red cone graphic
        let coneSymbol = AGSSimpleMarkerSceneSymbol(style: .cone, color: .red, height: 200, width: 100, depth: 100, anchorPosition: .center)
        coneSymbol.pitch = -90  // correct symbol's default pitch
        let conePoint = AGSPoint(x: 83.9, y: 28.404, z: 5000, spatialReference: .wgs84())
        let coneAttributes = ["HEADING": 0, "PITCH": 0]
        let coneGraphic = AGSGraphic(geometry: conePoint, symbol: coneSymbol, attributes: coneAttributes)
        graphicsOverlay.graphics.add(coneGraphic)
        self.coneGraphic = coneGraphic
    }

    @IBAction func headingSliderValueChanged(_ slider: UISlider) {
        coneGraphic.attributes["HEADING"] = slider.value
        // update label
        self.headingLabel.text = "\(Int(slider.value))"
    }

    @IBAction func pitchSliderValueChanged(_ slider: UISlider) {
        coneGraphic.attributes["PITCH"] = slider.value
        // update label
        self.pitchLabel.text = "\(Int(slider.value))"
    }
}