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// Copyright 2018 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 DensifyAndGeneralizeViewController: UIViewController {
@IBOutlet var mapView: AGSMapView!
/// The overlay for which to display the graphics.
private let graphicsOverlay = AGSGraphicsOverlay()
/// The base geometry that is densified and generalized.
private let originalPolyline: AGSPolyline
/// The graphics for displaying the points of the resultant geometry.
private let resultPointsGraphic: AGSGraphic = {
let graphic = AGSGraphic()
graphic.symbol = AGSSimpleMarkerSymbol(style: .circle, color: .magenta, size: 7)
return graphic
}()
/// The graphic for displaying the lines of the resultant geometry.
private let resultPolylineGraphic: AGSGraphic = {
let graphic = AGSGraphic()
graphic.symbol = AGSSimpleLineSymbol(style: .solid, color: .magenta, width: 3)
return graphic
}()
private var shouldGeneralize = false
private var maxDeviation = 10.0
private var shouldDensify = false
private var maxSegmentLength = 100.0
required init?(coder aDecoder: NSCoder) {
let spatialReference = AGSSpatialReference(wkid: 32126)
/// The base collection of points from which the original polyline and mulitpoint
/// geometries are made.
let collection = AGSMutablePointCollection(spatialReference: spatialReference)
collection.addPointWith(x: 2330611.130549, y: 202360.002957)
collection.addPointWith(x: 2330583.834672, y: 202525.984012)
collection.addPointWith(x: 2330574.164902, y: 202691.488009)
collection.addPointWith(x: 2330689.292623, y: 203170.045888)
collection.addPointWith(x: 2330696.773344, y: 203317.495798)
collection.addPointWith(x: 2330691.419723, y: 203380.917080)
collection.addPointWith(x: 2330435.065296, y: 203816.662457)
collection.addPointWith(x: 2330369.500800, y: 204329.861789)
collection.addPointWith(x: 2330400.929891, y: 204712.129673)
collection.addPointWith(x: 2330484.300447, y: 204927.797132)
collection.addPointWith(x: 2330514.469919, y: 205000.792463)
collection.addPointWith(x: 2330638.099138, y: 205271.601116)
collection.addPointWith(x: 2330725.315888, y: 205631.231308)
collection.addPointWith(x: 2330755.640702, y: 206433.354860)
collection.addPointWith(x: 2330680.644719, y: 206660.240923)
collection.addPointWith(x: 2330386.957926, y: 207340.947204)
collection.addPointWith(x: 2330485.861737, y: 207742.298501)
// create the base geometries
originalPolyline = AGSPolyline(points: collection.array())
let multipoint = AGSMultipoint(points: collection.array())
// create graphics for displaying the base points and lines
let originalPolylineGraphic = AGSGraphic(geometry: originalPolyline, symbol: AGSSimpleLineSymbol(style: .dot, color: .red, width: 3))
let originalPointsGraphic = AGSGraphic(geometry: multipoint, symbol: AGSSimpleMarkerSymbol(style: .circle, color: .red, size: 7))
// add the graphics in the order we want them to appear, back to front
graphicsOverlay.graphics.addObjects(from: [
originalPointsGraphic,
originalPolylineGraphic,
resultPointsGraphic,
resultPolylineGraphic
])
super.init(coder: aDecoder)
}
override func viewDidLoad() {
super.viewDidLoad()
// add the source code button item to the right of navigation bar
(navigationItem.rightBarButtonItem as! SourceCodeBarButtonItem).filenames = [
"DensifyAndGeneralizeViewController",
"GeneralizeSettingsViewController"
]
// initialize map with basemap
let map = AGSMap(basemapStyle: .arcGISStreetsNight)
// assign map to map view
mapView.map = map
// add the graphics overlay to the map view
mapView.graphicsOverlays.add(graphicsOverlay)
// set the initial viewpoint to show the extent of the graphics
mapView.setViewpointGeometry(originalPolyline.extent, padding: 100)
}
private func updateGraphicsForDensifyAndGeneralize() {
var resultPolyline = originalPolyline
if shouldGeneralize {
// generalize the polyline with the specified max deviation
resultPolyline = AGSGeometryEngine.generalizeGeometry(
resultPolyline,
maxDeviation: maxDeviation,
removeDegenerateParts: true
) as! AGSPolyline
}
if shouldDensify {
// densify the points of the polyline with the specified max segment length
resultPolyline = AGSGeometryEngine.densifyGeometry(
resultPolyline,
maxSegmentLength: maxSegmentLength
) as! AGSPolyline
}
// get the result points in an array
let points = resultPolyline.parts.array().flatMap { $0.points.array() }
// create a multipoint geometry from the result points
let resultMultipoint = AGSMultipoint(points: points)
// update the result graphics with the result geometries
resultPolylineGraphic.geometry = resultPolyline
resultPointsGraphic.geometry = resultMultipoint
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let controller = segue.destination as? GeneralizeSettingsViewController {
// fill the model values in the settings controller
controller.shouldGeneralize = shouldGeneralize
controller.shouldDensify = shouldDensify
controller.maxSegmentLength = maxSegmentLength
controller.maxDeviation = maxDeviation
// register to receive value change callbacks
controller.delegate = self
// setup the controller to display as a popover
controller.presentationController?.delegate = self
controller.preferredContentSize = CGSize(width: 300, height: 250)
}
}
}
extension DensifyAndGeneralizeViewController: GeneralizeSettingsViewControllerDelegate {
func generalizeSettingsViewControllerDidUpdate(_ generalizeSettingsViewController: GeneralizeSettingsViewController) {
// update the model with the new values
shouldDensify = generalizeSettingsViewController.shouldDensify
shouldGeneralize = generalizeSettingsViewController.shouldGeneralize
maxSegmentLength = generalizeSettingsViewController.maxSegmentLength
maxDeviation = generalizeSettingsViewController.maxDeviation
// update the graphics for the new values
updateGraphicsForDensifyAndGeneralize()
}
}
extension DensifyAndGeneralizeViewController: UIAdaptivePresentationControllerDelegate {
func adaptivePresentationStyle(for controller: UIPresentationController, traitCollection: UITraitCollection) -> UIModalPresentationStyle {
return .none
}
}
