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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 ListTransformationsViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
@IBOutlet var mapView: AGSMapView!
@IBOutlet var tableView: UITableView!
@IBOutlet var orderByMapExtent: UISwitch!
var datumTransformations = [AGSDatumTransformation]()
var defaultTransformation: AGSDatumTransformation?
let graphicsOverlay = AGSGraphicsOverlay()
var originalGeometry = AGSPoint(x: 538985.355, y: 177329.516, spatialReference: AGSSpatialReference(wkid: 27700))
var projectedGraphic: AGSGraphic? {
if graphicsOverlay.graphics.count > 1 {
return graphicsOverlay.graphics.lastObject as? AGSGraphic
} else {
return nil
}
}
override func viewDidLoad() {
super.viewDidLoad()
// Add the source code button item to the right of navigation bar.
(self.navigationItem.rightBarButtonItem as! SourceCodeBarButtonItem).filenames = ["ListTransformationsViewController"]
// Get MapView from layout and set a map into this view
mapView.map = AGSMap(basemapStyle: .arcGISLightGrayBase)
mapView.graphicsOverlays.add(graphicsOverlay)
// add original graphic to overlay
addGraphic(originalGeometry, color: .red, style: .square)
mapView.map?.load { [weak self] (error) in
if let error = error {
print("map load error = \(error)")
} else {
self?.mapDidLoad()
}
}
}
func mapDidLoad() {
mapView.setViewpoint(AGSViewpoint(center: originalGeometry, scale: 5000), duration: 2.0, completion: nil)
// set the url for our projection engine data;
setPEDataURL()
}
// add a graphic with the given geometry, color and style to the graphics overlay
func addGraphic(_ geometry: AGSGeometry, color: UIColor, style: AGSSimpleMarkerSymbolStyle) {
let sms = AGSSimpleMarkerSymbol(style: style, color: color, size: 15.0)
graphicsOverlay.graphics.add(AGSGraphic(geometry: geometry, symbol: sms, attributes: nil))
}
// set up our datumTransformations array
func setupTransformsList() {
guard let map = mapView.map,
let inputSR = originalGeometry.spatialReference,
let outputSR = map.spatialReference else { return }
// if orderByMapExtent is on, use the map extent when retrieving the transformations
if orderByMapExtent.isOn {
datumTransformations = AGSTransformationCatalog.transformationsBySuitability(withInputSpatialReference: inputSR, outputSpatialReference: outputSR, areaOfInterest: mapView.visibleArea?.extent)
} else {
datumTransformations = AGSTransformationCatalog.transformationsBySuitability(withInputSpatialReference: inputSR, outputSpatialReference: outputSR)
}
defaultTransformation = AGSTransformationCatalog.transformation(forInputSpatialReference: inputSR, outputSpatialReference: outputSR)
// unselect selected row
if let selectedIndexPath = tableView.indexPathForSelectedRow {
tableView.deselectRow(at: selectedIndexPath, animated: true)
}
// remove projected graphic from overlay
if let graphic = projectedGraphic {
// we have the projected graphic, remove it (it's always the last one)
graphicsOverlay.graphics.remove(graphic)
}
tableView.reloadData()
}
func setPEDataURL() {
if let projectionEngineDataURL = FileManager.default
.urls(for: .documentDirectory, in: .userDomainMask)
.first?.appendingPathComponent("PEDataRuntime") {
do {
guard try projectionEngineDataURL.checkResourceIsReachable() else { return }
// Normally, this method would be called immediately upon application startup before any other API method calls.
// So usually it would be called from AppDelegate.application(_:didFinishLaunchingWithOptions:), but for the purposes
// of this sample, we're calling it here.
try AGSTransformationCatalog.setProjectionEngineDirectory(projectionEngineDataURL)
} catch {
print("Could not load projection engine data. See the README file for instructions on adding PE data to your app.")
}
}
setupTransformsList()
}
@IBAction func oderByMapExtentValueChanged(_ sender: Any) {
setupTransformsList()
}
// MARK: - TableView data source
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return datumTransformations.count
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "DatumTransformCell", for: indexPath)
// get the selected transformation
let transformation = datumTransformations[indexPath.row]
// disable selection if the transformation is missing files
cell.isUserInteractionEnabled = !transformation.isMissingProjectionEngineFiles
cell.textLabel?.text = transformation.name
cell.detailTextLabel?.text = {
if transformation.isMissingProjectionEngineFiles,
// if we're missing the grid files, detail which ones
let geographicTransformation = transformation as? AGSGeographicTransformation {
let files = geographicTransformation.steps.flatMap { (step) -> [String] in
step.isMissingProjectionEngineFiles ? step.projectionEngineFilenames : []
}
return "Missing grid files: \(files.joined(separator: ", "))"
} else {
return ""
}
}()
return cell
}
// MARK: - TableView delegates
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
guard let mapViewSR = mapView.spatialReference else { return }
let selectedTransform = datumTransformations[indexPath.row]
if let projectedGeometry = AGSGeometryEngine.projectGeometry(originalGeometry, to: mapViewSR, datumTransformation: selectedTransform) {
// projectGeometry succeeded
if let graphic = projectedGraphic {
// we've already added the projected graphic
graphic.geometry = projectedGeometry
} else {
// add projected graphic
addGraphic(projectedGeometry, color: .blue, style: .cross)
}
} else {
// If a transformation is missing grid files, then it cannot be
// successfully used to project a geometry, and "projectGeometry" will return nil.
// In that case, remove projected graphic
if graphicsOverlay.graphics.count > 1 {
graphicsOverlay.graphics.removeLastObject()
}
}
}
}
