Choose camera controller

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Control the behavior of the camera in a scene.

Choose camera controller sample

Use case

The globe camera controller (the default camera controller in all new scenes) allows a user to explore the scene freely by zooming in/out and panning around the globe. The orbit camera controllers fix the camera to look at a target location or geoelement. A primary use case is for following moving objects like cars and planes.

How to use the sample

The sample loads with the default globe camera controller. To rotate and fix the scene around the plane, exit globe mode by choosing the "Orbit camera around plane" option (i.e. camera will now be fixed to the plane). Choose the "Orbit camera around crater" option to rotate and center the scene around the location of the Upheaval Dome crater structure, or choose the "Free pan round the globe" option to return to default free navigation.

How it works

  1. Create an instance of a class extending AGSCameraController: AGSGlobeCameraController, AGSOrbitLocationCameraController, AGSOrbitGeoElementCameraController.
  2. Set the cameraController property of AGSSceneView.

Relevant API

  • AGSCamera
  • AGSGlobeCameraController
  • AGSOrbitGeoElementCameraController
  • AGSOrbitLocationCameraController
  • AGSScene
  • AGSSceneView

Tags

3D, camera, camera controller

Sample Code

CameraControllerTableViewController.swiftChooseCameraControllerViewController.swift
                                                                        
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// Copyright 2019 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

protocol CameraControllerTableViewControllerDelagate: AnyObject {
    func selectedCameraControllerChanged(_ tableViewController: CameraControllerTableViewController)
}

class CameraControllerTableViewController: UITableViewController {
    weak var delegate: CameraControllerTableViewControllerDelagate?
    var cameraControllers = [AGSCameraController]()
    var selectedCameraController: AGSCameraController?

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        if let selectedCameraController = selectedCameraController, let selectedRow = cameraControllers.firstIndex(where: { type(of: $0) == type(of: selectedCameraController) }) {
            tableView.selectRow(at: IndexPath(row: selectedRow, section: 0), animated: false, scrollPosition: .none)
        }
    }

    // MARK: - UITableViewDataSource

    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return cameraControllers.count
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
        cell.textLabel?.text = getDescription(of: cameraControllers[indexPath.row])
        return cell
    }

    // MARK: - UITableViewDelegate

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        selectedCameraController = cameraControllers[indexPath.row]
        delegate?.selectedCameraControllerChanged(self)
    }

    // MARK: - Helper method

    /// Gets description of the specified camera controller.
    ///
    /// - Parameter cameraController: Camera controller of scene view.
    /// - Returns: A text description of the camera controller.
    func getDescription(of cameraController: AGSCameraController) -> String {
        if cameraController is AGSOrbitGeoElementCameraController {
            return "Orbit camera around plane"
        } else if cameraController is AGSOrbitLocationCameraController {
            return "Orbit camera around crater"
        } else {
            return "Free pan round the globe"
        }
    }
}

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