Add point cloud layer from file

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// Copyright 2025 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
//
//   https://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 'dart:io';

import 'package:arcgis_maps/arcgis_maps.dart';
import 'package:arcgis_maps_sdk_flutter_samples/common/common.dart';
import 'package:flutter/material.dart';
import 'package:path_provider/path_provider.dart';

class AddPointCloudLayerFromFile extends StatefulWidget {
  const AddPointCloudLayerFromFile({super.key});

  @override
  State<AddPointCloudLayerFromFile> createState() =>
      _AddPointCloudLayerFromFileState();
}

class _AddPointCloudLayerFromFileState extends State<AddPointCloudLayerFromFile>
    with SampleStateSupport {
  // Create a controller for the scene view.
  final _sceneViewController = ArcGISSceneView.createController();

  // A flag for when the scene view is ready.
  var _ready = false;
  // The download progress of the sample data.
  var _downloadProgress = 0.0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        children: [
          ArcGISSceneView(
            controllerProvider: () => _sceneViewController,
            onSceneViewReady: onSceneViewReady,
          ),
          // Display a progress indicator and prevent interaction until state is ready.
          Visibility(
            visible: !_ready,
            child: Center(
              child: Column(
                spacing: 10,
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  CircularProgressIndicator(
                    value: _downloadProgress,
                    backgroundColor: Colors.white,
                    valueColor: const AlwaysStoppedAnimation<Color>(
                      Colors.blue,
                    ),
                  ),
                  Text(
                    'Downloading sample data ${(_downloadProgress * 100).toStringAsFixed(0)}%',
                    style: const TextStyle(
                      color: Colors.white,
                      fontSize: 12,
                      fontWeight: FontWeight.bold,
                    ),
                  ),
                ],
              ),
            ),
          ),
        ],
      ),
    );
  }

  Future<void> onSceneViewReady() async {
    // Add the scene to the view controller.
    _sceneViewController.arcGISScene = _setupScene();

    // Load the point cloud layer.
    await loadCloudPointLayerFromFile();
  }

  ArcGISScene _setupScene() {
    // Create a scene with an imagery basemap style.
    final scene = ArcGISScene.withBasemapStyle(BasemapStyle.arcGISImagery);

    // Set the scene's initial viewpoint.
    scene.initialViewpoint = Viewpoint.withPointScaleCamera(
      center: ArcGISPoint(x: 0, y: 0),
      scale: 1,
      camera: Camera.withLatLong(
        latitude: 32.720195,
        longitude: -117.155593,
        altitude: 1050,
        heading: 23,
        pitch: 70,
        roll: 0,
      ),
    );

    // Add surface elevation to the scene.
    final elevationSource = ArcGISTiledElevationSource.withUri(
      Uri.parse(
        'https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer',
      ),
    );
    scene.baseSurface.elevationSources.add(elevationSource);

    return scene;
  }

  Future<void> loadCloudPointLayerFromFile() async {
    // Download the sample data.
    // Get the temp directory.
    final directory = await getApplicationDocumentsDirectory();
    // Create a file reference to the scene layer package for Balboa Park, San Diego, CA.
    final sanDiegoPointCloudFile = File(
      '${directory.absolute.path}/sandiego-north-balboa-pointcloud.slpk',
    );
    if (!sanDiegoPointCloudFile.existsSync()) {
      // If the file does not exist, download it.
      await downloadSampleDataWithProgress(
        itemIds: ['34da965ca51d4c68aa9b3a38edb29e00'],
        destinationFiles: [sanDiegoPointCloudFile],
        onProgress: (progress) {
          setState(() => _downloadProgress = progress);
        },
      );
    }

    // Create a Point Cloud Layer from the file URI.
    final pointCloudLayer = PointCloudLayer.withUri(sanDiegoPointCloudFile.uri);
    await pointCloudLayer.load();
    // Add the point cloud layer to the map's operational layers.
    _sceneViewController.arcGISScene?.operationalLayers.add(pointCloudLayer);
    // Set the ready state variable to true to enable the sample UI.
    setState(() => _ready = true);
  }
}