private ExportTileCacheParameters GetExportParameters()
{
// Create a new parameters instance.
ExportTileCacheParameters parameters = new ExportTileCacheParameters();
// Get the (only) graphics overlay in the map view.
GraphicsOverlay extentOverlay = MyMapView.GraphicsOverlays.First();
// Get the area selection graphic's extent.
Graphic extentGraphic = extentOverlay.Graphics.First();
// Set the area for the export.
parameters.AreaOfInterest = extentGraphic.Geometry;
// Set the highest possible export quality.
parameters.CompressionQuality = 100;
// Add level IDs 1-9.
// Note: Failing to add at least one Level ID will result in job failure.
for (int x = 1; x < 10; x++)
{
parameters.LevelIds.Add(x);
}
// Return the parameters.
return(parameters);
}
private void ConfigureTileLayerOverrides(GenerateOfflineMapParameterOverrides overrides)
{
// Create a parameter key for the first basemap layer.
OfflineMapParametersKey basemapKey = new OfflineMapParametersKey(MyMapView.Map.Basemap.BaseLayers.First());
// Get the export tile cache parameters for the layer key.
ExportTileCacheParameters basemapParams = overrides.ExportTileCacheParameters[basemapKey];
// Clear the existing level IDs.
basemapParams.LevelIds.Clear();
// Get the min and max scale from the UI.
int minScale = (int)MinScaleEntry.Value;
int maxScale = (int)MaxScaleEntry.Value;
// Re-add selected scales.
for (int i = minScale; i < maxScale; i++)
{
basemapParams.LevelIds.Add(i);
}
// Expand the area of interest based on the specified buffer distance.
int bufferDistance = (int)ExtentBufferEntry.Value;
basemapParams.AreaOfInterest = GeometryEngine.BufferGeodetic(_areaOfInterest, bufferDistance, LinearUnits.Meters);
}
/// <summary>
/// Starts the export job and registers callbacks to be notified of changes to job status
/// </summary>
private async void StartExport()
{
// Update the tile cache path
_tilePath = GetTilePath();
// Get the parameters for the job
ExportTileCacheParameters parameters = GetExportParameters();
// Create the task
ExportTileCacheTask exportTask = await ExportTileCacheTask.CreateAsync(_serviceUri);
// Create the export job
ExportTileCacheJob job = exportTask.ExportTileCache(parameters, _tilePath);
// Subscribe to notifications for status updates
job.JobChanged += Job_JobChanged;
// Start the export job
job.Start();
}
private void ConfigureTileLayerOverrides()
{
// Create a parameter key for the first basemap layer.
OfflineMapParametersKey basemapKey = new OfflineMapParametersKey(_map.Basemap.BaseLayers.First());
// Get the export tile cache parameters for the layer key.
ExportTileCacheParameters basemapParams = _overrides.ExportTileCacheParameters[basemapKey];
// Clear the existing level IDs.
basemapParams.LevelIds.Clear();
// Re-add selected scales.
for (int i = _minScale; i < _maxScale; i++)
{
basemapParams.LevelIds.Add(i);
}
// Expand the area of interest based on the specified buffer distance.
basemapParams.AreaOfInterest = GeometryEngine.BufferGeodetic(_areaOfInterest, _bufferExtent, LinearUnits.Meters);
}
private async Task ExportTilesAsync(Geometry area, string downloadFolderPath, Uri uri)
{
var offlineTask = await ExportTileCacheTask.CreateAsync(uri);
var parameters = new ExportTileCacheParameters
{
AreaOfInterest = area,
CompressionQuality = 100
};
parameters.LevelIds.Add(4);
parameters.LevelIds.Add(6);
parameters.LevelIds.Add(8);
parameters.LevelIds.Add(12);
var job = offlineTask.ExportTileCache(parameters, downloadFolderPath + ".tpk");
job.Start();
await job.GetResultAsync();
}
private async Task StartExport()
{
// Get the parameters for the job.
ExportTileCacheParameters parameters = GetExportParameters();
// Create the task.
ExportTileCacheTask exportTask = await ExportTileCacheTask.CreateAsync(_serviceUri);
// Get the tile cache path.
_tilePath = $"{Path.GetTempFileName()}.tpk";
// Create the export job.
ExportTileCacheJob job = exportTask.ExportTileCache(parameters, _tilePath);
// Start the export job.
job.Start();
// Get the result.
TileCache cache = await job.GetResultAsync();
// Do the rest of the work.
await HandleExportComplete(job, cache);
}
private async Task StartExport()
{
// Get the parameters for the job.
ExportTileCacheParameters parameters = GetExportParameters();
// Create the task.
ExportTileCacheTask exportTask = await ExportTileCacheTask.CreateAsync(_serviceUri);
// Get the tile cache path.
string tilePath = Path.Combine(Environment.ExpandEnvironmentVariables("%TEMP%"), Path.GetTempFileName() + ".tpk");
// Create the export job.
ExportTileCacheJob job = exportTask.ExportTileCache(parameters, tilePath);
// Start the export job.
job.Start();
// Wait for the job to complete.
TileCache resultTileCache = await job.GetResultAsync();
// Do the rest of the work.
await HandleExportCompleted(job, resultTileCache);
}
private async Task StartExport()
{
try
{
// Update the tile cache path.
_tilePath = $"{Path.GetTempFileName()}.tpk";
// Get the parameters for the job.
ExportTileCacheParameters parameters = GetExportParameters();
// Create the task.
ExportTileCacheTask exportTask = await ExportTileCacheTask.CreateAsync(_serviceUri);
// Create the export job.
ExportTileCacheJob job = exportTask.ExportTileCache(parameters, _tilePath);
// Show the progress bar.
MyProgressBar.IsVisible = true;
// Start the export job.
job.Start();
// Get the tile cache result.
TileCache resultTileCache = await job.GetResultAsync();
// Hide the progress bar.
MyProgressBar.IsVisible = false;
// Do the rest of the work.
await HandleJobCompletion(job, resultTileCache);
}
catch (Exception ex)
{
await((Page)Parent).DisplayAlert("Error", ex.ToString(), "OK");
}
}
