/// <summary>
/// Samples track point heights and adjusts the track when it goes below terrain height.
/// </summary>
/// <param name="track">track to adjust point heights</param>
/// <returns>task to wait on</returns>
private static async Task AdjustTrackHeightsAsync(Track track)
{
var cts = new CancellationTokenSource();
waitingDialog = new WaitingPopupPage("Sampling track point heights...", cts);
await App.RunOnUiThreadAsync(async() => await waitingDialog.ShowAsync());
await App.InitializedTask;
try
{
var trackPointHeights =
await Task.Run(
async() => await App.MapView.SampleTrackHeights(track),
cts.Token);
if (cts.IsCancellationRequested)
{
return;
}
if (trackPointHeights != null)
{
track.GroundHeightProfile = trackPointHeights.ToList();
track.AdjustTrackPointsByGroundProfile(trackPointHeights);
}
}
finally
{
await waitingDialog.HideAsync();
waitingDialog = null;
}
}
/// <summary>
/// Closes waiting popup page when on stack (actually removes any popup page).
/// </summary>
/// <returns>task to wait on</returns>
private static async Task CloseWaitingPopupPageAsync()
{
try
{
if (waitingDialog != null)
{
await waitingDialog.HideAsync();
waitingDialog = null;
}
}
catch (Exception)
{
// ignore when there's no popup page on stack
}
}
/// <summary>
/// Samples track point heights and adjust track
/// </summary>
/// <param name="track">track to sample point heights</param>
/// <returns>task to wait on</returns>
private static async Task SampleTrackHeightsAsync(Track track)
{
waitingDialog = new WaitingPopupPage("Sampling track point heights...");
App.RunOnUiThread(async() => await waitingDialog.ShowAsync());
try
{
await App.SampleTrackHeightsAsync(track, 0.0);
}
finally
{
await waitingDialog.HideAsync();
waitingDialog = null;
}
}
