/// <summary>
/// Save a given map tile to an Mbtiles file
/// </summary>
/// <param name="tileSource"></param>
/// <param name="tileInfo"></param>
/// <param name="dbpath"></param>
/// <param name="layer"></param>
public static void saveTile(ITileSource tileSource, TileInfo tileInfo, string dbpath, BioDivCollectorXamarin.Models.DatabaseModel.Layer layer)
{
if (!Mbtiles.TileExists(tileInfo, dbpath))
{
try
{
var tile = tileSource.GetTile(tileInfo);
Mbtiles.PopulateMbtilesWith(tile, tileInfo, dbpath);
}
catch (Exception e)
{
Console.WriteLine(e);
}
finally
{
MessagingCenter.Send <Application>(App.Current, "TileSavedInternal");
}
}
else
{
MessagingCenter.Send <Application>(App.Current, "TileSavedInternal");
}
}
/// <summary>
/// Save each of the map layers on-screen (the extent is provided by the screen edges) to an mbtiles file
/// </summary>
/// <param name="extent"></param>
public static async void saveMaps(Extent extent)
{
var basemap = Preferences.Get("BaseLayer", "swisstopo_pixelkarte"); //Check which basemap
var cancel = false;
MessagingCenter.Subscribe <Application>(App.Current, "CancelMapSave", (sender) =>
{
//Listen for tile save updates and update the count
cancel = true;
});
//Get the online layers
var layers = GetLayersForMap(App.CurrentProjectId);
//Create an array for adding the layers into in an ordered fashion
var mapLayersTemp = new MapLayer[layers.Count];
//Add online wms layers
var layerStack = layers.OrderBy(o => o.order).ToList();
//Calculate number of tiles
var noOfLayers = 0;
//Calculate number of tiles
long noOfTiles = 0;
foreach (var layer in layerStack)
{
if (layer.visible)
{
var tileSource = WMSLayer.CreateTileSource(layer.url, layer.wmsLayer, "EPSG:3857");
foreach (var zoomScale in tileSource.Schema.Resolutions)
{
var tileInfos = tileSource.Schema.GetTileInfos(extent, zoomScale.Value.UnitsPerPixel);
noOfTiles = noOfTiles + tileInfos.Count();
}
noOfLayers++;
}
}
if (basemap == "swisstopo_pixelkarte")
{
string swisstopoDbpath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "mbtiles/swisstopo.mbtiles");
TileLayer swisstopo = WMSLayer.CreatePixelkarteWMTSTileLayer();
foreach (var zoomScale in swisstopo.TileSource.Schema.Resolutions)
{
var stTileInfos = swisstopo.TileSource.Schema.GetTileInfos(extent, zoomScale.Value.UnitsPerPixel);
noOfTiles = noOfTiles + stTileInfos.Count();
}
}
else if (basemap == "swissimage")
{
string swisstopoDbpath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "mbtiles/swissimage.mbtiles");
TileLayer swisstopo = WMSLayer.CreateSwissimageWMTSTileLayer();
foreach (var zoomScale in swisstopo.TileSource.Schema.Resolutions)
{
var stTileInfos = swisstopo.TileSource.Schema.GetTileInfos(extent, zoomScale.Value.UnitsPerPixel);
noOfTiles = noOfTiles + stTileInfos.Count();
}
}
else
{
string osmDbpath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "mbtiles/osm.mbtiles");
TileLayer osm = OpenStreetMap.CreateTileLayer();
foreach (var zoomScale in osm.TileSource.Schema.Resolutions)
{
var osmTileInfos = osm.TileSource.Schema.GetTileInfos(extent, zoomScale.Value.UnitsPerPixel);
noOfTiles = noOfTiles + osmTileInfos.Count();
}
}
Console.WriteLine(noOfTiles + " tiles in " + (noOfLayers + 1) + " layers");
//Save tiles
long tilesSaved = 0;
MessagingCenter.Subscribe <Application>(App.Current, "TileSavedInternal", (sender) =>
{
//Listen for tile save updates and update the count
var message = tilesSaved + " von " + noOfTiles + " Kacheln aus " + (noOfLayers + 1) + " Ebenen gespeichert";
if (noOfLayers == 0)
{
message = tilesSaved + " von " + noOfTiles + " Kacheln aus " + (noOfLayers + 1) + " Ebene gespeichert";
}
Console.WriteLine(message);
MessagingCenter.Send <Application, string>(App.Current, "TileSaved", message);
if (tilesSaved >= noOfTiles - 5 || cancel)
{
MessagingCenter.Send <Application, string>(App.Current, "TileSaved", String.Empty);
MessagingCenter.Unsubscribe <Application>(App.Current, "TileSavedInternal");
MapModel.MakeArrayOfLayers();
}
});
var tasks = new List <Task>(); // Each layer has to be saved in a single thread due to database access, but we can save layers concurrently
foreach (var layer in layerStack)
{
if (cancel)
{
break;
}
if (layer.visible)
{
var layerNo = Math.Max(layers.Count - layer.order, 0);
var tileSource = WMSLayer.CreateTileSource(layer.url, layer.wmsLayer, "EPSG:3857");
string dbpath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "mbtiles/" + layer.title + ".mbtiles");
//extent = tileSource.Schema.Extent;
var layerTask = Task.Run(async() =>
{
//Create the database
Mbtiles.CreateMbTiles(dbpath, layer, tileSource);
//Populate the database
foreach (var zoomScale in tileSource.Schema.Resolutions)
{
if (cancel)
{
break;
}
await Task.Run(async() =>
{
var tileInfos = tileSource.Schema.GetTileInfos(extent, zoomScale.Value.UnitsPerPixel);
foreach (var tileInfo in tileInfos)
{
if (cancel)
{
break;
}
await Task.Run(() =>
{
tilesSaved++;
saveTile(tileSource, tileInfo, dbpath, layer);
});
}
});
}
Console.WriteLine("Saving of 1 layer complete");
});
tasks.Add(layerTask);
}
}
//Swisstopo layer
var task = Task.Run(async() =>
{
string baselayerDbsavepath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "mbtiles/swisstopo_pixelkarte.mbtiles");
TileLayer baselayer = WMSLayer.CreatePixelkarteWMTSTileLayer();
//Create the database
var baseLayer = new BioDivCollectorXamarin.Models.DatabaseModel.Layer();
baseLayer.title = "swisstopo pixelkarte";
if (basemap == "osm") //OSM case
{
baselayerDbsavepath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "mbtiles/osm.mbtiles");
baselayer = OpenStreetMap.CreateTileLayer();
//Create the database
baseLayer = new BioDivCollectorXamarin.Models.DatabaseModel.Layer();
baseLayer.title = "osm";
}
else if (basemap == "swissimage") //Swissimage case
{
baselayerDbsavepath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "mbtiles/swissimage.mbtiles");
baselayer = WMSLayer.CreateSwissimageWMTSTileLayer();
//Create the database
baseLayer = new BioDivCollectorXamarin.Models.DatabaseModel.Layer();
baseLayer.title = "swissimage";
}
Mbtiles.CreateMbTiles(baselayerDbsavepath, baseLayer, baselayer.TileSource);
//Populate the database
foreach (var zoomScale in baselayer.TileSource.Schema.Resolutions)
{
if (cancel)
{
break;
}
await Task.Run(async() =>
{
var baseLayerTileInfos = baselayer.TileSource.Schema.GetTileInfos(extent, zoomScale.Value.UnitsPerPixel);
foreach (var tileInfo in baseLayerTileInfos)
{
if (cancel)
{
break;
}
await Task.Run(() =>
{
tilesSaved++;
saveTile(baselayer.TileSource, tileInfo, baselayerDbsavepath, baseLayer);
});
}
});
}
Console.WriteLine("Baselayer saved");
});
tasks.Add(task);
await Task.WhenAll(tasks);
}
