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Version 4.15.1: Simplified MBTiles.

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ClemensF 2019-11-17 00:10:08 +01:00
parent 08e1823e06
commit d0e671585b
3 changed files with 46 additions and 32 deletions
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43
MBTiles/Shared/MBTileData.cs
View file

@ -15,11 +15,28 @@ namespace MapControl.MBTiles
{ {
private readonly SQLiteConnection connection; private readonly SQLiteConnection connection;
public IDictionary<string, string> Metadata { get; } = new Dictionary<string, string>();
private MBTileData(string file) private MBTileData(string file)
{ {
connection = new SQLiteConnection("Data Source=" + Path.GetFullPath(file)); connection = new SQLiteConnection("Data Source=" + Path.GetFullPath(file));
} }
public void Dispose()
{
connection.Dispose();
}
public static async Task<MBTileData> CreateAsync(string file)
{
var tileData = new MBTileData(file);
await tileData.OpenAsync();
await tileData.ReadMetadataAsync();
return tileData;
}
private async Task OpenAsync() private async Task OpenAsync()
{ {
await connection.OpenAsync(); await connection.OpenAsync();
@ -35,24 +52,8 @@ namespace MapControl.MBTiles
} }
} }
public static async Task<MBTileData> CreateAsync(string file) private async Task ReadMetadataAsync()
{ {
var tileData = new MBTileData(file);
await tileData.OpenAsync();
return tileData;
}
public void Dispose()
{
connection.Dispose();
}
public async Task<IDictionary<string, string>> ReadMetadataAsync()
{
var metadata = new Dictionary<string, string>();
try try
{ {
using (var command = new SQLiteCommand("select * from metadata", connection)) using (var command = new SQLiteCommand("select * from metadata", connection))
@ -61,7 +62,7 @@ namespace MapControl.MBTiles
while (await reader.ReadAsync()) while (await reader.ReadAsync())
{ {
metadata[(string)reader["name"]] = (string)reader["value"]; Metadata[(string)reader["name"]] = (string)reader["value"];
} }
} }
} }
@ -69,17 +70,15 @@ namespace MapControl.MBTiles
{ {
Debug.WriteLine("MBTileData: " + ex.Message); Debug.WriteLine("MBTileData: " + ex.Message);
} }
return metadata;
} }
public async Task WriteMetadataAsync(IDictionary<string, string> metaData) public async Task WriteMetadataAsync()
{ {
try try
{ {
using (var command = new SQLiteCommand("insert or replace into metadata (name, value) values (@n, @v)", connection)) using (var command = new SQLiteCommand("insert or replace into metadata (name, value) values (@n, @v)", connection))
{ {
foreach (var keyValue in metaData) foreach (var keyValue in Metadata)
{ {
command.Parameters.AddWithValue("@n", keyValue.Key); command.Parameters.AddWithValue("@n", keyValue.Key);
command.Parameters.AddWithValue("@v", keyValue.Value); command.Parameters.AddWithValue("@v", keyValue.Value);

23
MBTiles/Shared/MBTileLayer.cs
View file

@ -36,6 +36,14 @@ namespace MapControl.MBTiles
set { SetValue(FileProperty, value); } set { SetValue(FileProperty, value); }
} }
/// <summary>
/// May be overridden to create a derived MBTileSource that handles other tile formats than png and jpg, e.g. pbf.
/// </summary>
protected virtual MBTileSource CreateTileSource(MBTileData tileData)
{
return new MBTileSource(tileData);
}
private async Task FilePropertyChanged(string file) private async Task FilePropertyChanged(string file)
{ {
(TileSource as MBTileSource)?.Dispose(); (TileSource as MBTileSource)?.Dispose();
@ -48,33 +56,32 @@ namespace MapControl.MBTiles
if (file != null) if (file != null)
{ {
var tiledata = await MBTileData.CreateAsync(file); var tileData = await MBTileData.CreateAsync(file);
var metadata = await tiledata.ReadMetadataAsync();
string s;
int minZoom; int minZoom;
int maxZoom; int maxZoom;
string s;
if (metadata.TryGetValue("name", out s)) if (tileData.Metadata.TryGetValue("name", out s))
{ {
SourceName = s; SourceName = s;
} }
if (metadata.TryGetValue("description", out s)) if (tileData.Metadata.TryGetValue("description", out s))
{ {
Description = s; Description = s;
} }
if (metadata.TryGetValue("minzoom", out s) && int.TryParse(s, out minZoom)) if (tileData.Metadata.TryGetValue("minzoom", out s) && int.TryParse(s, out minZoom))
{ {
MinZoomLevel = minZoom; MinZoomLevel = minZoom;
} }
if (metadata.TryGetValue("maxzoom", out s) && int.TryParse(s, out maxZoom)) if (tileData.Metadata.TryGetValue("maxzoom", out s) && int.TryParse(s, out maxZoom))
{ {
MaxZoomLevel = maxZoom; MaxZoomLevel = maxZoom;
} }
TileSource = new MBTileSource(tiledata); TileSource = CreateTileSource(tileData);
} }
} }
} }

10
MBTiles/Shared/MBTileSource.cs
View file

@ -12,7 +12,7 @@ using System.Windows.Media;
namespace MapControl.MBTiles namespace MapControl.MBTiles
{ {
public sealed class MBTileSource : TileSource, IDisposable public class MBTileSource : TileSource, IDisposable
{ {
public MBTileData TileData { get; } public MBTileData TileData { get; }
@ -22,9 +22,17 @@ namespace MapControl.MBTiles
} }
public void Dispose() public void Dispose()
{
Dispose(true);
}
protected virtual void Dispose(bool disposing)
{
if (disposing)
{ {
TileData.Dispose(); TileData.Dispose();
} }
}
public override async Task<ImageSource> LoadImageAsync(int x, int y, int zoomLevel) public override async Task<ImageSource> LoadImageAsync(int x, int y, int zoomLevel)
{ {