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namespace WinFormSamples

{

using System;

using System.Drawing;

using System.Drawing.Imaging;

using System.IO;

using BruTile;

using BruTile.Cache;

using GeoAPI.Geometries;

using SharpMap;

using SharpMap.Layers;

internal class SharpMapTileSource : ITileSource

{

private readonly SharpMapTileProvider provider;

public SharpMapTileSource(ITileSchema schema, params ILayer[] layers) : this(schema, null, layers) { }

public SharpMapTileSource(ITileSchema schema, ITileCache<byte[]> cache, params ILayer[] layers)

{

Title = "SharpMap.Map";

if (schema == null)

throw new ArgumentNullException("schema");

if (layers == null)

throw new ArgumentNullException("layers");

this.provider = new SharpMapTileProvider(schema, cache, layers);

}

public string Title { get; set; }

public ITileProvider Provider

{

get { return this.provider; }

}

public ITileSchema Schema

{

get { return this.provider.Schema; }

}

public string Name { get; private set; }

public Extent Extent

{

get { throw new NotImplementedException(); }

}

public Attribution Attribution => throw new NotImplementedException();

public byte[] GetTile(TileInfo tileInfo)

{

return provider.GetTile(tileInfo);

}

}

internal class SharpMapTileProvider : ITileProvider

{

private class NullCache : ITileCache<byte[]>

{

public void Add(TileIndex index, byte[] image) { }

public void Remove(TileIndex index) { throw new NotImplementedException(); }

public byte[] Find(TileIndex index) { return null; }

}

private readonly ITileCache<byte[]> cache;

public ITileSchema Schema { get; private set; }

private readonly LayerCollection layers;

private ImageFormat format;

public SharpMapTileProvider(ITileSchema schema, ITileCache<byte[]> cache, params ILayer[] layers)

{

if (schema == null)

throw new ArgumentNullException("schema");

if (layers == null)

throw new ArgumentNullException("layers");

this.Schema = schema;

this.cache = cache ?? new NullCache();

LayerCollection collection = new LayerCollection();

foreach (ILayer layer in layers)

collection.Add(layer);

this.layers = collection;

}

public byte[] GetTile(TileInfo info)

{

if (info == null)

throw new ArgumentNullException("info");

if (this.format == null)

this.format = GetFormat(this.Schema);

TileIndex index = info.Index;

byte[] bytes = this.cache.Find(index);

if (bytes != null)

return bytes;

using (Image tile = this.CreateTile(info))

using (MemoryStream ms = new MemoryStream())

{

tile.Save(ms, this.format);

bytes = ms.ToArray();

this.cache.Add(index, bytes);

return ms.ToArray();

}

}

private static ImageFormat GetFormat(ITileSchema schema)

{

string format = schema.Format;

if (String.Equals("JPEG", format, StringComparison.InvariantCultureIgnoreCase))

return ImageFormat.Jpeg;

if (String.Equals("JPG", format, StringComparison.InvariantCultureIgnoreCase))

return ImageFormat.Jpeg;

if (String.Equals("GIF", format, StringComparison.InvariantCultureIgnoreCase))

return ImageFormat.Gif;

if (String.Equals("BMP", format, StringComparison.InvariantCultureIgnoreCase))

return ImageFormat.Bmp;

if (String.Equals("TIFF", format, StringComparison.InvariantCultureIgnoreCase))

return ImageFormat.Tiff;

if (String.Equals("TIF", format, StringComparison.InvariantCultureIgnoreCase))

return ImageFormat.Tiff;

return ImageFormat.Png;

}

private readonly object synclock = new object();

private Image CreateTile(TileInfo info)

{

lock (synclock)

{

var tileWidth = this.Schema.GetTileWidth(info.Index.Level);

var tileHeight = this.Schema.GetTileHeight(info.Index.Level);

Size size = new Size(tileWidth, tileHeight);

Map map = new Map(size) { BackColor = Color.Transparent };

map.Layers.AddCollection(this.layers);

Extent ext = info.Extent;

Envelope bbox = new Envelope(ext.MinX, ext.MaxX, ext.MinY, ext.MaxY);

map.ZoomToBox(bbox);

return map.GetMap();

}

}

}

}