public byte[] ToBitmap(LayerInfo layerInfo)
{
using (var bitmap = new Bitmap(256, 256))
using (var canvas = Graphics.FromImage(bitmap))
using (var pen = new Pen(Color.Red, 2))
{
foreach (var feature in layerInfo.FeatureCollection.Features)
{
if (feature.Geometry.Type == GeoJSONObjectType.Polygon)
{
var polygon = (Polygon)feature.Geometry;
foreach (var lineString in polygon.Coordinates)
{
canvas.Transform = new Matrix(); // todo set te matrix transform to match the tile extent.
canvas.DrawPolygon(pen, ToGdi(lineString));
}
}
}
return ToBytes(bitmap);
}
}
public static List<LayerInfo> Parse(Stream stream, int x, int y, int z,bool convertToGeographicPosition=true)
{
var tile = Serializer.Deserialize<Tile>(stream);
var list = new List<LayerInfo>();
foreach (var layer in tile.Layers)
{
var extent = layer.Extent;
var li = new LayerInfo();
var fc = new FeatureCollection();
foreach (var feature in layer.Features)
{
var f = FeatureParser.Parse(feature, layer.Keys, layer.Values, x, y, z, extent, convertToGeographicPosition);
if (f != null)
{
fc.Features.Add(f);
}
}
li.FeatureCollection = fc;
li.Name = layer.Name;
list.Add(li);
}
return list;
}