PTV Group - Logistics Forum

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public Stream GetImageStream(int x, int y, int zoom)
        {
            try
            {
                // the map contains only one layer
                var districts = new VectorLayer("Districts")
                {
                    // set the sharpmap provider for shape files as data source
                    DataSource = <Sharp map Data source>,

                    // use a dynamic style for thematic mapping
                    // the lambda also takes the map instance into account (to scale the border width)
                    Theme = new SharpMap.Rendering.Thematics.CustomTheme(GetCountryStyle)
                };

                // create a transparent sharpmap map with a size of 256x256
                using (var sharpMap = new SharpMap.Map(new Size(256, 256)) { BackColor = Color.Transparent })
                {
                    // add the layer to the map
                    sharpMap.Layers.Add(districts);

                    // calculate the bbox for the tile key and zoom the map 
                    sharpMap.ZoomToBox(TileToMercatorAtZoom(x, y, zoom));

                    // render the map image
                    using (var image = sharpMap.GetMap())
                    {
                        // stream the image to the client
                        var memoryStream = new MemoryStream();

                        image.Save(memoryStream, ImageFormat.Png);
                        memoryStream.Seek(0, SeekOrigin.Begin);

                        return memoryStream;
                    }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        } 

	private SharpMap.Styles.VectorStyle GetCountryStyle(SharpMap.Data.FeatureDataRow featureDataRow)
        {
            // set a linear gradient brush for each country according to the bounding pixel rectangle
            SharpMap.Styles.VectorStyle style = new SharpMap.Styles.VectorStyle();

            // color code for active region
            Color color = System.Drawing.ColorTranslator.FromHtml("#009EE3");
            style.Fill = new SolidBrush(color);

            // set the border width depending on the map scale
            Pen pen = new Pen(Brushes.Black);
            pen.LineJoin = LineJoin.Round;
            style.Outline = pen;

	          // this flag is used to set the border to each zip code shape
            style.EnableOutline = true;
            return style;
        } // GetCountryStyle

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GeoAPI.Geometries.IGeometry geometryCollection = geometryFactory.CreateGeometryCollection(geometryList.ToArray());
GeoAPI.Geometries.IGeometry geometryUnion = geometryCollection.Buffer(0.0);

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NetTopologySuite.Operation.Union.CascadedPolygonUnion geometryUnion1 = new NetTopologySuite.Operation.Union.CascadedPolygonUnion(geometryList.ToArray());

GeoAPI.Geometries.IGeometry geometryCollection = geometryFactory.CreateGeometryCollection(geometryList.ToArray());                
GeoAPI.Geometries.IGeometry geometryUnion = geometryUnion1.Union();