source: tags/3.3.7/HeuristicLab.ExtLibs/HeuristicLab.Netron/3.0.2672.12446/Netron.Diagramming.Core-3.0.2672.12446/IO/SVG/SVGSerializer.cs

using System;
using System.Diagnostics;
using System.Xml;
using Netron.GraphLib.UI;
namespace Netron.GraphLib.IO.SVG
{
  /// <summary>
  /// Exports a diagram to SVG
  /// </summary>
  public class SVGSerializer
  {
    #region Fields
    private GraphControl site;
    #endregion

    #region Constructor
    /// <summary>
    /// Defautl constructor
    /// </summary>
    /// <param name="site"></param>
    public SVGSerializer(GraphControl site)
    {
      this.site = site;
    }

    #endregion

    #region Methods
    /// <summary>
    /// Serializes the given graph abstract to XML with the given XmlWriter
    /// </summary>
    /// <param name="writer"></param>
    /// <param name="g"></param>
    public static void Serialize(XmlWriter writer, GraphAbstract g  )
    {
      writer.WriteStartElement("svg");
      writer.WriteAttributeString("xmlns","http://www.w3.org/2000/svg");
      WriteDefinitions(writer);
      WriteFilters(writer);
      WriteMetadata(writer, g);
      
      WriteConnections(writer, g);
      WriteShapes(writer, g);

      writer.WriteEndElement();
    }

    private static void WriteShapes(XmlWriter writer, GraphAbstract g)
    {
      writer.WriteStartElement("g");
      for(int k=0; k<g.Shapes.Count; k++) //<rect x="1140" y="30" width="100" height="20" style="fill: url(#two_hues); stroke: black;"/>
      {
        writer.WriteStartElement("rect");
        writer.WriteAttributeString("x", g.Shapes[k].X.ToString());
        writer.WriteAttributeString("y", g.Shapes[k].Y.ToString());
        writer.WriteAttributeString("width", g.Shapes[k].Width.ToString());
        writer.WriteAttributeString("height", g.Shapes[k].Height.ToString());
        writer.WriteAttributeString("rx", "2");//rounded rectangle        

        //writer.WriteAttributeString("style", "fill: url(#two_hues); stroke: black;");
        writer.WriteAttributeString("fill",  string.Concat("#", (g.Shapes[k].ShapeColor.ToArgb() & 0x00FFFFFF).ToString("X6")) );
        writer.WriteEndElement();
        
        //<text text-anchor="middle" x="{$x+50}" y="{$y+15}">
        writer.WriteStartElement("text");
        writer.WriteAttributeString("x", Convert.ToString(g.Shapes[k].X + 10));
        writer.WriteAttributeString("y", Convert.ToString(g.Shapes[k].Y + 15));
        writer.WriteAttributeString("text-anchor", "start");      
        writer.WriteAttributeString("font-size", "9");
        writer.WriteString(g.Shapes[k].Text);
        writer.WriteEndElement();
        
      }
      writer.WriteEndElement();
    }

    private static void WriteConnections(XmlWriter writer, GraphAbstract g)
    {
      /*
        <line class="edge" x1="{$x1}" y1="{$y1}" x2="{$x}" y2="{$y+50}">
        <xsl:attribute name="style">marker-end:url(#arrow)</xsl:attribute>
        </line>
       */
      writer.WriteStartElement("g");
      for(int k=0; k<g.Connections.Count; k++) 
      {
        writer.WriteStartElement("line");
        writer.WriteAttributeString("x1", g.Connections[k].From.Location.X.ToString());
        writer.WriteAttributeString("y1", g.Connections[k].From.Location.Y.ToString());
        writer.WriteAttributeString("x2", g.Connections[k].To.Location.X.ToString());
        writer.WriteAttributeString("y2", g.Connections[k].To.Location.Y.ToString());       
        //writer.WriteAttributeString("style", "fill: url(#two_hues); stroke: black;");       
        writer.WriteEndElement();
      }
      writer.WriteEndElement();
    }

    private static void WriteMetadata(XmlWriter writer, GraphAbstract g)
    {
      writer.WriteStartElement("title");
      writer.WriteString(g.GraphInformation.Title);
      writer.WriteEndElement();
      writer.WriteStartElement("desc");
      writer.WriteString(g.GraphInformation.Description);
      writer.WriteEndElement();
    }

    private static void WriteDefinitions(XmlWriter writer)
    {
      writer.WriteRaw(@"<defs>
                    <linearGradient id=""two_hues"">
                        <stop offset=""0%"" style=""stop-color: #ffffff;""/>
                        <stop offset=""100%"" style=""stop-color: #4682B4;""/>
                    </linearGradient>
                    </defs>"
        );
//      writer.WriteStartElement("defs");
//      writer.WriteStartElement("linearGradient");
//      writer.WriteAttributeString("id", "two_hues");
//      writer.WriteStartElement("stop");
//      writer.WriteAttributeString("offset", "0%");
//      writer.WriteAttributeString("style","stop-color: #ffffff");
//      writer.WriteEndElement();//stop
//      writer.WriteStartElement("stop");
//      writer.WriteAttributeString("offset", "100%");
//      writer.WriteAttributeString("style","stop-color: #4682B4");
//      writer.WriteEndElement();//stop
//      writer.WriteEndElement();//linearGradient
//      writer.WriteEndElement();//defs


    }

    private static void WriteFilters(XmlWriter writer)
    {

      writer.WriteRaw(@"<filter id=""drop-shadow"">
                      <feGaussianBlur in=""SourceAlpha"" stdDeviation=""2"" result=""blur""/>
                      <feOffset in=""blur"" dx=""4"" dy=""4"" result=""offsetBlur""/>
                      <feMerge>
                        <feMergeNode in=""offsetBlur""/>
                        <feMergeNode in=""SourceGraphic""/>
                      </feMerge>
                    </filter>"
                  );

//      writer.WriteStartElement("filter");
//      writer.WriteAttributeString("id","dropShadow");
//      writer.WriteStartElement("feGaussianBlur");
//      writer.WriteAttributeString("in", "SourceAlpha");
//      writer.WriteAttributeString("stdDeviation","2");
//      writer.WriteAttributeString("result","blur");
//      writer.WriteEndElement();//feGaussianBlur
//      writer.WriteEndElement();//filter


    }
    /// <summary>
    /// Saves the diagram to SVG format
    /// </summary>
    /// <param name="fileName">the file-path</param>
    /// <param name="site">the graph-control instance to be serialized</param>
    /// <returns></returns>
    public static  bool SaveAs(string fileName, GraphControl site)
    {
      XmlTextWriter tw = null;
      try
      {

        tw = new XmlTextWriter(fileName,System.Text.Encoding.Unicode);
        tw.Formatting = System.Xml.Formatting.Indented;       
        Serialize(tw,site.Abstract);
        
        return true;
      }
      catch(Exception exc)      
      {       
        //TODO: more specific exception handling here
        Trace.WriteLine(exc.Message, "SVGSerializer.SaveAs");
      }
      catch
      {
        Trace.WriteLine("Non-CLS exception caught.","BinarySerializer.SaveAs");
      }
      finally
      {
        if(tw!=null) tw.Close();
      }
      return false;

    }
    #endregion
  }
}