將畫布保存到SVG

Question

簡單的問題給你所有（希望）。我在C＃中製作了一個畫布，這個畫布中有形狀。現在我想把這個畫布的形狀保存爲一個.svg文件來用於其他的事情。那麼，我怎樣才能把這個畫布保存到一個svg文件？

希望你能幫上忙。

Answer 1

你不能直接和Microsoft類做這個。你應該創建你自己的班級來做到這一點。

這只是一個例子，是不適合你使用，但有利於你的例子：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Xml; 
using System.Windows; 
using System.IO; 
using System.Windows.Media; 

namespace Render 
{ 
    public class SVGRenderer : IRenderContext 
    { 
     public bool Absolute { get { return true; } } 
     public double Width { get; private set; } 
     public double Height { get; private set; } 

     public MemoryStream SVGDocument { get; private set; } 
     private XmlTextWriter Writer { get { return m_writer; } } 

     private XmlTextWriter m_writer; 

     /// <summary> 
     /// Creates a new SVGRenderer, which will produce an output SVG with the specified width and height. 
     /// </summary> 
     /// <param name="width">Width of the output SVG.</param> 
     /// <param name="height">Height of the output SVG.</param> 
     public SVGRenderer(double width, double height) 
     { 
      SVGDocument = new MemoryStream(); 
      m_writer = new XmlTextWriter(SVGDocument, Encoding.UTF8); 
      m_writer.Formatting = Formatting.Indented; 
      this.Width = width; 
      this.Height = height; 
     } 

     public void Begin() 
     { 
      string cdlibraryVersion = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version.ToString(); 

      Writer.WriteStartDocument(); 
      Writer.WriteComment(" Generator: " + (IO.ApplicationInfo.FullName != null ? IO.ApplicationInfo.FullName : "") + ", cdlibrary.dll " + cdlibraryVersion + " "); 
      Writer.WriteDocType("svg", "-//W3C//DTD SVG 1.1//EN", "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd", null); 
      Writer.WriteStartElement("svg", "http://www.w3.org/2000/svg"); 
      Writer.WriteAttributeString("version", "1.1"); 
      Writer.WriteAttributeString("width", this.Width.ToString()); 
      Writer.WriteAttributeString("height", this.Height.ToString()); 
     } 

     public void End() 
     { 
      Writer.WriteEndDocument(); 
      Writer.Flush(); 
     } 

     public void StartSection(object tag) 
     { 
      // Do nothing. 
     } 

     public void DrawLine(Point start, Point end, double thickness) 
     { 
      m_writer.WriteStartElement("line"); 
      m_writer.WriteAttributeString("x1", start.X.ToString()); 
      m_writer.WriteAttributeString("y1", start.Y.ToString()); 
      m_writer.WriteAttributeString("x2", end.X.ToString()); 
      m_writer.WriteAttributeString("y2", end.Y.ToString()); 
      m_writer.WriteAttributeString("style", "stroke:rgb(0,0,0);stroke-linecap:square;stroke-width:" + thickness.ToString()); 
      m_writer.WriteEndElement(); 
     } 

     public void DrawRectangle(Point start, Size size, double thickness, bool fill = false) 
     { 
      m_writer.WriteStartElement("rect"); 
      m_writer.WriteAttributeString("x", start.X.ToString()); 
      m_writer.WriteAttributeString("y", start.Y.ToString()); 
      m_writer.WriteAttributeString("width", size.Width.ToString()); 
      m_writer.WriteAttributeString("height", size.Height.ToString()); 
      m_writer.WriteAttributeString("style", "fill-opacity:0;stroke:rgb(0,0,0);stroke-width:" + thickness.ToString()); 
      m_writer.WriteEndElement(); 
     } 

     public void DrawEllipse(Point centre, double radiusX, double radiusY, double thickness, bool fill = false) 
     { 
      string fillOpacity = ((fill ? 255f : 0f)/255f).ToString(); 

      m_writer.WriteStartElement("ellipse"); 
      m_writer.WriteAttributeString("cx", centre.X.ToString()); 
      m_writer.WriteAttributeString("cy", centre.Y.ToString()); 
      m_writer.WriteAttributeString("rx", radiusX.ToString()); 
      m_writer.WriteAttributeString("ry", radiusY.ToString()); 
      m_writer.WriteAttributeString("style", String.Format("fill-opacity:" + fillOpacity + ";fill:rgb({0},{1},{2});stroke:rgb(0,0,0);stroke-width:" + thickness.ToString(), 0, 0, 0)); 
      m_writer.WriteEndElement(); 
     } 

     public void DrawPath(Point start, IList<IPathCommand> commands, double thickness, bool fill = false) 
     { 
      string data = "M " + start.X.ToString() + "," + start.Y.ToString(); 
      Point last = new Point(0, 0); 
      foreach (IPathCommand pathCommand in commands) 
      { 
       data += " " + pathCommand.Shorthand(start, last); 
       last = new Point(pathCommand.End.X, pathCommand.End.Y); 
      } 

      string fillOpacity = ((fill ? 255f : 0f)/255f).ToString(); 

      m_writer.WriteStartElement("path"); 
      m_writer.WriteAttributeString("d", data); 
      m_writer.WriteAttributeString("style", "fill-opacity:" + fillOpacity + ";fill:rgb(0,0,0);stroke:rgb(0,0,0);stroke-width:" + thickness.ToString()); 
      m_writer.WriteEndElement(); 
     } 

     public void DrawText(Point anchor, TextAlignment alignment, IEnumerable<TextRun> textRuns, Brush bru = null) 
     { 
      m_writer.WriteStartElement("text"); 
      m_writer.WriteAttributeString("x", anchor.X.ToString()); 
      m_writer.WriteAttributeString("y", anchor.Y.ToString()); 

      string textAnchor = "start"; 
      if (alignment == TextAlignment.BottomCentre || alignment == TextAlignment.CentreCentre || alignment == Render.TextAlignment.TopCentre) 
       textAnchor = "middle"; 
      else if (alignment == TextAlignment.BottomRight || alignment == TextAlignment.CentreRight || alignment == Render.TextAlignment.TopRight) 
       textAnchor = "end"; 

      string dy = "-0.3em"; 
      if (alignment == TextAlignment.CentreCentre || alignment == TextAlignment.CentreLeft || alignment == TextAlignment.CentreRight) 
       dy = ".3em"; 
      else if (alignment == TextAlignment.TopCentre || alignment == TextAlignment.TopLeft || alignment == TextAlignment.TopRight) 
       dy = "1em"; 

      m_writer.WriteAttributeString("style", "font-family:Arial;font-size:" + textRuns.FirstOrDefault().Formatting.Size.ToString() + ";text-anchor:" + textAnchor); 
      m_writer.WriteAttributeString("dy", dy); 

      foreach (TextRun run in textRuns) 
      { 
       if (run.Formatting.FormattingType != TextRunFormattingType.Normal) 
        m_writer.WriteStartElement("tspan"); 
       if (run.Formatting.FormattingType == TextRunFormattingType.Subscript) 
       { 
        m_writer.WriteAttributeString("baseline-shift", "sub"); 
        m_writer.WriteAttributeString("style", "font-size:0.8em"); 
       } 
       else if (run.Formatting.FormattingType == TextRunFormattingType.Superscript) 
       { 
        m_writer.WriteAttributeString("baseline-shift", "super"); 
        m_writer.WriteAttributeString("style", "font-size:0.8em"); 
       } 
       m_writer.WriteString(run.Text); 
       if (run.Formatting.FormattingType != TextRunFormattingType.Normal) 
        m_writer.WriteEndElement(); 
      } 

      m_writer.WriteEndElement(); 
     } 
    } 
} 

希望幫助您