source: branches/HeuristicLab.Problems.GrammaticalOptimization/SharpVectorRenderingGdi/Gdi/GdiPatternFill.cs @ 13067

using System;
using System.IO;
using System.Xml;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;

using SharpVectors.Dom.Svg;
using SharpVectors.Dom.Css;

namespace SharpVectors.Renderers.Gdi
{
  public sealed class GdiPatternFill : GdiFill
    {
        #region Private Fields

        private XmlElement oldParent;
        private SvgPatternElement _patternElement;

        #endregion

        #region Constructors and Destructor

        public GdiPatternFill(SvgPatternElement patternElement)
    {
      _patternElement = patternElement;
        }

        #endregion

        #region Public Methods

        public override Brush GetBrush(RectangleF bounds)
        {
            Image image = GetImage(bounds);
            RectangleF destRect = GetDestRect(bounds);

            TextureBrush tb = new TextureBrush(image, destRect);
            tb.Transform = GetTransformMatrix(bounds);
            return tb;
        }

        #endregion

    #region Private Methods

    private SvgSvgElement MoveIntoSvgElement()
    {
            SvgDocument doc = _patternElement.OwnerDocument;
      SvgSvgElement svgElm = doc.CreateElement("", "svg", SvgDocument.SvgNamespace) as SvgSvgElement;

      XmlNodeList children = _patternElement.Children;
      if (children.Count > 0)
      {
        oldParent = children[0].ParentNode as XmlElement;
      }

      for (int i = 0; i<children.Count; i++)
      {
        svgElm.AppendChild(children[i]);
      }

      if (_patternElement.HasAttribute("viewBox"))
      {
        svgElm.SetAttribute("viewBox", _patternElement.GetAttribute("viewBox"));
      }
      svgElm.SetAttribute("x", "0");
      svgElm.SetAttribute("y", "0");
      svgElm.SetAttribute("width", _patternElement.GetAttribute("width"));
      svgElm.SetAttribute("height", _patternElement.GetAttribute("height"));

      if (_patternElement.PatternContentUnits.AnimVal.Equals(SvgUnitType.ObjectBoundingBox))
      {
        svgElm.SetAttribute("viewBox", "0 0 1 1");
      }

      _patternElement.AppendChild(svgElm);

            return svgElm;
    }

    private void MoveOutOfSvgElement(SvgSvgElement svgElm)
    {
      while (svgElm.ChildNodes.Count > 0)
      {
        oldParent.AppendChild(svgElm.ChildNodes[0]);
      }

      _patternElement.RemoveChild(svgElm);
    }

    private Image GetImage(RectangleF bounds)
    {
            GdiGraphicsRenderer renderer = new GdiGraphicsRenderer();
      renderer.Window = _patternElement.OwnerDocument.Window as SvgWindow;

      SvgSvgElement elm = MoveIntoSvgElement();

      renderer.Render(elm as SvgElement);
            Image img = renderer.RasterImage;

      MoveOutOfSvgElement(elm);

      return img;
    }


    private float CalcPatternUnit(SvgLength length, SvgLengthDirection dir, RectangleF bounds)
    {
      if (_patternElement.PatternUnits.AnimVal.Equals(SvgUnitType.UserSpaceOnUse))
      {
                return (float)length.Value;
      }
      else
      {
                float calcValue = (float)length.ValueInSpecifiedUnits;
        if (dir == SvgLengthDirection.Horizontal)
        {
          calcValue *= bounds.Width;
        }
        else
        {
          calcValue *= bounds.Height;
        }
        if (length.UnitType == SvgLengthType.Percentage)
        {
          calcValue /= 100F;
        }

        return calcValue;
      }
    }

    private RectangleF GetDestRect(RectangleF bounds)
    {
      RectangleF result = new RectangleF(0, 0, 0, 0);
      result.Width  = CalcPatternUnit(_patternElement.Width.AnimVal as SvgLength, 
                SvgLengthDirection.Horizontal, bounds);
      result.Height = CalcPatternUnit(_patternElement.Height.AnimVal as SvgLength, 
                SvgLengthDirection.Vertical, bounds);
      
      return result;
    }

    private Matrix GetTransformMatrix(RectangleF bounds)
    {
      SvgMatrix svgMatrix = ((SvgTransformList)_patternElement.PatternTransform.AnimVal).TotalMatrix;

            Matrix transformMatrix = new Matrix((float)svgMatrix.A, (float)svgMatrix.B, (float)svgMatrix.C,
                (float)svgMatrix.D, (float)svgMatrix.E, (float)svgMatrix.F);

      float translateX = CalcPatternUnit(_patternElement.X.AnimVal as SvgLength, 
                SvgLengthDirection.Horizontal, bounds);
      float translateY = CalcPatternUnit(_patternElement.Y.AnimVal as SvgLength, 
                SvgLengthDirection.Vertical, bounds);

      transformMatrix.Translate(translateX, translateY, MatrixOrder.Prepend);

      return transformMatrix;
    }

    #endregion
  }
}