SvgPathSegCurvetoQuadraticAbs.cs :  » GUI » SharpVectorGraphics » SharpVectors » Dom » Svg » C# / CSharp Open Source

using System;
using System.Drawing;
using System.Text;

#if TEST
using NUnit.Framework;
#endif

namespace SharpVectors.Dom.Svg{
  /// <summary>
  /// Summary description for SvgPathSegCurvetoCubicAbs.
  /// </summary>
  public class SvgPathSegCurvetoQuadraticAbs : SvgPathSegCurvetoQuadratic, ISvgPathSegCurvetoQuadraticAbs
  {
        #region constructors
    internal SvgPathSegCurvetoQuadraticAbs(float x, float y, float x1, float y1) : base(SvgPathSegType.CurveToQuadraticAbs)
    {
      this.x = x;
      this.y = y;
      this.x1 = x1;
      this.y1 = y1;
    }
        #endregion

        #region implementation of ISvgPathSegCurvetoQuadraticAbs
    private float x;
    public float X
    {
      get{return x;}
      set{x = value;}
    }      

    private float y;    
    public float Y
    {
      get{return y;}
      set{y = value;}
    }      

    private float x1;
    public float X1    
    {
      get{return x1;}
      set{x1 = value;}
    }      

    private float y1;    
    public float Y1
    {
      get{return y1;}
      set{y1 = value;}
    }
        #endregion
    
        #region public methods
    public override PointF AbsXY
    {
      get
      {
        return new PointF(X, Y);
      }
    }

    public override PointF QuadraticX1Y1
    {
      get
      {
        return new PointF(X1, Y1);
      }
    }

    /*
    * Convert to cubic bezier using the algorithm from Math:Bezier:Convert in CPAN
    * $p0x+($p1x-$p0x)*2/3
    * $p0y+($p1y-$p0y)*2/3
    * $p1x+($p2x-$p1x)/3
    * $p1x+($p2x-$p1x)/3
    * */

    public override PointF CubicX1Y1
    {
      get
      {
        PointF prevPoint = PreviousSeg.AbsXY;

        float x1 = prevPoint.X + (X1 - prevPoint.X) * 2/3;
        float y1 = prevPoint.Y + (Y1 - prevPoint.Y) * 2/3;
      
        return new PointF(x1, y1);
      }
    }

    public override PointF CubicX2Y2
    {
      get
      {
        float x2 = X1 + (X - X1) / 3;
        float y2 = Y1 + (Y - Y1) / 3;

        return new PointF(x2, y2);
      }
    }

    public override string PathText
    {
      get
      {
        StringBuilder sb = new StringBuilder();
        sb.Append(PathSegTypeAsLetter);
        sb.Append(X1);
        sb.Append(",");
        sb.Append(Y1);
        sb.Append(",");
        sb.Append(X);
        sb.Append(",");
        sb.Append(Y);

        return sb.ToString();
      }
    }
        #endregion

        #region unit tests
        #if TEST
        [TestFixture]
        public class QuadraticAbsTests : QuadraticTests
        {
            public override SvgPathSegList makeSegments()
            {
                return new SvgPathSegList("M10,10 Q100,100 200,10", false);
            }

            public override SvgPathSegCurvetoQuadratic getTestSegment()
            {
                return (SvgPathSegCurvetoQuadratic) segments[1];
            }
        }
        #endif
        #endregion
  }
}