source: branches/HeuristicLab.Problems.GrammaticalOptimization/SharpVectorModel/Paths/SvgPathSegCurveto.cs @ 13857

using System;

using SharpVectors.Polynomials;

namespace SharpVectors.Dom.Svg
{
  public abstract class SvgPathSegCurveto : SvgPathSeg
  {
        #region constructors
    protected SvgPathSegCurveto(SvgPathSegType type) : base(type)
    {
    }
        #endregion

        #region abstract properties

        public abstract override SvgPointF AbsXY { get; }
        public abstract SvgPointF CubicX1Y1 { get; }
        public abstract SvgPointF CubicX2Y2 { get; }
        
        #endregion

        #region public properties
        public override double Length
        {
            get
            {
                return this.getArcLengthPolynomial().Simpson(0, 1);
            }
        }

        public override double StartAngle
    {
      get
      {
                SvgPointF p1 = PreviousSeg.AbsXY;
                SvgPointF p2 = CubicX1Y1;

                double dx = p2.X - p1.X;
                double dy = p2.Y - p1.Y;
                double a = (Math.Atan2(dy, dx) * 180 / Math.PI);
        a += 270;
        a %= 360;
        return a;
      }
    }

        public override double EndAngle
    {
      get
      {
                SvgPointF p1 = CubicX2Y2;
                SvgPointF p2 = AbsXY;

                double dx = p1.X - p2.X;
                double dy = p1.Y - p2.Y;
                double a = (Math.Atan2(dy, dx) * 180 / Math.PI);
        a += 270;
        a %= 360;
        return a;
      }
    }
        #endregion
      
        protected abstract SqrtPolynomial getArcLengthPolynomial();
  }
}