source: branches/HeuristicLab.Problems.GrammaticalOptimization/SharpVectorCss/Css/CssPrimitiveAngleValue.cs @ 13825

using System;
using System.Text.RegularExpressions;

namespace SharpVectors.Dom.Css
{
    public sealed class CssPrimitiveAngleValue : CssPrimitiveValue
  {
    #region Constructors
    public CssPrimitiveAngleValue(string number, string unit, bool readOnly) : base(number+unit, readOnly)
    {
      _setType(unit);
      SetFloatValue(number);
    }

    public CssPrimitiveAngleValue(string cssText, bool readOnly) : base(cssText, readOnly)
    {
      OnSetCssText(cssText);
    }

    public CssPrimitiveAngleValue(double number, string unit, bool readOnly) : base(number+unit, readOnly)
    {
      _setType(unit);
      SetFloatValue(number);
    }
    #endregion

    protected override void OnSetCssText(string cssText)
    {
      Regex re = new Regex(CssValue.AnglePattern);
      Match match = re.Match(cssText);
      if(match.Success)
      {
        _setType(match.Groups["angleUnit"].Value);
        SetFloatValue(match.Groups["angleNumber"].Value);
      }
      else
      {
        throw new DomException(DomExceptionType.SyntaxErr, "Unrecognized angle format: " + cssText);
      }
    }
    private void _setType(string unit)
    {
      switch(unit)
      {
        case "":
          SetPrimitiveType(CssPrimitiveType.Number);
          break;
        case "deg":
          SetPrimitiveType(CssPrimitiveType.Deg);
          break;
        case "rad":
          SetPrimitiveType(CssPrimitiveType.Rad);
          break;
        case "grad":
          SetPrimitiveType(CssPrimitiveType.Grad);
          break;
        default:
          throw new DomException(DomExceptionType.SyntaxErr, "Unknown angle unit");
      }
    }

    // only for absolute values
    private double _getDegAngle()
    {
      double ret;
      switch(PrimitiveType)
      {
        case CssPrimitiveType.Rad:
          ret = floatValue * 180 / Math.PI;
          break;
        case CssPrimitiveType.Grad:
          ret = floatValue *90 / 100;
          break;
        default:
          ret = floatValue;
          break;
      }
      ret %= 360;
      while(ret<0) ret += 360;

      return ret;
    }

    public override double GetFloatValue(CssPrimitiveType unitType)
    {
      double ret = Double.NaN;
      switch(unitType)
      {
        case CssPrimitiveType.Number:
        case CssPrimitiveType.Deg:
          ret = _getDegAngle();
          break;
        case CssPrimitiveType.Rad:
          ret = _getDegAngle() * Math.PI / 180;
          break;
        case CssPrimitiveType.Grad:
          ret = _getDegAngle() * 100 / 90;
          break;
      }
      if(Double.IsNaN(ret))
      {
        throw new DomException(DomExceptionType.InvalidAccessErr);
      }
      else
      {
        return ret;
      }
    }

    public override string CssText
    {
      get
      {
        return GetFloatValue(PrimitiveType).ToString(CssNumber.Format) + PrimitiveTypeAsString;
      }
    }
  }
}