stgsharp/StgSharp.Model/STEP/Items/StepBSplineCurveWithKnots.cs

//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
//     file="StepBSplineCurveWithKnots.cs"
//     Project: StgSharp
//     AuthorGroup: Nitload Space
//     Copyright (c) Nitload Space. All rights reserved.
//     
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//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
using StgSharp.Script;
using StgSharp.Script.Express;

using System;

using System.Collections.Generic;
using System.Linq;

namespace StgSharp.Modeling.Items
{
    public enum StepKnotType
    {

        UniformKnots,
        QuasiUniformKnots,
        PiecewiseBezierKnots,
        Unspecified

    }

;

    public class StepBSplineCurveWithKnots : StepBSplineCurve
    {

        private const string PIECEWISE_BEZIER_KNOTS = "PIECEWISE_BEZIER_KNOTS";
        private const string QUASI_UNIFORM_KNOTS = "QUASI_UNIFORM_KNOTS";

        private const string UNIFORM_KNOTS = "UNIFORM_KNOTS";
        private const string UNSPECIFIED = "UNSPECIFIED";

        public StepBSplineCurveWithKnots(
               string name,
               IEnumerable<StepCartesianPoint> controlPoints )
            : base( name, controlPoints ) { }

        public StepBSplineCurveWithKnots( string name, params StepCartesianPoint[] controlPoints )
            : base( name, controlPoints ) { }

        public List<int> KnotMultiplicities { get; } = new List<int>();

        public List<double> Knots { get; } = new List<double>();

        public override StepItemType ItemType => StepItemType.BSplineCurveWithKnots;

        public StepKnotType KnotSpec { get; set; } = StepKnotType.Unspecified;

        internal static StepBSplineCurveWithKnots CreateFromSyntaxList(
                                                  StepBinder binder,
                                                  ExpNode syntaxList )
        {
            ExpNodeNextEnumerator enumerator = new ExpNodeNextEnumerator( syntaxList );
            enumerator.AssertEnumeratorCount( 9 );
            object controlPointsList = enumerator.Values[ 2 ].GetValueList();

            StepBSplineCurveWithKnots spline = new StepBSplineCurveWithKnots(
                string.Empty, new StepCartesianPoint[controlPointsList.Values.Count] );
            spline.Name = enumerator.Values[ 0 ].CodeConvertTemplate;
            spline.Degree = ( enumerator.Values[ 1 ] as ExpIntNode )!.Value;

            for( int i = 0; i < controlPointsList.Values.Count; i++ )
            {
                int j = i; // capture to avoid rebinding
                binder.BindValue(
                    controlPointsList.Values[ j ],
                    v => spline.ControlPointsList[ j ] = v.AsType<StepCartesianPoint>() );
            }

            spline.CurveForm = ParseCurveForm( enumerator.Values[ 3 ].GetEnumerationValue() );
            spline.ClosedCurve = ( enumerator.Values[ 4 ] as ExpBoolNode )!.Value;
            spline.SelfIntersect = ( enumerator.Values[ 5 ]as ExpBoolNode )!.Value;

            object knotMultiplicitiesList = enumerator.Values[ 6 ].GetValueList();
            spline.KnotMultiplicities.Clear();
            for( int i = 0; i < knotMultiplicitiesList.Values.Count; i++ ) {
                spline.KnotMultiplicities
                      .Add( knotMultiplicitiesList.Values[ i ].GetIntegerValue() );
            }

            object knotslist = enumerator.Values[ 7 ].GetValueList();
            spline.Knots.Clear();
            for( int i = 0; i < knotslist.Values.Count; i++ ) {
                spline.Knots.Add( knotslist.Values[ i ].GetRealVavlue() );
            }

            spline.KnotSpec = ParseKnotSpec( enumerator.Values[ 8 ].GetEnumerationValue() );

            return spline;
        }

        private static string GetKnotSpec( StepKnotType spec )
        {
            switch( spec )
            {
                case StepKnotType.UniformKnots:
                    return UNIFORM_KNOTS;
                case StepKnotType.QuasiUniformKnots:
                    return QUASI_UNIFORM_KNOTS;
                case StepKnotType.PiecewiseBezierKnots:
                    return PIECEWISE_BEZIER_KNOTS;
                case StepKnotType.Unspecified:
                    return UNSPECIFIED;
            }

            throw new NotImplementedException();
        }

        private static StepKnotType ParseKnotSpec( string enumerationValue )
        {
            switch( enumerationValue.ToUpperInvariant() )
            {
                case UNIFORM_KNOTS:
                    return StepKnotType.UniformKnots;
                case QUASI_UNIFORM_KNOTS:
                    return StepKnotType.QuasiUniformKnots;
                case PIECEWISE_BEZIER_KNOTS:
                    return StepKnotType.PiecewiseBezierKnots;
                default:
                    return StepKnotType.Unspecified;
            }
        }

    }
}