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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//     
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//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
using StgSharp.Model.Step;
using StgSharp.Script;
using StgSharp.Script.Express;

using System;

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

namespace StgSharp.Model.Step
{
    public enum StepKnotType
    {

        UniformKnots,
        QuasiUniformKnots,
        PiecewiseBezierKnots,
        Unspecified

    }

;

    public class StepBSplineCurveWithKnots : StepBSplineCurve, IExpConvertableFrom<StepBSplineCurveWithKnots>
    {

        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(
               StepModel model,
               IEnumerable<StepCartesianPoint> controlPoints )
            : base( model, controlPoints ) { }

        public StepBSplineCurveWithKnots(
               StepModel model,
               params StepCartesianPoint[] controlPoints )
            : base( model, 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;

        public void FromInstance( StepBSplineCurveWithKnots entity )
        {
            base.FromInstance( entity );
            KnotSpec = entity.KnotSpec;
            KnotMultiplicities.Clear();
            KnotMultiplicities.AddRange( entity.KnotMultiplicities );
            Knots.Clear();
            Knots.AddRange( entity.Knots );
        }

        internal static StepBSplineCurveWithKnots FromSyntax(
                                                  StepModel binder,
                                                  ExpSyntaxNode syntaxList )
        {
            ExpNodePresidentEnumerator enumerator = syntaxList .ToPresidentEnumerator();
            enumerator.AssertEnumeratorCount( 9 );
            ExpNodePresidentEnumerator controlPointsList = enumerator[ 2 ].TupleToPresidentEnumerator(
                );

            StepBSplineCurveWithKnots spline = new StepBSplineCurveWithKnots(
                binder, new StepCartesianPoint[controlPointsList.Count] );
            spline.Name = ( enumerator[ 0 ]as ExpStringNode )!.Value;
            spline.Degree = ( enumerator[ 1 ] as ExpIntNode )!.Value;

            for( int i = 0; i < controlPointsList.Count; i++ )
            {
                int j = i; // capture to avoid rebinding
                spline.ControlPointsList[ j ] = binder[ controlPointsList[ j ] ]as StepCartesianPoint;
            }

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

            ExpNodePresidentEnumerator knotMultiplicitiesList = enumerator[ 6 ].TupleToPresidentEnumerator(
                );
            spline.KnotMultiplicities.Clear();
            for( int i = 0; i < knotMultiplicitiesList.Count; i++ ) {
                spline.KnotMultiplicities.Add( ( knotMultiplicitiesList[ i ]as ExpIntNode )!.Value );
            }

            ExpNodePresidentEnumerator knotsList = enumerator[ 7 ].TupleToPresidentEnumerator();
            spline.Knots.Clear();
            for( int i = 0; i < knotsList.Count; i++ ) {
                spline.Knots.Add( ( knotsList[ i ]as ExpRealNumberNode )!.Value );
            }

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

            return spline;
        }

        private static string GetKnotSpec( StepKnotType spec )
        {
            return spec switch
            {
                StepKnotType.UniformKnots => UNIFORM_KNOTS,
                StepKnotType.QuasiUniformKnots => QUASI_UNIFORM_KNOTS,
                StepKnotType.PiecewiseBezierKnots => PIECEWISE_BEZIER_KNOTS,
                StepKnotType.Unspecified => UNSPECIFIED,
                _ => throw new NotImplementedException(),
            };
        }

        private static StepKnotType ParseKnotSpec( string enumerationValue )
        {
            return enumerationValue.ToUpperInvariant() switch
            {
                UNIFORM_KNOTS => StepKnotType.UniformKnots,
                QUASI_UNIFORM_KNOTS => StepKnotType.QuasiUniformKnots,
                PIECEWISE_BEZIER_KNOTS => StepKnotType.PiecewiseBezierKnots,
                _ => StepKnotType.Unspecified,
            };
        }

    }
}