netDxf/Entities/Spline.cs

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#region netDxf, Copyright(C) 2014 Daniel Carvajal, Licensed under LGPL.

//                        netDxf library
// Copyright (C) 2014 Daniel Carvajal (haplokuon@gmail.com)
// 
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 

#endregion

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using netDxf.Tables;

namespace netDxf.Entities
{
    /// <summary>
    /// Represents a spline curve <see cref="EntityObject">entity</see> (NURBS Non-Uniform Rational B-Splines).
    /// </summary>
    public class Spline :
        EntityObject
    {
        #region private fields

        private List<SplineVertex> controlPoints;
        private double[] knots;
        private readonly SplineTypeFlags flags;
        private readonly short degree;
        private readonly bool isClosed;
        private readonly bool isPeriodic;

        #endregion

        #region contructors

        /// <summary>
        /// Initializes a new instance of the <c>Spline</c> class.
        /// </summary>
        /// <param name="controlPoints">Spline control points.</param>
        /// <param name="knots">Spline knot vector.</param>
        /// <param name="degree">Degree of the spline curve.  Valid values are 1 (linear), degree 2 (quadratic), degree 3 (cubic), and so on up to degree 10.</param>
        public Spline(List<SplineVertex> controlPoints, double[] knots, short degree)
            : base(EntityType.Spline, DxfObjectCode.Spline)
        {
            if (degree < 1 || degree > 10)
                throw (new ArgumentOutOfRangeException("degree", degree, "The spline degree valid values range from 1 to 10."));
            if (controlPoints == null)