netDxf/Entities/HatchBoundaryPath.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;

namespace netDxf.Entities
{
    /// <summary>
    /// Represent a loop of a <see cref="Hatch">hatch</see> boundaries.
    /// </summary>
    /// <remarks>
    /// The entities that make a loop can be any combination of lines, polylines, circles, arcs, ellipses, and splines.<br />
    /// The entities that define a loop must define a closed path and they have to be on the same plane as the hatch, 
    /// if these conditions are not met the result will be unpredictable.<br />
    /// The entitiy normal and the elevation will be ignored. Only the x and y coordinates of the line, ellipse, the circle, and spline will be used.
    /// Circles, full ellipses, closed polylines, closed splines are closed paths so only one should exist in the edges list.
    /// Lines, arcs, ellipse arcs, open polylines, and open splines are open paths so more enties should exist to make a closed loop.
    /// </remarks>
    public class HatchBoundaryPath
    {
        public enum EdgeType
        {
            Polyline = 0,
            Line = 1,
            Arc = 2,
            Ellipse = 3,
            Spline = 4
        }

        public abstract class Edge
        {
            public readonly EdgeType Type;

            protected Edge(EdgeType type)
            {
                this.Type = type;
            }

            public abstract EntityObject ConvertTo();