netDxf/Entities/Viewport.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 netDxf.Tables;

namespace netDxf.Entities
{
    /// <summary>
    /// Represents a view in paper space of the model.
    /// </summary>
    /// <remarks>
    /// The viewport with id equals 1 is the view of the paper space layout itself and it does not show the model.
    /// </remarks>
    public class Viewport :
        EntityObject
    {
        #region private fields

        private Vector3 center;
        private double width;
        private double height;
        private short stacking;
        private short id;
        private Vector2 viewCenter;
        private Vector2 snapBase;
        private Vector2 snapSpacing;
        private Vector2 gridSpacing;
        private Vector3 viewDirection;
        private Vector3 viewTarget;
        private double lensLength;
        private double frontClipPlane;
        private double backClipPlane;
        private double viewHeight;
        private double snapAngle;
        private double twistAngle;
        private short circleZoomPercent;
        private ViewportStatusFlags status;
        private readonly List<Layer> frozenLayers;
        private Vector3 ucsOrigin;