netDxf/Entities/Attribute.cs

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

//                        netDxf library
// Copyright (C) 2013 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 attribute <see cref="EntityObject">entity</see>.
    /// </summary>
    /// <remarks>
    /// The attribute position, rotation, height and width factor values also includes the transformation of the <see cref="Insert">Insert</see> entity to which it belongs.<br />
    /// During the attribute initialization a copy of all attribute definition properties will be copied,
    /// so any changes made to the attribute definition will only be applied to new attribute instances and not to existing ones.
    /// This behaviour is to allow imported <see cref="Insert">Insert</see> entities to have attributes without definition in the block, 
    /// althought this might sound not totally correct it is allowed by AutoCad.
    /// </remarks>
    public class Attribute :
        EntityObject
    {
        #region private fields

        private AttributeDefinition definition;
        private string tag;
        private object value;
        private TextStyle style;
        private Vector3 position;
        private AttributeFlags flags;
        private double height;
        private double widthFactor;
        private double rotation;
        private TextAlignment alignment;

        #endregion

        #region constructor

        internal Attribute()
            : base(EntityType.Attribute, DxfObjectCode.Attribute)