PDFPatcher/App/Model/TextRegion.cs

using System;
using System.Collections.Generic;
using System.Text;

namespace PDFPatcher.Model
{
	[System.Diagnostics.DebuggerDisplay ("{Direction}({Region.Top},{Region.Left})Lines={Lines.Count}")]
	sealed class TextRegion
	{
		internal WritingDirection Direction { get; set; }
		internal Bound Region { get; private set; }

		/// <summary>
		/// 获取文本区域中的行。
		/// 不应该调用此属性的 Add 方法添加行，而应使用 <see cref="TextRegion.AddLine"/> 方法。
		/// </summary>
		internal List<TextLine> Lines { get; private set; }

		internal TextRegion () {
			this.Lines = new List<TextLine> ();
		}

		internal TextRegion (TextLine text) : this () {
			this.Region = new Bound (text.Region);
			this.AddLine (text);
		}

		internal void AddLine (TextLine line) {
			if (this.Direction == WritingDirection.Unknown) {
				var d = this.Region.GetDistance (line.Region, WritingDirection.Unknown);
				this.Direction = (d.Location == DistanceInfo.Placement.Up || d.Location == DistanceInfo.Placement.Down)
					? WritingDirection.Vertical
					: (d.Location == DistanceInfo.Placement.Left || d.Location == DistanceInfo.Placement.Right)
					? WritingDirection.Hortizontal
					: WritingDirection.Unknown;
			}
			this.Lines.Add (line);
			this.Region.Merge (line.Region);
		}


	}
}