cline.cs

苏金明编写的《用VB.NET和VC#.NET开发交互式CAD系统》一书的源代码

using System;
using System.Drawing;
using System.Drawing.Drawing2D;

namespace 图元求交
{
	/// <summary>
	/// CLine 的摘要说明。
	/// </summary>
	public class CLine
	{
		private PointF m_Begin,m_End;

		public PointF LBegin
		{ 
			get{return m_Begin;}
			set{m_Begin = value;}
		}

		public PointF LEnd
		{ 
			get{return m_End;}
			set{m_End = value;}
		}

		public CLine()
		{
		}

		public CLine(PointF pBegin, PointF pEnd)
		{
			m_Begin = pBegin;
			m_End = pEnd;
		}

		public void Draw( Graphics g, Pen aPen)
		{
			g.DrawLine(aPen, m_Begin, m_End);
		}

		public bool Pick( Point p)
		{
			GraphicsPath gp=new GraphicsPath();
			gp.AddLine(m_Begin, m_End);
			if (gp.IsOutlineVisible(p.X, p.Y, Pens.Blue))
		    {
				return true;
	        }
			else
	        {
				return false;
			}
		}
	}
}