ccircle.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;

namespace 拾取
{
	/// <summary>
	/// CCircle 的摘要说明。
	/// </summary>
	public class CCircle
	{
		protected PointF m_Center,m_pCircle;
		Module m=new Module();

		public PointF Center
		{
			get{return m_Center;}
			set{m_Center=value;}
		}

		public PointF PCircle
		{
			get{return m_pCircle;}
			set{m_pCircle=value;}
		}

		public float Radius
		{
			get
			{
				float r=m.DistPtoP(m_Center,m_pCircle);
				return r;
			}
		}

		public CCircle()
		{
		}
		
		public CCircle(PointF pCenter,PointF pCircle) 
		{
			m_Center=pCenter;
			m_pCircle=pCircle;
		}

		//绘圆
		public void Draw(Graphics g,Pen aPen)
		{
			g.DrawEllipse(aPen, m_Center.X - Radius, 
				m_Center.Y - Radius, Radius * 2, Radius * 2);
		}
	}
}