Canvas/DrawTools/ArcCircleTool.cs

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using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
using System.Xml;

namespace Canvas.DrawTools
{
	interface IArc
	{
		UnitPoint	Center		{ get; }
		float		Radius		{ get; }
		float		StartAngle	{ get; }
		float		EndAngle	{ get; }
	}
	class NodePointArcCenter : INodePoint
	{
		protected Arc m_owner;
		protected Arc m_clone;
		protected UnitPoint m_originalPoint;
		protected UnitPoint m_endPoint;
		public NodePointArcCenter(Arc owner)
		{
			m_owner = owner;
			m_clone = m_owner.Clone() as Arc;
			m_originalPoint = m_owner.Center;
		}
		#region INodePoint Members
		public IDrawObject GetClone()
		{
			return m_clone;
		}
		public IDrawObject GetOriginal()
		{
			return m_owner;
		}
		public virtual void SetPosition(UnitPoint pos)
		{
			m_clone.Center = pos;
		}
		public virtual void Finish()
		{
			m_endPoint = m_clone.Center;
			m_owner.Center = m_clone.Center;
			m_owner.Radius = m_clone.Radius;
			m_owner.Selected = true;
			m_clone = null;
		}
		public void Cancel()
		{
			m_owner.Selected = true;
		}
		public virtual void Undo()
		{
			m_owner.Center = m_originalPoint;
		}
		public virtual void Redo()
		{