cmirror.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.Collections;
using System.Drawing;

namespace VCSharp
{
	/// <summary>
	/// CMirror 的摘要说明。
	/// </summary>
	/// 

	public class CMirror:ICommand
	{
		private int m_Step;
		private PointF m_Pos1;
		private PointF m_Pos2;
  
		public CMirror()
		{
			//
			// TODO: 在此处添加构造函数逻辑
			//
		}

		public void LButtonDown(Graphics g,PointF aPos,ArrayList ges,ArrayList geSels)
		{
			m_Step+=1;

			switch (m_Step) 
			{
				case 1:
					m_Pos1=aPos;
					m_Pos2=aPos;
					break;
				case 2:
					//清除最后一条橡皮线
					CLine tempLine=new CLine(m_Pos1,m_Pos2);
					tempLine.Draw(g,DrawMode.Drag);
					tempLine=null;
 
					//将所有被选中的图元移动到目标位置并进行绘制
					if (geSels.Count>0) 
					{
						for (int i=0;i< geSels.Count;i++) 
						{
							//清除图元在当前位置上的图形
							((CGElement)(geSels[i])).Draw(g,DrawMode.Delete);
							((CGElement)(geSels[i])).Mirror(g,m_Pos1,m_Pos2);
							((CGElement)(geSels[i])).Draw(g,DrawMode.Selec);
						}
					}
      
					m_Step=0;
					break;
			}
		}

		public void MouseMove(Graphics g,PointF aPos)
		{
			switch (m_Step) 
			{
			  case 1:
				  PointF prePos=new PointF();
				  PointF  curPos=new PointF();
				  prePos =m_Pos2;
				  curPos =aPos;
				  //清除上一条橡皮线
				  CLine tempLine1=new CLine(m_Pos1,prePos);
				  tempLine1.Draw(g,DrawMode.Drag);
				  tempLine1=null;

				  //绘当前位置的橡皮线
				  CLine tempLine2=new CLine(m_Pos1,curPos);
				  tempLine2.Draw(g,DrawMode.Drag);
				  tempLine2=null;

				  m_Pos2=aPos;
				  break;
			}
		}

		//单击鼠标右键时的绘图行为
		public void  RButtonDown(Graphics g,PointF aPos)
		{
			if (m_Step==1) 
			{
				//清除上一条橡皮线
				CLine tempLine=new CLine(m_Pos1,m_Pos2);
				tempLine.Draw(g,DrawMode.Drag);
				tempLine=null;
			}
		}
	}
}