paintcoordinator.cs

网络应用

using System;
using System.Runtime.Remoting.Messaging;
using System.Collections;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Xml;
using System.Xml.Serialization;




//namespace PaintCoordinator
//{
	//Class Coordinator
	public class Coordinator: MarshalByRefObject
	{
		public Coordinator() {
			Console.WriteLine("Coordinator has been created...");
		}
		//声明NewStroke事件，客户端将会订阅此事件
		public event NewStrokeEventHandler NewStroke;
		//忽略默认的对象租用行为，使对象始终保存在内存中
		public override object InitializeLifetimeService() {
			return null;
		}
		//Define GetCurrentTime(), return the system's time
		public string GetCurrentTime() {
			return DateTime.Now.ToLongTimeString();
		}
		//定义DrawStroke处理程序，当某一个客户端远程调用此函数时，将会触发NewStroke事件，从而使得所有订阅NewStroke事件的客户端都会受到此事件
		[OneWay]
		public void DrawStroke(Stroke stroke) {
			if(NewStroke!=null)
				NewStroke(stroke);
		}
	}
	//Class Stroke
	[Serializable]
	public class Stroke {
		//Store the width of pen
		int penWidth;
		//Store the color of pen
		Color penColor;
		ArrayList Points=new ArrayList();
		//Constructor
		public Stroke(){
		}
		
		public Stroke(int x,int y) {
			Points.Add(new Point(x,y));
		}

		//属性
		public int PenWidth {
			get 
			{
				return penWidth;
			}
			set
			{
				penWidth=value;
			}
		}
		public Color PenColor {
			get
			{
				return penColor;
			}
			set
			{
				penColor=value;
			}
		}
		public int Count {
			get
			{
				return Points.Count;
			}
		}
		//
		public void Add(int x,int y) {
			Points.Add(new Point(x,y));
		}
		//DrawStroke函数用于将此线条绘出
		public void DrawStroke(Graphics g) {
			Pen pen=new Pen(penColor,penWidth);
			for(int i=0;i<Points.Count-1;i++) {
				g.DrawLine(pen,(Point)Points[i],(Point)Points[i+1]);

			}
			pen.Dispose();
		}
	}
	//Class RemoteDelegateObject
	public abstract class ReomteDelegateObject: MarshalByRefObject {
		public void NewStrokeCallback(Stroke stroke) {
			InternalNewStrokeCallback(stroke);
		}
		protected abstract void InternalNewStrokeCallback(Stroke stroke);
	}

    //声明一个委托
	public delegate void NewStrokeEventHandler(Stroke stroke);


//}