今天有点时间，才记起来上一次写的画线框，接着上一节画线，我们这节来看一下GL画线

直接上代码

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class joint{  
    public Vector3 org;  
    public Vector3 end;  
}  

public class example : MonoBehaviour {

    Event e;    
    private Vector3 orgPos;    
    private Vector3 endPos;    
    private bool canDrawLines  = false;    
    ArrayList posAL;  
    ArrayList temppos;  
    public Material lineMaterial;  
    public List  Pos = new List ();

    void Start()  
    {  
        temppos=new ArrayList();  
        posAL=new  ArrayList();  
    }  
    void Update()  
    {  
        if(Input.GetMouseButtonUp(0))  
        {  
            canDrawLines = true;    
        }  
        if(e.type!=null &canDrawLines) 
        {    
            if(e.type == EventType.MouseDown)    
            {    
                
                orgPos=Input.mousePosition;
                  

            }    
            
            if(e.type==EventType.MouseUp)    
            {    
                
                  
                endPos=Input.mousePosition; 
                Pos.Add (endPos);
                for (int i = 0; i < Pos.Count-1; i++) {
                    Vector3 p = Pos [i];
                }
                GLDrawLine (orgPos, endPos);
                orgPos = endPos;

            }    
        }    

    }  

    void GLDrawLine(Vector3 beg ,Vector3 end )    
    {  
        
        if(!canDrawLines)    
            return;    
        GL.PushMatrix ();  
        GL.LoadOrtho ();    

        beg.x=beg.x/Screen.width;    
        end.x=end.x/Screen.width;    
        beg.y=beg.y/Screen.height;    
        end.y=end.y/Screen.height;    
        joint tmpJoint = new joint();    
        tmpJoint.org=beg;    
        tmpJoint.end=end;    

        posAL.Add(tmpJoint);    
        lineMaterial.SetPass( 0 );    
        GL.Begin( GL.LINES );  
        GL.Color( new Color(1,1,1,1f) ); 

        for(int i= 1;i