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WorkFlowImage.aspx.cs：源码内容
							﻿using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.Drawing.Imaging;
using ClassDrawableObjects.com.etong;
using com.etong.DAL.FC;
public struct TaskPoint
{
    public int TaskID;
    public Point Center;
    //public TaskPoint(int iTaskID, Point pCenter)
    //{
    //    TaskID = iTaskID;
    //    Center = pCenter;
    //}
}
public partial class Workflow_WorkFlowImage : System.Web.UI.Page
{
    private TaskPoint[] mept;
    private DShapeList drawingList;
    private const int initX =250;               //初始圆心X坐标
    private const int initY =50;                //初始圆心Y坐标
    private const int ellipseW =109;            //椭圆宽
    private const int ellipseH =69;             //椭圆高
    private const int distanceX = 50;           //X方向间距
    private const int distanceY = 50;           //Y方向间距
    private const int canvasW = 500;            //画布宽
    private const int canvasH =440;             //画布高
    private int RealWidth = canvasW;      //实际宽
    private int RealHeight = canvasH ;    //实际高
    protected void Page_Load(object sender, EventArgs e)
    {
        //在此处放置初始化页的用户代码
        int iWFID;
        
        drawingList = new DShapeList();
        try
        {
            iWFID = Convert.ToInt32( Request.QueryString["PID"]);
        }
        catch
        {
            iWFID = -1;
        }
        EtongFlyChouWFTask tsk = EtongFlyChouWFTask.GetInitTask(iWFID);
        if (tsk !=null) 
        {
            //绘制初始任务
            DFilledEllipse ellipse = new DFilledEllipse(new Point(initX, initY), new Size(ellipseW, ellipseH), Color.Black, Color.FromArgb(204, 255, 204));
            ellipse.Desc = tsk.TaskName;
            drawingList.Add(ellipse);
            mept = new TaskPoint[1];
            mept[0].TaskID = tsk.TaskID;
            mept[0].Center = new Point(initX, initY);
            DrawProcess(tsk);
        }
        
        Response.ContentType = "image/gif";
        Bitmap bitMap = new Bitmap(RealWidth, RealHeight);
        Graphics g = System.Drawing.Graphics.FromImage(bitMap);
        try 
        {
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
            g.Clear(Color.White);
            drawingList.DrawList(g);
            bitMap.Save(Response.OutputStream,ImageFormat.Gif);
        }
        finally 
        {
            g.Dispose();
            bitMap.Dispose();
        }
    }
    
    protected Point GetPreTaskCenter(int TaskID)
    {
        int i;
        if (mept != null)
        {
            for (i=0;i<mept.Length;i++)
            {
                if (mept[i].TaskID == TaskID)
                {
                    return mept[i].Center;
                }
            }
        }
        return mept[0].Center;
    }
    protected void DrawProcess(EtongFlyChouWFTask tsk)
    {
        DFilledEllipse ellipse;
        DLine line;
        ArrayList al,al1;
        int i;
        if (tsk != null)
        {
            //得到下一步任务
            al = tsk.GetNextTask();
            if (al != null)
            {
                if (al.Count==0) return;
                //获得上级任务的圆心位置
                Point prePt = this.GetPreTaskCenter(tsk.TaskID);
                int preX = prePt.X;
                int preY = prePt.Y;
                if (al.Count==1) 
                {
                    //只有一个下级任务
                    tsk = al[0] as EtongFlyChouWFTask;
                    //如果绘制过则无须继续
                    if (this.TaskHasDraw(tsk.TaskID) == true) return;
                    //得到上级任务
                    al1 = tsk.GetPrevioueTasks();
                    
                    if (al1.Count == 1)
                    {
                        //只有一个上级任务
                        mept = new TaskPoint[al.Count];
                        line = new DLine(new Point(preX, preY + ellipseH / 2), new Point(preX, preY + ellipseH / 2 + distanceY), Color.Black);
                        line.EndCap = System.Drawing.Drawing2D.LineCap.ArrowAnchor;
                        drawingList.Add(line);
                        ellipse = new DFilledEllipse(new Point(preX, preY + ellipseH + distanceY), new Size(ellipseW, ellipseH), Color.Black, Color.FromArgb(204, 255, 204));
                        ellipse.Desc = tsk.TaskName;
                        drawingList.Add(ellipse);
                        //mept(mept.Length);
                        //mept[mept.Length - 1].TaskID = tsk.TaskID;
                        //mept[mept.Length - 1].Center = new Point(preX, preY + ellipseH + distanceY);
                        mept[0].TaskID = tsk.TaskID;
                        mept[0].Center = new Point(preX, preY + ellipseH + distanceY);
                        //判断有无超过预定大小
                        //if (mept[mept.Length - 1].Center.X + ellipseW / 2 + 10 > RealWidth)
                        //{
                        //    RealWidth = mept[mept.Length - 1].Center.X + ellipseW / 2 + 10;
                        //}
                        //if (mept[mept.Length - 1].Center.Y + ellipseH / 2 + 10 > RealHeight)
                        //{
                        //    RealHeight = mept[mept.Length - 1].Center.Y + ellipseH / 2 + 10;
                        //}
                        if (mept[0].Center.X + ellipseW / 2 + 10 > RealWidth)
                        {
                            RealWidth = mept[0].Center.X + ellipseW / 2 + 10;
                        }
                        if (mept[0].Center.Y + ellipseH / 2 + 10 > RealHeight)
                        {
                            RealHeight = mept[0].Center.Y + ellipseH / 2 + 10;
                        }
                    }
                    else
                    {
                        //有若干个上级
                        //如果有一个上级未绘制则无须继续
                        for (i = 0; i < al1.Count; i++)
                        {
                            if (this.TaskHasDraw((al1[i] as EtongFlyChouWFTask).TaskID) == true) return;
                        }
                        int maxY = 0;
                        Point left = new Point(0, 0);
                        Point right = new Point(0, 0);
                        //找最深的椭圆圆心位置
                        for (i = 0; i < al1.Count; i++)
                        {
                            prePt = this.GetPreTaskCenter((al1[i] as EtongFlyChouWFTask).TaskID);
                            preY = prePt.Y;
                            if (preY > maxY) maxY = preY;
                        }
                        mept = new TaskPoint[al.Count];
                        for (i = 0; i < al1.Count; i++)
                        {
                            prePt = this.GetPreTaskCenter((al1[i] as EtongFlyChouWFTask).TaskID);
                            preX = prePt.X;
                            preY = prePt.Y;
                            line = new DLine(new Point(preX, preY + ellipseH / 2), new Point(preX, maxY + ellipseH / 2 + distanceY / 2), Color.Black);
                            line.EndCap = System.Drawing.Drawing2D.LineCap.ArrowAnchor;
                            drawingList.Add(line);
                            if (i == 0)
                            {
                                left = new Point(preX, maxY + ellipseH / 2 + distanceY / 2);
                            }
                            else if (i == al1.Count - 1)
                            {
                                right = new Point(preX, maxY + ellipseH / 2 + distanceY / 2);
                            }
                        }  //exit for
                        line = new DLine(left, right, Color.Black);
                        drawingList.Add(line);
                        line = new DLine(new Point((right.X + left.X) / 2, left.Y), new Point((right.X + left.X) / 2, left.Y + distanceY / 2), Color.Black);
                        line.EndCap = System.Drawing.Drawing2D.LineCap.ArrowAnchor;
                        drawingList.Add(line);
                        ellipse = new DFilledEllipse(new Point((right.X + left.X) / 2, left.Y + (distanceY + ellipseH) / 2), new Size(ellipseW, ellipseH), Color.Black, Color.FromArgb(204, 255, 204));
                        ellipse.Desc = tsk.TaskName;
                        drawingList.Add(ellipse);
                        //mept = new mept(mept.Length);
                        //mept[mept.Length - 1].TaskID = tsk.TaskID;
                        //mept[mept.Length - 1].Center = new Point((right.X + left.X) / 2, left.Y + distanceY);
                        mept[0].TaskID = tsk.TaskID;
                        mept[0].Center = new Point((right.X + left.X) / 2, left.Y + distanceY);
                        //判断有无超过预定大小
                        //if (mept[mept.Length - 1].Center.X + ellipseW / 2 + 10 > RealWidth)
                        //{
                        //    RealWidth = mept[mept.Length - 1].Center.X + ellipseW / 2 + 10;
                        //}
                        //if (mept[mept.Length - 1].Center.Y + ellipseH / 2 + 10 > RealHeight)
                        //{
                        //    RealHeight = mept[mept.Length - 1].Center.Y + ellipseH / 2 + 10;
                        //}
                        if (mept[0].Center.X + ellipseW / 2 + 10 > RealWidth)
                        {
                            RealWidth = mept[0].Center.X + ellipseW / 2 + 10;
                        }
                        if (mept[0].Center.Y + ellipseH / 2 + 10 > RealHeight)
                        {
                            RealHeight = mept[0].Center.Y + ellipseH / 2 + 10;
                        }
                    }// end if
                }
                else if (al.Count % 2 ==0) 
                {
                    mept = new TaskPoint[al.Count];
                    //有偶数个下级任务
                    double c = al.Count/2; //两侧各有几个椭圆
                    line = new DLine(new Point(preX,preY + ellipseH / 2), new Point(preX, preY + ellipseH / 2 + distanceY / 2), Color.Black);
                    line.EndCap = System.Drawing.Drawing2D.LineCap.ArrowAnchor;
                    drawingList.Add(line);
                    line = new DLine(new Point(Convert.ToInt32(preX - (ellipseW + distanceX) * (c-0.5)),preY + ellipseH / 2 + distanceY / 2), new Point(Convert.ToInt32( preX + (ellipseW + distanceX) * (c-0.5)), preY + ellipseH / 2 + distanceY / 2), Color.Black);
                    drawingList.Add(line);
                    for (i=0;i<al.Count;i++) 
                    {
                        tsk = al[i] as EtongFlyChouWFTask;
                        line = new DLine(new Point(Convert.ToInt32(preX - (ellipseW + distanceX) * (c - i-0.5)), preY + ellipseH / 2 + distanceY / 2), new Point(Convert.ToInt32(preX - (ellipseW + distanceX) * (c - i-0.5)), preY + ellipseH / 2 + distanceY), Color.Black);
                        line.EndCap = System.Drawing.Drawing2D.LineCap.ArrowAnchor;
                        drawingList.Add(line);
                        ellipse = new DFilledEllipse(new Point(Convert.ToInt32(preX - (ellipseW + distanceX) * (c - i-0.5)), preY + ellipseH + distanceY), new Size(ellipseW, ellipseH), Color.Black, Color.FromArgb(204, 255, 204));
                        ellipse.Desc = tsk.TaskName;
                        drawingList.Add(ellipse);
                        //mept[mept.Length - 1].TaskID = tsk.TaskID;
                        //mept[mept.Length - 1].Center = new Point(Convert.ToInt32(preX - (ellipseW + distanceX) * (c - i - 0.5)), preY + ellipseH + distanceY);
                        mept[i].TaskID = tsk.TaskID;
                        mept[i].Center = new Point(Convert.ToInt32(preX - (ellipseW + distanceX) * (c - i - 0.5)), preY + ellipseH + distanceY);
                        //判断有无超过预定大小
                        //if (mept[mept.Length - 1].Center.X + ellipseW/2 + 10 > RealWidth)
                        //{
                        //    RealWidth = mept[mept.Length - 1].Center.X + ellipseW/2 +10;
                        //}
                        //if (mept[mept.Length - 1].Center.Y + ellipseH/2 +10 >RealHeight)
                        //{
                        //    RealHeight = mept[mept.Length - 1].Center.Y + ellipseH/2 + 10;
                        //}
                        if (mept[i].Center.X + ellipseW / 2 + 10 > RealWidth)
                        {
                            RealWidth = mept[i].Center.X + ellipseW / 2 + 10;
                        }
                        if (mept[i].Center.Y + ellipseH / 2 + 10 > RealHeight)
                        {
                            RealHeight = mept[i].Center.Y + ellipseH / 2 + 10;
                        }
                    } // exit for
                }
                else 
                {
                    mept = new TaskPoint[al.Count];
                    //有奇数个下级任务
                    int c = (al.Count - 1) / 2;   //两侧各有几个椭圆
                    line = new DLine(new Point(preX, preY + ellipseH / 2), new Point(preX, preY + ellipseH / 2 + distanceY / 2), Color.Black);
                    line.EndCap = System.Drawing.Drawing2D.LineCap.ArrowAnchor;
                    drawingList.Add(line);
                    line = new DLine(new Point(preX - (ellipseW + distanceX) * c, preY + ellipseH / 2 + distanceY / 2), new Point(preX + (ellipseW + distanceX) * c, preY + ellipseH / 2 + distanceY / 2), Color.Black);
                    drawingList.Add(line);
                    for (i =0 ;i < al.Count;i++) 
                    {
                        tsk = al[i] as EtongFlyChouWFTask;
                        line = new DLine(new Point(preX - (ellipseW + distanceX) * (c - i), preY + ellipseH / 2 + distanceY / 2), new Point(preX - (ellipseW + distanceX) * (c - i), preY + ellipseH / 2 + distanceY), Color.Black);
                        line.EndCap = System.Drawing.Drawing2D.LineCap.ArrowAnchor;
                        drawingList.Add(line);
                        ellipse = new DFilledEllipse(new Point(preX - (ellipseW + distanceX) * (c - i), preY + ellipseH + distanceY), new Size(ellipseW, ellipseH), Color.Black, Color.FromArgb(204, 255, 204));
                        ellipse.Desc = tsk.TaskName;
                        drawingList.Add(ellipse);
                        //mept[mept.Length - 1].TaskID = tsk.TaskID;
                        //mept[mept.Length - 1].Center = new Point(preX - (ellipseW + distanceX) * (c - i), preY + ellipseH + distanceY);
                        mept[i].TaskID = tsk.TaskID;
                        mept[i].Center = new Point(preX - (ellipseW + distanceX) * (c - i), preY + ellipseH + distanceY);
                        //判断有无超过预定大小
                        //if (mept[mept.Length - 1].Center.X + ellipseW / 2 + 10 > RealWidth)
                        //{
                        //    RealWidth = mept[mept.Length - 1].Center.X + ellipseW / 2 + 10;
                        //}
                        //if (mept[mept.Length - 1].Center.Y + ellipseH / 2 + 10 > RealHeight)
                        //{
                        //    RealHeight = mept[mept.Length - 1].Center.Y + ellipseH / 2 + 10;
                        //}
                        if (mept[i].Center.X + ellipseW/2 + 10 > RealWidth)
                        {
                            RealWidth = mept[i].Center.X + ellipseW/2 +10;
                        }
                        if (mept[i].Center.Y + ellipseH/2 +10 > RealHeight)
                        {
                            RealHeight = mept[i].Center.Y + ellipseH/2 + 10;
                        }
                    } // exit for
                }//end al if
                //继续往下绘制
                //alold = al;
                //if (alold.Count > 0 && alold.Count != i) ;
                //else alold = al;
                for (i=0;i<al.Count;i++)
                {
                    tsk = al[i] as EtongFlyChouWFTask;
                    DrawProcess(tsk);
                }
            } // end if
         } // end if
    }
 
    private bool TaskHasDraw(int TaskID)
    {
        int i;
        if (mept == null) return false;
        else 
        {
            for (i=0;i< mept.Length;i++) 
            {
                if (mept[i].TaskID == TaskID) return true;
            }
            return false;
        }
    }
}

						