ZEDGRAPH画图心得

  OleDbConnection odcConnection = new OleDbConnection(MyConnectionString); //打开连接 C#操作Access之按列读取mdb
             odcConnection.Open();
             OleDbCommand odCommandValue = odcConnection.CreateCommand();//value
             OleDbCommand odCommandYear = odcConnection.CreateCommand();//year

             odCommandValue.CommandText = "select 全年平均 from 洱海各月出流流量"; //读取全年平均项，建立读取 C#操作Access之按列读取mdb
             odCommandYear.CommandText = "select 年 from 洱海各月出流流量"; //读取year

             OleDbDataReader odrReaderValue = odCommandValue.ExecuteReader();//建立SQL查询value
             OleDbDataReader odrReaderYear = odCommandYear.ExecuteReader();//建立SQL查询year

             //ArrayList ArrValue = new ArrayList();//定义动态数组ArrValue
             //ArrayList ArrYear = new ArrayList();//定义动态数组ArrYear

             //double []Yearavrg;//数组定义
             //Yearavrg = new double[100];//初始化大小，分配内存
             //double []Year;//数组定义
             //Year = new double[100];

             double[] ArrValue;//数组定义
             ArrValue = new double[];//初始化大小，分配内存
             double[] ArrYear;//数组定义
             ArrYear = new double[];
             int im = , jm = ;
             while (odrReaderValue.Read())
             {
                //ArrValue.Add(odrReaderValue["全年平均"].ToString());//读取列的每一个
                 ArrValue[im] = Convert.ToDouble(odrReaderValue["全年平均"]);
                 im++;
             }
             while (odrReaderYear.Read())
             {
                 //ArrYear.Add(odrReaderYear["年"].ToString());//读取列的每一个
                 ArrYear[jm] = Convert.ToDouble(odrReaderYear["年"]);
                 jm++;
             }

             odrReaderValue.Close();
             odrReaderYear.Close();
             odcConnection.Close();
             //test
             //int leng = ArrValue.Count;//计算数组长度
             int leng = ArrValue.Length;

            // MessageBox.Show(leng.ToString());//test
             GraphPane MyPane=zedGraphControl1.GraphPane;
             MyPane.Title.Text = "洱海年平均出流流量";
             MyPane.XAxis.Title.Text = "年份";
             MyPane.YAxis.Title.Text = "流量（立方米每秒）";

             //
             PointPairList pplist = new PointPairList();//显示点数组
             //test-OK
             foreach (double a in ArrValue)
             {

                 textBox1.Text += a;
                 //pplist.Add(0,b);

             }

             //test-OK
             //foreach (string a in ArrYear)
             //foreach (string a in ArrValue)
             //{
             //    //MessageBox.Show(a);
             //    double b = double.Parse(a);//类型转换
             //    textBox1.Text += b;//test
             //}

             //foreach (string a in ArrValue)
             //{
             //    //MessageBox.Show(a);
             //    int i = 0;
             //    Yearavrg[i] = double.Parse(a);//类型转换
             //    i++;

             //}

             //foreach (string b in ArrYear)
             //{
             //    //MessageBox.Show(a);
             //    int i = 0;
             //    Year[i] = double.Parse(b);//类型转换
             //    i++;
             //    textBox1.Text+=Year[i].ToString();

             //}

             for (int i = ; i < leng; i++)
             {

                 pplist.Add(ArrYear[i], ArrValue[i]);//xaile是年，yaile是年平均流量值
             }

             LineItem myCurve = MyPane.AddCurve("流量",pplist,Color.Red,SymbolType.Diamond);//标注样式

             myCurve.Symbol.Fill = new Fill(Color.White);//背景填充白色
             MyPane.XAxis.MajorGrid.IsVisible = true;//显示X网格
             MyPane.YAxis.MajorGrid.IsZeroLine = true;//Y坐标不显示0坐标线

             // Align the Y axis labels so they are flush to the axis
             MyPane.YAxis.Scale.Align = AlignP.Inside;

             //坐标范围划定
             MyPane.YAxis.Scale.Min = -;
             MyPane.YAxis.Scale.Max = ;

             MyPane.XAxis.Scale.Min = ;
             MyPane.XAxis.Scale.Max = ;

             MyPane.Chart.Fill = new Fill(Color.White, Color.LightGray, 45.0f);

             // Add a text box with instructions
             TextObj text = new TextObj(
                 "左键拖拽放大\n鼠标中键滚放缩\n右键菜单",
                 0.05f, 0.95f, CoordType.ChartFraction, AlignH.Left, AlignV.Bottom);
             text.FontSpec.StringAlignment = StringAlignment.Near;
             MyPane.GraphObjList.Add(text);

             zedGraphControl1.IsShowHScrollBar = true;
             zedGraphControl1.IsShowVScrollBar = true;
             zedGraphControl1.IsAutoScrollRange = true;

             zedGraphControl1.IsShowPointValues = true;
             zedGraphControl1.PointValueEvent += new ZedGraphControl.PointValueHandler(MyPointValueHandler);
             // OPTIONAL: Add a custom context menu item
            // zedGraphControl1.ContextMenuBuilder += new ZedGraphControl.ContextMenuBuilderEventHandler(MyContextMenuBuilder);

             // OPTIONAL: Handle the Zoom Event
            // zedGraphControl1.ZoomEvent += new ZedGraphControl.ZoomEventHandler(MyZoomEvent);

             // Tell ZedGraph to calculate the axis ranges
             // Note that you MUST call this after enabling IsAutoScrollRange, since AxisChange() sets
             // up the proper scrolling parameters
             zedGraphControl1.AxisChange();
             // Make sure the Graph gets redrawn
             zedGraphControl1.Invalidate();
         }
         /// <summary>
         /// Display customized tooltips when the mouse hovers over a point
         /// </summary>
         private string MyPointValueHandler(ZedGraphControl control, GraphPane pane,CurveItem curve, int iPt)
         {
             // Get the PointPair that is under the mouse
             PointPair pt = curve[iPt];

            // return curve.Label.Text + " is " + pt.Y.ToString("f2") + " m3/s at " + pt.X.ToString("f1") + " 年";
             //return pt.X.ToString("f1") + "年"+curve.Label.Text + "是" + pt.Y.ToString("f2") + " wm3/s";
             return pt.X.ToString() + "年" + curve.Label.Text + "是" + pt.Y.ToString("f2") + " wm3/s";//OKZWJ
         }

         /// <summary>
         /// Customize the context menu by adding a new item to the end of the menu
         /// </summary>
         private void MyContextMenuBuilder(ZedGraphControl control, ContextMenuStrip menuStrip,
                         Point mousePt, ZedGraphControl.ContextMenuObjectState objState)
         {
             ToolStripMenuItem item = new ToolStripMenuItem();
             item.Name = "add-beta";
             item.Tag = "add-beta";
             item.Text = "Add a new Beta Point";
             item.Click += new System.EventHandler(AddBetaPoint);

             menuStrip.Items.Add(item);
         }

         /// <summary>
         /// Handle the "Add New Beta Point" context menu item.  This finds the curve with
         /// the CurveItem.Label = "Beta", and adds a new point to it.
         /// </summary>
         private void AddBetaPoint(object sender, EventArgs args)
         {
             // Get a reference to the "Beta" curve IPointListEdit
             IPointListEdit ip = zedGraphControl1.GraphPane.CurveList["Beta"].Points as IPointListEdit;
             if (ip != null)
             {
                 double x = ip.Count * 5.0;
                 double y = Math.Sin(ip.Count * Math.PI / 15.0) * 16.0 * 13.5;
                 ip.Add(x, y);
                 zedGraphControl1.AxisChange();
                 zedGraphControl1.Refresh();
             }
         }

         // Respond to a Zoom Event
         private void MyZoomEvent(ZedGraphControl control, ZoomState oldState,ZoomState newState)
         {
             // Here we get notification everytime the user zooms
         }

     }

调试蛮辛苦的，尝试了很多次，各种改变，最后终于可以了！！！