private void Annotation_SelectedIndexChanged(object sender, System.EventArgs e)
        {
            Chart1.Annotations.Clear();

            AnnotationStyle.Items.Clear();
            AnnotationStyle.Enabled = false;

            AnnotationStyle1.Items.Clear();
            AnnotationStyle1.Enabled = false;
            AnnotationStyle2.Items.Clear();
            AnnotationStyle2.Visible = false;

            if(Annotation.SelectedItem.ToString() == "Line")
            {
                LineAnnotation annotation = new LineAnnotation();
                annotation.AnchorDataPoint = Chart1.Series[0].Points[1];
                annotation.Height = -25;
                annotation.Width = -25;
                annotation.LineWidth = 2;

                Chart1.Annotations.Add(annotation);

                SetLineControls(true);

            }
            else if(Annotation.SelectedItem.ToString() == "Vertical Line")
            {
                VerticalLineAnnotation annotation = new VerticalLineAnnotation();
                annotation.AnchorDataPoint = Chart1.Series[0].Points[1];
                annotation.Height = -25;
                annotation.LineWidth = 2;

                Chart1.Annotations.Add(annotation);

                SetLineControls(true);

            }
            else if(Annotation.SelectedItem.ToString() == "Horizontal Line")
            {
                HorizontalLineAnnotation annotation = new HorizontalLineAnnotation();
                annotation.AnchorDataPoint = Chart1.Series[0].Points[1];
                annotation.Width = -25;
                annotation.LineWidth = 2;

                Chart1.Annotations.Add(annotation);

                SetLineControls(true);
            }
            else if(Annotation.SelectedItem.ToString() == "Polyline")
            {
                PolylineAnnotation annotation = new PolylineAnnotation();
                annotation.AnchorDataPoint = Chart1.Series[0].Points[1];

                // explicitly set the relative height and width
                annotation.Height = 50;
                annotation.Width = 30;

                PointF [] points = new PointF[5];
                points[0].X = 0;
                points[0].Y = 0;

                points[1].X = 100;
                points[1].Y = 0;

                points[2].X = 0;
                points[2].Y = 100;

                points[3].X = 100;
                points[3].Y = 100;

                points[4].X = 0;
                points[4].Y = 50;

                annotation.GraphicsPath.AddPolygon(points);

                Chart1.Annotations.Add(annotation);

                SetLineControls(false);
            }
            else if(Annotation.SelectedItem.ToString() == "Text")
            {
                TextAnnotation annotation = new TextAnnotation();
                annotation.AnchorDataPoint = Chart1.Series[0].Points[1];
                annotation.Text = "I am a TextAnnotation";
                annotation.ForeColor = Color.Black;
                annotation.Font = new Font("Arial", 12);;

                Chart1.Annotations.Add(annotation);
                SetTextControls();

            }
            else if(Annotation.SelectedItem.ToString() == "Rectangle")
            {
                RectangleAnnotation annotation = new RectangleAnnotation();
                annotation.AnchorDataPoint = Chart1.Series[0].Points[1];
                annotation.Text = "I am a\nRectangleAnnotation";
                annotation.ForeColor = Color.Black;
                annotation.Font = new Font("Arial", 12);;
                annotation.LineWidth = 2;

                Chart1.Annotations.Add(annotation);

                SetTextControls();
                SetColorLineControls();
                AnnotationStyle1.SelectedIndex = 2;
            }
            else if(Annotation.SelectedItem.ToString() == "Ellipse")
            {
                EllipseAnnotation annotation = new EllipseAnnotation();
                annotation.AnchorDataPoint = Chart1.Series[0].Points[1];
                annotation.Text = "I am an EllipseAnnotation";
                annotation.ForeColor = Color.Black;
                annotation.Font = new Font("Arial", 12);;
                annotation.LineWidth = 2;
                annotation.Height = 35;
                annotation.Width = 60;

                Chart1.Annotations.Add(annotation);

                SetTextControls();
                SetColorLineControls();
                AnnotationStyle1.SelectedIndex = 2;

            }
            else if(Annotation.SelectedItem.ToString() == "Arrow")
            {
                ArrowAnnotation annotation = new ArrowAnnotation();
                annotation.AnchorDataPoint = Chart1.Series[0].Points[1];
                annotation.Height = -25;
                annotation.Width = -25;
                annotation.LineWidth = 2;

                Chart1.Annotations.Add(annotation);

                SetArrowControls();

            }
            else if(Annotation.SelectedItem.ToString() == "Border3D")
            {
                Border3DAnnotation annotation = new Border3DAnnotation();
                annotation.AnchorDataPoint = Chart1.Series[0].Points[1];
                annotation.Text = "I am a Border3DAnnotation";
                annotation.ForeColor = Color.Black;
                annotation.Font = new Font("Arial", 12);
                annotation.Height = 40;
                annotation.Width = 50;

                Chart1.Annotations.Add(annotation);

                SetBorder3DControls();

            }
            else if(Annotation.SelectedItem.ToString() == "Callout")
            {
                CalloutAnnotation annotation = new CalloutAnnotation();
                annotation.AnchorDataPoint = Chart1.Series[0].Points[1];
                annotation.Text = "I am a\nCalloutAnnotation";
                annotation.ForeColor = Color.Black;
                annotation.Font = new Font("Arial", 10);;
                annotation.Height = 35;
                annotation.Width = 50;

                Chart1.Annotations.Add(annotation);

                SetCalloutControls();

            }
            else if(Annotation.SelectedItem.ToString() == "Polygon")
            {
                PolygonAnnotation annotation = new PolygonAnnotation();
                annotation.AnchorDataPoint = Chart1.Series[0].Points[1];

                // explicitly set the relative height and width
                annotation.Height = 50;
                annotation.Width = 30;

                annotation.BackColor = Color.FromArgb(128, Color.Orange);

                // define relative value points for a polygon
                PointF [] points = new PointF[5];
                points[0].X = 0;
                points[0].Y = 0;

                points[1].X = 100;
                points[1].Y = 0;

                points[2].X = 100;
                points[2].Y = 100;

                points[3].X = 0;
                points[3].Y = 100;

                points[4].X = 50;
                points[4].Y = 50;

                annotation.GraphicsPath.AddPolygon(points);

                Chart1.Annotations.Add(annotation);

                SetColorControl();
                SetColorLineControls();

            }
            else if(Annotation.SelectedItem.ToString() == "Image")
            {
                if(Chart1.Images.IndexOf("MyBmp") < 0)
                {
                    Bitmap Bmp = new Bitmap(200, 75);
                    Graphics g = Graphics.FromImage(Bmp);
                    g.FillRectangle(new SolidBrush(Color.Transparent), 0, 0, Bmp.Width, Bmp.Height);
                    g.FillRectangle(new SolidBrush(Color.PaleGoldenrod), Bmp.Width/2, 0, Bmp.Width/2, Bmp.Height);
                    g.FillRectangle(new SolidBrush(Color.PaleVioletRed), 0, 0, Bmp.Width/2, Bmp.Height);
                    g.FillRectangle(new SolidBrush(Color.FromArgb(128, Color.DarkOrange)), 0, Bmp.Height/2, Bmp.Width, Bmp.Height/2);
                    g.DrawString("I am an ImageAnnotation", new Font("Arial", 12),
                        new SolidBrush(Color.Black),
                        new Rectangle( 0, 0, Bmp.Width, Bmp.Height));

                    g.Dispose();

                    Chart1.Images.Add(new NamedImage("MyBmp", Bmp));
                }

                ImageAnnotation annotation = new ImageAnnotation();
                annotation.AnchorDataPoint = Chart1.Series[0].Points[1];
                annotation.Image = "MyBmp";

                Chart1.Annotations.Add(annotation);
                StyleLabel1.Text = "";
                StyleLabel2.Text = "";
            }
        }
       //节点列表,节点信息刷新
       private void NodeList_SelectedIndexChanged(object sender, EventArgs e)
       {
           int intTarget;
           
           if (this.NodeList.SelectedIndex > -1)
           {
               intTarget = this.NodeList.SelectedIndex;
               SelectNode(intTarget, ComplexNet.Network[intTarget].Location);

               if (TabMain.TabPages.Contains(TabDegDist) == true )
               {
                   Border3DAnnotation txtShow = new Border3DAnnotation();//显示标注
                   DegreeChart.Annotations.Clear(); 
                   txtShow.Text ="节点:"+intTarget .ToString ();
                   txtShow.LineWidth = 2;
                   txtShow.LineColor = Color.Gainsboro;
                   txtShow.ForeColor = Color.Black;
                   txtShow.BackColor = Color.LightYellow;                
                   txtShow.AnchorDataPoint = DegreeChart.Series["DegLine"].Points[ComplexNet.Network[intTarget].Degree];
                   DegreeChart.Annotations.Add(txtShow);
               }
           }
       }