本文主要介绍如何给 C1Chart for Silverlight 添加鼠标跟踪行为，最终会显示一条垂直红线以及红线与各个系列的交点，主要步骤：
1、添加垂直线
2、添加垂直线和系列交点的显示
3、在鼠标移动时动态改变垂直线和交点标识的位置
- public partial class MainPage : UserControl
- {
- ChartPanel pnl = new ChartPanel();
- List<Ellipse> markers;
- public MainPage()
- {
- InitializeComponent();
- AddLine();
- AddMarkers();
- chart.View.Layers.Add(pnl);
- chart.MouseMove += new MouseEventHandler(chart_MouseMove);
- }
- void AddLine()
- {
- Point p = new Point(0, double.NaN);
- var dt = (DataTemplate)Resources["line"];
- var cpo = (ChartPanelObject)dt.LoadContent();
- cpo.DataPoint = p;
- cpo.Action = ChartPanelAction.MouseMove;
- cpo.Attach = ChartPanelAttach.DataXY;
- pnl.Children.Add(cpo);
- }
- void AddMarkers()
- {
- markers = new List<Ellipse>();
- for (int i = 0; i < chart.Data.Children.Count; i++)
- {
- Ellipse ep = new Ellipse();
- ep.Width = 50;
- ep.Height = 50;
- ep.Stroke = new SolidColorBrush(Colors.Blue);
- ep.Fill = new SolidColorBrush(Color.FromArgb(64, 0, 0, 255));
- markers.Add(ep);
- chart.View.Children.Add(ep);
- }
- }
- void SetMarkerPosition(Point pt)
- {
- double dis1;
- for (int i = 0; i < markers.Count; i++)
- {
- int p = chart.View.DataIndexFromPoint(pt, i, MeasureOption.X, out dis1);
- Point ps1 = chart.View.DataIndexToPoint(i, p);
- Canvas.SetLeft(markers[i], ps1.X - markers[i].Width / 2);
- Canvas.SetTop(markers[i], ps1.Y - markers[i].Height / 2);
- }
- }
- void chart_MouseMove(object sender, MouseEventArgs e)
- {
- SetMarkerPosition(e.GetPosition(this));
- }
-
- }
运行截图：
源码下载：VS2010 + Silverlight 5.0 + C1 Studio for Silverlight 2012V2
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