为了提高C1Chart WPF的大数据展现性能，特别是在Line和Symbol类型的Charts中，系统预设了一个办法：即我们可以通过设置 http://helpcentral.componentone.com/nethelp/c1wpfchart/#!XMLDocuments/WPFChartRef/html/P_C1_WPF_C1Chart_DataSeries_RenderMode.htm属性为RenderMode.Bitmap实现。
然而当设置RenderMode.Bitmap后，Tooltips和PlotElementLoaded 事件就失效了。
本篇博文介绍的方法， 在一个散点图中，通过RenderMode的属性设置为”Bitmap”来显示ToolTips：
实现的原理很简单：在Chart上增加ChartPanel 图层，再添加ChartPanelObject 即可。
实施步骤：
- 创建ChartPanel 和
- 在Chart中，给ChartPanel.Children
集合添加ChartPanelObject， 并把ChartPanel object添加到 1: var pnl = new ChartPanel();2:
3: var obj = new ChartPanelObject()4: {5: HorizontalAlignment = HorizontalAlignment.Right,
6: VerticalAlignment = VerticalAlignment.Bottom
7: };
8:
9: var bdr = new Border()10: {11: Background = new SolidColorBrush(Colors.Blue) { Opacity = 0.6 },12: BorderBrush = new SolidColorBrush(Colors.Blue),13: BorderThickness = new Thickness(1, 1, 3, 3),14: CornerRadius = new CornerRadius(6, 6, 0, 6),15: Padding = new Thickness(3)16: };
17:
18: var sp = new StackPanel();19:
20: var tb1 = new TextBlock();21: var bind1 = new Binding();22: bind1.Source = obj;
23: bind1.StringFormat = "x={0:#.##}";24: bind1.Path = new PropertyPath("DataPoint.X");
25: tb1.SetBinding(TextBlock.TextProperty, bind1);
26:
27: var tb2 = new TextBlock();28: var bind2 = new Binding();29: bind2.Source = obj;
30: bind2.StringFormat = "y={0:#.##}";31: bind2.Path = new PropertyPath("DataPoint.Y");
32: tb2.SetBinding(TextBlock.TextProperty, bind2);
33:
34: sp.Children.Add(tb1);
35: sp.Children.Add(tb2);
36:
37: bdr.Child = sp;
38:
39: obj.Content = bdr;
40: obj.DataPoint = new Point();41: obj.Action = ChartPanelAction.MouseMove;
42: obj.Attach = ChartPanelAttach.DataXY;
43:
44: pnl.Children.Add(obj);
45:
46: chart.View.Layers.Add(pnl);
47:
源码下载：
