WPF专业编程指南(wpf 网络编程)

qiaoqingyi 01-09 112

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　　本文主要介绍如何在C1Chart for WPF中创建一个可以移动的线，使得当鼠标拖拽的时候，可以在Chart上自由移动。为了显示拖拽的线，需要创建一个Marker。本文创建一条竖直的Marker，通过创建ChartPanelObject实现，将ChartPanelObject的Action属性设置为LeftButtonDrag，实现鼠标左键的拖拽。

　　使用ChartPanelObject创建竖直的线，代码参考：

　　ChartPanelObject CreateMarker(bool isHorizontal) { var obj = new ChartPanelObject(); var bdr = new Border() { BorderBrush = Background = new SolidColorBrush(Color.FromArgb(150, 255, 2, 2)), Padding = new Thickness(2), }; var tb = new TextBlock(); var bind = new Binding(); bind.Source = obj; if (isHorizontal) { bdr.BorderThickness = new Thickness(0, 4, 0, 0); bdr.Margin = new Thickness(0, -1, 0, 0); obj.HorizontalContentAlignment = HorizontalAlignment.Stretch; bind.StringFormat = "y={0:#.#}"; bind.Path = new PropertyPath("DataPoint.Y"); obj.DataPoint = new Point(double.NaN, 0.5); } else { bdr.BorderThickness = new Thickness(4, 0, 0, 0); bdr.Margin = new Thickness(-1, 0, 0, 0); obj.VerticalContentAlignment = VerticalAlignment.Stretch; bind.StringFormat = "x={0:#.#}"; bind.Path = new PropertyPath("DataPoint.X"); obj.DataPoint = new Point(2, double.NaN); } tb.SetBinding(TextBlock.TextProperty, bind); bdr.Child = tb; bdr.IsHitTestVisible = true; obj.Content = bdr; return obj; }

　　通过bind.Path = new PropertyPath("DataPoint.X")，让这条拖拽的线展示X轴的数据。实现鼠标左键的代码参考：

　　var vmarker = CreateMarker(false); pnl.Children.Add(vmarker); vmarker.Action = ChartPanelAction.LeftMouseButtonDrag; chart.View.Layers.Add(pnl);

　　实现的效果如下：

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