ComponentOne Chart是
ComponentOne Studio for WPF中的一个子控件,主要帮助开发人员进行数据的图表可视化显示,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);