在本篇文章中，我们将阐述如何定制 C1WPFChart 数据点的标记。
下面分步讲解实现：
1.定制自定义样式：
1: <Window.Resources>
2: <Style x:Key="happy" TargetType="{x:Type c1:PlotElement}">
3: <Setter Property="Stroke" Value="Transparent"/>
4: <Setter Property="Fill">
5: <Setter.Value>
6: <ImageBrush>
7: <ImageBrush.ImageSource>
8: <BitmapImage UriSource="pack://application:,,,/Images/happy.jpg"/>
9: </ImageBrush.ImageSource>
10: </ImageBrush>
11: </Setter.Value>
12: </Setter>
13: </Style>
14: </Window.Resources>
2.现在，我们可以指定自定义的 SymbolStyle 到 C1WPFChart 。
3.通过 XAML 加载样式：
1: <c1:DataSeries Label="Growth" SymbolStyle="{StaticResource happy}" SymbolMarker="Box" SymbolSize="30,30" RenderMode="Default" Values="20 45 19 24 25 5 15 30 12 40" />
4.通过 PlotElementLoaded 事件加载。
1: private void DataSeries_PlotElementLoaded(object sender, EventArgs e)
2: {
3: PlotElement pe = (PlotElement)sender;
4:
5: if (!(pe is Lines)) // skip lines
6: {
7: DataPoint dp = pe.DataPoint;
8: pe.Fill = new ImageBrush(new BitmapImage(new Uri("pack://application:,,,/Images/happy.jpg")));
9: }
10: }
同时，通过后台代码进行不同图表数据标记的定制：
1: private void DataSeries_PlotElementLoaded(object sender, EventArgs e)
2: {
3: PlotElement pe = (PlotElement)sender;
4:
5: if (!(pe is Lines)) // skip lines
6: {
7: DataPoint dp = pe.DataPoint;
8: pe.Stroke = Brushes.Transparent;
9: if (dp.Value <= 20)
10: {
11: pe.Fill = new ImageBrush(new BitmapImage(new Uri("pack://application:,,,/Images/sad.jpg")));
12: }
13: else if (dp.Value > 20)
14: {
15: pe.Fill = new ImageBrush(new BitmapImage(new Uri("pack://application:,,,/Images/happy.jpg")));
16: }
17: }
18: }
效果图：
Demo 下载：
点击下载： CS_DEMO
点击下载： VB.NET_Demo