将水平线添加到Silverlight Toolkit柱形图

Question

我在WPF项目中使用Silverlight Toolkit，我想在我可以指定的Y轴值的柱形图中添加一条红色虚线水平线。我已经修改了图表模板并成功添加了一行，但我不知道如何让行显示在我想要的y轴值以及如何让它在整个图表中展开。这是我到目前为止的图表图片：

这是我用来生成它的图表模板XAML代码：

            <charting:Chart Name="chartUsageHours" Grid.Column="1" BorderThickness="0" Padding="0" Loaded="chartUsageHours_Loaded">
            <charting:Chart.Template>
                <ControlTemplate TargetType="{x:Type charting:Chart}">
                    <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}">
                        <Grid>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="Auto" />
                                <RowDefinition Height="*" />
                            </Grid.RowDefinitions>
                            <datavis:Title Content="{TemplateBinding Title}" Style="{TemplateBinding TitleStyle}" />
                            <chartingprimitives:EdgePanel Name="ChartArea" Style="{TemplateBinding ChartAreaStyle}" Grid.Row="1" Margin="0,0,0,0">
                                <Grid Panel.ZIndex="-1" Style="{TemplateBinding PlotAreaStyle}" />
                                <Border Panel.ZIndex="10" BorderBrush="#FF919191" BorderThickness="1, 0, 0, 1" />
                                <Grid Name="HoursThresholdContainer" Canvas.ZIndex="1" Background="Transparent">
                                    <Grid Name="HoursThreshold">
                                        <Line Name="Horizontal" HorizontalAlignment="Stretch" X1="0" Y1="100" X2="600" Y2="100" Stroke="Red" StrokeDashArray="4, 2"/>
                                    </Grid>
                                </Grid>
                            </chartingprimitives:EdgePanel>
                        </Grid>
                    </Border>
                </ControlTemplate>
            </charting:Chart.Template>
            <charting:Chart.Series>
                <charting:StackedColumnSeries Visibility="{Binding Include_OnTimeVsFitTime, Converter={StaticResource BooleanToVisibilityConverter}}">
                    <charting:StackedColumnSeries.IndependentAxis>
                        <charting:CategoryAxis Orientation="X" SortOrder="None" ShowGridLines="False">
                            <charting:CategoryAxis.AxisLabelStyle>
                                <Style TargetType="charting:AxisLabel">
                                    <Setter Property="Template">
                                        <Setter.Value>
                                            <ControlTemplate TargetType="charting:AxisLabel">
                                                <TextBlock Text="{Binding Converter={StaticResource DateStringConverter}}" FontSize="8">
                                                    <TextBlock.LayoutTransform>
                                                        <RotateTransform Angle="-90"/>
                                                    </TextBlock.LayoutTransform>
                                                </TextBlock>
                                            </ControlTemplate>
                                        </Setter.Value>
                                    </Setter>
                                </Style>
                            </charting:CategoryAxis.AxisLabelStyle>
                        </charting:CategoryAxis>
                    </charting:StackedColumnSeries.IndependentAxis>
                    <charting:SeriesDefinition ItemsSource="{Binding ChartUsageHours}" DependentValuePath="Value" IndependentValuePath="Key" />
                    <charting:SeriesDefinition ItemsSource="{Binding ChartOnTimeHours}" DependentValuePath="Value" IndependentValuePath="Key" />
                </charting:StackedColumnSeries>
                <charting:StackedColumnSeries Visibility="{Binding DontInclude_OnTimeVsFitTime, Converter={StaticResource BooleanToVisibilityConverter}}">
                    <charting:SeriesDefinition ItemsSource="{Binding ChartUsageHours}" DependentValuePath="Value" IndependentValuePath="Key" />
                </charting:StackedColumnSeries>
            </charting:Chart.Series>
        </charting:Chart>

有没有人知道如何做到这一点？

谢谢， 保罗

Answer 1

顺便说一下，我创建了一个更通用的图表，可以处理任何类型的系列（Column，Bar，StackedColumn等），并将任何值显示为一行。

我已在blog post中解释了此图表的用法。

可以下载源代码here。

Answer 2

您可以设置一个Line的Stretch="Fill"以使其延伸整个长度

至于沿Y轴对齐它，我会尝试绑定到Y1 / Y2属性，或者将行放在Canvas或Grid控件中，该控件同时包含{{1和} Chart以及绑定Line来设置其位置

Answer 3

获取在Y轴上调用GetPlotAreaCoordinate方法所需的行的y位置

chart.Axes[1].GetPlotAreaCoordinate(value) // you could name your axis if you like.

Answer 4

我最终根据此处描述的技术http://www.scottlogic.co.uk/blog/colin/2009/03/adding-a-location-crosshair-to-silverlight-charts-again/实现了一些东西。