Set The Color Of Negative Value On AreaSeries

[H]

How to give positive and negative values ​​set different colors.

ChartView can do it?

<chart:RadCartesianChart x:Name="chart1" Width="1725" Height="176" TrackBallLineStyle="{StaticResource trackBallLineStyle}" Grid.RowSpan="2" Loaded="chart1_Loaded">
                        <chart:RadCartesianChart.TrackBallInfoStyle>
                            <Style TargetType="chartView:TrackBallInfoControl">
                                <Setter Property="Template">
                                    <Setter.Value>
                                        <ControlTemplate TargetType="chartView:TrackBallInfoControl">
                                            <StackPanel Name="panel">
                                            </StackPanel>
                                        </ControlTemplate>
                                    </Setter.Value>
                                </Setter>
                            </Style>
                        </chart:RadCartesianChart.TrackBallInfoStyle>
                        <chart:RadCartesianChart.Behaviors>
                            <chartView:ChartTrackBallBehavior ShowIntersectionPoints="False" />
                        </chart:RadCartesianChart.Behaviors>
                        <chartView:AreaSeries CategoryBinding="Time" ValueBinding="Data"  Fill="#FFCC80"  Stroke="#FF9900" StrokeThickness="2"  ItemsSource="{Binding DemoList}" Loaded="AreaSeries_Loaded">
                            <chartView:AreaSeries.TrackBallInfoTemplate>
                                <DataTemplate>
                                    <StackPanel Orientation="Vertical" Margin="0,0,0,20">
                                        <Border Background="#666666" Width="65" Height="20" CornerRadius="3" HorizontalAlignment="Center" VerticalAlignment="Center">
                                            <TextBlock Text="{Binding DataPoint.Value}" FontSize="14" FontFamily="Segoe UI" Foreground="White" HorizontalAlignment="Center" VerticalAlignment="Center"/>
                                        </Border>
                                        <Path HorizontalAlignment="Center" VerticalAlignment="Center" Height="6" Width="14" Stretch="Fill" Opacity="1" Data="M 25,22 C25,22 39,22 39,22 39,22 32,28 32,28 32,28 25,22 25,22 z" Fill="#666666" Margin="0,2,0,0"/>
                                    </StackPanel>
                                </DataTemplate>
                            </chartView:AreaSeries.TrackBallInfoTemplate>
                        </chartView:AreaSeries>
                        <chart:RadCartesianChart.HorizontalAxis>
                            <chartView:DateTimeContinuousAxis MajorStepUnit="Month"
                                                          MajorStep="3"
                                                LabelFormat="yyyy年MM月dd日"
                                                LabelInterval="1" FontFamily="Segoe UI"
                                                PlotMode="OnTicks" />
                        </chart:RadCartesianChart.HorizontalAxis>
                        <chart:RadCartesianChart.VerticalAxis>
                            <chartView:LinearAxis Minimum="-3000"
                                    MajorStep="1000"
                                    Maximum="3000" FontFamily="Segoe UI" MajorTickStyle="{StaticResource tickStyle}" LabelStyle="{StaticResource yLableStyle}">
                            </chartView:LinearAxis>
                        </chart:RadCartesianChart.VerticalAxis>
                        <chart:RadCartesianChart.Grid>
                            <chartView:CartesianChartGrid MajorLinesVisibility="X" MajorXLineDashArray="7,3" StripLinesVisibility="Y">
                                <chartView:CartesianChartGrid.MajorXLineStyle>
                                    <Style TargetType="{x:Type Line}">
                                        <Setter Property="Stroke" Value="#CCCCCC"/>
                                    </Style>
                                </chartView:CartesianChartGrid.MajorXLineStyle>
                                <chartView:CartesianChartGrid.YStripeBrushes>
                                    <SolidColorBrush Color="Transparent" />
                                    <SolidColorBrush Color="#EDEDED" Opacity="0.5" />
                                </chartView:CartesianChartGrid.YStripeBrushes>
                            </chartView:CartesianChartGrid>
                        </chart:RadCartesianChart.Grid>
                    </chart:RadCartesianChart>

[Petar Marchev]

Unfortunately there is no such a feature in our charting solutions. If you are using a DateTimecontinuousAxis you can work around this by using an extra series. The first series will show the positive data and the second will show the negative data. This however requires splitting the original data and inserting extra items. Also in order not to show the point marks for the extra items you need to use a template selector.

I have attached simple project to demonstrate this. The code I have provided is for guiding purposes and you need to update it as needed.

Regards,
Petar Marchev
Telerik

[H]

It's A Very Good Advice.Thank You Very Much!