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Label format for Zero (0)

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Tauqir
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Tauqir asked on 16 Jan 2014, 10:12 AM
I am using the following code to format the scale. 

<
telerik:RadialScale Min="0" Max="55000" Multiplier=".001" IsInteractive="True" MajorTickStep="5000" LabelLocation="OverInside" FontSize="11" LabelOffset="-25" LabelRotationMode="None" StartAngle="160" SweepAngle="220" LabelFormat="{}{0:F0}k">

Using a multiplier and a label format, I'm displaying values such as 5K, 10K, etc. instead of 5000, 10000, etc.
However, my first value shows up as '0K', while I would like just '0' (zero) to be shown.
How  can I achieve this? Thanks.

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Andrey
Telerik team
answered on 20 Jan 2014, 04:13 PM
Hello Tauqir,

You can specify the custom data template for labels via the RadialScale.LabelTemplate property. And then you can bind the text of each label in the template using a custom converter which will change the text for the 'zero' label.

The sample code is below.

<Window x:Class="CustomFirstLabel.MainWindow"
        xmlns:local="clr-namespace:CustomFirstLabel"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <local:CustomLabelConverter x:Key="CustomLabelConverter" />
    </Window.Resources>
    <Grid>
        <telerik:RadialScale Min="0" Max="55000" Multiplier=".001" IsInteractive="True" MajorTickStep="5000"
                             LabelLocation="OverInside" FontSize="11" LabelOffset="-25" LabelRotationMode="None"
                             StartAngle="160" SweepAngle="220" LabelFormat="{}{0:F0}k">
            <telerik:RadialScale.LabelTemplate>
                <DataTemplate>
                    <TextBlock HorizontalAlignment="Center"
                               VerticalAlignment="Center"
                               FontFamily="{Binding FontFamily}"
                               FontSize="{Binding FontSize}"
                               FontStretch="{Binding FontStretch}"
                               FontStyle="{Binding FontStyle}"
                               FontWeight="{Binding FontWeight}"
                               Foreground="{Binding Foreground}"
                               Text="{Binding Path=FormattedValue, Converter={StaticResource CustomLabelConverter}}" />
                </DataTemplate>
            </telerik:RadialScale.LabelTemplate>
        </telerik:RadialScale>
    </Grid>
</Window>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Data;
 
namespace CustomFirstLabel
{
    public class CustomLabelConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            string formattedValue = (string)value;
            if (formattedValue.StartsWith("0"))
            {
                return "0";
            }
 
            return value;
        }
 
        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}

Give it a try and let me know if it helps.

Regards,
Andrey Murzov
Telerik
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Tauqir
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answered on 19 Mar 2014, 03:07 PM
Thanks, that worked perfectly.
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