LogarithmicConverter Class

Description

The class WPF.LogarithmicConverter converts a numeric value from a linear scale to a logarithmic scale. It can be used to provide better usability when mapping a zoom factor to a slider, for example. The range of values of the linear as well as the logarithmic scale have to be defined with the given "Minimum"- and "Maximum"-properties. Provides a possibility to define an input value which should be mapped to the center of the output range of values. The class can be used in XAML as a static resource to automatically convert bound property values.

Syntax

public class LogarithmicConverter : IValueConverter

Public Class LogarithmicConverter
    Implements IValueConverter

Examples

The following XAML example shows how to bind the TextControl.ZoomFactor property to a slider using the LogarithmicConverter mapping a zoom range from 10 to 400 percent to a value range from 0 to 100.

…
xmlns:tx="clr-namespace:TXTextControl.WPF;assembly=TXTextControl.WPF"
…
<Window.Resources>
    <tx:LogarithmicConverter
        x:Key="logConv"
        InputMinimum="10"
        InputCenter="100"
        InputMaximum="400"
        OutputMinimum="0"
        OutputMaximum="100" />
</Window.Resources>
…
<Slider
    Minimum="0"
    Maximum="100"
    Value="{Binding ElementName=textControl1, Path=ZoomFactor, Converter={StaticResource logConv}}" />

The following example creates a Logarithmic Converter instance and configures its input minimum setting for a document workflow.

TXTextControl.WPF.LogarithmicConverter logarithmicConverter = new();
logarithmicConverter.InputMinimum = 1.0;

Dim logarithmicConverter As New TXTextControl.WPF.LogarithmicConverter()
logarithmicConverter.InputMinimum = 1.0

Members

Constructors

Properties

Methods