LogarithmicRangeDistribution Class

Represents the logarithmic distribution of color ranges in a colorizer.

Assembly: DevExpress.Xpf.Map.v18.2.dll

Declaration

C#
VB.NET

public class LogarithmicRangeDistribution :
    EquationRangeDistribution

Public Class LogarithmicRangeDistribution
    Inherits EquationRangeDistribution

Example

This example demonstrates how to customize a Choropleth colorizer’s range distribution.

It is possible using one of the following range distributions.

LinearRangeDistribution;
LogarithmicRangeDistribution;
ExponentialRangeDistribution.

To use one of them, assign a required distribution to the ChoroplethColorizer.RangeDistribution property. Note that the ChoroplethColorizer.ApproximateColors property should be set to true.

Note

A complete sample project is available at https://github.com/DevExpress-Examples/how-to-customize-a-choropleth-colorizers-range-distribution-t199939.

MainWindow.xaml

<Window x:Class="RangeDistributions.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:dxlc="http://schemas.devexpress.com/winfx/2008/xaml/layoutcontrol" 
        xmlns:dxe="http://schemas.devexpress.com/winfx/2008/xaml/editors" 
        xmlns:dxm="http://schemas.devexpress.com/winfx/2008/xaml/map" 
        Title="MainWindow" Height="600" Width="800">
    <Grid>

        <dxlc:LayoutControl>
            <dxlc:LayoutGroup Orientation="Vertical">
                <dxlc:LayoutGroup>
                    <dxlc:LayoutItem Label="Range Distribution" AddColonToLabel="True">
                        <dxe:ComboBoxEdit x:Name="rangeDistribution" SelectedIndexChanged="rangeDistribution_SelectedIndexChanged">
                            <dxm:LinearRangeDistribution x:Name="linear"/>
                            <dxm:LogarithmicRangeDistribution x:Name="logarithmic"/>
                            <dxm:ExponentialRangeDistribution x:Name="exponential"/>
                        </dxe:ComboBoxEdit>
                    </dxlc:LayoutItem>
                    <dxlc:LayoutItem Label="Factor Value" AddColonToLabel="True">
                        <dxe:SpinEdit x:Name="seFactor" EditValueChanged="factor_EditValueChanged" MaxValue="100" MinValue="0" Increment="0.1"/>
                    </dxlc:LayoutItem>
                </dxlc:LayoutGroup>
                <dxlc:LayoutItem HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
                    <dxm:MapControl>
                        <dxm:VectorLayer ToolTipPattern="{}{NAME}: ${GDP_MD_EST}" ToolTipEnabled="True">
                            <dxm:ShapefileDataAdapter FileUri="/Data/Countries.shp"/>
                            <dxm:VectorLayer.Colorizer>
                                <dxm:ChoroplethColorizer x:Name="colorizer" RangeDistribution="{Binding SelectedItem, ElementName=rangeDistribution}" ApproximateColors="True" 
                                                         RangeStops="0 3000 10000 18000 28000 44000 82000 185000 1000000 2500000 15000000">
                                    <dxm:ChoroplethColorizer.ValueProvider>
                                        <dxm:ShapeAttributeValueProvider AttributeName="GDP_MD_EST"/>
                                    </dxm:ChoroplethColorizer.ValueProvider>
                                    <dxm:ChoroplethColorizer.Colors>
                                        <Color>#5F8B95</Color>
                                        <Color>#799689</Color>
                                        <Color>#A2A875</Color>
                                        <Color>#CEBB5F</Color>
                                        <Color>#F2CB4E</Color>
                                        <Color>#F1C149</Color>
                                        <Color>#E5A84D</Color>
                                        <Color>#D6864E</Color>
                                        <Color>#C56450</Color>
                                        <Color>#BA4D51</Color>
                                    </dxm:ChoroplethColorizer.Colors>
                                </dxm:ChoroplethColorizer>
                            </dxm:VectorLayer.Colorizer>
                        </dxm:VectorLayer>
                    </dxm:MapControl>
                </dxlc:LayoutItem>
                <dxlc:LayoutItem>
                    <Label Content="{Binding Value, ElementName=factor}"/>
                </dxlc:LayoutItem>
            </dxlc:LayoutGroup>
        </dxlc:LayoutControl>

    </Grid>
</Window>

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the LogarithmicRangeDistribution class.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

how-to-customize-a-choropleth-colorizers-range-distribution-t199939/CS/RangeDistributions/MainWindow.xaml#L16

<dxm:LinearRangeDistribution x:Name="linear"/>
<dxm:LogarithmicRangeDistribution x:Name="logarithmic"/>
<dxm:ExponentialRangeDistribution x:Name="exponential"/>