ExponentialRangeDistribution Class
Represents the exponential distribution of color ranges in a colorizer.
Namespace: DevExpress.Xpf.Map
Assembly: DevExpress.Xpf.Map.v20.2.dll
NuGet Packages: DevExpress.WindowsDesktop.Wpf.Map, DevExpress.Wpf.Map
Declaration
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.
<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>
Related GitHub Examples
The following code snippet (auto-collected from DevExpress Examples) contains a reference to the ExponentialRangeDistribution 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.