ChoroplethColorizer Class

Represents the Choropleth-like colorizer.

Assembly: DevExpress.Xpf.Map.v19.1.dll

Declaration

C#
VB.NET

public class ChoroplethColorizer :
    MapColorizer,
    IWeakEventListener,
    ILegendDataProvider

Public Class ChoroplethColorizer
    Inherits MapColorizer
    Implements IWeakEventListener,
               ILegendDataProvider

Example

This example demonstrates how to paint each map contour in a specific color, based on population data from the Shapefile.

To do this, create a colorizer and assign it to the VectorLayer.Colorizer property.

To access GDP information from Shapefiles, assign a ShapeAttributeValueProvider object with the specified attribute name (NamedAttributeProviderBase.AttributeName) to the ChoroplethColorizer.ValueProvider property.

Then, specify range stops (data splits in ranges) for the colorizer using the ChoroplethColorizer.RangeStops property.

Finally, add the desired set of colors to the ColorCollection object that is accessed using the MapColorizer.Colors property. The colorizer automatically associates each color with the specified data range to colorize map shapes.

Note

A complete sample project is available at https://github.com/DevExpress-Examples/how-to-colorize-map-contours-loaded-from-shapefiles-using-the-choropleth-colorizer-e4587.

MainWindow.xaml

<dxm:VectorLayer.Colorizer>
    <dxm:ChoroplethColorizer 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>

The following code snippets (auto-collected from DevExpress Examples) contain references to the ChoroplethColorizer 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#L29

<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">

how-to-colorize-map-contours-loaded-from-shapefiles-using-the-choropleth-colorizer-e4587/VB/Wpf_MapControl_ChoroplethColorizer/MainWindow.xaml#L12

<dxm:VectorLayer.Colorizer>
    <dxm:ChoroplethColorizer RangeStops="0 3000 10000 18000 28000 44000 82000 185000 1000000 2500000 15000000">
        <dxm:ChoroplethColorizer.ValueProvider>

mapcontrol-getting-started-lesson-2-load-a-vector-map-t190755/VB/MapControl_Lesson2/MainWindow.xaml#L19

<dxm:VectorLayer.Colorizer>
    <dxm:ChoroplethColorizer RangeStops="0 3000 10000 18000 28000 44000 82000 185000 1000000 2500000 15000000">
        <dxm:ChoroplethColorizer.ValueProvider>