All docs
V21.2
21.2
21.1
The page you are viewing does not exist in version 21.1. This link will take you to the root page.
20.2
The page you are viewing does not exist in version 20.2. This link will take you to the root page.
20.1
The page you are viewing does not exist in version 20.1. This link will take you to the root page.
19.2
The page you are viewing does not exist in version 19.2. This link will take you to the root page.
19.1
The page you are viewing does not exist in version 19.1. This link will take you to the root page.
18.2
The page you are viewing does not exist in version 18.2. This link will take you to the root page.
18.1
The page you are viewing does not exist in version 18.1. This link will take you to the root page.
17.2
The page you are viewing does not exist in version 17.2. This link will take you to the root page.

HeatmapDataSourceAdapter Class

Loads heatmap data from a data source.

Namespace: DevExpress.Xpf.Charts.Heatmap

Assembly: DevExpress.Xpf.Charts.v21.2.dll

Declaration

public class HeatmapDataSourceAdapter :
    HeatmapDataAdapterBase,
    IHeatmapDataSourceProvider,
    IHeatmapAdapter

Remarks

Use the HeatmapControl.DataAdapter to assign a HeatmapDataSourceAdapter to a heatmap. Specify the following adapter properties to load data to the heatmap:

Example

The following example shows how to create a heatmap and bind it to a data source. In this example, the heatmap obtains data from an XML file.

A heatmap that uses a Data Source Adapter to load data.

  1. Add the HeatmapControl to the project.

  2. Create a HeatmapDataSourceAdapter object and assign it to the HeatmapControl.DataAdapter property.

  3. Define the adapter’s DataSource property.

  4. Use the ColorDataMember property to define a data member that is used to determine cell colors.

  5. Specify the following adapter properties to define data members that store heatmap arguments:

  6. Create a HeatmapRangeColorProvider object and assign it to the HeatmapControl.ColorProvider property. The Range Color Provider paints cells based on a value range to which the cell value belongs.

  7. To display cell labels, initialize the HeatmapControl.Label property with a HeatmapLabel object.

  8. Set the HeatmapControl.Legend property to a HeatmapLegend object to add a legend to the heatmap.

  9. Set the HeatmapControl.ToolTipEnabled property to true to enable tooltips. Specify the HeatmapToolTipOptions.Pattern property to define tooltip text display format.

  10. Use the HeatmapControl.AxisX and HeatmapControl.AxisY properties to customize heatmap axes.

    In this example, the x-axis AutoGrid property is disabled and GridSpacing is set to 1 to display all axis labels (without gaps). The Angle property defines axis label rotation to avoid overlapped labels.

View Example

<dx:ThemedWindow
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core"
    xmlns:dxh="http://schemas.devexpress.com/winfx/2008/xaml/heatmap" 
    xmlns:dxc="http://schemas.devexpress.com/winfx/2008/xaml/charts"
    x:Class="HeatmapDataSource.MainWindow"
    Title="MainWindow" Height="500" Width="800">
    <Grid>
        <dxh:HeatmapControl ToolTipEnabled="True">
            <dxh:HeatmapControl.ToolTipOptions>
                <dxh:HeatmapToolTipOptions Pattern="X: {X}&#x0a;Y: {Y}" />
            </dxh:HeatmapControl.ToolTipOptions>
            <dxh:HeatmapControl.DataAdapter>
                <dxh:HeatmapDataSourceAdapter
                    DataSource="{Binding}"
                    XArgumentDataMember="Country"
                    YArgumentDataMember="Product"
                    ColorDataMember="Value"/>
            </dxh:HeatmapControl.DataAdapter>
            <dxh:HeatmapControl.ColorProvider>
                <dxh:HeatmapRangeColorProvider ApproximateColors="true" 
                                               LegendItemPattern="{}{VP1:0%} - {VP2:0%}">
                    <dxh:HeatmapRangeColorProvider.Palette>
                        <dxc:CustomPalette>
                            <dxc:CustomPalette.Colors>
                                <Color>Red</Color>
                                <Color>White</Color>
                                <Color>Green</Color>
                            </dxc:CustomPalette.Colors>
                        </dxc:CustomPalette>
                    </dxh:HeatmapRangeColorProvider.Palette>
                    <dxh:HeatmapRangeColorProvider.RangeStops>
                        <dxh:HeatmapRangeStop Value="0" Type="Percentage"/>
                        <dxh:HeatmapRangeStop Value="-10"/>
                        <dxh:HeatmapRangeStop Value="-2.5"/>
                        <dxh:HeatmapRangeStop Value="0"/>
                        <dxh:HeatmapRangeStop Value="2.5"/>
                        <dxh:HeatmapRangeStop Value="10"/>
                        <dxh:HeatmapRangeStop Value="1" Type="Percentage"/>
                    </dxh:HeatmapRangeColorProvider.RangeStops>
                </dxh:HeatmapRangeColorProvider>
            </dxh:HeatmapControl.ColorProvider>
            <dxh:HeatmapControl.Label>
                <dxh:HeatmapLabel FontSize="8"/>
            </dxh:HeatmapControl.Label>
            <dxh:HeatmapControl.Legend>
                <dxh:HeatmapLegend/>
            </dxh:HeatmapControl.Legend>
            <dxh:HeatmapControl.AxisX>
                <dxh:HeatmapAxis AutoGrid="False" 
                                 GridSpacing="1">
                    <dxh:HeatmapAxis.Label>
                        <dxc:AxisLabel Angle="30"/>
                    </dxh:HeatmapAxis.Label>
                </dxh:HeatmapAxis>
            </dxh:HeatmapControl.AxisX>
            <dxh:HeatmapControl.AxisY>
                <dxh:HeatmapAxis/>
            </dxh:HeatmapControl.AxisY>
        </dxh:HeatmapControl>
    </Grid>
</dx:ThemedWindow>
using DevExpress.Xpf.Core;
using System;
using System.Data;
using System.IO;
using System.Windows;
using System.Xml;
using System.Xml.Linq;

namespace HeatmapDataSource {

    public partial class MainWindow : ThemedWindow {
        public MainWindow() {
            InitializeComponent();
            DataContext = DataLoader.CreateDataSet("/Data/BalanceOfTrade.xml");
        }
    }
    public static class DataLoader {
        static Stream GetStream(string fileName) {
            Uri uri = new Uri(fileName, UriKind.RelativeOrAbsolute);
            return Application.GetResourceStream(uri).Stream;
        }
        public static XDocument LoadXDocumentFromResources(string fileName) {
            try {
                return XDocument.Load(GetStream(fileName));
            } catch {
                return null;
            }
        }
        public static XmlDocument LoadXmlDocumentFromResources(string fileName) {
            XmlDocument document = new XmlDocument();
            try {
                document.Load(GetStream(fileName));
                return document;
            } catch {
                return null;
            }
        }
        public static DataTable CreateDataSet(string fileName) {
            if (!string.IsNullOrWhiteSpace(fileName)) {
                DataSet dataSet = new DataSet();
                dataSet.ReadXml(GetStream(fileName));
                if (dataSet.Tables.Count > 0)
                    return dataSet.Tables[0];
            }
            return null;
        }
    }
}

The XML file structure looks as follows:

Show XML
<?xml version="1.0" standalone="yes"?>
<BalanceOfTrade xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:element name="Item">
      <xs:complexType>
        <xs:sequence>
          <xs:element name="Country" type="xs:string"/>
          <xs:element name="Product" type="xs:string"/>
          <xs:element name="Value" type="xs:double"/>
        </xs:sequence>
      </xs:complexType>
    </xs:element>
  </xs:schema>
  <Item>
    <Country>China</Country>
    <Product>Computer</Product>
    <Value>-151.9</Value>
  </Item>
  <Item>
    <Country>China</Country>
    <Product>Oil, Gas, Minerals</Product>
    <Value>1.9</Value>
  </Item>
  <Item>
    <Country>China</Country>
    <Product>Transportation</Product>
    <Value>10.9</Value>
  </Item>
  <Item>
    <Country>China</Country>
    <Product>Apparel</Product>
    <Value>-56.3</Value>
  </Item>
  <!--...-->
</BalanceOfTrade>     

Inheritance

Object
DispatcherObject
DependencyObject
Freezable
DevExpress.Xpf.Charts.Heatmap.Native.NotificationElement
HeatmapDataAdapterBase
HeatmapDataSourceAdapter
See Also