HeatmapPoint Class

A particular heatmap point.

Namespace: DevExpress.Xpf.Map

Assembly: DevExpress.Xpf.Map.v24.1.dll

NuGet Package: DevExpress.Wpf.Map

Declaration

C#

public class HeatmapPoint :
    IHeatmapPoint

VB.NET

Public Class HeatmapPoint
    Implements IHeatmapPoint

Remarks

Use the Location property to specify the point position. To set the point’s weight value, use the Value property.

Example

This example shows how to use a HeatmapPointStorage object to create a heatmap layer.

• Create an ImageLayer object and add it to the MapControl.Layers collection.
• Assign a HeatmapProvider object to the ImageLayer.DataProvider property.
• Use a HeatmapPointStorage object to initialize the PointSource property.

Markup:

XAML

<dxm:MapControl>
    <dxm:ImageLayer>
        <dxm:HeatmapProvider>
            <dxm:HeatmapProvider.PointSource>
                <dxm:HeatmapPointStorage x:Name="storage"/>
            </dxm:HeatmapProvider.PointSource>
            <dxm:HeatmapProvider.Algorithm>
                <dxm:HeatmapDensityBasedAlgorithm PointRadius="50"/>
            </dxm:HeatmapProvider.Algorithm>
            <dxm:HeatmapProvider.Colorizer>
                <dxm:ChoroplethColorizer RangeStops="0.1, 0.2, 0.7, 1.0" 
                                         ApproximateColors="True">
                    <dxm:ChoroplethColorizer.Colors>
                        <Color A="50"  R="128"  G="255"  B="0"/>
                        <Color A="255" R="255"  G="255"  B="0"/>
                        <Color A="255" R="234"  G="72"   B="58"/>
                        <Color A="255" R="162"  G="36"   B="25"/>
                    </dxm:ChoroplethColorizer.Colors>
                </dxm:ChoroplethColorizer>
            </dxm:HeatmapProvider.Colorizer>
        </dxm:HeatmapProvider>
    </dxm:ImageLayer>
</dxm:MapControl>

Code-Behind:

C#

using System.Windows;
using DevExpress.Xpf.Map;
namespace HeatmapPointStorage {
    public partial class MainWindow : Window {
        public MainWindow() {
            InitializeComponent();
            storage.Points.Add(new HeatmapPoint(new GeoPoint(23.5309, -0.4211), 1));
            storage.Points.Add(new HeatmapPoint(new GeoPoint(32.3248, 21.0537), 0.5));
            storage.Points.Add(new HeatmapPoint(new GeoPoint(14.1503, 16.3626), 1));
            storage.Points.Add(new HeatmapPoint(new GeoPoint(7.2144, 34.2711), 1));
            storage.Points.Add(new HeatmapPoint(new GeoPoint(-4.5456, 10.1143), 0.5));
        }
    }
}

VB.NET

Imports System.Windows
Imports DevExpress.Xpf.Map
Namespace HeatmapPointStorage
    Public Partial Class MainWindow
        Inherits Window
        Public Sub New()
            InitializeComponent()
            storage.Points.Add(New HeatmapPoint(New GeoPoint(23.5309, -0.4211), 1))
            storage.Points.Add(New HeatmapPoint(New GeoPoint(32.3248, 21.0537), 0.5))
            storage.Points.Add(New HeatmapPoint(New GeoPoint(14.1503, 16.3626), 1))
            storage.Points.Add(New HeatmapPoint(New GeoPoint(7.2144, 34.2711), 1))
            storage.Points.Add(New HeatmapPoint(New GeoPoint(-4.5456, 10.1143), 0.5))
        End Sub
    End Class
End Namespace

You can also create heatmap points in XAML:

XAML

<dxm:HeatmapProvider.PointSource>
    <dxm:HeatmapPointStorage>
        <dxm:HeatmapPointStorage.Points>
            <dxm:HeatmapPoint Value="0.5">
                <dxm:HeatmapPoint.Location>
                    <dxm:GeoPoint Latitude="32.3248" Longitude="21.0537"/>
                </dxm:HeatmapPoint.Location>
            </dxm:HeatmapPoint>
            <!-- Other heatmap points. -->
        </dxm:HeatmapPointStorage.Points>
    </dxm:HeatmapPointStorage>
</dxm:HeatmapProvider.PointSource>

Inheritance

Object

HeatmapPoint