HeatmapPoint Class

A particular heatmap point.

Namespace: DevExpress.XtraMap

Assembly: DevExpress.XtraMap.v24.2.dll

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 create a heatmap layer for the Map Control.

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

C#

using DevExpress.XtraMap;
using System;
using System.Collections.Generic;
using System.Data;
using System.Drawing;
using System.Windows.Forms;

namespace HeatMapSample {
    public partial class Form1 : Form {
        public Form1() {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e) {

            ChoroplethColorizer colorizer = new ChoroplethColorizer();
            colorizer.RangeStops.AddRange(new double[] { 0.1, 0.2, 0.7, 1 });
            colorizer.ColorItems.Add(new ColorizerColorItem(Color.FromArgb(50, 128, 255, 0)));
            colorizer.ColorItems.Add(new ColorizerColorItem(Color.FromArgb(255, 255, 255, 0)));
            colorizer.ColorItems.Add(new ColorizerColorItem(Color.FromArgb(255, 234, 72, 58)));
            colorizer.ColorItems.Add(new ColorizerColorItem(Color.FromArgb(255, 162, 36, 25)));
            colorizer.ApproximateColors = true;

            HeatmapPointStorage pointStorage = new HeatmapPointStorage();
            pointStorage.Points.AddRange(new List<HeatmapPoint> {
                new HeatmapPoint(new GeoPoint(23.5309, -0.4211), 1),
                new HeatmapPoint(new GeoPoint(32.3248, 21.0537), 0.5),
                new HeatmapPoint(new GeoPoint(14.1503, 16.3626), 1),
                new HeatmapPoint(new GeoPoint(7.2144,  34.2711), 1),
                new HeatmapPoint(new GeoPoint(-4.5456, 10.1143), 0.5)
            });

            HeatmapProvider provider = new HeatmapProvider();
            provider.PointSource = pointStorage;
            provider.Algorithm = new HeatmapDensityBasedAlgorithm { PointRadius = 50 };
            provider.Colorizer = colorizer;

            ImageLayer heatmapLayer = new ImageLayer();
            heatmapLayer.DataProvider = provider;
            mapControl1.Layers.Add(heatmapLayer);
        }
    }
}

VB.NET

Imports DevExpress.XtraMap
Imports System
Imports System.Collections.Generic
Imports System.Data
Imports System.Drawing
Imports System.Windows.Forms

Namespace HeatMapSample
    Public Partial Class Form1
        Inherits Form

        Public Sub New()
            InitializeComponent()
        End Sub

        Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
            Dim colorizer As ChoroplethColorizer = New ChoroplethColorizer()
            colorizer.RangeStops.AddRange(New Double() {0.1, 0.2, 0.7, 1})
            colorizer.ColorItems.Add(New ColorizerColorItem(Color.FromArgb(50, 128, 255, 0)))
            colorizer.ColorItems.Add(New ColorizerColorItem(Color.FromArgb(255, 255, 255, 0)))
            colorizer.ColorItems.Add(New ColorizerColorItem(Color.FromArgb(255, 234, 72, 58)))
            colorizer.ColorItems.Add(New ColorizerColorItem(Color.FromArgb(255, 162, 36, 25)))
            colorizer.ApproximateColors = True
            Dim pointStorage As HeatmapPointStorage = New HeatmapPointStorage()
            pointStorage.Points.AddRange(New List(Of HeatmapPoint) From {
                New HeatmapPoint(New GeoPoint(23.5309, -0.4211), 1),
                New HeatmapPoint(New GeoPoint(32.3248, 21.0537), 0.5),
                New HeatmapPoint(New GeoPoint(14.1503, 16.3626), 1),
                New HeatmapPoint(New GeoPoint(7.2144, 34.2711), 1),
                New HeatmapPoint(New GeoPoint(-4.5456, 10.1143), 0.5)
            })
            Dim provider As HeatmapProvider = New HeatmapProvider()
            provider.PointSource = pointStorage
            provider.Algorithm = New HeatmapDensityBasedAlgorithm With {
                .PointRadius = 50
            }
            provider.Colorizer = colorizer
            Dim heatmapLayer As ImageLayer = New ImageLayer()
            heatmapLayer.DataProvider = provider
            mapControl1.Layers.Add(heatmapLayer)
        End Sub
    End Class
End Namespace

Inheritance

Object

HeatmapPoint