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HeatmapPoint Class

A particular heatmap point.

Namespace: DevExpress.XtraMap

Assembly: DevExpress.XtraMap.v20.1.dll

Declaration

public class HeatmapPoint :
    IHeatmapPoint
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.

Examples

This example shows how to create a heatmap layer for the Map Control.

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);
        }
    }
}

Inheritance

Object
HeatmapPoint
See Also