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V25.1
  • DevExpress v25.1 Update — Your Feedback Matters

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    HeatmapPoint Class

    A particular heatmap point.

    Namespace: DevExpress.XtraMap

    Assembly: DevExpress.XtraMap.v25.1.dll

    NuGet Package: DevExpress.Win.Map

    #Declaration

    public class HeatmapPoint :
        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.

    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