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V24.1

HeatmapRangeColorProvider.RangeStops Property

Returns the collection of color ranges for the heatmap range color provider.

Namespace: DevExpress.XtraCharts.Heatmap

Assembly: DevExpress.XtraCharts.v24.1.dll

NuGet Package: DevExpress.Charts

Declaration

[XtraSerializableProperty(XtraSerializationVisibility.SimpleCollection)]
public HeatmapRangeStopCollection RangeStops { get; }

Property Value

Type Description
HeatmapRangeStopCollection

A collection of color range boundaries.

Remarks

The RangeStops property allows you to specify color ranges. To do this, populate the RangeStops collection with HeatmapRangeStop objects. Specify the Value property for each range stop to define a color boundary. Set a range stop’s Type property to Percentage to define color ranges as percentages (in the [0..1] range). This can be helpful if the range of possible values is unknown.

Example

This example shows how to use arrays of string and numeric values to create a heatmap:

A heatmap that uses a Matrix Adapter

Follow the steps below to create a heatmap:

  1. Add the HeatmapControl to the Form.
  2. Create a HeatmapMatrixAdapter object and assign it to the HeatmapControl.DataAdapter property.
  3. Use the adapter’s XArguments and YArguments properties to populate the heatmap with x- and y-arguments that are displayed along x- and y-axes.
  4. Assign a two-dimensional array of double values to the adapter’s Values property.
  5. Create a HeatmapRangeColorProvider object and assign it to the heatmap’s ColorProvider property. The HeatmapRangeColorProvider paints cells based on the value range to which the cell value belongs.
  6. Add a HeatmapTitle to the heatmap’s Titles collection. Specify the title’s Text property.
  7. Use the heatmap’s Label property to configure cell label options. This example shows how to configure label text format.

View Example

using DevExpress.XtraCharts;
using DevExpress.XtraCharts.Heatmap;
using System.Drawing;
using System.Windows.Forms;

namespace HeatmapMatrixData {
    public partial class Form1 : Form {
        public Form1() {
            InitializeComponent();

            HeatmapMatrixAdapter dataAdapter = new HeatmapMatrixAdapter();
            dataAdapter.XArguments = new string[] { "North", "South", "West", "East", "Central" };
            dataAdapter.YArguments = new string[] { "Components", "Clothing", "Bikes", "Accessories" };
            dataAdapter.Values = new double[,] {
                { 21.3, 50.1, 63.2, 64.4, 33.4 },
                { 32.3, 54.4, 81.3, 53.4, 54.9 },
                { 60.3, 49.1, 42.6, 48.4, 65.4 },
                { 45.3, 54.7, 70.3, 66.4, 56.6 }
            };
            heatmap.DataAdapter = dataAdapter;

            Palette palette = new Palette("Custom") {
                Color.White,
                Color.SkyBlue,
                Color.DarkBlue
            };

            HeatmapRangeColorProvider colorProvider = new HeatmapRangeColorProvider() {
                Palette = palette,
                ApproximateColors = true
            };
            colorProvider.RangeStops.Add(new HeatmapRangeStop(0, HeatmapRangeStopType.Percentage));
            colorProvider.RangeStops.Add(new HeatmapRangeStop(20, HeatmapRangeStopType.Absolute));
            colorProvider.RangeStops.Add(new HeatmapRangeStop(40, HeatmapRangeStopType.Absolute));
            colorProvider.RangeStops.Add(new HeatmapRangeStop(60, HeatmapRangeStopType.Absolute));
            colorProvider.RangeStops.Add(new HeatmapRangeStop(90, HeatmapRangeStopType.Absolute));
            colorProvider.RangeStops.Add(new HeatmapRangeStop(1, HeatmapRangeStopType.Percentage));

            heatmap.ColorProvider = colorProvider;

            heatmap.Titles.Add(new HeatmapTitle { Text = "Sales by Categories" });

            heatmap.Label.Visible = true;
            heatmap.Label.Pattern = "{V}";
        }
    }
}
See Also