HeatmapPaletteColorProvider.Palette Property

Gets or sets the color provider palette.

Namespace: DevExpress.XtraCharts.Heatmap

Assembly: DevExpress.XtraCharts.v21.2.dll

NuGet Package: DevExpress.Charts

Declaration

C#

[Browsable(false)]
public Palette Palette { get; set; }

VB.NET

<Browsable(False)>
Public Property Palette As Palette

Property Value

Type	Description
Palette	Specifies the color provider palette.

Remarks

You can use one of the predefined palettes to specify the Palette property:

C#

colorProvider.Palette = Palettes.Slipstream;

VB.NET

colorProvider.Palette = Palettes.Slipstream

It is possible to create a custom palette as follows:

C#

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

VB.NET

colorProvider.Palette = New Palette("Custom") From {
            Color.White,
            Color.SkyBlue,
            Color.DarkBlue
        }

Alternatively, you can use the PaletteName property to specify the palette.

Example

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

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

C#

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}";
        }
    }
}

VB.NET

Imports DevExpress.XtraCharts
Imports DevExpress.XtraCharts.Heatmap
Imports System.Drawing
Imports System.Windows.Forms

Namespace HeatmapMatrixData

    Public Partial Class Form1
        Inherits System.Windows.Forms.Form

        Public Sub New()
            Me.InitializeComponent()
            Dim dataAdapter As HeatmapMatrixAdapter = 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}}
            Me.heatmap.DataAdapter = dataAdapter
            Dim palette As Palette = New Palette("Custom") From {System.Drawing.Color.White, System.Drawing.Color.SkyBlue, System.Drawing.Color.DarkBlue}
            Dim colorProvider As HeatmapRangeColorProvider = New HeatmapRangeColorProvider() With {.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))
            Me.heatmap.ColorProvider = colorProvider
            Me.heatmap.Titles.Add(New HeatmapTitle With {.Text = "Sales by Categories"})
            Me.heatmap.Label.Visible = True
            Me.heatmap.Label.Pattern = "{V}"
        End Sub
    End Class
End Namespace