ColorScheme Class
A color scheme used to color dashboard item elements.
Namespace: DevExpress.DashboardCommon
Assembly: DevExpress.Dashboard.v19.2.Core.dll
Declaration
Remarks
The dashboard provides two ways for coloring dashboard item elements.
- Using a global color scheme that provides consistent colors for identical values across the dashboard. To access the dashboard color scheme, use the Dashboard.ColorScheme property.
- Using a local color scheme that provides an individual set of colors for each dashboard item. For instance, the Chart and Pie dashboard items provide the ChartDashboardItemBase.ColorScheme property to access a local color scheme.
Dashboard items that support coloring expose the ColoringOptions property allowing you to access coloring options. The DashboardItemColoringOptions object returned by this property exposes the DashboardItemColoringOptions.UseGlobalColors property, allowing you to specify whether the dashboard item uses a global or local color scheme.
Dashboard items allow you to color specific dimension values/measures or their combinations using specified colors.
To color the required dimension values/measures, specify the coloring mode using the following properties.
- The Dimension.ColoringMode property specifies the dimension coloring mode.
- The DashboardItemColoringOptions.MeasuresColoringMode property specifies the coloring mode for dashboard item measures.
The ColorScheme class provides access to a collection of ColorSchemeEntry objects that allow you to map the required dimension values/measures and the specified color. To do this, use the following members.
- The ColorSchemeEntry.DimensionKeys collection contains ColorSchemeDimensionKey objects that allow you to specify the dimension and corresponding dimension value. Use the Dimension.GetDimensionDefinition method to obtain the dimension definition and pass the returned object to the ColorSchemeDimensionKey constructor.
- The ColorSchemeEntry.MeasureKey property returns the ColorSchemeMeasureKey object that allows you to specify measures to be colored. Use the Measure.GetMeasureDefinition method to obtain the measure definition and pass the returned object to the ColorSchemeMeasureKey constructor.
- The ColorSchemeEntry.DataSource property specifies the data source containing the required dimensions and measures.
- The ColorSchemeEntry.ColorDefinition property allows you to specify the color used to color the dimension values/measures specified above. You can select the required color from the default palette or specify a custom color.
Important
To learn more about coloring, see Coloring.
Example
The following example demonstrates how to customize a dashboard color scheme to color specified dimension values using predefined colors.
In this example, the dashboard contains Pie and Chart dashboard items, whose dimension values are colored by hue. Dimension values and corresponding colors are stored in a data table.
To add custom colors to the dashboard color scheme (the Dashboard.ColorScheme property), create the ColorSchemeEntry objects.
The ColorSchemeEntry class has the following properties:
- The ColorSchemeEntry.DataSource property specifies a data source containing dimension values.
- The ColorSchemeEntry.DimensionKeys property allows you to specify the dimension values.
- The ColorSchemeEntry.ColorDefinition property sets the color used to color the dimension values.
Note
The complete sample project How to Customize a Dashboard Color Scheme is available in the DevExpress Examples repository.
using System.Data;
using System.Drawing;
using DevExpress.XtraBars.Ribbon;
using DevExpress.DashboardCommon;
namespace Dashboard_Coloring {
public partial class Form1 : RibbonForm {
public Form1() {
InitializeComponent();
dashboardDesigner1.CreateRibbon();
// Creates a color table containing dimension values, measures and corresponding colors.
DataTable colorTable = CreateColorTable();
// Loads a dashboard from the XML file.
Dashboard dashboard = new Dashboard(); dashboard.LoadFromXml(@"..\..\Data\Dashboard.xml");
IDashboardDataSource dataSource = dashboard.DataSources["dataSource1"];
// Specifies the coloring mode for the specified pie series, pie measures and chart argument.
PieDashboardItem pie1 = (PieDashboardItem)dashboard.Items["pieDashboardItem1"];
ChartDashboardItem chart1 = (ChartDashboardItem)dashboard.Items["chartDashboardItem1"];
pie1.SeriesDimensions[0].ColoringMode = ColoringMode.Hue;
pie1.ColoringOptions.MeasuresColoringMode = ColoringMode.Hue;
chart1.Arguments[0].ColoringMode = ColoringMode.Hue;
foreach (DataRow row in colorTable.Rows) {
dashboard.ColorScheme.Add(CreateColorSchemeEntry(row, dataSource, false));
dashboard.ColorScheme.Add(CreateColorSchemeEntry(row, dataSource, true));
}
dashboardDesigner1.Dashboard = dashboard;
}
// Creates color scheme entries used to map dimension values, measures and colors.
private ColorSchemeEntry CreateColorSchemeEntry(DataRow colorSchemeRecord,
IDashboardDataSource dataSource,
bool includeMeasures) {
DimensionDefinition categoryDefinition = new DimensionDefinition("CategoryName");
DimensionDefinition countryDefinition = new DimensionDefinition("Country");
MeasureDefinition priceDefinition = new MeasureDefinition("Extended Price");
ColorSchemeEntry entry = new ColorSchemeEntry();
entry.DimensionKeys.Add(new ColorSchemeDimensionKey(categoryDefinition,
colorSchemeRecord["CategoryName"]));
entry.DimensionKeys.Add(new ColorSchemeDimensionKey(countryDefinition,
colorSchemeRecord["Country"]));
if(includeMeasures)
entry.MeasureKey = new ColorSchemeMeasureKey(priceDefinition);
entry.ColorDefinition = new ColorDefinition((Color)colorSchemeRecord["color"]);
entry.DataSource = dataSource;
return entry;
}
private DataTable CreateColorTable() {
DataTable colorTable = new DataTable();
colorTable.Columns.Add("CategoryName", typeof(string));
colorTable.Columns.Add("Country", typeof(string));
colorTable.Columns.Add("measure", typeof(string));
colorTable.Columns.Add("color", typeof(Color));
colorTable.Rows.Add("Beverages", "UK", "Extended Price", Color.Red);
colorTable.Rows.Add("Beverages", "USA", "Extended Price", Color.Green);
return colorTable;
}
}
}