ChartDataSourceAdapter Class

The base class for data adapters that provide data to generate chart items.

Namespace: DevExpress.XtraMap

Assembly: DevExpress.XtraMap.v20.1.dll

Declaration

public abstract class ChartDataSourceAdapter :
    DataSourceAdapterBase,
    IMapChartDataAdapter,
    IMapDataAdapter,
    ILockableObject,
    ILegendDataProvider,
    IChartDataAdapterCore,
    IChartDataAdapter,
    IDataSourceDataAdapter,
    IDataAdapter,
    IDisposable
Public MustInherit Class ChartDataSourceAdapter
    Inherits DataSourceAdapterBase
    Implements IMapChartDataAdapter,
               IMapDataAdapter,
               ILockableObject,
               ILegendDataProvider,
               IChartDataAdapterCore,
               IChartDataAdapter,
               IDataSourceDataAdapter,
               IDataAdapter,
               IDisposable

Remarks

This class introduces the ChartDataSourceAdapter.ItemMinSize and ChartDataSourceAdapter.ItemMaxSize properties to specify the maximum and minimum sizes of adapter generated chart items. The ChartDataSourceAdapter also introduces the ChartDataSourceAdapter.MeasureRules property, that allows specifying the rules for size changes, depending on the chart item value.

Examples

The PieChartDataAdapter class is intended to automatically generate pie charts from a data source.

  1. Create the PieChartDataAdapter object, set its DataSourceAdapterBase.DataSource property and assign this data adapter to the VectorItemsLayer.Data property.

  2. Specify the following PieChartDataAdapter properties:

  3. Initialize the VectorItemsLayer.Colorizer property with a KeyColorColorizer object.

NOTE

The example uses a BingMapDataProvider to load image tiles. This provider requires you to set the BingMapDataProvider.BingKey property.

public Form1() {
    InitializeComponent();

    // Assign a PieChartDataAdapter object to Data.
    PieLayer.Data = CreateData();

    // Assign a KeyColorColorizer object to Colorizer.
    PieLayer.Colorizer = CreateColorizer();
}
// Create a pie chart data adapter and specify its parameters.   
IMapDataAdapter CreateData() {
    PieChartDataAdapter adapter = new PieChartDataAdapter() {
        DataSource = LoadDataFromXml(xmlFilepath),
        PieItemDataMember = "Name",
        ItemMinSize = 20,
        ItemMaxSize = 60
    };

    // Specify mappings.
    adapter.Mappings.Latitude = "CapitalLat";
    adapter.Mappings.Longitude = "CapitalLon";
    adapter.Mappings.PieSegment = "MedalClass";
    adapter.Mappings.Value = "Quantity";

    // Specify measure rules.
    adapter.MeasureRules = new MeasureRules();
    adapter.MeasureRules.RangeStops.Add(1);
    adapter.MeasureRules.RangeStops.Add(10);
    adapter.MeasureRules.RangeStops.Add(20);
    adapter.MeasureRules.RangeStops.Add(30);
    adapter.MeasureRules.RangeStops.Add(40);

    return adapter;
}
private DataTable LoadDataFromXml(string path) {
    DataSet ds = new DataSet();
    ds.ReadXml(path);
    DataTable table = ds.Tables[0];
    return table;
}
// Create a colirizer and specify its options.
MapColorizer CreateColorizer() {
    KeyColorColorizer colorizer = new KeyColorColorizer() {
        ItemKeyProvider = new ArgumentItemKeyProvider()
    };

    colorizer.Colors.Add(Color.FromArgb(255, 207, 98));
    colorizer.Colors.Add(Color.FromArgb(169, 181, 188));
    colorizer.Colors.Add(Color.FromArgb(233, 152, 118));

    colorizer.Keys.Add(new ColorizerKeyItem() { Key = 1, Name = "Gold" });
    colorizer.Keys.Add(new ColorizerKeyItem() { Key = 2, Name = "Silver" });
    colorizer.Keys.Add(new ColorizerKeyItem() { Key = 3, Name = "Bronze" });

    return colorizer;
}

Implements

See Also