MeasureRules Class

Contains measure rules for vector items.

Namespace: DevExpress.XtraMap

Assembly: DevExpress.XtraMap.v18.1.dll

Declaration

C#

public class MeasureRules :
    IOwnedElement,
    ILegendDataProvider,
    IMeasureRules

VB.NET

Public Class MeasureRules
    Implements IOwnedElement,
               ILegendDataProvider,
               IMeasureRules

Related API Members

The following members accept/return MeasureRules objects:

• ChartDataSourceAdapter.MeasureRules

Remarks

An instance of the MeasureRules class can be accessed using the ChartDataSourceAdapter.MeasureRules property.

Example

This example demonstrates how to generate bubble charts for a map control. Do the following:

• Create a VectorItemsLayer object and add it to the map control.
• Create a BubbleChartDataAdapter object and assign it to the VectorItemsLayer.Data property.
• Generate a data source with data for bubble charts and assign it to the DataSourceAdapterBase.DataSource property.
• Specify the mappings for bubble chart properties to corresponding columns in a datasource (a MapBubbleMappingInfo object that can be accessed using the BubbleChartDataAdapter.Mappings property).
• Specify the attribute mappings that are used to provide additional information about the map item to a map control.(an MapItemAttributeCollection object that can be accessed using the BubbleChartDataAdapter.Mappings property).

Note

A complete sample project is available at https://github.com/DevExpress-Examples/how-to-display-bubble-chart-items-on-a-map-t113410

Form1.cs

    // Specify data for the bubble layer.
    BubbleLayer.Data = CreateData();
private IMapDataAdapter CreateData() {
    BubbleChartDataAdapter adapter = new BubbleChartDataAdapter() {
        DataSource = LoadData(),
        MeasureRules = CreateMeasureRules(),
        ItemMaxSize = 60,
        ItemMinSize = 10
    };

    #region #Mappings
    // Map the properties of chart items to the appropriate fields in the data source.
    adapter.Mappings.Latitude = "glat";
    adapter.Mappings.Longitude = "glon";
    adapter.Mappings.Value = "mag";
    #endregion #Mappings

    // Create attribute mappings to provide additional information about map items to the map.
    adapter.AttributeMappings.Add(new MapItemAttributeMapping("Magnitude", "mag"));
    adapter.AttributeMappings.Add(new MapItemAttributeMapping("Year", "yr"));
    adapter.AttributeMappings.Add(new MapItemAttributeMapping("Month", "mon"));
    adapter.AttributeMappings.Add(new MapItemAttributeMapping("Day", "day"));
    adapter.AttributeMappings.Add(new MapItemAttributeMapping("Depth", "dep"));

    return adapter;
}

private DataTable LoadData() {
    DataSet ds = new DataSet();
    ds.ReadXml(dataPath);
    DataTable dt = ds.Tables[0];
    dt.DefaultView.RowFilter = string.Format(CultureInfo.InvariantCulture, "(mag >= {0}) AND (mag <= {1})", minMagnitude, maxMagnitude);

    return ds.Tables[0];
}

private MeasureRules CreateMeasureRules() {
    MeasureRules measureRules = new MeasureRules();

    measureRules.ApproximateValues = true;
    measureRules.RangeDistribution = new LinearRangeDistribution();

    for (int i = minMagnitude; i < maxMagnitude; i++) {
        measureRules.RangeStops.Add(i);
    }

    return measureRules;
}

Form1.vb

    ' Specify data for the bubble layer.
    BubbleLayer.Data = CreateData()
Private Function CreateData() As IMapDataAdapter
    Dim adapter As New BubbleChartDataAdapter() With {.DataSource = LoadData(), .MeasureRules = CreateMeasureRules(), .ItemMaxSize = 60, .ItemMinSize = 10}

    '            #Region "#Mappings"
    ' Map the properties of chart items to the appropriate fields in the data source.
    adapter.Mappings.Latitude = "glat"
    adapter.Mappings.Longitude = "glon"
    adapter.Mappings.Value = "mag"

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the MeasureRules class.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

how-to-display-bubble-chart-items-on-a-map-t113410/CS/MapBubbleCharts/Form1.cs#L58

private MeasureRules CreateMeasureRules() {
    MeasureRules measureRules = new MeasureRules();

how-to-use-piechartdataadapter-to-add-pie-charts-to-a-map-t141324/CS/WinForms_MapControl_PieChartDataAdapter/Form1.cs#L43

// Specify measure rules
adapter.MeasureRules = new MeasureRules();
adapter.MeasureRules.RangeStops.Add(1);

VB.NET

how-to-display-bubble-chart-items-on-a-map-t113410/VB/MapBubbleCharts/Form1.vb#L59

Private Function CreateMeasureRules() As MeasureRules
    Dim measureRules As New MeasureRules()

how-to-use-piechartdataadapter-to-add-pie-charts-to-a-map-t141324/VB/WinForms_MapControl_PieChartDataAdapter/Form1.vb#L44

' Specify measure rules
adapter.MeasureRules = New MeasureRules()
adapter.MeasureRules.RangeStops.Add(1)

Inheritance

Object

MeasureRules