IMapVisualNumericProperty.DataAdapter

Syntax

DataAdapter: Object;

Description

The DataAdapter property determines a data source that determines the parameter construction.

Example

Executing the example requires a form with the following components: the Button component named Button1, the MapBox component named MapBox1, and the UiMap component named UiMap1. UiMap1 is a data source for MapBox1. A map should be connected to the UiMap1 component. The VisualDataAdapter class that creates a dynamic data source should also be implemented. The class example is contained in the IMapVisual.DataAdapter property description.

The example is a handler of the OnClick event for the Button1 component.

Add links to the Drawing, ExtCtrls, Forms, and Map system assemblies.

Sub Button1OnClick(Sender: Object; Args: IMouseEventArgs);
Var
    Map: IMap;
    Layer: IMapLayer;
    BarVisual: IMapBarVisual;
    Height: IMapVisualNumericProperty;
    Scale: IMapNumericScale;
Begin
    Map := UiMap1.Map;
    Layer := Map.Layers.FindByName("Regions");
    BarVisual := Layer.Visuals.AddBarVisual;
    BarVisual.DataAdapter := New VisualDataAdapter.Create As IMapDynamicDataAdapter;
    Height := BarVisual.Height;
    Height.DataAdapter := BarVisual.DataAdapter;
    Height.Dependent := True;
    Scale := New DxMapNumericScale.Create As IMapNumericScale;
    Scale.Count := 1;
    Scale.Value(0) := 50;
    Scale.Greater(0) := 2;
    Scale.Less(0) := 6;
    Height.Scale := Scale;
End Sub Button1OnClick;

After executing the example the bar indicator, which height is determined using the scale, is added to the Regions layer. The data source, that determines the construction, matches with the indicator data source.

See also:

IMapVisualNumericProperty