DataAdapter: Object;
The DataAdapter property determines a data source that determines the fill.
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;
AreaVisual: IMapAreaVisual;
Color: IMapVisualColorProperty;
StartC, EndC: IGxColor;
Scale: IMapColorScale;
Begin
Map := UiMap1.Map;
Layer := Map.Layers.FindByName("Regions");
AreaVisual := Layer.Visuals.AddAreaVisual;
AreaVisual.DataAdapter := New VisualDataAdapter.Create As IMapDynamicDataAdapter;
Color := AreaVisual.Color;
Color.Dependent := True;
Color.DataAdapter := AreaVisual.DataAdapter;
Scale := New DxMapColorScale.Create As IMapColorScale;
StartC := GxColor.FromName("Red");
EndC := GxColor.FromName("Blue");
Scale.AutoSetup(Layer, AreaVisual.DataAdapter, StartC, EndC);
Color.Scale := Scale;
End Sub Button1OnClick;
After executing the example the map indicator, fill color of which is color scale determined, is added to the Regions layer. The data source, that determines the filling, matches with the indicator data source:
See also: