DataAdapter: Object;
The DataAdapter property determines a data source that determines the fill.
Executing the example requires a form, a button named Button1 on the form, the UiMap component named UiMap1 that is a data source for the MapBox component. The map must be connected to the UiMap1 component. The VisualDataAdapter class, that creates a dynamic data source, must also be implemented. The class example is contained in the IMapVisual.DataAdapter property description.
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.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: