IMapLayerVisuals.AddPieVisual

Syntax

AddPieVisual: IMapPieVisual;

Description

The AddPieVisual method adds a pie indicator to the collection.

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;
    PieVisual: IMapPieVisual;
    Color: IMapVisualColorProperty;
    Collection: IMapColorCollection;
Begin
    Map := UiMap1.Map;
    Layer := Map.Layers.FindByName("Regions");
    PieVisual := Layer.Visuals.AddPieVisual;
    PieVisual.DataAdapter := New VisualDataAdapter.Create As IMapDynamicDataAdapter;
    Color := PieVisual.Color;
    Color.DataAdapter := PieVisual.DataAdapter;
    Color.Dependent := False;
    Collection := Color.Values;
    Collection.Count := 2;
    Collection.Item(0) := GxColor.FromName("Red");
    Collection.Item(1) := GxColor.FromName("Blue");
    PieVisual.Radius.Value := 1.5;
End Sub Button1OnClick;

After executing the example the pie indicator, which is filled with red and blue, is added to the Regions layer:

See also:

IMapLayerVisuals