IMapLayerVisuals.Add

Syntax

Add(Visual: IMapVisual): Integer;

Parameters

Visual - factor, which index should be obtained.

Description

The Add method returns the index of the specified collection factor.

Example

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;

s: Integer;

Color: IMapVisualColorProperty;

StartC, EndC: IGxColor;

Scale: IMapColorScale;

Begin

Map := UiMap1.Map;

Layer := Map.Layers.FindByName("Regions");

AreaVisual := Layer.Visuals.AddAreaVisual;

s := Layer.Visuals(AreaVisual);

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 a map factor is added to the Regions layer. The "s" variable contains its index in the collection of layer factors.