TdxMapLayers.Add(TdxMapLayerClass) Method

Creates a map layer of a specified type and appends it to the collection.

Declaration

function Add(AItemClass: TdxMapLayerClass): TdxMapLayer;

Parameters

Name	Type
AItemClass	TdxMapLayerClass

Returns

Type
TdxMapLayer

Remarks

AItemClass specifies the class of map layer to be created. Pass a built-in map layer class (TdxMapImageTileLayer, TdxMapItemFileLayer, or TdxMapItemLayer) or a custom one (a TdxMapLayer descendant) as this parameter. The created map layer is returned as the function’s result.

The following code example shows how to add an item file layer to a map control using the Add method and load data from an Esri shapefile to this layer.

uses
   ..., dxMapItemFileLayer;
var
  AMapItemFileLayer: TdxMapItemFileLayer;
begin
  AMapItemFileLayer := TdxMapItemFileLayer(<dxMapControl>.Layers.Add(TdxMapItemFileLayer));
  AMapItemFileLayer.FileType := miftShape;
  AMapItemFileLayer.LoadFromFile('Countries.shp');
end;

In addition to the Add method, you can create specific built-in map layers using a map control’s AddImageTileLayer, AddItemFileLayer, and AddItemLayer functions.