ITGIS_DynamicAggregatorAbstract.Prepare method

DK for ActiveX | TatukGIS_XDK11.ITGIS_DynamicAggregatorAbstract.Prepare | Methods | Properties

Generate aggregated shapes for the visible extent using the current aggregation algorithm.

Available also on: Delphi | .NET | Java | Python.

// C#
public void Prepare(
  ITGIS_Extent _extent,
  WideString _query
);

' VisualBasic
Public Sub Prepare(
  ByVal _extent As ITGIS_Extent,
  ByVal _query As WideString
)

// Oxygene
public
  procedure Prepare(
    _extent : ITGIS_Extent;
    _query : WideString
  );

PURPOSE: Implement the core aggregation logic for visible vector features, such as clustering, binning, or other summary representations used during rendering.

BEHAVIOR: Abstract method implemented by descendants. It is called during the draw cycle and processes shapes within _extent that match _query. Use HideShape to suppress source shapes and AddShape to register aggregated output shapes.

CONSTRAINTS: Abstract method. Aggregated output registered here is valid only for the current draw cycle and is cleared after rendering completes.