IVZDataSourceMapping.DataTransformer

Syntax

Description

The DataTransformer property determines data transformer.

Example

Executing the example requires that the repository contains an express report with the EXP identifier. The Size metric should be selected in the bubble tree report. The module containing the example should have links to the Express, Metabase and Visualizators system assemblies. The specified procedure should be called from the Main entry point.

Transform a set of numbers by the custom transformer used to increase the input value as much as 20 times:

// Determine custom data transformer
Class MyAdapter: object, IVZDataAdapter
    // Input value is to be increased 20-fold
    Function GetData(Value: Variant): Variant;
        Begin
        Return Value * 20
    End Function GetData;
End Class MyAdapter;

Sub UserProc;
Var
    Metabase: IMetabase; // Metabase
    EaxAnalyzer: IEaxAnalyzer; // Express report
    BubbleTree: IVZBubbleTree; // Bubble tree
    SizeVisual: IVZNumericVisual; // Visualizator of tree bubbles size
    DataSourceMapping: IVZDataSourceMapping; // Settings for data mapping with colors
    DataTransformer: IVZDataAdapter; // Data transformer
Begin
    // Get metabase object
    Metabase := MetabaseClass.Active;
    // Open express report
    EaxAnalyzer := Metabase.ItemById("EXP").Edit As IEaxAnalyzer;
    // Get bubble tree
    BubbleTree := EaxAnalyzer.BubbleTree.BubbleTree;
    // Get visualizer used to determine tree bubbles size
    SizeVisual := BubbleTree.SizeVisual;
    // Get settings of data mapping
    DataSourceMapping := SizeVisual.NumericMapping;
    // Set mapping type "Data transformer"
    DataSourceMapping.MappingType := VisualizatorDataMappingType.DataMappingTransformer;
    // Create and set custom data transformer
    DataTransformer := New MyAdapter.Create;
    DataSourceMapping.DataTransformer := DataTransformer;
    Debug.WriteLine("Data transformation:");
    Debug.IndentLevel := 1;
    Debug.WriteLine("Input: -0.05, output: " +
        ((DataTransformer.GetData(-0.05)) As Double).ToString);
    Debug.WriteLine("Input: 0, output: " +
        ((DataTransformer.GetData(0)) As Double).ToString);
    Debug.WriteLine("Input: 0.05, output: " +
            ((DataTransformer.GetData(0.05)) As Double).ToString);
    Debug.WriteLine("Input: 5, output: " +
            ((DataTransformer.GetData(5)) As Double).ToString);
    Debug.WriteLine("Input: 1000, output: " +
            ((DataTransformer.GetData(1000)) As Double).ToString);
    // Set visualizer used to determine tree bubbles size
    BubbleTree.SizeVisual := SizeVisual;
End Sub UserProc;

After executing the example, the custom transformer is created used to increase output value as much as 20 times, the development environment console window shows results of number transformation: -0.05, 0, 0.05, 5 and 1000:

Data transformation:

Input: -0.05, ouput: -1

Input: 0, output: 0

Input: 0.05, output: 1

Input: 5, output: 100

Input: 1000, output: 20000