HeightVisual: IVZNumericVisual;
The HeightVisual property determines visualizer used to set the height of tree map children.
Executing the example requires that the repository contains an express report with the EXP identifier. The unit 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 that increases the input value as much as five times:
// Determine custom data transformer
Class MyAdapter: object, IVZDataAdapter
// Input value is to be increased as much as five times
Function GetData(Value: Variant): Variant;
Begin
Return Value * 5
End Function GetData;
End Class MyAdapter;
Sub UserProc;
Var
Metabase: IMetabase;
EaxAnalyzer: IEaxAnalyzer;
TreeMap: IVZTreeMap;
HeightVisual: IVZNumericVisual;
DataSourceMapping: IVZDataSourceMapping;
DataTransformer: IVZDataAdapter;
Begin
// Get the current repository
Metabase := MetabaseClass.Active;
// Get express report
EaxAnalyzer := Metabase.ItemById("EXP").Edit As IEaxAnalyzer;
// Get tree map
TreeMap := EaxAnalyzer.TreeMap.TreeMap;
// Create new visualizer object
HeightVisual := New VZNumericVisual.Create;
// Get settings of data mapping
DataSourceMapping := HeightVisual.NumericMapping;
// Set the Data Transformer mapping type
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: 1, output: " +
((DataTransformer.GetData(1)) As Double).ToString);
Debug.WriteLine("Input: 5, output: " +
((DataTransformer.GetData(5)) As Double).ToString);
Debug.WriteLine("Input: 30, output: " +
((DataTransformer.GetData(30)) As Double).ToString);
// Set visualizer used to determine tree elements height
TreeMap.HeightVisual := HeightVisual;
End Sub UserProc;
After executing the example, the custom transformer increasing output value five fold is created, the development environment console window shows results of transformation for numbers 1, 5 and 30:
Data transformation:
Input: 1, output: 5
Input: 5, output: 25
Input: 30, output: 150
See also: