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  • When should the aggregation be used?
  • Aggregation and type of charts
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Stored procedures
<Chart>.ColumnAggregation (Function)
In french: <Graphe>.HistoAgrégation
Defines the algorithm for aggregating data in a clustered or stacked Column chart.
Example
// Code of Radio Button control used to select the aggregation type
// Store the selected type of aggregation
let nAggregation = SWITCH (RADIO_AggregationType, grhaNone, grhaMax, grhaMin, grhaMean, grhaSum)
 
// Apply the aggregation
CHART_Chart.ColumnAggregation(nAggregation)
 
// Redraw the example
CHART_Chart.Draw()
Syntax
<Chart control>.ColumnAggregation(<Algorithm>)
<Chart control>: Control name
Name of the Chart control to use (found in the window editor, page editor or report editor).
<Algorithm>: Integer constant
Aggregation algorithm to use:
grhaNoneNo aggregation.
grhaMaxAggregation according to the maximum of data.
grhaMinAggregation according to the minimum of data.
grhaMeanAggregation according to the mean of data.
grhaSumAggregation according to the sum of data.
Remarks

When should the aggregation be used?

When displaying a Column chart, the bars may become too small to be displayed. This is the case for the charts presenting a time scale. In this case, it becomes necessary to display a bar whose minimum size is the size of a mark and aggregating the data of all potential bars found in this mark.
Example:

Non-aggregated Column chart

Column chart aggregated according to the mean

Aggregation and type of charts

  • For the charts without time scale, the aggregation is not enabled by default.
  • For the charts with time scale, the default aggregation is the sum of columns.
Related Examples:
WD Chart Training (WINDEV): WD Chart
[ + ] This educational example present different uses of the chart control.
The following charts are presented:
- Semi-circular
- Donut
- Pie
- Sunburst
- Line
- Scatter
- 3D Scatter
- Column
- Area
- Bubble
- Radar
- Funnel
- Surface
- Waterfall
- Composite

The main features presented in this example are the ability to customize the charts by programming as well as the method used to fill a chart from a HFSQL file or in the editor.
Component : wd240grf.dll
Minimum required version
  • Version 23
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