RiverSoftAVG Products Help

Zoom Window Out
Larger Text | Smaller Text
Hide Page Header
Show Expanding Text
Printable Version
Send Mail Feedback
Save Permalink URL

Navigation: Code Documentation > RSFMXCharts > FMX.RS.ChartFunction > Classes > TRSFMXCustomChartFunction > Events

TRSFMXCustomChartFunction.OnCustomFunction Event

Create an OnCustomFunction event handler to write your own functions. Note that the OnCustomFunction event handler is called for every Period in the SourceChart.

You only need to write the function itself and for adding value(s) to the TargetChart. The TRSCustomChartFunction class does all the housekeeping necessary for preparing the TargetChart (e.g., calling BeginUpdate/EndUpdate, clearing values)

Note
The OnCustomFunction event is only called if the FunctionType is cftCustom.

Namespace: FMX.RS.ChartFunction

Value

Type: TRSChartFunctionEvent

Delphi

procedure frmChartFunction.RSChartFunction1CustomFunction(const SourceChart, TargetChart: TRSCustomChart; IndexLow, IndexHigh: Integer;
TimeStamp: TDateTime);
var
   I: Integer;
   aResult: TRSChartValueType;
begin
   // function to calculate the minimum value in the period
   aResult := SourceChart.Values[IndexLow].Value;
   for I := IndexLow+1 to IndexHigh do
     if SourceChart.Values[i].Value < aResult then
       aResult := SourceChart.Values[i].Value;
   if TargetChart.Values.DimensionCount > 1 then
     TargetChart.Values.Add([TimeStamp, aResult])
   else
     TargetChart.Values.Add(aResult);
end;

RiverSoftAVG Products Help

Reference