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TMS FMX Chart
Dynamically pass an array of points

With the OnGetNumberOfPoints and the OnGetPoint there is no loop necessary, the chart internally takes care of this. You only need to pass the number of points, and return the value: 

procedure TForm1.TMSFMXChart1GetNumberOfPoints(Sender: TObject; ASerie: TTMSFMXChartSerie; var ANumberOfPoints: Integer); 
 begin
  ANumberOfPoints := Length(ARRAY);
end;

procedure TForm1.TMSFMXChart1GetPoint(Sender: TObject; ASerie: TTMSFMXChartSerie; AIndex: Integer;
  var APoint: TTMSFMXChartPointVirtual); 
 begin
  APoint.YValue := ARRAY[AIndex];
end;