Steema Central

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        private void GenerateSeries() 
        {
            Line oryginalPoints = new Line();
            FastLine reduceLine = new FastLine();

            double[] speedData = new double[60 * 60 * 24]; // sec per day
            DateTime[] times = new DateTime[60 * 60 * 24];

            /*
             * preparing sample data
             * car speed in each second (24h period)
             * gives over 86 000 points
             * this amount slows TeeChart extemlly
             */
            DateTime x = DateTime.Now.Date;
            Random rand = new Random((int)DateTime.Now.Second);
            double prev = 0;
            for (int i = 0; i < 60 * 60 * 24; i++) 
            {
                times[i] = x + TimeSpan.FromSeconds(i);
                speedData[i] = prev + rand.Next(-10, 10);
                if (speedData[i] < 0) speedData[i] *= -1;
                if (speedData[i] > 120)
                {
                    double tmp = 120 - (speedData[i] - 120);
                    speedData[i] = tmp;
                }
                prev = speedData[i];
            }

            oryginalPoints.Color = Colors.Red;
            oryginalPoints.Title = "oryginal";

            reduceLine.Color = Colors.Green;
            reduceLine.Title = "reduce";
            
            tChart.Series.Add(oryginalPoints);
            tChart.Series.Add(reduceLine);

            DownSampling sampling = new DownSampling(tChart.Chart);
            
            /*
             * 
             * change to True to see something on chart
             * False generates empty chart
             * 
             */            
            oryginalPoints.Active = true;
            
            
            oryginalPoints.Add(times, speedData);
            oryginalPoints.XValues.DateTime = true;
            sampling.Method = DownSamplingMethod.Average;
            sampling.DisplayedPointCount = 1000;
            sampling.PeriodStyle = PeriodStyles.Range;
            sampling.Period = 5;
            reduceLine.DataSource = oryginalPoints;
            reduceLine.XValues.DateTime = true;
            reduceLine.Function = sampling;
            reduceLine.CheckDataSource();

        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            GenerateSeries();
        }

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					points.Color = Colors.Transparent;