Steema Central

Posted: **Wed Apr 06, 2011 1:09 pm**

Hi,

I'm trying to manage a large number of points with no success...

I have to display a curve with more than 500,000 points and be able to zoom in/out on it (under silverlight)
it takes too long (for my requirements) for the zoom frame to be display and to zoom (> 10 seconds...)

can anyone help me ?

here is my code (for 50,000 points):

Code: Select all

Steema.TeeChart.Silverlight.Functions.DownSampling function1;
Steema.TeeChart.Silverlight.Styles.Points points2;

DataChart1.Chart.Series.Add(new Steema.TeeChart.Silverlight.Styles.Points());
DataChart1.Chart.Series[0].FillSampleValues(50000);

points2 = new Steema.TeeChart.Silverlight.Styles.Points(DataChart1.Chart);
points2.Pointer.Style = Steema.TeeChart.Silverlight.Styles.PointerStyles.Triangle;
points2.Color = Color.FromArgb(255, 255, 0, 0);
//points2.Visible = true;
points2.DataSource = DataChart1.Chart[0];
//points2.CheckDataSource();

function1 = new Steema.TeeChart.Silverlight.Functions.DownSampling(DataChart1.Chart);
function1.Method = Steema.TeeChart.Silverlight.Functions.DownSamplingMethod.Average;
function1.Tolerance = 10.0;
function1.DisplayedPointCount = DataChart1.Chart.Series[0].Count / (int)function1.Tolerance;//Convert.ToInt32(function1.Tolerance * 4);

points2.Function = function1;

DataChart1.Header.Text = "Number of Points reduced to " + points2.Count;

Thank you,
Simon

Posted: **Thu Apr 07, 2011 3:03 pm**

Hello Simon,

What about doing as in the code snippet below? It works pretty well for me here.

Code: Select all

        private void InitializeChart()
        {
          //  InitializeComponent();
            tChart1.Series.Add(new Steema.TeeChart.Silverlight.Styles.Points());
            //((Steema.TeeChart.Silverlight.Styles.Points)Chart1.Series[0]).Pointer.Style = Steema.TeeChart.Silverlight.Styles.PointerStyles.SmallDot;           
           tChart1.Series[0].FillSampleValues(50000);

                  tChart1.Aspect.View3D = true;

                  Steema.TeeChart.Silverlight.Functions.DownSampling downSampling1 = new Steema.TeeChart.Silverlight.Functions.DownSampling(tChart1.Chart);               
                  Steema.TeeChart.Silverlight.Styles.Points points1 = new Steema.TeeChart.Silverlight.Styles.Points(tChart1.Chart);
                  
                  points1.DataSource = tChart1[0];
                  downSampling1.Tolerance = 10.0;
                  downSampling1.Method = Steema.TeeChart.Silverlight.Functions.DownSamplingMethod.Average;
                  downSampling1.DisplayedPointCount = tChart1[0].Count / (int)downSampling1.Tolerance;
                  points1.Function = downSampling1;

                  tChart1[0].Active = false;
                 tChart1[0].ShowInLegend = false;
        }

I hope will helps.
Thanks,

Steema Central

.:Silverlight:. Large number of points (>500 000)

.:Silverlight:. Large number of points (>500 000)

Re: .:Silverlight:. Large number of points (>500 000)