Markers

histry · Post by **histry** » Wed Sep 20, 2006 4:16 pm

Is it possible to display just the marker on a fastline and not any value etc

Narcís · Post by **Narcís** » Thu Sep 21, 2006 8:21 am

Hi histry,

You can try doing something like this:

      fastLine1.Marks.Visible = true;
      fastLine1.Marks.Arrow.Visible = false;
      fastLine1.Color = Color.Transparent;

If that's not what you are looking for, could you please be more specific on what you need?

histry · Post by **histry** » Thu Sep 21, 2006 12:08 pm

What I need to do is display the fastline with markers. I dont want to see any labels like the value, percent etc.

Narcís · Post by **Narcís** » Thu Sep 21, 2006 2:24 pm

Hi histry,

What do you exactly mean with "markers"?

Thanks in advance.

histry · Post by **histry** » Thu Sep 21, 2006 2:27 pm

I would like to see the symbol (square) but not the label

Narcís · Post by **Narcís** » Thu Sep 21, 2006 2:47 pm

Hi histry,

You may mean the series pointer. FastLine series, for its nature, doesn't have pointers. To use them you should use Line series:

Code: Select all

    Steema.TeeChart.Styles.Line line1 = new Steema.TeeChart.Styles.Line(tChart1);
    line1.FillSampleValues();
    line1.Pointer.Visible = true;

histry · Post by **histry** » Thu Sep 21, 2006 2:56 pm

I agree that is what I am looking for. The issue I have is that I have very large data arrays and need the performance of the fastline. Is there any plans on supporing points for fastlines in future releases.

Narcís · Post by **Narcís** » Thu Sep 21, 2006 3:00 pm

Hi histry,

I don't think so as for FastLine to be as fast as possible we need to use the minimum elements possible.

For some hints on how to optimize your chart performance you can read this article and have a look at the All Features\Welcome !\Speed examples in the features demo, available at TeeChart's program group.

histry · Post by **histry** » Thu Sep 21, 2006 3:05 pm

Would be nice if you could display a couple of points on a fastline for printing purposes. I understand your concern but you could implement it the same a markers where you can set a property for the number of markers to display

Narcís · Post by **Narcís** » Fri Sep 22, 2006 8:48 am

Hi histry,

You can already custom draw the marks on the chart's canvas doing something like this:

Code: Select all

    private void DrawSeriesPointers()
    {
      Rectangle r = new Rectangle();

      for (int i = 0; i < tChart1[0].Count; i++)
      {
        r.Width = 5;
        r.Height = r.Width;
        r.X = tChart1[0].CalcXPos(i) - (r.Width  / 2);
        r.Y = tChart1[0].CalcYPos(i) - (r.Height  / 2);        

        tChart1.Graphics3D.Brush.Visible = true;
        tChart1.Graphics3D.Rectangle(r);
      }
    }

    private void tChart1_AfterDraw(object sender, Steema.TeeChart.Drawing.Graphics3D g)
    {
      DrawSeriesPointers();
    }

Marjan · Post by **Marjan** » Fri Sep 22, 2006 5:45 pm

9642161 wrote:Would be nice if you could display a couple of points on a fastline for printing purposes. I understand your concern but you could implement it the same a markers where you can set a property for the number of markers to display

If you only need to display couple of points, then the best solution is to add another "regular" point series to chart, populate it with specific points from fastline series and then format it according to your needs. This way you'll still be able to benefit speed from fastline series.

histry · Post by **histry** » Fri Sep 22, 2006 6:15 pm

These are all good work arrounds. I guess the question is for version 3 is there any consideration on adding points to the fastline series where you can specify that you only want the points displayed every so many data points. Similar to the way that markers work.

When printing the charts with something other than color printers it is important to be able to associate a symbol to a series.

Thanks

Narcís · Post by **Narcís** » Mon Sep 25, 2006 7:58 am

Hi histry,

I don't think it's going to be implemented. However, using line series with visible pointers or point series you can also choose which pointers you want to display using the GetPointerStyle as shown on this message.

histry · Post by **histry** » Mon Sep 25, 2006 2:26 pm

I need the performance of your fastline as I am returning 10's of thousands of points.

Marjan · Post by **Marjan** » Tue Sep 26, 2006 1:03 pm

I think any additional coding (including filtering of points before displaying) would most likely create an overhead i.e. the fastline series would become slower.