Обсуждение: TSeries

I have a problem:

I have realized a graphic interface with Borland Builder C++4 that permits

to graph file.txt .  I utilize, for the graphs one TChart and one Series.

I have to draw vertical lines on a graph to select intervals . I know  the number of vertical lines

after the run, reading a results file. The number of vertical lines change every run.

How can I create the vertical lines?

I wish I could select an interval of graph and realize a zoom of interval same.

How can I do it?

 

Thank you for your help.