How to change dynamically the number of lines to show in time chart

Hello all,
I need your help for the following scenario:
In browser is an applet available that contains a tree. Each tree node have the id. The user can select a tree node and open a crystal report with time chart. This time chart shows values for tree node id(y-axis). The values are measurement values from database. The database table contains:
id_field = tree node id,
value_field = measurement value,
and time_field.
So, my problem is that the user can select more than one tree node. The maximum selection count is 16.
My idea is to do something in the following way:
1) create function ("myFunction")
2) set function as filter
3) add my function (or parameters)to y axis
For example:
filter:
if {@time_field} in {@time_begin_param} to_ {@time_end_param} and {@myFunction}
"myFunction"-function:
if ( treenode_id1 != -1 )
then "if {@id_field} = treenode_id1"
else if ( treenode_id2 != -1 )
then "if {@id_field} = treenode_id1 or {@id_field} = treenode_id2"
When the user selection is changed:
1) in my struts action u2013 create report programmatically
2) set parameter treenode_id1 u2013 treenode_id16 equals user selection
3) open report
My question is what is the correctly way to solve my problem?
And here some concrete questions:
1) When I set 16 parameters for y axis how can I hide unused parameters?
2) When I'm using filter with function is the function in db request or are all data requested and then filtered?
3) Can I add data set to my chart programmatically from my struts action?
4) When it is possible can I add parameters to y axis also programmatically?
5) Is it possible to change data set of crystal report without recreating the report?
Any help is appreciated!
(and sorry for my bad english)
Greetings,
Nikolas

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How to change dynamically the number of lines to show in time chart

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