Latest Ruler in a layout window

If you have code that creates the rulers, then you could create a group (dbCreateGroup) which is ordered and add each new ruler to that group. Then you'd know.

Other than that, you can empirically find that the last ruler seems to be:

car(last(setof(marker cv~>markers marker~>objType=="ruler")))

However, I don't think there's any guarantee that the rulers will be returned in a particular order. It seems to be that the last in the list is the latest added, but since this is not documented, it could well change due to implementation optimisation at some point. So proceed with care...

Regards,

Andrew

Unknown said:

Thanks very much. I hope on the basis of undo operation I can find latest rule.

I have no idea what you mean by that.

Andrew.

This code select the latest ruler I guess. I do written it but not extensively tested. Please comment.

 leHiCreateRuler()

RulerBeforeUndo=setof(x cv~>markers x~>objType=="ruler")

hiUndo()

RulerAfterUndo=setof(x cv~>markers x~>objType=="ruler")

hiRedo()

foreach(x RulerBeforeUndo

    xyz=member(x RulerAfterUndo)

        if(xyz then

            t

        else

            geSelectFig(x)

        )

    )

Hmm, not sure I'd ever want to rely on using undo and then redo in any code - it strikes me as a recipe for something going wrong (especially as undo is not per-cellView).

Andrew.

Why don't you check the rulers before calling leHiCreateRuler() and then again afterwards rather than using undo?

Unfortunately even the leCreateRuler() API doesn't return the dbId of the ruler (this is for historical reasons - rulers weren't implemented using database objects in the past). That might be one solution - although presumably you'd want the interactive benefits of using leHiCreateRuler.

Perhaps if I understood why it matters to you to find the last ruler, I might be able to suggest an option?

If anything, if you really have to find the last one, I'd probably go for relying on the order in the database rather than using undo and redo. Perhaps it would just be best to contact customer support with sufficient details as to the problem you're trying to solve, so that an enhancement request to find the last ruler could be filed (you'd have to give some strong justification though for why you need this, I think).

Regards,

Andrew.

Hi Andrew,  That does not work  as with repeat command because if we draw few rulers without canceling hiCreateRuler function, we are may not able to again latest. So it fails. If we need to do so, then we need to go for enter functions and  re-code entire ruler creation procedure. Can we get basic ruler drawing ruler code?

Out requirement is we are doing some operations on layout depending on the latest ruler. If already exist old rulers the functions what I coded for operations misbehave.

Also, when hiCreateRuler() is active, the edge gets highlighted(snapping the edges.) If we want to do such hiligiting/sanpping to edge by mouse pointer how can we code? Can you please help me.

There is no public SKILL API to do the edge snapping - so implementing your own this way can't really be done.

Relying on the last added ruler is a rather unusual use model - nothing else in Virtuoso works that way (that I can think of). Could your code not just get the user to select the ruler they want to use? That way it's not just dependent upon whatever was added last.

Regards,

Andrew.