On Thu, Aug 23, 2012 at 11:41 AM, obtin <[email protected]> wrote:
> Thank you!
>
> This was a good answer. It was not the one i was looking for, but it made
> me
> think in a new way, and I got my problem solved.
>
> The question I formerly was wondering about, was how to show a sparser view
> of some objects on a specific layer. In my example, I wanted to show only,
> lets say, every 2nd tree on scales smaller than 1:2000 to avoid the objects
> to overlap each other. This would require, I assume, to change the data.
>
>
I see. Yes, doing something like that would be possible by creating a
"counter/sequence"
filter function that creates a sequence of values, and using the remainder
of the
division by 2 to control painting.
However, the above approach has a limit, it would not be encoded towards
the database
so you'd end up loading all the data, even if only a portion of it is
displayed.
In order to actually only load some of the data you'd have to alter your
data, or find
some way to build a SQL statement that does it using native database
functions
to build a flag telling you whether to display the feature or not, and set
up your data
source as a "sql view"
Cheers
Andrea
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