[Qgis-user] Send us your tips!

[Tim Sutton]

Hi

Going back to the original message, I added the tip with included
image (adapted a little). See

http://img6.imagebanana.com/img/sbt1n9mj/image03.jpeg

Thanks - keep those tips coming!

Regards

Tim

On Wed, Mar 2, 2011 at 11:16 AM, Martin Dobias <wonder.sk at gmail.com> wrote:
> On Wed, Mar 2, 2011 at 9:56 AM, Tim Sutton <lists at linfiniti.com> wrote:
>> Hi Martin
>>
>> On Wed, Mar 2, 2011 at 10:48 AM, Martin Dobias <wonder.sk at gmail.com> wrote:
>>> On Wed, Mar 2, 2011 at 12:25 AM, Alister Hood
>>> <alister.hood at synergine.com> wrote:
>>>> But I think symbol levels should probably be enabled by
>>>> default, in which case this tip wouldn't be necessary :)
>>>
>>> Rendering with symbol levels is more costly, so -1 for me to enable it
>>> by default.
>>>
>>
>> I remember debating this with you at Wroclaw. Is it more costly also
>> in situations where symbols are simple and have 1 layer each only? In
>> the case of multilayer symbols I would say 99% of the time I want
>> symbol levels on. I do quite a lot of training and the symbol levels
>> is something that a) new users struggle to comprehend and b) gets
>> forgotten as a detail after the training and then people come back to
>> me asking why their maps look funny. I think from a user friendliness
>> point of view, there would be a lot gained by enabling it by default
>> (performance issues notwithstanding). Maybe we should add it as
>> another item in our endless options panel (which I will reorganise in
>> Lisbon)?
>
> Hi Tim
>
> yes, it's more costly also for symbols with just one symbol layer. The
> idea is that the features in current view are loaded into memory first
> (with a reference to symbol that will be used) and then rendered. So
> there is some memory overhead and some cpu overhead (unsure about the
> total amount). The case with just one symbol layer could be probably
> optimized to some degree.
>
> I am not sure what to do here. The concept of symbol level is quite
> advanced and becomes more complex when drawing things like highway
> crossing (I still haven't found time to write a blog post explaining
> how that could be done). Maybe another topic for upcoming hackfest?
> :-)
>
> Martin
>



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Tim Sutton - QGIS Project Steering Committee Member (Release  Manager)
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