Re: [Qgis-user] View freezing and style

[Nyall Dawson]

On 14 February 2018 at 23:38, Enrico Fiore  wrote:
>
>> Il 14 febbraio 2018 alle 12.43 Nyall Dawson  ha 
>> scritto:
>> >
>>
>> Let me guess - it's a point layer?
>
> yes, it is
>
>> >
>> > Can be a bug?
>>
>> Yes, it is.
>
> I have to open a ticket?

I think there's already an open ticket. I looked into this a while
ago. The culprit is this line (added in 2.16, or 2.18. I can't
recall):

https://github.com/qgis/QGIS/blob/master/src/core/layertree/qgslayertreemodel.cpp#L1524

Which is very slow to calculate, and is called for every symbol in
your layer (so 2381 times) at every map pan/zoom operation.

I only had a brief opportunity to look into it and could not find a
quick fix for this.

Nyall
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Re: [Qgis-user] View freezing and style

[Richard McDonnell]

Hi,
That is a lot of Style filters to be applying, Is there any way you 
could reduce the Categorising?
The other thing is your Indexing, make sure the fields you are using in 
the style are indexed, along with the Geometry.

Regards,

Richard

On 14/02/2018 11:26, Enrico Fiore wrote:


Hi,
I have noticed that QGIS 2.18.16 has strange behavior, that I'm going 
to try to explain.


The view freezes for 3 - 4 seconds after zooming or dezooming action.
View freezing happen only if in the Project there is a specific layer 
with categorized style (the same layer with single simbol style 
doesn't cause the problem).
The layer has 130421 feature (point) and 2381 items in the legend 
(after have applied the style) and the datasource is db (The problem 
raised happens both with data deriving from Oracle and PostgreSQL 
database).



The behaviour didn't happen in qgis 2.8.4.

Has anyone experienced the same problem ?

Can be a bug?


Enrico



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Re: [Qgis-user] View freezing and style

[Enrico Fiore]

> Il 14 febbraio 2018 alle 12.43 Nyall Dawson  ha 
> scritto:
> >
> 
> Let me guess - it's a point layer?

yes, it is

> >
> > Can be a bug?
> 
> Yes, it is.

I have to open a ticket?
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Re: [Qgis-user] View freezing and style

[Nyall Dawson]

On 14 February 2018 at 22:26, Enrico Fiore  wrote:
> Hi,
> I have noticed that QGIS 2.18.16 has strange behavior, that I'm going to try
> to explain.
>
> The view freezes for 3 - 4 seconds after zooming or dezooming action.
> View freezing happen only if in the Project there is a specific layer with
> categorized style (the same layer with single simbol style doesn't cause the
> problem).
> The layer has 130421 feature (point) and 2381 items in the legend (after
> have applied the style) and the datasource is db (The problem raised happens
> both with data deriving from Oracle and PostgreSQL database).
>

Let me guess - it's a point layer?


> The behaviour didn't happen in qgis 2.8.4.
>
> Has anyone experienced the same problem ?
>
> Can be a bug?

Yes, it is.

Nyall
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[Qgis-user] View freezing and style

[Enrico Fiore]

Hi,
I have noticed that QGIS 2.18.16 has strange behavior, that I'm going to try to 
explain.

The view freezes for 3 - 4 seconds after zooming or dezooming action.
View freezing happen only if in the Project there is a specific layer with 
categorized style (the same layer with single simbol style doesn't cause the 
problem).
The layer has 130421 feature (point) and 2381 items in the legend (after have 
applied the style) and the datasource is db (The problem raised happens both 
with data deriving from Oracle and PostgreSQL database).
 

The behaviour didn't happen in qgis 2.8.4.

Has anyone experienced the same problem ?

Can be a bug?


Enrico
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