[Qgis-developer] Transformation & labeling bug

[Larry Shaffer]

Hi Anita,

On Sun, Apr 28, 2013 at 1:27 PM, Anita Graser <anitagraser at gmx.at> wrote:

> Am 28.04.2013, 18:01 Uhr, schrieb Andre Joost <andre+joost at nurfuerspam.de
> >:
>
>  Am 27.04.2013 16:14, schrieb Anita Graser:
>>
>>> Hi,
>>>
>>> I get nasty forward transformation errors with today's nightly when
>>> using a predefined road style and labels:
>>>
>>> forward transform of
>>> (12557.230023, 71897.228375)
>>> PROJ.4: +proj=longlat +datum=WGS84 +no_defs +to +proj=aea +lat_1=55
>>> +lat_2=65 +lat_0=50 +lon_0=-154 +x_0=0 +y_0=0 +datum=NAD27 +units=us-ft
>>> +no_defs
>>> Error: latitude or longitude exceeded limits
>>>
>>> (afterwards QGIS hangs)
>>>
>>> Data is Natural Earth's road shapefile in WGS84.
>>> (http://www.naturalearthdata.**com/http//www.**
>>> naturalearthdata.com/download/**10m/cultural/ne_10m_roads.zip<http://www.naturalearthdata.com/http//www.naturalearthdata.com/download/10m/cultural/ne_10m_roads.zip>
>>> )
>>>
>>>
>> The layer extent is:
>> xMin,yMin -166.532;-55.1121 : xMax,yMax 178.372;71.1777
>>
>> so I don't know what coordinates are to be forward transformed in your
>> error message. Has your road style and labelling any coordinate information?
>>
>
> I'm using the "Primary road" style which comes with nightly by default.
> The style alone seems to work. Once I enable labeling using street "name",
> the forward transform error pops up.
>

I can confirm this on Mac. However, it doesn't happen when labeling is
turned on, but when symbol levels are set (and labeling is on). Symbol
levels and labels work individually, but if either is turned on when the
other is on the error occurs and force quitting becomes the only option.

I get the following (note it is being on-the-fly transformed to UTM here):

Debug: src/core/qgspallabeling.cpp: 1305: (registerFeature) Ignoring
feature 1893 due PAL exception: Geometry Type is unknown
Debug: src/core/qgscoordinatetransform.cpp: 623: (transformCoords)
Projection failed emitting invalid transform signal: forward transform of
(25075.946436, 81366.459079)
PROJ.4: +proj=longlat +datum=WGS84 +no_defs +to +proj=utm +zone=13
+datum=WGS84 +units=m +no_defs
Error: latitude or longitude exceeded limits

I've traced it to line 1057 in qgspallabeling.cpp [0]. Just guessing, but
it looks like something is different between how the features are sent to
QgsPalLayerSettings::registerFeature from
QgsVectorLayer::drawRendererV2Levels as opposed to
QgsVectorLayer::drawRendererV2, which works fine.

Please create a ticket if you have the time.

[0]
https://github.com/qgis/Quantum-GIS/blob/master/src/core/qgspallabeling.cpp#L1056

Regards,

Larry


> Earlier today I used a different style and no error happened so you might
> be on to something with your theory that the road style contains coordinate
> information.
>
> Thanks and best wishes,
> Anita
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