[Qgis-user] Atlas data defined rotation moves features out of view

[Nyall Dawson]

On 21 Nov 2016 5:43 PM, "Benjamin Wragg" <support at isasolutions.com.au>
wrote:

Hi,

I’m using 2.18.0 and am having a problem with using the “Map Rotation"
feature in the Atlas.

We have a layer filed with polygons which Atlas uses as its coverage layer.
So the Atlas creates a map of each polygon and it zooms to the edge of the
polygon and then puts a 1% margin on it. On the polygon layer we’ve added a
rotation value field and on some we rotate it if needed e.g  if it looks
like this:

_______________________
|                  ____                   |
|                  |      |                   |
|                  |      |                   |
|                  |___|                   |
—————————————

We enter a value of 90 and it rotates the map 90 degrees as expected so it
can print like:

________________________
|    ___________________    |
|    |                                    |    |
|    |                                    |    |
|    |__________________|    |
—————————————

The problem I’m having is that if the polygon is an unusual shape it
rotates it out of the map frames extent e.g

No rotation - https://www.dropbox.com/s/unolamtod3ntu9u/0Rotate.png?dl=1 <
https://www.dropbox.com/s/unolamtod3ntu9u/0Rotate.png?dl=1>
problem when 30 degrees of rotation - https://www.dropbox.com/s/
p5uv3gy360e54js/30Rotate.png?dl=1 <https://www.dropbox.com/s/
p5uv3gy360e54js/30Rotate.png?dl=1>

Atlas seems to do things in this order when I change the current Atlas
polygon:

1. Get the next polygon
2. Zoom to the polygon
3. Add the 1% margin.
4. Rotate the map as defined in the data

Is there a work around for this anyone has come across?

Is this the way QGIS should work? Should the order be:

1. Get the next polygon
2. Rotate the map as defined in the data
3. Zoom to the polygon
4. Add the 1% margin.


Sounds like http://hub.qgis.org/issues/11954 - can you confirm?

Nyall



Thanks. I have posted a similar question but different issue about 2 years
ago http://lists.osgeo.org/pipermail/qgis-user/2014-December/030178.html <
http://lists.osgeo.org/pipermail/qgis-user/2014-December/030178.html> .
The solution given was to change the map size/orientation. This isn’t an
option for me as I have a fixed map size which must be in landscape.

Thanks,

Benjamin
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