[Qgis-developer] Re: project file transformation

[Tim Sutton]

Hi Marco

Did you try QPrinter::ScreenResolution? Though I fear it may also
require QtGui. Have a poke around in qgsquickprint.cpp to see my
haphazrd way of trying to do dpi coversions between screen medium and
print medium.


Regards

Tim

On 6/18/08, Marco Hugentobler <marco.hugentobler at karto.baug.ethz.ch> wrote:
> Hi,
>
> Ok, I wrote a transformation function from 0100 to 0110 in
> qgsprojectfiletransform.cpp that adapts the pen width and pointsize.
> However,
> to calculate the appropriate value, it is necessary to know the screen dpi.
> What I did was to query QPixmap for it. I know this is bad, because
> qgsprojectfiletransform is in core and QPixmap is a class that depends on a
> running X-server. So I see the following possibilities:
>
> 1. Remove the include of QPixmap and use a standard dpi value (e.g. 96 for
> my
> screen here)
> 2. Use QPixmap (current Code)
> 3. Someone knows about a better possibility to find out screen dpi
>
> My preferred possibility is 3. If this is not possible, then probably
> version
> 1 is best. Let me know what you think.
>
> Btw. I found that there was a function to transform from 0.9.1 to 0.10.0 and
> no function that adresses 0.9.2. I inserted a function from 0.9.2 to 0.10.0
> that does nothing, but it would be cleaner to have transformation from 0.9.1
> to 0.9.2 and from 0.9.2 to 0.10.0.
>
> Regards,
> Marco
>
> Am Samstag 17 Mai 2008 16:06:16 schrieb Tim Sutton:
>> Hi Marco
>>
>> I wonder if its not better to make the change in Magnus Homanns rev-up
>> code since this issue is going to affect everyone with old project and
>> QGS files.
>>
>> regards Tim
>>
>> On 5/17/08, Marco Hugentobler <marco.hugentobler at karto.baug.ethz.ch>
>> wrote:
>> > Hi Tim,
>> >
>> > The failing renderer tests are caused by the fact that units are now mm
>> > instead of pixel.
>> > I' going to change the width/size values of the test qmls and the test
>> > images
>> > to make it run again.
>> >
>> > Regards,
>> > Marco
>> >
>> > Am Freitag 16 Mai 2008 21:19:56 schrieb Tim Sutton:
>> >> Hi All
>> >>
>> >> Recent commits in the last few days have introduced regressions (as
>> >> can be seen by running the unit tests). Please remember to run the
>> >> unit tests before committing changes to SVN. Currently we only have a
>> >> few tests but they test core stuff like rendering. If you committed
>> >> anything in the last few days please take a look and see if you have
>> >> introduced these issues.
>> >>
>> >> The issues involve mainly symbol sizes for rendering as best I can
>> >> make out. BTW I have not yet tried the test suite under win,but it
>> >> works under mac & lin.
>> >>
>> >> Many thanks
>> >>
>> >> Tim
>> >
>> > --
>> > Dr. Marco Hugentobler
>> > Institute of Cartography
>> > ETH Zurich
>> > Technical Advisor QGIS Project Steering Committee
>> > _______________________________________________
>> > Qgis-developer mailing list
>> > Qgis-developer at lists.osgeo.org
>> > http://lists.osgeo.org/mailman/listinfo/qgis-developer
>
>
>
> --
> Dr. Marco Hugentobler
> Institute of Cartography
> ETH Zurich
> Technical Advisor QGIS Project Steering Committee
>

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Tim Sutton
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