[Qgis-user] An idea/wish for QGIS

[Andreas Neumann]

Hi Jorge,

So you would like to place already created SVG charts/diagrams at given 
point features in the map and one column in the data would indicate the 
SVG file name? Is this correct?

If yes, it shouldn't be too hard to implement. We already have 
data-defined label properties, data defined symbol scaling and rotation. 
It should also be possible to choose SVG symbols from a data column. I 
would have use-cases for such a data-defined property as well.

You can already add certain folders to the SVG symbol list, so you could 
add the folder containing the SVG diagrams and then choose the column 
containing the filenames fo the symbols.

Andreas

On 11/24/10 9:08 PM, Tim Sutton wrote:
> Hi
>
> 2010/11/23 Jorge Tornero<jorge.tornero at cd.ieo.es>:
>> Hi all,
>>
>> well, I've been experiencing lately with QGis diagram overlay feature
>> and I have to say that is still not enough for what I need. Plots are
>> not very customizable, adding categories is a matter of patience when
>> you have a relatively large amount of fields to plot (in my case, in
>> anchovy length distribution, about 25 of them) and normalization of the
>> diagrams is a little confusing. Anyway, it is a big feature but
>> unfortunately at last I have had to make my maps with gvSIG what really
>> disappoints me because map tools in gvSIG are (for me) a little bit
>> poor.
>>
>> But I'have been messing with qgis new simbology and I have found very
>> interesting the option "RULE BASED" (I guess this is the correct
>> translation for the spanish "Basado en reglas"). Because I can define
>> individual marker for different values (based in that rules), I've done
>> the following:
>>
>> 1) I've created an bar chart with matplotlib as I want it to be (scale,
>> ticks..., colors)
>> 2) I've saved it to a folder in my computer as SVG graphic, say
>> so /home/Figures
>> 3) I've created a soft link to that folder in /usr/local/share/qgis/svg
>>
>> Following this steps, what I get is the chance to choose my graph as the
>> marker of my point and I have to say that is really, really cool for me
>> because the look of the maps is great!!
>>
>> But there is one problem... You can choose the graph but you don't have
>> any clue to tell which graph is what you want, because all you get in
>> the dialog of selection are the thumbnails of the SVG's in that
>> folder!!! So with, let's say 20 micro-pictures to choose is not very
>> useful...
>>
>> So my idea/suggestion/wish is: To add to the symbol properties dialog
>> the possibility of loading a concrete SVG as marker, apart from the list
>> of default markers. It will not be a feature like automatic diagram
>> overlay but I think it is a very simple improvement that provides a
>> solution and eases the work of overlaying charts in maps (not only pie
>> and bar charts)
>>
>> I don't really know if this is of any use for you but in my case, it has
>> been the big prize in days, because I feared of having to say goodbye to
>> Qgis until the diagram feature is improved.
>>
>> Also I apologize if what I've said is just a obviousness... Maybe this
>> is a feature everybody knows and here I am thinking that I've discovered
>> the Philosopher's stone... :)
>>
> To summarise - you want the option to select an svg marker using a
> file dialog rather than choosing it from the icon list?
>
> Regards
>
> Tim
>
>
>> Best regards
>>
>> Jorge Tornero
>>
>>
>> --
>> -----------------------------------------
>> Jorge Tornero Núñez
>> Centro Oceanográfico de Cádiz
>> Instituto Español de Oceanografía
>> Puerto Pesquero - Muelle de Levante, s/n
>> 11006 Cádiz - España
>> Tel. +34 956294189
>> Fax. +34 956294232
>> www.ieo.es
>>
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