Data defined override into legend items automatically

[qgib]

Author Name: Patrick Harvey (Patrick Harvey)
Original Redmine Issue: 20267

Redmine category:map_legend

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I have been using QGIS for a while now and I am trying to display 2 sets of data at a point. Manipulating size and colour are the logical choices for me and I have used data defined override. The GIS displays this fine in the main data window, and on the print layout, however, when I create my legend there is no data defined override for the colour or the size in the legened.

Is there a way to do this or is this not yet a feature?

If it is not a feature then when will it become one?

Kind regards,

Pat.

[qgib]

Author Name: Giovanni Manghi (@gioman)

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duplicate/similar to this #19761 ?

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• category_id was changed from Attribute table to Map Legend
• status_id was changed from Open to Feedback

[qgib]

Author Name: Patrick Harvey (Patrick Harvey)

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Thanks for that!! I still took me a bit to work it out with the info they had there and there are some very specific things you need to set to get it to display properly, but I got there. I may look at putting it in the user manual at some point in the near future to help others.

[qgib]

Author Name: Giovanni Manghi (@gioman)

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Patrick Harvey wrote:

Thanks for that!! I still took me a bit to work it out with the info they had there and there are some very specific things you need to set to get it to display properly, but I got there. I may look at putting it in the user manual at some point in the near future to help others.

did you find the solution to your problem in that ticket? if yes can you explain please?

[qgib]

Author Name: Patrick Harvey (Patrick Harvey)

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It is a little more complicated than just looking at that ticket.

It gave me a few key words that I searched online. I realised that I was using the wrong kind of categorisation. I was using a simple marker where I needed to be using a graduated symbol (or one that allowed me to make a data defined legend) with colour to define one of my fields (in my case gold) and then I needed to data define the override on the size of the marker (arsenic). This then gave me the option of a data defined legend. I also had to set the default size of my marker in the data defined size override to greater than 0 otherwise it did not show on the legend.

If you need more detail I would be happy to help out. If it is needed I can write this into the user manual so that other people can use it too.

[qgib]

Author Name: Harrissou Santanna (@DelazJ)

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Maybe I don't understand well your initial report but based on your last feedback, maybe you were in need of something like https://docs.qgis.org/testing/en/docs/user_manual/working_with_vector/vector_properties.html#proportional-symbol-and-multivariate-analysis? which is a bit different from the other thread.

If it is needed I can write this into the user manual so that other people can use it too.

Yes please! Help improve the manual with anything that can be valuable for users.

[qgib]

Author Name: Patrick Harvey (Patrick Harvey)

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Yes that is exactly what I needed. I will still look at writing it into the user manual in a clear and simple manner.

[DelazJ]

@gioman maybe could we close this one? I don't remember whether we got the fix in the docs but there seems to be no issue in the application, anyway.