Hi Andrea, interesting feature. However, we should find a simple UI that keeps it simple for common users (a dropdown "advanced" box) . I would use it a lot (water courses and river are somewhat fractals and need special scale dependent symbols). I think we should share that with Martin Dobias who is thinking a legend refactoring. Here we have a scale dependent legend. I other use cases, we have data dependent legend. So IMHO, QGIS really need now another type of legend, ie a legend generated on the base of the currently rendered features. Data and expressions, and scale dependent symbol are not predicatable, so we probably need to render the datas, and then render a legend (except for determinist predefined legends) Cheers Régis
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