Add legend type/properties for map composer: gradient, horizontal, with label offset

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Author Name: Juraj Betak (@jurajbetak) Original Redmine Issue: 13445

Redmine category:unknown

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Please, see attached image to understand the thread: A - definition of thresholds for the color legend B - visualisation of color legend in TOC C - example what I am capable to construct via legend properties to map composer

My wish: D - vertical color gradient with correct position of values (see offset next to the interval threshold), no outline forthe interval colors E - represents D, transformed to horizontal position

I do not know, how much work it is to implement features for creating such legend, but that would be really helpful.

I work with various kinds of gridded data for 15+ years on daily basis; E option would cover 90% of my needs for legend. It is logically correct and compact to save space in the layout. A lot of "unGIS" software/libs (like Matplotlib+Basemap) offer such legend type.

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• gradient-legend.png (Juraj Betak)

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• easy_fix was configured as 0

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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• category_id was configured as Unknown