Properly definable color ranges. Let's say I want to color values below 0 in blue shades, values above 0 as red shades. Pretty much none of the libraries allow

Properly definable color ranges. Let's say I want to color values below 0 in blue shades, values above 0 as red shades. Pretty much none of the libraries allow anything like that (unless you jump through hoops and write ugly hacks).