Hello, I've just noticed that the rulers and perspective grids are always on top of the drawings which can be a bit confusing especially if you use a lot of them. A easy solution for this problem could be a simple transparency slider for these tools to make them less dominant on the canvas. Another but more complicated solution could be a special layer for perspective grids, rulers and guidelines. This solution is used in some vector graphic and desktop publishing programs. The advantage of this is that it's possible to draw over the guidelines if you put a normal paint layer on top. You could also put them between some layers. So can have your guidelines over the background of your image but under some other layers you are currently working on. Also you can enable or disable the visibility of entire rulers/perspective grid groups with the layer manager.
Thanks for reporting! This should be easy to do, so I'm marking it as a junior job and confirming.
I just did a commit that added a color selector and an opacity slider for the assistants. It will be in Krita 4.0
Git commit 5077699bbc608c9df8923d63a64c912b1b0ba5a0 by Scott Petrovic. Committed on 07/12/2017 at 18:53. Pushed by scottpetrovic into branch 'master'. D9071 Add custom opacity and color for assistants CCMAIL:kimageshop@kde.org master will need a clean build as many files have changed. There was also other refactoring and fixing how the assistants are displayed M +4 -0 libs/ui/kis_painting_assistants_decoration.h https://commits.kde.org/krita/5077699bbc608c9df8923d63a64c912b1b0ba5a0