Hello everybody,
I'm still pretty new to Krita, and maybe it's because of that that i did not yet find out how to do this, so: I wanted to predefine a triangle with 3 equally long sides, and i knew such features are in Krita because i used this process of predefining with the ellipsoid tool already to generate predefined circles. Now, is it possible to do that with polygons too? I couldn't find a triangle tool, so i just tried the settings of the polygon tool, but couldn't find anything there. If this is not yet possible, here's a suggestion what it could look like:
1. A blank where you can select how many corners your polygon is supposed to have.
2. Further blanks where you can insert the lengths of the lines
and/or: 3. Further blanks where you can insert the concrete angles of the corners.
Those should offer more blanks the more corners you select for your polygon.
So, did i just miss a similar option of predefining polygons or is something not yet implemented in Krita?
PS: If this post belongs somewhere else, i'm sorry.

This sounds like a post for the Krita Extensions section: viewforum.php?f=156

One practical solution for you would be to have a 'model' file containing vector polygons of various types, perhaps triangles on one layer, pentagons on another layer, etc. You could have this model file open at the same time as your 'working' file and copy/paste polygons from the model file to the working file, as needed. Using vector objects means you can then scale/tansform them with no loss of detail or resolution.

If you use the grid and snap-to-grid, it's much easier to construct the polygons as you want them.

Sorry, but I think what he says is something like "Regular Polygon"?
https://en.wikipedia.org/wiki/Regular_polygon

which means polygons that have
1. equal inner corners, and
2. the inner corner sum of "(n-2) x 180" degree
i.e. equilateral triangle, square, uniform hexagon, uniform pentagon, etc.

(yeah, i am looking for this as well, so why i am here )

If he means this, I hope krita can support this quite basic feature asap as well, instead of making it a responsibility of extension...

As i remember, photoshop and inkscape both have simple tool to drag a regular polygon
ref: https://www.youtube.com/watch?v=9vSbxxoAek4
ref: https://www.youtube.com/watch?v=pBLy9KDPMHk

Using Inkscape, I've just made an equilateral/regular triangle, quadrilateral, pentagon, hexagon, heptagon and octogon. I could have gone further but I started to get nervous. Then I copied and pasted them individually to a vector layer in Krita. Oh, the fun that can be had with a computer and the right software.