Hi, I'm using Inkscape to make interfaces with very small elements.
I do find myself putting a lot of time and effort to produce "pixel-perfect" graphics.
What I do find wrong with Inkscape is that it shifts and scale graphics to non even values without apparent reason.
See this very simple example:

I can't reproduce that.

So you start with an ellipse shown in the first frame. Then you do nothing else but type "127" into height field. After you press enter the Y value changes and so does the H value?

Exactly!
This happens almost constantly, so I have to correct various coordinates each time I made a change.
I don't know if matters, but I'm using development builds.

Check out this bug https://bugs.launchpad.net/inkscape/+bug/210145

prkos wrote:Check out this bug https://bugs.launchpad.net/inkscape/+bug/210145

Yep, this seems the case. I hope they will squish it up soon, it's annoying.

That bug is about very small rounding errors; the errors you see are in fact quite large. Are you using a stroke? I cannot judge this for sure from your picture, because it could have the same color as the fill. Please remove this stroke.

Next, on the tools tab in the preferences, select "visual bounding box" if it hasn't already been selected. If I'm correct, the values you enter are for either for the visual or geometric bounding box, depending on what you've selected in the preferences. After entering those values though, it will always display the dimension of the visual bounding box, regardless of the bounding box setting.

Regards,

Diederik

Raising Numeric Precision seems to solve the problem, or at least minimize it.
I must say that I did lower that value to 4 and -4 hoping that this would help rounding coordinates to "friendly" numbers.
I was completely wrong.