[Libreoffice-bugs] [Bug 138272] New: No snap when drawing circular arcs from centre point

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=138272

            Bug ID: 138272
           Summary: No snap when drawing circular arcs from centre point
           Product: LibreOffice
           Version: 7.0.3.1 release
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: medium
         Component: Draw
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: pja1728 at gmail.com

Description:
I want to draw a circular arc with centre and radius defined by grid points.
Alt is needed to centre, but then overrides snap.
Using Alt for both purposes creates a conflict in this context.

Steps to Reproduce:
1.Set snap to grid
2.Draw a horizontal line with end points at grid points
3.Place cursor at left end of line, left click and hold Alt-Shift
4.Move cursor to right end of line. Arc radius is created, but it is impossible
to snap to end of line or grid point (the same point). So the radius in almost
certain to be inaccurate.
5. Release Shift and left click, maintain Alt and draw arc

Actual Results:
Arc is drawn, but not accurately.

There is a similar issue with the sector tool.

Expected Results:
Accurate circular arc of fixed radius centred on initial point set by the grid.


Reproducible: Always


User Profile Reset: No


OpenGL enabled: Yes

Additional Info:
This is really a feature request. At present Alt does 2 things which interfere.
It centres the arc (and most other figures) at the first click, but it also
overrides snap to grid. While it is possible to uncheck snap to grid and use
Alt to snap, that then means the initial (centre) point is not snapped to grid.
Either way the objective of having an arc centred on a point with a predefined
radius is not possible, except inaccurately by sight.

I would have thought that most users of the arc tool would want it centred on
the first point and not dragged out of position, so one solution would be to
make the arc tool centred by default. The steps above even if a slightly
inaccurate result is acceptable are still very complicated and awkward.

Another solution would be to use a different modifying key for snap and for
centre. Not being able to operate one without the other is a severe limitation.

Finally I am only making the request because in almost all other respects Draw
is a wonderful tool!

Another solution

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