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Date:	Sat, 04 Jun 2016 20:01:58 +0100
From:	"M. J. Everitt (m DOT j DOT everitt AT iee DOT org) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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To:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] pcb: ARC bug
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On 04/06/16 14:07, gedau AT igor2 DOT repo DOT hu wrote:
> Hi all,
>
> while testing pcb-rnd, khazakar has found an interesting bug that is
> present in recent versions of PCB mainline too. A minimal example pcb
> can be found at:
>
> http://igor2.repo.hu/tmp/arcbug.pcb.gz
>
> It features two arcs: the one on the component side has both ends
> within the drawing area and works properly when moved or resized. The
> one on the solder side gets jumpy when moved.
>
> Reproduce from scratch: draw an arc starting it at the top-left corner
> making it as big as the editor permits.
>
> The problem seems to be that PCB tries to keep both endpoints within
> bounds and when this is not possible, it does something strange.
>
> Proposed fix:
>
> - let the user override clipping with a modifier (e.g. the shift key)
> - or relax the clipping: if the size of the area of the bounding box
> of the arc is at least 1/3 of the area of the drawing, stop clipping
> - maybe both of the above
>
> Rationale: PCB doesn't worry too much about objects falling beyond the
> drawing area most of the time, perhaps it shouldn't in this case
> either. Worst case 99% of the arc will be off-drawing so it will be
> difficult to grab it by the tiny portion still accessible in drawing
> space. But even then the drawing area can be enlarged or the object
> can be removed with a text editor so nothing really breaks if the user
> can move such huge arcs freely.
>
> Regards,
>
> Igor2
I've lost PCB elements off the drawing area by accident before .. the
solution of simply enlarging the area, moving items, then re-adjusting
seems perfectly reasonable to me. Now what might be useful where
restriction is concerned, is to discourage PCB from placing either
components or selections (taking into account selection extents) outside
of the working area, or at least requiring a modifier (eg.
Shift/Ctrl/Alt) in order to do so. I guess consistency here is probably
the driving force!

MJE


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