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Subject: Re: [geda-user] how to you actually draw a polygon?
From: "Peter Clifton (petercjclifton AT googlemail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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On 6 Mar 2016 16:20, "Kai-Martin Knaak" <kmk AT familieknaak DOT de> wrote:

> A combination of 45=C2=B0 and 90=C2=B0 lines should always be able to clo=
se the
> polygon.

This is true, but given a fine grid, it isn't always easy to get the
vertices to line up as you might want to achieve that.

> In a perfect GUI the cursor would snap to the start vertex.

Not enough, unless we added some means to create two edge segments at once
(like with tracking).... it just may not be legal to insert that last edge
between the last clicked vertex and the start vertex.

One idea which might work (or might be horrid), is snapping such that the
crosshair lines (which can be 45 degrees too) land on some point of
interest, such as the start vertex. Not sure if this would work or not...
There may be too many potential snap points.

Like all
> snapping, the sensitive radius should be given in screen coordinates
> (rather then real world dimensions).

Indeed.

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<p dir=3D"ltr"><br>
On 6 Mar 2016 16:20, &quot;Kai-Martin Knaak&quot; &lt;<a href=3D"mailto:kmk=
@familieknaak.de">kmk AT familieknaak DOT de</a>&gt; wrote:</p>
<p dir=3D"ltr">&gt; A combination of 45=C2=B0 and 90=C2=B0 lines should alw=
ays be able to close the<br>
&gt; polygon.</p>
<p dir=3D"ltr">This is true, but given a fine grid, it isn&#39;t always eas=
y to get the vertices to line up as you might want to achieve that.</p>
<p dir=3D"ltr">&gt; In a perfect GUI the cursor would snap to the start ver=
tex.</p>
<p dir=3D"ltr">Not enough, unless we added some means to create two edge se=
gments at once (like with tracking).... it just may not be legal to insert =
that last edge between the last clicked vertex and the start vertex.</p>
<p dir=3D"ltr">One idea which might work (or might be horrid), is snapping =
such that the crosshair lines (which can be 45 degrees too) land on some po=
int of interest, such as the start vertex. Not sure if this would work or n=
ot... There may be too many potential snap points.</p>
<p dir=3D"ltr"> Like all<br>
&gt; snapping, the sensitive radius should be given in screen coordinates<b=
r>
&gt; (rather then real world dimensions).</p>
<p dir=3D"ltr">Indeed.<br>
</p>

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