Re: picking question results

[Dieter@isodraw.de (Dieter Weidenbrueck)]

Lofton,

one more comment:

Of course the usage of "non-transparent" is inaccurate and should be
improved. We might find alpha-transparency anywhere in the file.

Dieter

----- Original Message -----
From: "Lofton Henderson" <lofton@rockynet.com>
To: "Dieter" <dieter@itedo.com>; <cgmopen-members@lists.oasis-open.org>
Sent: Friday, June 01, 2001 3:33 PM
Subject: Re: picking question results


> Dieter,
>
> I don't think you're misunderstanding.
>
> Current score:
>
> 3 implementations will pick the hollow/empty;
> 2 will not.
>
> I don't really care how it is resolved.  But it needs quick resolution.
>
> Any further input?
>
> Does anyone who does pick hollow/empty have strong feelings against
> changing?  (Basically, you'd have to treat it like a line object in your
> pick candidates list.)
>
> -Lofton.
>
>
> At 12:23 PM 6/1/01 +0200, Dieter Weidenbrueck wrote:
> >Lofton,
> >
> >I looked at the standard and at our implementation, but probably I'm
missing
> >something here.
> >
> >1. Case: Circle with "hollow" fill , fill color is black
> >We produce from that a circle element that has no fill but an edge
contour.
> >Obviously "hollow" suggests that you can look through the center of the
> >circle. A click into this "hollow" area does NOT hit the circle in our
case,
> >and I believe it shouldn't.
> >Example:
> >Draw another element behind the circle that becomes visible inside the
> >hollow area of the circle. A click on this element would not hit the
circle
> >but the element behind, thus being consistent with the "hollow" visual
> >appearance.
> >
> >2. Case: Circle with "empty" fill but edge
> >Again we produce a circle that has no fill but an edge contour.
> >The behavior is identical to the one described above, and all comments
> >apply.
> >
> >In both cases if the fill style is set to "solid" and the fill color to
> >white we will associate a click with this circle. However, this will look
> >very different visually if another element is behind the circle.
> >
> >Since everybody is moving so strongly into the opposite direction I
assume
> >that I misunderstand something here?
> >
> >Dieter
> >
> >
> >----- Original Message -----
> >From: "Lofton Henderson" <lofton@rockynet.com>
> >To: <cgmopen-members@lists.oasis-open.org>
> >Sent: Thursday, May 31, 2001 6:30 PM
> >Subject: picking question results
> >
> >
> > > CGM Open members --
> > >
> > > I had 4 responses to the question about picking a hollow or empty
> > > filled-area object with a visible border or edge.  3 agreed that,
"yes", a
> > > mouse click in the interior picks the object.
> > >
> > > One wrote:
> > >
> > > >We pick only on the border of empty or hollow filled primitives, i.e.
> > > >rectangles,
> > > >polygonal fill areas, circles, closed arcs...
> > > >
> > > >It is actually simpler (programming wise) and faster (computing time)
to
> > > >make the whole
> > > >interior hot especially for circles and arcs. I would be interested
to
> > > >hear what others
> > > >are doing.  For the sake of consistency in viewers, we may change to
> >conform.
> > >
> > > Therefore, I interpret that there is unanimous approval for the "yes"
> > > interpretation.  We will clarify the offending (vague) language which
> > > raised the question.
> > >
> > > Regards,
> > > Lofton.
> > >
> > >
> > > ------------------------------------------------------------------
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>
> *******************
> Lofton Henderson
> 1919 Fourteenth St., #604
> Boulder, CO   80302
>
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> Email:  lofton@rockynet.com
> *******************
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>
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