Polygons

[Ian McKnight]

I would hazard a guess that the fill area needs to be bounded by a line. If
a line is missing the fill routine can't determine where the edge of the
fill is and so fails, leaving the grc empty. I may be completely wrong on
this but it seems logical.

Not much help I know but if you want to emphasise the edge of the bar could
the special effects settings help? I haven't tried his but have your bar as
a filled grc with out an edge and play with internal, external glows and
shadows etc to emphasise the outline.

Regards

Ian

On Sun, 4 Apr 2021, 19:10 Terence Heaford via use-livecode, <
use-livecode at lists.runrev.com> wrote:

> OK, I have changed your script by adding these lines to the mouseUp handler
>
> set the backgroundColor of grc "myPoly" to red
>
> set the forecolor of grc "myPoly" to blue
>
>
> Now if you switch the lines on/off you will see that the fill does not
> work without all lines.
>
> Not sure what this means exactly.
>
> Thanks
>
> Terry
>
>
> > On 4 Apr 2021, at 18:43, Ian McKnight via use-livecode <
> use-livecode at lists.runrev.com> wrote:
> >
> > I have to say that I'm not seeing this.
> > I seem to remember that graphics can't show a fill unless all lines are
> > visible.
> > As a test I created a graphic called "myPoly" .
> > I placed a checkbox called "showSides" (and removed its script)
> > in a button I placed the following script:
> >
> >
> -----------------------------------------------------------------------------
> >
> > *on* mouseUp
> >
> > *-- points for a 100 unit square with 4 sides visible*
> >
> > *put* "50,50" &cr& "150,50" &cr& "150,150" &cr& "50,150" &cr& "50,50" &cr
> > into tPointsFor4Lines
> >
> > *-- points for a 100 unit square with alternate sides visible*
> >
> > *put* "50,50" &cr& "150,50" &cr& cr& "150,150" &cr& "50,150" &cr &cr&
> > "50,50" &cr into tPointsFor2Lines
> >
> > *set* the opaque of grc "myPoly" to true *-- ensures fill is visible*
> >
> > *if* the hilite of btn "showSides" is true
> >
> > *then*
> >
> > *set* the points of grc "myPoly" to tPointsFor4Lines *-- all sides
> showing*
> >
> > *else*
> >
> > *set* the points of grc "myPoly" to tPointsFor2Lines *-- alternate sides
> > showing*
> >
> > *end* *if*
> >
> > *end* mouseUp
> >
> >
> ----------------------------------------------------------------------------------
> >
> > When you run this and flip between 4 and 2 sides its showing the square
> is
> > drawn correctly,
> >
> > 4 sides visible - filled and 2 sides visible - not filled
> >
> > If you check the Inspector for the graphic the opaque property hasn't
> > changed.
> >
> > The only way I can think to overcome this is to create another graphic -
> > the same size as your first one, place it underneath your graphic and
> group
> > them together. Then when all sides are visible you can make this
> background
> > graphic invisible and when sides are 'missing' make it visible again to
> > provide the fill or simply leave it visible since it won't be seen under
> > your original graphic. When sides 'disappear' and the fill disappears
> this
> > graphic will then provide your fill.
> >
> >
> > Hope this is of some help
> >
> > Regards
> >
> > Ian
> >
> >
> > On Sun, 4 Apr 2021 at 18:04, Terence Heaford via use-livecode <
> > use-livecode at lists.runrev.com> wrote:
> >
> >> When you do this it appears to affect the fill settings. I lose the fill
> >> where there are no lines and the closure of the points also moves.
> >>
> >> I can’t believe it’s LC, it must be me. A simple script example would be
> >> useful if you have the time.
> >>
> >> A square, that’s easy, that has the side lines missing and is filled
> with
> >> a colour.
> >>
> >> Regards
> >>
> >> Terry
> >>
> >>
> >>> On 4 Apr 2021, at 15:39, Ian McKnight via use-livecode <
> >> use-livecode at lists.runrev.com> wrote:
> >>>
> >>> By a space I mean a blank line!
> >>> Ian
> >>>
> >>> On Sun, 4 Apr 2021 at 15:39, Ian McKnight <iangmcknight at gmail.com
> >> <mailto:iangmcknight at gmail.com>> wrote:
> >>>
> >>>> Hi
> >>>> Put a space in-between the points where you want  the line in not be
> >>>> drawn. The shape is still constructed but with missing sides.
> >>>>
> >>>> Ian
> >>>>
> >>>> On Sun, 4 Apr 2021 at 15:02, Terence Heaford via use-livecode <
> >>>> use-livecode at lists.runrev.com> wrote:
> >>>>
> >>>>> Thanks for that, clearly understood.
> >>>>>
> >>>>> To expand on the original question. If you have a hexagon, is it
> >>>>> possible  to only draw lines on sides 1,3,5,6 and no lines on sides
> >> 2,4.
> >>>>>
> >>>>> Thanks Terry
> >>>>>
> >>>>>> On 4 Apr 2021, at 12:43, Ian McKnight via use-livecode <
> >>>>> use-livecode at lists.runrev.com> wrote:
> >>>>>>
> >>>>>> Yes. Polygons use a list of 4 points to describe a triangle. The
> >> first
> >>>>> and
> >>>>>> last are the co-ords of the same vertex to ensure closure.
> >>>>>> If the last point is left out then the line between the last vertex
> >> and
> >>>>> the
> >>>>>> first vertex is not drawn.
> >>>>>> So make sure that your list of points doesn't begin with the right
> >> angle
> >>>>>> vertex and you're good to go.
> >>>>>>
> >>>>>> Ian
> >>>>>>
> >>>>>>
> >>>>>>> On Sun, 4 Apr 2021 at 12:12, Terence Heaford via use-livecode <
> >>>>>>> use-livecode at lists.runrev.com> wrote:
> >>>>>>>
> >>>>>>> If I draw a shape using a polygon, as an example assume a right
> >> angled
> >>>>>>> triangle.
> >>>>>>>
> >>>>>>> Is it possible to hide the line between the points that make up the
> >>>>>>> hypotenuse?
> >>>>>>>
> >>>>>>> Thanks
> >>>>>>>
> >>>>>>> Terry
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>> _______________________________________________
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> >>>>>>>
> >>>>>>
> >>>>>>
> >>>>>> --
> >>>>>> Regards
> >>>>>>
> >>>>>>
> >>>>>> Ian McKnight
> >>>>>>
> >>>>>> iangmcknight at gmail.com
> >>>>>> =======================
> >>>>>> _______________________________________________
> >>>>>> use-livecode mailing list
> >>>>>> use-livecode at lists.runrev.com
> >>>>>> Please visit this url to subscribe, unsubscribe and manage your
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> >>>>>
> >>>>> _______________________________________________
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> >>>>>
> >>>>
> >>>>
> >>>> --
> >>>> Regards
> >>>>
> >>>>
> >>>> Ian McKnight
> >>>>
> >>>> iangmcknight at gmail.com
> >>>> =======================
> >>>>
> >>>
> >>>
> >>> --
> >>> Regards
> >>>
> >>>
> >>> Ian McKnight
> >>>
> >>> iangmcknight at gmail.com <mailto:iangmcknight at gmail.com>
> >>> =======================
> >>> _______________________________________________
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> >>> Please visit this url to subscribe, unsubscribe and manage your
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> >> http://lists.runrev.com/mailman/listinfo/use-livecode>
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> >>
> >
> >
> > --
> > Regards
> >
> >
> > Ian McKnight
> >
> > iangmcknight at gmail.com
> > =======================
> > _______________________________________________
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> > use-livecode at lists.runrev.com
> > Please visit this url to subscribe, unsubscribe and manage your
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