[Ipe-discuss] How to draw a circle with one half dashed edge and another half solid edge?

[Tim Hutt]

You have to use the various snapping modes to get it exact. There are
various ways to do it but snap-to-grid is the easiest to understand.

Once you have the whole thing you can group them (Ctrl-G) and move them
around as one object if you need to.

Definitely easier than Tikz!


On Sat, 18 May 2019, 10:25 Nasser M. Abbasi via Ipe-discuss, <
ipe-discuss at lists.science.uu.nl> wrote:

> I tried this. But it did not lookgood. The new ellipse I draw
> behind them (without an edge, just fill) never comes exactly
> the exact right shape to fit well inside those outer two arcs.
>
> I ended doing this in tikz, it was simpler actually.
>
> -------------------
> \documentclass[tikz]{standalone}
> \usetikzlibrary{shapes}
> \begin{document}
> \begin{tikzpicture}
> \def\xR{1.25}; %x radius of ellipse
> \def\yR{0.5};  %y radius of ellipse
> \draw [dashed,domain=0:180] plot ({\xR*cos(\x)}, {\yR*sin(\x)}); %top half
> \draw [domain=-180:0] plot ({\xR*cos(\x)}, {\yR*sin(\x)}); %bottom half
> \fill[gray!20] (0,0) ellipse ({\xR} and {\yR}); %overlay with ellipse
> \end{tikzpicture}
> \end{document}
> -----------------
>
> --Nasser
>
>
> On 5/18/2019 2:27 AM, Alexander Wolff wrote:
> > to me the obvious solution of your problem is to leave the two
> > semi-circles as they are (one dashed, one solid) and to add behind
> > them a filled disk without boundary, no?
> >
> > sascha
> >
> >
> > On 18.05.19 02:27, Nasser M. Abbasi via Ipe-discuss wrote:
> >> I've been struggling with this basic task.
> >>
> >> I simply want to draw a circle, but make the top half
> >> perimeter dashed, and the bottom half perimeter remain
> >> solid as default, and then fill it inside with some color.
> >>
> >> This is what I tried: Draw the top half using menu
> >> option "Circular arc" OK. Now make a copy of it Ok.
> >> Now flip the copy upside down using
> >> "Iplets->Goodies->Mirror vertically" OK. Now change the
> >> top half to dashed OK.  Now using the mouse move the top
> >> half to touch the top half arc. OK.
> >>
> >> Now comes the problem. I want to join these two. But when
> >> I select the top and bottom arcs then ->right click->Join path,
> >> the top arc edge suddenly change from dashed back to solid !
> >>
> >> I need to join the path, because I want to fill the circle with
> >> a color and if the path is not joined, then can't do fill with
> >> color.
> >>
> >> This problem actually happen in other shapes. If I want to make
> >> triangle or square with one or two edges dashed, and also want to
> >> fill it inside. can't do it.
> >>
> >> Since once I join path, all edges turn to dashed instead.  I guess
> >> one can't join path with lines that have different styles?
> >>
> >> Any suggestion what else to try?
> >>
> >> IPE 7.2.7 on windows 10
> >>
> >> Thanks
> >> --Nasser
> >> _______________________________________________
> >> Ipe-discuss mailing list
> >> Ipe-discuss at lists.science.uu.nl
> >> https://mailman.science.uu.nl/mailman/listinfo/ipe-discuss
> >>
> >
>
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