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

Nasser M. Abbasi nma at 12000.org
Sat May 18 11:25:00 CEST 2019

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.

\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


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
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