Pict2e package arc precision

Aspose.TeX Product Family
1

Hello,

I think I discovered a little problem with the rendering of arcs. In the following image the arc is too long.
Wrong arc.png (18.0 KB)

The same picture has no problem with MikTeX:
good arc.png (17.4 KB)
Here is the code to generate the image:

\setlength{\unitlength}{0.0045779mm}
\begin{picture}(16383,16383)(-8191.0,-8191.0)
\linethickness{0.5pt}
\put(-8191.0,0){\vector(1,0){16383}}
\put(0,-8191.0){\vector(0,1){16383}}
\linethickness{1pt}
\moveto(6553.2,0.0)
\lineto(6131.9,1486.4)
\lineto(5317.8,2967.9)
\lineto(4258.2,4258.2)
\lineto(2967.9,5317.8)
\lineto(1486.4,6131.9)
\lineto(0.0,6553.2)
\lineto(-1486.4,6131.9)
\lineto(-2967.9,5317.8)
\lineto(-4258.2,4258.2)
\lineto(-5317.8,2967.9)
\lineto(-6131.9,1486.4)
\lineto(-6553.2,0.0)
\lineto(-6131.9,-1486.4)
\lineto(-5317.8,-2967.9)
\lineto(-4258.2,-4258.2)
\lineto(-2967.9,-5317.8)
\lineto(-1486.4,-6131.9)
\lineto(0.0,-6553.2)
\lineto(1486.4,-6131.9)
\lineto(2967.9,-5317.8)
\lineto(4258.2,-4258.2)
\lineto(5317.8,-2967.9)
\lineto(6131.9,-1486.4)
\closepath
\strokepath
\put(34.0,-20.3){\circle*{300}}
\put(-6611.702,3944.959){\vector(0.8588,-0.5124){13223.404}}
\put(8192.0,-163.8){\makebox(0,0)[tr]{$M_3$}}
\put(-163.8,8192.0){\makebox(0,0)[tr]{$M_2$}}
\put(6695.6,-3804.3){\makebox(0,0)[bl]{$M$}}
\linethickness{0.5pt}
\arc[0, 329.1770]{3276.6}
\put(-3316.7,914.3){\makebox(0,0)[br]{$\alpha$}}
\end{picture}

I did a lot of tests and I’ve seen even worse results.

Can you look into it?

Thanks,
Stenio

2

Hello,
This is probably a deficiency of the pict2e package of an older version. I can see the same in an older version of MikTeX (with the same pict2e version as in Aspose.TeX): image.png (92.4 KB)

But the good news is that it’s easy to fix. Just remove the line break between the \linethickness{0.5pt} and \arc[0, 329.1770]{3276.6}, or end the \linethickness{0.5pt} line with the comment char %. The arc shift we’re observing is obviously caused by the space char. In general, you should keep in mind that TeX interprets newlines as spaces.

3

Hello Kolod,

That did the trick!

Thank you for your support,
Stenio

4

My pleasure.