Re: [Gnuplot-info] unicode points are shifted

[Dmitry <unk...@gm...>]

Hello Norwid,
thank you for your reply. The script I attached is just an example to 
demonstrate the problem.
My actual plot is much more complicated, I have attached a .pdf example 
of what I'm actually plotting.
Basically I have two datasets: one should be plotted with empty gray 
points, and the second dataset should be  plotted with filled colored 
points.
Since I have a lot of data to plot, gnuplot just does not have enough 
pointtypes of desired properties, so I decided to try unicode.
So far I ended up using
> plot [0:50] "battery.dat" with xyerrorbars pt -1 notitle ,\
> "battery.dat" using 1:2:("▢") with labels offset 0, character 0.035 
> notitle
, where I adjust offset manually for each pointtype (unicode char) by 
try and error method. That's how I plotted the attached pdf.
But it's far from ideal, since if decide to change the size of the plot, 
all offsets are required to be readjusted.
I think that it would be great if gnuplot could offer more pointtypes, 
since adding unicode points is a lot of pain because each character has 
it's own shift.

Or may be there are and easy way that I don't know about? That would be 
great.
Thanks!


On 14.02.2025 14:16, Norwid Behrnd via gnuplot-info wrote:
> @Dmitry Preface: I'm not yet convinced a character pointtype by `"\U+25A2"`
> improves the default tools available if one wants to indicate the points'
> location by a box.  The difference is gnuplot's box does not use rounded
> corners -- is this a requirement on your side?  Because depending on font and
> specific glyph, what is the origin of coordinates of its bounding box (in
> LaTeX's parlance) gnuplot uses a reference to put the glyph on the canvas --
> is it in one of the bounding box' corners, or its center (then affected by the
> glyph's height and width)?[1]  Would using the "rounded square" render the plot
> much easier to read, than gnuplot's box?  Perhaps the script shared by you used
> `"\U+25A2"` as a place holder for a different printable object.
>
> My suggest is to use `pt 4` within the pdfcairo terminal to write an
> intermediate .pdf subsequently converted e.g., by David Barton's pdf2svg[2]
> in lines of `pdf2svg test.pdf out.svg`.  As an illustration, I edited your
> script's header and last line to
>
> ``` test.spt
> set terminal pdfcairo enhanced font 'DejaVuSans,12'
> set output "test.pdf"
>
> set style data lines
> set title "error represented by xyerrorbars"
> set xlabel "Resistance [Ohm]"
> set ylabel "Power [W]"
> n(x)=1.53**2*x/(5.67+x)**2
> NO_ANIMATION = 1
> unset pointintervalbox
> #plot [0:50] "battery.dat" t "Power" with xyerrorbars pt "\U+25A1" pointsize
> 44 lw 2 lc "red", n(x) t "Theory" w lines #plot "battery.dat" t "Power" with
> points pt "\U+25A1" pointsize 44 lw 2 lc "red"
>
> plot [0:50] "battery.dat" with xyerrorbars pt -1 notitle ,\
> "battery.dat" t "Power" with points pt 4 pointsize 1 lw 2 lc "red"
> ```
>
> which works reasonably well (gnuplot 6.0.2).
>
> [1] see for instance `x` and `V` in the accepted answer by `theozh` (May 26,
> 2019) https://stackoverflow.com/questions/56313642/change-the-color-of-a-character-pointtype-in-gnuplot
> [2] http://cityinthesky.co.uk/opensource/pdf2svg/
>
>
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