Re: [Gnuplot-info] rotate labels by data column

[Grothausmann, R. Dr. <gro...@mh...>]

Many thanks theozh! The way of assigning values from data to variables through 
empty plot commands was completely new to me. It works great for wxt 
(https://github.com/romangrothausmann/KursgleicheNG/blob/8c9eb5c69e77da7e9102beefa8c139d409717719/windrose.gp), 
but even though SVG supports rotated labels, the "empty plots" cause SVG 
end-tags for groups that have no start-tag which results in invalid SVGs. Is 
that expected?

On 02/08/16 23:04, theozh wrote:
> well, you could do it with setting labels...
>
> However, the example below is a bit a cumbersome workaround, but it
> seems to do the job in a wxt terminal.
> - the first data column is used to define the position
> - the second data column gives the label text
> - the third data column defines the rotation
> The first 3 plot command are not plotting anything but extracting
> numbers and text into the variables a,b,c.
>
> Hope this helps...
> Maybe there is a more elegant version?
>
>
> reset
>
> $Data <<EOD
> 1 one -30
> 2 two -60
> 3 three -90
> 4 four -120
> 5 five -150
> 6 six -180
> 7 seven -210
> 8 eight -240
> 9 nine -270
> 10 ten -300
> 11 eleven -330
> 12 twelve -360
> EOD
>
> set xrange [0:10]
> set yrange [0:10]
> set size square
> unset xtics
> unset ytics
> n = 12.   # . for floating point division
> set angles degrees
> do for [i=1:n] {
>   plot $Data u 1:(a=$1,0/0) every 1:1:i-2:0:i-1:0 notitle;
>   plot $Data u 1:(b=stringcolumn(2),0/0) every 1:1:i-2:0:i-1:0 notitle;
>   plot $Data u 1:(c=$3,0/0) every 1:1:i-1:0:i-1:0 notitle;
>   set label i center at (5+5*cos(-i/n*360+90)),(5+5*sin(-i/n*360+90))\
> sprintf("%s",b) rotate by c font "Arial,20";
>   }
>
>   plot $Data u 1:1 notitle     # or whatever else you need to plot
>