Re: [Gnuplot-info] using hypertext labels with multiple datasets and a key/legend

[Ethan A M. <EAM...@gm...>]

On Tuesday, 03 February 2015 05:37:50 PM Kevin Klein wrote:
> I am trying to use Gnuplot 5's hypertext labels in conjunction with
> multiple datasets on the same plot and am finding that when I add the
> hypertext labels it removes the identifying color markings in my key.
> 
> The following works fine and produces a plot with a legend/key in the upper
> right with a blue box next to v5 and a green box next to v6:
> 
> set term svg size 600,400 dynamic mousing name "test"
> set output "test.svg"
> plot "data_file.txt" using 1:2 title 'v5' w point pt 5 lc rgb 'blue',
> "data_file.txt" using 4:5 title 'v6' w point pt 5 lc rgb 'green'
> 
> Now I want to recreate the same plot with some hypertext labels:
> 
> set term svg size 600,400 dynamic mousing name "test"
> set output "test.svg"
> plot "data_file.txt" using 1:2:3 title 'v5' w labels hypertext point pt 5
> lc rgb 'blue', "data_file.txt" using 4:5:6 title 'v6' w labels hypertext
> point pt 5 lc rgb 'green'
> 
> The plot is created and the hypertext labels appear when I mouse over the
> data points, but my legend/key in the upper right no longer contains a blue
> and green box next to the dataset titles.  It is just blank white where the
> two separate color points should be.  Why is this happening?


Each plot style places a corresponding symbol in the key together with 
its title.  "with lines" places a line, "with boxes" places a box,
"with points" places a point, and so on.  "with labels" does not place
a separate symbol because its primary feauture text and the corresponding
title already representes text.

So your plot "with points" showed a point in the key.
Your plot "with labels" did not.  Hypertext is actually not relevant here.

Having said that, I am sympathetic to the idea that a plot using
"with labels point pointtype 7 lc 'green'" could place a filled green
circle next to the plot title just as it does next to each label in
the plot itself.  I suggest you add that as a Feature Request on the
issues tracker on the project's SourceForge page. 

Meanwhile you could use the approach in the hypertext demo
   http://gnuplot.sourceforge.net/demo_svg_5.0/hypertext.html
The data is plotted twice, once "with points" and then again
"with labels hypertext".  The demo doesn't use a key, but if you 
enable the key then the "with points" plot will be represented
by a corresponding point sample in the key.

	Ethan



> 
> 
> Here are the contents of data_file.txt:
> 
> 150            1                 x1   185            1                 x1
> 105            1                 x2   140            1                 x2
> 140            1                 x3   180            1                 x3