Re: A key sample for pm3d surfaces?

[Ethan A M. <sf...@us...>]

On Thursday, 07 July, 2016 12:19:21 Daniel J Sebald wrote:
> I'm trying to add a key sample for a pm3d surface.  I know there is the 
> color box and all, but it seems odd that there can be a title entry in 
> the key but no sample.  I can sort of kludge a solution by leaving the 
> surface title empty and then create a bogus line with NaN's that will 
> contain the sample and title, linewidth 8.  For the Qt terminal, the 
> default is rounded line ends so the key sample at linewidth 8 is round.
> 
> Basically, it would be nice to have a sample entry for surface similar 
> in appearance to the filledcurve or candlestick of 2D plots.  I wonder 
> if it would make sense to have a "sample" descriptor in plot/splot lines 
> similar to the "title" descriptor.

The problem with using a colored key sample for anything with pm3d
coloring (surfaces or anything else) is that it is not clear how to
choose a color for the sample.   You might for example have 3 plots
in a single figure using the same pm3d palette, one plot predominantly 
green, one predominantly blue, and one predominantly yellow.
You would like the key to match, but how would the program know this?

	Ethan