[pstricks] Shading the area between two \listplots

[Herbert Voss]

Alan Ristow wrote:

> I am plotting two curves using the psgraph environment and I would 
> like to shade the area between the curves. I feel certain that I have 
> done this before, but I cannot figure out how. At any rate, I have a 
> minimal example below that produces two graphs: One with the two lines 
> and no shading, and one with my (rotten) attempt to shade the area 
> between the lines.
>
> The problem appears to be that I cannot draw a closed path using 
> \listplot. I suppose that a workaround might be to draw the data from 
> two different files, plotting the second set of data in reverse order 
> from the first. However, I would prefer to avoid that, if possible. Is 
> this possible?


>   % Shade the area between lines
>   \begin{psgraph}[axesstyle=frame,ticklinestyle=dotted,xticksize=0 10,%
>       yticksize=0 10](0,0)(10,10){1.75in}{1.1in}%
>     \readdata{\data}{data.dat}%
>     \pscustom[fillstyle=solid,fillcolor=gray]{%
>       \listplot[plotNo=1,plotNoMax=2]{\data}%
>       \listplot[plotNo=2,plotNoMax=2]{\data}%
>     }%
>   \end{psgraph}
> \end{document}

  % Shade the area between lines
  \begin{psgraph}[axesstyle=frame](0,0)(10,10){1.75in}{1.1in}%
    \readdata{\data}{data.dat}%
    \pscustom[fillstyle=solid,fillcolor=gray]{%
      \psline(0,0)(0,1)      % dummy lines for filling
      \listplot[plotNo=2,plotNoMax=2]{\data}%
      \psline(10,1)(10,0)}   % dummy lines for filling
    \pscustom[fillstyle=solid,fillcolor=white]{%
      \psline(0,0)(0,1)      % dummy lines for filling
      \listplot[plotNo=1,plotNoMax=2]{\data}%
      \psline(10,1)(10,0)}   % dummy lines for filling
    \psgrid[griddots=5,gridlabels=0pt,subgriddiv=0,gridcolor=gray]
  \end{psgraph}


Herbert