[pstricks] pst-slpe

[Werner Grundlingh]

In order to obtain a slope color in a different direction, you can specify
the key-value slopeangle=<angle>, where <angle> is given in degrees.
  left-to-right -> slopeangle=0 (default)
  right-to-left -> slopeangle=180
  top-to-bottom -> slopeangle=-90
  bottom-to-top -> slopeangle=90

So, in your example, for a left-to-right gradient fill, use
  \pscustom[fillstyle=slope,**linestyle=none,fading,**
slopebegin=white,slopeend=red,slopeangle=180]**{...}

Hope this helps,
Werner

On Sun, Nov 13, 2011 at 08:52, Cyrille Piatecki <
cyrille.piatecki at univ-orleans.fr> wrote:

> In pst-slpe we can find a large variety of method for coloring an area.
> But slope color from the left to the right. It will be usefull to have one
> for coloring from the right to the left, one from the bottom to the top and
> one from the top to the botom.
>
> I need the two last for this pictures
>
> \begin{center}
> \begin{pspicture}(0,0)(14,5)
> \psgrid
> \psline{<->}(4,4.5)(4,.5)(10.**2,.5)
> %\psline[linestyle=dashed](4,**2.5)(7,2.5)(7,.5)
> \rput(10,4){$O_n$}
> \rput(10,1){$D_n$}
> \rput(10.4,.5){$q$}
> \rput(7,.15){$q^\star$}
> \rput(3.8,4.5){$p$}
> \rput(3.8,1.4){$p_t$}
> \psline[linestyle=dashed](4,1.**4)(4.9,1.4)
> \rput(3.8,2.5){$p^\star$}
> \rput(7,.15){$q^\star$}
> \psset{origin={4,.5}}
> \psplot[algebraic,linecolor=**blue,linewidth=1.4pt]{0}{6}{-.**41 * x -
> 0.03*x^2 + 3.5}
> \psplot[algebraic,linecolor=**red,linewidth=1.4pt]{0}{6}{.4 * x +
> 0.035*x^2 + .5}
> \pscircle[fillstyle=solid,**fillcolor=green,linestyle=**none](3,2.){3pt}
> \pscustom[fillstyle=slope,**linestyle=none,fading,**
> slopebegin=white,slopeend=red]**{
> \psplot[algebraic]{1.1}{2}{.4 * x + 0.035*x^2 + .5}
> \psplot[algebraic]{3}{4.7}{-.**41 * x - 0.03*x^2 + 3.5}
> \lineto(0.8,0.9)}
>
> \psplot[algebraic,linecolor=**blue,linewidth=1.4pt]{0}{6}{-.**41 * x -
> 0.03*x^2 + 3.5}
> \psplot[algebraic,linecolor=**red,linewidth=1.4pt]{0}{6}{.4 * x +
> 0.035*x^2 + .5}
> \pscircle[fillstyle=solid,**fillcolor=green,linestyle=**none](3,2.){3pt}
> \end{pspicture}
> \end{center}
>
> (For herbert Voss, I have not taken time to thanks for ma last question
> and the deawing of a fonction with the intersection of a plane and the
> projection of the function because I use the very nice Bakoma and on my
> computer your code is not shown)
>
> Thanks
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