::
Vorrei colorare l’area sotto il grafico della funzione, insomma il trapezoide A_3A_4A_1A_2. Ho seguito con grande fatica il manuale, ma il risultato non è quello voluto. Dove sbaglio?
`\documentclass[12pt]{article}
\usepackage[latin1]{inputenc}
\usepackage[italian]{babel}
\usepackage[a4paper,top=2.5 cm,bottom=2.5 cm,left=2.5 cm,right=2.5 cm,]{geometry}%includehead,includefoot
\usepackage{amssymb,latexsym}
\usepackage{amsmath}
\usepackage{mathrsfs}
\usepackage{mathabx}
\usepackage{xypic}
\usepackage{pst-plot}
\usepackage{pstricks,pstricks-add,pst-math,pst-xkey,pst-func,pst-3dplot}
\usepackage{pst-eucl}
\usepackage{graphicx}
\usepackage{color}
\usepackage{cancel}
\usepackage{float}
\usepackage[format=hang,labelfont={bf},labelsep=quad]{caption}
\usepackage{pifont}
\usepackage{dsfont}
\usepackage{fancyhdr}
\usepackage{pict2e}
\pagestyle{fancy}
\lhead{}
\chead{}
\rhead{23 gennaio 2010}
\lfoot{}
\cfoot{\thepage}
\rfoot{}
\newtheorem{theorem}{Teorema}%[section]
\newtheorem{lemma}[theorem]{Lemma}
\newtheorem{corollary}[theorem]{Corollario}
\newtheorem{definition}{Definizione}%[section]
\newtheorem{observation}{Osservazione}%[section]
\newtheorem{example}{Esempio}%[section]
\newtheorem{proposition}[theorem]{Proposizione}
\newtheorem{notation}{Notazione}%[section]
\definecolor{light-blue}{rgb}{0.8,0.85,1}
\definecolor{viola}{rgb}{0.9,0.2,0.9}
\definecolor{marrone}{rgb}{0.75,0.25,0}
\begin{document}
\title{\textbf{\Huge{I limiti}}}
\author{}
\date{}
\maketitle
\section{}
\begin{figure}[H]
\center{\begin{pspicture*}(-3,-3)(11.5,9)
\psset{xunit=1.cm,yunit=1.cm}
\psaxes[labels=none,xAxis=true,yAxis=true,dx=0.7cm,dy=0.7cm,ticks=none]{->}(0,0)(-2.5,-2.5)(11,8)[$x$,-90][$y$,180]
\psplot[algebraic,]{1.5}{8.5}{3*ln(x-1)}
\pstGeonode[PosAngle=-90,dotscale=0.8,PointSymbol={*},PointName=none](4.79,0){P'}
\pstGeonode[PosAngle=180,dotscale=0.8,PointSymbol={*},](0,4){Q}
\pstGeonode[PosAngle=90,dotscale=0.8,PointSymbol={o},](4.79,4){F}
\pstGeonode[PosAngle=90,dotscale=0.8,PointSymbol={none},PointName=none](0,0){O}(1.25,0){L}(0,1.25){M}(1,0){H}
\pstGeonode[PosAngle=90,dotscale=0.8,PointSymbol={*},](6.75,5.25){A_1}
\pstGeonode[PosAngle=180,dotscale=0.8,PointSymbol={*},](3.50,2.75){A_2}
\pstGeonode[PosAngle=90,dotscale=0.8,PointSymbol={*},](3.50,0){A_3}(6.75,0){A_4}
\pstLineAB[linestyle=dashed]{Q}{F}
\pstLineAB[linestyle=dashed]{F}{P'}
\pstTranslation[PosAngle=180]{O}{M}{Q}[R]
\pstTranslation[PosAngle=180]{M}{O}{Q}
\pstTranslation[PosAngle=-90,dotsize=0.1,PointSymbol={*},PointName=none]{O}{H}{P'}
\pstTranslation[PosAngle=-90,dotsize=0.1,PointSymbol={*},PointName=none]{H}{O}{P'}
\pstGeonode[PosAngle=90,dotscale=0.8,PointSymbol={*},](5.79,4.70){A_5}(3.79,3.08){A_6}
\pstGeonode[PosAngle=180,dotscale=0.8,PointSymbol={*},](0,4.70){A_7}(0,3.08){A_8}
\pstLineAB[linestyle=dashed]{A_5}{A_7}
\pstLineAB[linestyle=dashed]{A_8}{A_6}
\pstLineAB[linestyle=dashed]{A_6}{U'}
\pstLineAB[linestyle=dashed]{A_5}{U}
\def\f{\psplot[algebraic,]{1.5}{8.5}{3*ln(x-1)}}
\def\g{\psplot[algebraic,]{-1}{8.5}{2.75}}
\def\h{\psplot[algebraic,]{-1}{8.5}{5.25}}
\def\l{\psplot[algebraic,]{-1}{8.5}{0}}
%\psframe[fillstyle=solid,fillcolor=red,linestyle=none](S)(3.50,5.25)
%\psclip{
%\pscustom[linestyle=none]{
%\moveto(0,2.75)\h\lineto(4,2.75)}
%\pscustom[linestyle=none]{
%\moveto(0,5.25)\g\lineto(4,5.25)}
%}
%\endpsclip
%\psframe[fillstyle=solid,fillcolor=red,linestyle=none](A_2)(A_1)
%\psclip{
%\pscustom[linestyle=none]{
%\moveto(A_3)\h\lineto(A_4)}
%\pscustom[linestyle=none]{
%\moveto(3.50,5.25)\f\lineto(A_1)}
%}
%\endpsclip
\psframe[fillstyle=solid,fillcolor=yellow,linestyle=none](A_3)(A_1)
\psclip{
\pscustom[linestyle=none]{
\moveto(A_3)\f\lineto(A_4)}
}
\endpsclip
\psclip{
\pscustom[linestyle=none]{
\moveto(3.50,5.25)\l\lineto(A_1)}
}
\endpsclip
\uput{6pt}[-105](U'){$x_0-\delta$}
\uput{6pt}[-75](U){$x_0+\delta$}
\uput{6pt}[-90](P'){$x_0$}
\end{pspicture*}\vspace{0.5cm}}
\caption{Hypotrochoid $\mathscr{C}$ obtained for the values $(R_1,R_2)=(5,3)$}
\label{fig limite finito finito}
\vspace{0.5cm}
\end{figure}
%
%
\end{document}`
Inoltre, come si potrebbe rendere il colore di tale area trasparente? Dai manuali non ho capito praticamente nulla.
Grazie a tutti
.
