documentclass[a4paper,11pt,titlepage,twoside,openright,toc=listof, toc=bibliography]{scrreprt}
usepackage[a4paper, left=4cm, right=2cm, top=2.5cm, bottom=2.5cm]{geometry}
usepackage[english]{babel}

usepackage{graphicx}
usepackage{epstopdf}
usepackage[shell]{gnuplottex}

begin{document}

begin{figure}[hbt]
centering
begin{gnuplot}[terminal=epslatex,terminaloptions=color]
set xrange[0:3.1415]
set yrange[-1:1]
set grid
plot sin(x)

end{gnuplot}
end{figure}

end{document}