Inserting a .tex image into my LaTeX document

Question

I'm using a program that exports images in a .tex format and I was wondering if anyone know how I should include this in my main TeX file?

\fcolorbox{white}{white}{%
\begin{picture}(162,306)(271,-175) 
\SetWidth{1.0} 
\SetColor{Black}
\Line[arrow,arrowpos=0.5,arrowlength=5,arrowwidth=2,arrowinset=0.2](272,-174)(35‌2,-94)
\Line[arrow,arrowpos=0.5,arrowlength=5,arrowwidth=2,arrowinset=0.2](352,-94)(432,-174) 
\Photon(352,-94)(352,50){7.5}{7} \Line[arrow,arrowpos=0.5,arrowlength=5,arrowwidth=2,arrowinset=0.2](352,50)(432,‌130)
\Line[arrow,arrowpos=0.5,arrowlength=5,arrowwidth=2,arrowinset=0.2](272,130)(352‌,50) 
\Text(368,-14)[lb]{\Large{\Black{$\gamma$}}} 
\end{picture}}

Answer 1

here is a complete example of your code:

\documentclass[a4paper,11pt]{article}
\usepackage{axodraw4j}
\usepackage{color}
\setlength\unitlength{1pt}
\begin{document}

\framebox{\fcolorbox{white}{white}{%
\begin{picture}(162,306) (271,-175) 
\SetWidth{1.0} 
\SetColor{Black} 
\Line[arrow,arrowpos=0.5,arrowlength=5,arrowwidth=2,arrowinset=0.2](272,-174)(352,-94) 
\Line[arrow,arrowpos=0.5,arrowlength=5,arrowwidth=2,arrowinset=0.2](352,-94)(432,-174) 
\Photon(352,-94)(352,50){7.5}{7} 
\Line[arrow,arrowpos=0.5,arrowlength=5,arrowwidth=2,arrowinset=0.2](352,50)(432,130) 
\Line[arrow,arrowpos=0.5,arrowlength=5,arrowwidth=2,arrowinset=0.2](272,130)(352,50) 
\Text(368,-14)[lb]{\Large{\Black{$\gamma$}}} 
\end{picture}}}

%\input{<file>.tex}  % instead of the above code

\end{document}

If the package axodraw4j is not already on your system then you have to install it manually. It is not on CTAN!

Answer 2

The code that you show in a comment looks on the surface like LaTeX syntax, but it is definitely not LaTeX out of the box, as commands like \Line, \Photon, \Text, etc. aren't defined by LaTeX. Thus as part of the program that you used to produce this code, there has to be some "package" (a file with the extension .sty, or perhaps .dtx if it isn't unpacked) that defines those commands.

Search for that file and then load it in the preamble of your document as

\usepackage{<name-of-package>}

and at the point you want your graphic appear

\input{<mygraphic>.tex}

Without a clue what the program is that you used, this is all guesswork of course.