\begin{texdraw}
\drawdim cm

% abcisas
\move(-0.5 0)
\avec(2 0)
\rmove(0 -0.2)
\textref h:C v:T \htext{$t$}

% ordenadas
\move(0 -0.5)
\avec(0 2)
\rmove(-0.2 0)
\textref h:R v:C \htext{$f(t)$}

%t0
\move(1 -0.1)
\textref h:L v:T \htext{$t_0$}

% rampa
\linewd 0.06

\move(-0.5 0)
\lvec(0 0)
\lvec(1.5 1.5)


\end{texdraw}