/
fig026_seg.pgf
60 lines (47 loc) · 1.48 KB
/
fig026_seg.pgf
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% (c) 2012 Dimitrios Vrettos - d.vrettos@gmail.com
\begin{tikzpicture}[font=\small,x=10mm, y=10mm]
\draw[->] (0,0) -- (8,0) node [below right] () {$r$};
\foreach \x in {.8,3,4.5}{
\draw(\x,3pt)--(\x,-3pt);
\begin{scope}[dotted]
\draw (\x,0) -- (\x,-2);
\draw (0,-.5) -- (3,-.5);
\draw (0,-1) -- (4.5,-1);
\draw (.8,-1.5) -- (8,-1.5);
\end{scope}}
\node[above] at (.8,0) {$\frac{4}{5}$};
\node[above] at (3,0) {$3$};
\node[above] at (4.5,0) {$\frac{9}{2}$};
\begin{scope}[blue,thick]
\draw (3,-.5) -- (8,-.5);
\draw (4.5,-1) -- (8,-1);
\draw (0,-1.5) -- (.8,-1.5);
\draw[fill=white] (3,-.5)circle (1.5pt);
\draw[fill=white] (4.5,-1)circle (1.5pt);
\draw[fill=white] (.8,-1.5)circle (1.5pt);
\end{scope}
\foreach \x in {-1.5}{
\node at (\x,-.25) {segno di $F_1$:};
\node at (\x,-.75) {segno di $F_2$:};
\node at (\x,-1.25) {segno di $F_3$:};
\node at (\x,-1.75) {segno di $P$:};
}
\foreach \z in {.4,1.9}
\node at (\z,-.25) {$-$};
\foreach \zi in {.4,1.9, 3.75}
\node at (\zi,-.75) {$-$};
\foreach \zii in {1.9, 3.75,6.25}
\node at (\zii,-1.25) {$-$};
\foreach \ziii in {3.75,6.25}
\node at (\ziii,-.25) {$+$};
\node at (6.25,-.75) {$+$};
\node at (.4,-1.25) {$+$};
\begin{scope}[red]
\foreach \y in {-1.75}{
\foreach \ziv in {.4,3.75}
\node at (\ziv,\y) {$+$};
\foreach \zv in {1.9,6.25}
\node at (\zv,\y) {$-$};
}
\end{scope}
\end{tikzpicture}