[RISOLTO] TIKZ: allineare testo rispetto linee inclinate

Salve a tutti,

premesso che sicuramente il codice è più “programmabile” e qualunque miglioramento è ben accetto, vorrei sapere come poter allineare il testo degli angoli con le relative linee. Per quelli orizzontali e verticali non ho fatto niente di particolare e sembra tutto a posto mentre per quello obliquo non sono riuscito a trovare una soluzione.

[attachment=1315]gonio.jpg[/attachment]

Questo è il codice

`
\documentclass[a4paper,12pt]{article}

\usepackage[latin1]{inputenc} %latin1 o utf8
\usepackage[italian]{babel}
\usepackage[T1]{fontenc}
\usepackage{graphicx}
\usepackage{amsmath,amssymb}
\usepackage{gensymb}
\usepackage{tikz}

\begin{tikzpicture}[scale=0.8]
\coordinate (A) at ({multiply(8.5,{cos(15)})},{multiply(8.5,{sin(15)})});
\coordinate (B) at ({multiply(8.5,{cos(30)})},{multiply(8.5,{sin(30)})});
\coordinate (C) at ({multiply(8.5,{cos(45)})},{multiply(8.5,{sin(45)})});
\coordinate (D) at ({multiply(8.5,{cos(60)})},{multiply(8.5,{sin(60)})});
\coordinate (E) at ({multiply(8.5,{cos(75)})},{multiply(8.5,{sin(75)})});
\coordinate (F) at ({multiply(8.5,{cos(105)})},{multiply(8.5,{sin(105)})});
\coordinate (G) at ({multiply(8.5,{cos(120)})},{multiply(8.5,{sin(120)})});
\coordinate (H) at ({multiply(8.5,{cos(135)})},{multiply(8.5,{sin(135)})});
\coordinate (I) at ({multiply(8.5,{cos(150)})},{multiply(8.5,{sin(150)})});
\coordinate (J) at ({multiply(8.5,{cos(165)})},{multiply(8.5,{sin(165)})});
\coordinate (K) at ({multiply(8.5,{cos(195)})},{multiply(8.5,{sin(195)})});
\coordinate (L) at ({multiply(8.5,{cos(210)})},{multiply(8.5,{sin(210)})});
\coordinate (M) at ({multiply(8.5,{cos(225)})},{multiply(8.5,{sin(225)})});
\coordinate (N) at ({multiply(8.5,{cos(240)})},{multiply(8.5,{sin(240)})});
\coordinate (O) at ({multiply(8.5,{cos(255)})},{multiply(8.5,{sin(255)})});
\coordinate (P) at ({multiply(8.5,{cos(285)})},{multiply(8.5,{sin(285)})});
\coordinate (Q) at ({multiply(8.5,{cos(300)})},{multiply(8.5,{sin(300)})});
\coordinate (R) at ({multiply(8.5,{cos(315)})},{multiply(8.5,{sin(315)})});
\coordinate (S) at ({multiply(8.5,{cos(330)})},{multiply(8.5,{sin(330)})});
\coordinate (T) at ({multiply(8.5,{cos(345)})},{multiply(8.5,{sin(345)})});
\draw (-8.5,0) node [anchor=east] {$180\degree=\pi$} — (8.5,0) node [anchor=west] {$0\degree=2\pi$};
\draw [loosely dashed] (0,0) — (A) node [align=center,anchor=west,rotate=15] {$15\degree=\dfrac{\pi}{12}$};
\draw (0,0) — (B) node [anchor=west,rotate=30] {$30\degree=\dfrac{\pi}{6}$};
\draw [loosely dashed] (0,0) — (C) node [anchor=west,rotate=45] {$45\degree=\dfrac{\pi}{4}$};
\draw (0,0) — (D) node [anchor=west,rotate=60] {$60\degree=\dfrac{\pi}{3}$};
\draw [loosely dashed] (0,0) — (E) node [anchor=west,rotate=75] {$75\degree=\dfrac{5}{12}\,\pi$};
\draw (0,-8.5) node [below] {$270\degree=\dfrac{2}{3}\,\pi$} — (0,8.5) node [above] {$90\degree=\dfrac{\pi}{2}$};
\draw [loosely dashed] (0,0) — (F) node [anchor=east,rotate=285] {$105\degree=\dfrac{7}{12}\,\pi$};
\draw (0,0) — (G) node [anchor=east,rotate=300] {$120\degree=\dfrac{2}{3}\,\pi$};
\draw [loosely dashed] (0,0) — (H) node [anchor=east,rotate=315] {$135\degree=\dfrac{3}{4}\,\pi$};
\draw (0,0) — (I) node [anchor=east,rotate=330] {$150\degree=\dfrac{5}{6}\,\pi$};
\draw [loosely dashed] (0,0) — (J) node [anchor=east,rotate=345] {$165\degree=\dfrac{11}{12}\,\pi$};
\draw [loosely dashed] (0,0) — (K) node [anchor=east,rotate=15] {$195\degree=\dfrac{13}{12}\,\pi$};
\draw (0,0) — (L) node [anchor=east,rotate=30] {$210\degree=\dfrac{7}{6}\,\pi$};
\draw [loosely dashed] (0,0) — (M) node [anchor=east,rotate=45] {$225\degree=\dfrac{5}{4}\,\pi$};
\draw (0,0) — (N) node [anchor=east,rotate=60] {$240\degree=\dfrac{4}{3}\,\pi$};
\draw [loosely dashed] (0,0) — (O) node [anchor=east,rotate=75] {$255\degree=\dfrac{17}{12}\,\pi$};
\draw [loosely dashed] (0,0) — (P) node [anchor=west,rotate=285] {$285\degree=\dfrac{19}{12}\,\pi$};
\draw (0,0) — (Q) node [anchor=west,rotate=300] {$300\degree=\dfrac{5}{3}\,\pi$};
\draw [loosely dashed] (0,0) — (R) node [anchor=west,rotate=315] {$315\degree=\dfrac{7}{4}\,\pi$};
\draw (0,0) — (S) node [anchor=west,rotate=330] {$330\degree=\dfrac{11}{6}\,\pi$};
\draw [loosely dashed] (0,0) — (T) node [anchor=west,rotate=345] {$345\degree=\dfrac{23}{12}\,\pi$};
\draw (0,0) circle [radius=8cm];
\filldraw (4,0) circle [radius=2pt];
\filldraw (0,4) circle [radius=2pt];
\filldraw (-4,0) circle [radius=2pt];
\filldraw (0,-4) circle [radius=2pt];
\coordinate (A1) at ({multiply(8,{cos(15)})},{multiply(8,{sin(15)})});
\coordinate (B1) at ({multiply(8,{cos(30)})},{multiply(8,{sin(30)})});
\coordinate (C1) at ({multiply(8,{cos(45)})},{multiply(8,{sin(45)})});
\coordinate (D1) at ({multiply(8,{cos(60)})},{multiply(8,{sin(60)})});
\coordinate (E1) at ({multiply(8,{cos(75)})},{multiply(8,{sin(75)})});
\coordinate (F1) at ({multiply(8,{cos(105)})},{multiply(8,{sin(105)})});
\coordinate (G1) at ({multiply(8,{cos(120)})},{multiply(8,{sin(120)})});
\coordinate (H1) at ({multiply(8,{cos(135)})},{multiply(8,{sin(135)})});
\coordinate (I1) at ({multiply(8,{cos(150)})},{multiply(8,{sin(150)})});
\coordinate (J1) at ({multiply(8,{cos(165)})},{multiply(8,{sin(165)})});
\coordinate (K1) at ({multiply(8,{cos(195)})},{multiply(8,{sin(195)})});
\coordinate (L1) at ({multiply(8,{cos(210)})},{multiply(8,{sin(210)})});
\coordinate (M1) at ({multiply(8,{cos(225)})},{multiply(8,{sin(225)})});
\coordinate (N1) at ({multiply(8,{cos(240)})},{multiply(8,{sin(240)})});
\coordinate (O1) at ({multiply(8,{cos(255)})},{multiply(8,{sin(255)})});
\coordinate (P1) at ({multiply(8,{cos(285)})},{multiply(8,{sin(285)})});
\coordinate (Q1) at ({multiply(8,{cos(300)})},{multiply(8,{sin(300)})});
\coordinate (R1) at ({multiply(8,{cos(315)})},{multiply(8,{sin(315)})});
\coordinate (S1) at ({multiply(8,{cos(330)})},{multiply(8,{sin(330)})});
\coordinate (T1) at ({multiply(8,{cos(345)})},{multiply(8,{sin(345)})});
\draw [gray] (K1) rectangle (A1);
\draw [gray] (L1) rectangle (B1);
\draw [gray] (M1) rectangle (C1);
\draw [gray] (N1) rectangle (D1);
\draw [gray] (O1) rectangle (E1);
\end{tikzpicture}
`

Saluti

Stefano