From 32f1a1d818f0fe28b2ae97071e31a773ee2d028a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andreas=20M=C3=BCller?= <andreas.mueller@ost.ch>
Date: Thu, 19 May 2022 17:28:33 +0200
Subject: some local changes

---
 buch/papers/fresnel/images/schale.tex | 77 +++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 buch/papers/fresnel/images/schale.tex

(limited to 'buch/papers/fresnel/images/schale.tex')

diff --git a/buch/papers/fresnel/images/schale.tex b/buch/papers/fresnel/images/schale.tex
new file mode 100644
index 0000000..577ede4
--- /dev/null
+++ b/buch/papers/fresnel/images/schale.tex
@@ -0,0 +1,77 @@
+%
+% schlange.tex
+%
+% (c) 2021 Prof Dr Andreas Müller, OST Ostschweizer Fachhochschule
+%
+\documentclass[tikz]{standalone}
+\usepackage{times}
+\usepackage{amsmath}
+\usepackage{txfonts}
+\usepackage[utf8]{inputenc}
+\usepackage{graphics}
+\usetikzlibrary{arrows,intersections,math,calc}
+\usepackage{ifthen}
+\begin{document}
+
+\newboolean{showgrid}
+\setboolean{showgrid}{false}
+\def\breite{4}
+\def\hoehe{4}
+\def\a{47}
+\def\r{3.3}
+\def\skala{0.95}
+
+\begin{tikzpicture}[>=latex,thick,scale=\skala]
+
+\begin{scope}[xshift=-7.4cm,yshift=-1.2cm]
+	\clip (-3.6,-2.2) rectangle (3.6,5.1);
+
+	\fill[color=blue!20] (0,0)
+		-- ({180-\a}:{0.4*\r}) arc ({180-\a}:180:{0.4*\r})
+		-- cycle;
+	\node[color=blue] at ({180-\a/2}:{0.3*\r}) {$\vartheta$};
+
+	\fill[color=blue!20] (0,{\r/sin(\a)})
+		-- ($(0,{\r/sin(\a)})+({270-\a}:{0.3*\r})$)
+			arc ({270-\a}:270:{0.3*\r})
+		-- cycle;
+	\node[color=blue] at ($(0,{\r/sin(\a)})+({270-\a/2}:{0.2*\r})$)
+		{$\vartheta$};
+
+
+	\draw (0,0) circle[radius=\r];
+	\draw[->] (0,-3.0) -- (0,5);
+	\draw ({-\r-0.2},0) -- ({\r+0.2},0);
+	\fill (0,0) circle[radius=0.06];
+
+	\draw (0,0) -- ({180-\a}:\r);
+	\node at ({180-\a+3}:{0.65*\r}) [above right] {$1$};
+
+	\draw[color=red,line width=1.4pt]
+		({180-\a}:\r) -- (0,{\r/cos(90-\a)});
+	\fill[color=red] ({180-\a}:\r) circle[radius=0.08];
+	\fill[color=red] (0,{\r/cos(90-\a)}) circle[radius=0.08];
+	\node[color=red] at (-1.0,3.7) [left] {$r=\cot\vartheta$};
+	\node[color=red] at ({180-\a}:\r) [above left] {$P$};
+	\node[color=red] at (0,{\r/sin(\a)}) [right] {$Q$};
+\end{scope}
+
+% Povray Bild
+\node at (0,0) {\includegraphics[width=7.6cm]{schale.jpg}};
+
+% Gitter
+\ifthenelse{\boolean{showgrid}}{
+\draw[step=0.1,line width=0.1pt] (-\breite,-\hoehe) grid (\breite, \hoehe);
+\draw[step=0.5,line width=0.4pt] (-\breite,-\hoehe) grid (\breite, \hoehe);
+\draw                            (-\breite,-\hoehe) grid (\breite, \hoehe);
+\fill (0,0) circle[radius=0.05];
+}{}
+
+\node[color=red] at (-1.4,1.4) {$r$};
+\node[color=red] at (-2.2,-0.2) {$P$};
+\node[color=red] at (0,3.3) [right] {$Q$};
+
+\end{tikzpicture}
+
+\end{document}
+
-- 
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