Merge branch 'AndreasFMueller:master' into master

4 files changed, 61 insertions, 3 deletions

diff --git a/buch/papers/kreismembran/Makefile b/buch/papers/kreismembran/Makefile
index ce3c89f..a13f2cf 100644
--- a/buch/papers/kreismembran/Makefile
+++ b/buch/papers/kreismembran/Makefile
@@ -4,6 +4,6 @@
 # (c) 2020 Prof Dr Andreas Mueller
 #
 
-images:
-	@echo "no images to be created in kreismembran"
+images/TikzSaite.pdf: images/TikzSaite.tex
+	cd images && pdflatex TikzSaite.tex
 
diff --git a/buch/papers/kreismembran/images/TikzSaite.pdf b/buch/papers/kreismembran/images/TikzSaite.pdf
new file mode 100644
index 0000000..f95ceb9
--- /dev/null
+++ b/buch/papers/kreismembran/images/TikzSaite.pdf
diff --git a/buch/papers/kreismembran/images/TikzSaite.tex b/buch/papers/kreismembran/images/TikzSaite.tex
new file mode 100644
index 0000000..bf3d8f6
--- /dev/null
+++ b/buch/papers/kreismembran/images/TikzSaite.tex
@@ -0,0 +1,57 @@
+% vim: ts=2 sw=2 et :
+\documentclass[tikz, border=2mm]{standalone}
+
+\usepackage{times}
+\usepackage{txfonts}
+
+\begin{document}
+  \begin{tikzpicture}[
+      axis/.style = {very thick, -latex},
+      axis tick/.style = {
+        draw, draw = black, fill = black, rectangle,
+        inner sep = 0pt,
+        minimum height = 2mm,
+        minimum width = 1pt,
+      },
+      string/.style = {
+        ultra thick, draw = black,
+      },
+      string end/.style = {
+        string, circle, fill = gray,
+        inner sep = 0pt, minimum size = 1mm,
+      },
+      force/.style = {
+        very thick, draw = gray, -latex,
+      },
+    ]
+
+    % axes
+    \draw[axis] (0, 0) -- (8cm, 0) node[right] {$x$};
+    \draw[axis] (0, 0) -- (0, 5cm) node[above] {$u(x, t)$};
+
+    % axes ticks
+    \node[axis tick, label = {-90:$x_0$}] at (2cm, 0) {};
+    \node[axis tick, label = {-90:$x_0 + dx$}] at (6cm, 0) {};
+
+    % string
+    \coordinate (A) at (2cm, 2cm);
+    \coordinate (B) at (6cm, 4cm);
+
+    \draw[string] (A) to[out = 40, in = 200] (B);
+
+    \draw[force] (A) -- ++(220:15mm) node[gray, below right] {$T_1$};
+    \draw[force] (B) -- ++(20:15mm) node[gray, above left] {$T_2$};
+
+    \draw[dashed, gray, thick] (A) -- ++(-15mm, 0);
+    \draw[gray, thick] (A) ++ (-7mm,0) arc (180:220:7mm)
+      node[midway, left] {$\alpha$};
+
+    \draw[dashed, gray, thick] (B) -- ++(15mm, 0);
+    \draw[gray, thick] (B) ++ (7mm,0) arc (0:20:7mm)
+      node[pos = 0, below] {$\beta$};
+
+    \node[string end, label={110:$P_1$}] at (A) {};
+    \node[string end, label={110:$P_2$}] at (B) {};
+
+  \end{tikzpicture}
+\end{document}
diff --git a/buch/papers/kreismembran/teil0.tex b/buch/papers/kreismembran/teil0.tex
index 27c6f0f..e962aab 100644
--- a/buch/papers/kreismembran/teil0.tex
+++ b/buch/papers/kreismembran/teil0.tex
@@ -42,7 +42,8 @@ Die Verbindung zwischen Membran und Saite ist intuitiv ersichtlich, stellt man s
 \begin{figure}
 	
 	\begin{center}		
-		\includegraphics[width=5cm,angle=-90]{papers/kreismembran/images/Saite.pdf}
+		% \includegraphics[width=5cm,angle=-90]{papers/kreismembran/images/Saite.pdf}
+		\includegraphics[]{papers/kreismembran/images/TikzSaite.pdf}
 		\caption{Infinitesimales Stück einer Saite}
 		\label{kreismembran:im:Saite}
 	\end{center}