fix progress bar computation

beamerouterthemeJuelich.sty

@@ -213,7 +213,7 @@
 %------------------------------------------------
 \defbeamertemplate{progressbar}{visible}
 {%
-\tlap{\progressbar@progressbar}
+\usebeamertemplate*{progress bar footer}
 }
 
 \defbeamertemplate*{progressbar}{invisible}{}

beamerthemeJuelich.sty

@@ -10,6 +10,7 @@
 \RequirePackage{calc}
 \RequirePackage{textcase}
 \usetikzlibrary{calc}
+\usetikzlibrary{external}
 
 \ifluatex
   \RequirePackage{microtype}
@@ -91,27 +92,26 @@
 
 % define progressbar
 \makeatletter
-\def\progressbar@progressbar{} % the progress bar
-\newcount\progressbar@tmpcounta% auxiliary counter
-\newcount\progressbar@tmpcountb% auxiliary counter
-\newdimen\progressbar@pbht %progressbar height
-\newdimen\progressbar@pbwd %progressbar width
-\newdimen\progressbar@tmpdim % auxiliary dimension
-
-\progressbar@pbwd=\paperwidth
-\progressbar@pbht=0.2ex
-
-\def\progressbar@progressbar{%
-  \progressbar@tmpcounta=\insertframenumber
-  \progressbar@tmpcountb=\inserttotalframenumber
-  \progressbar@tmpdim=\progressbar@pbwd
-  \divide\progressbar@tmpdim  by 128
-  \multiply\progressbar@tmpdim by \progressbar@tmpcounta
-  \divide\progressbar@tmpdim by \progressbar@tmpcountb
-  \multiply\progressbar@tmpdim  by 128
-  \begin{tikzpicture}
-  \draw[draw=none,fill=fzjblue] %
-    (0pt, 0pt) rectangle ++ (\progressbar@tmpdim, \progressbar@pbht);
-  \end{tikzpicture}%
+
+\newlength{\fzj@progressinheadfoot}
+\newlength{\fzj@progressinheadfoot@linewidth}
+\setlength{\fzj@progressinheadfoot@linewidth}{0.4pt}
+\setbeamertemplate{progress bar footer}{
+  \nointerlineskip
+  \setlength{\fzj@progressinheadfoot}{%
+    \paperwidth * \ratio{\insertframenumber pt}{\inserttotalframenumber pt}%
+  }%
+  \begin{beamercolorbox}[wd=\paperwidth]{progress bar footer}
+    \tikzset{external/export next=false}%
+    \begin{tikzpicture}
+      \fill[fg] (0,0) rectangle (\fzj@progressinheadfoot, \fzj@progressinheadfoot@linewidth);
+    \end{tikzpicture}%
+  \end{beamercolorbox}
 }
+
+% make sure we have a large number of total slided before the first run to keep the frame/total frame ratio below 1
+% if your slide deck has more than 300 slides, you might increase the number below
+% after the second latex run the totalframenumber will be read correctly from the .aux file
+\def\inserttotalframenumber{300}
+
 \makeatother

tests/many-pages.tex

 \documentclass[t]{beamer}
 \usetheme{Juelich}
+\usepackage{calc}
 
 \title{Test for Very Long Documents}
 \subtitle{Large numbers might break computation}