Starting from Claudio Fiandrino's answer (Design a custom Beamer theme from scratch), I'm trying to create my own beamer theme for my thesis' presentation. I'm quite satisfied with it, but I would like to solve some issues:
- On the title page, I set the distance between the top margin and the title using
\vskip<..>cm, but I have to change it everytime I modify the title (e.g. if the title spans two lines, I'll have to decrease it) in order to have the baseline of the title aligned with the end of the "vertical blue line" that you can see in the code. Is there a way to have this automatically set? - If the frame title (and subtitle) spans over two lines, the new line won't be indented as the first one (whose indent is
\SideMargin); I tried with\parbox, but I could not make it work properly.
I tried to clean the code as much as possible to show only the part that is causing these problems. The title page background is an image:
TitlePage.png
All the files which defines the theme are:
beamercolorthemePOLIMI.sty
\mode<presentation>
% Colors
% Footer
\definecolor{POLIblue}{RGB}{0,51,102}
\definecolor{POLIblue1}{RGB}{26,72,118}
\definecolor{POLIblue2}{RGB}{49,91,132}
\definecolor{POLIblue3}{RGB}{111,140,169}
\definecolor{POLIblue4}{RGB}{154,175,195}
\definecolor{POLIblue5}{RGB}{168,187,203}
\definecolor{POLIblue6}{RGB}{159,178,198}
\definecolor{POLIblue7}{RGB}{148,170,191}
\definecolor{POLIblue8}{RGB}{102,133,163}
% Header
\definecolor{POLIblue9}{RGB}{177,202,226}
\definecolor{POLIblue10}{RGB}{103,154,204}
\definecolor{POLIblue11}{RGB}{2,53,102}
\definecolor{POLIblue12}{RGB}{181,186,194}
% Page number
\definecolor{POLIpage}{RGB}{2,62,109}
% Settings
\setbeamercolor*{title page header}{fg=POLIblue}
\setbeamercolor*{author}{fg=black}
\setbeamercolor*{date}{fg=POLIblue}
\setbeamercolor*{item}{fg=POLIblue}
\setbeamercolor*{frametitle}{fg=POLIblue}
\setbeamercolor*{framesubtitle}{fg=POLIblue1}
\setbeamercolor*{page number in head/foot}{fg=POLIpage}
\setbeamercolor*{author in head/foot}{fg=POLIblue}
\mode<all>
beamerinnerthemePOLIMI.sty
\mode<presentation>
\usetikzlibrary{positioning}
\newlength\SideMargin
\setlength\SideMargin{1cm}
\newlength\TopMargin
\setlength\TopMargin{1cm}
\newlength\ImageWidth
\setlength\ImageWidth{\dimexpr\the\paperwidth-2\SideMargin\relax}
\setbeamertemplate{background}{
\begin{tikzpicture}
\useasboundingbox (0,0) rectangle(\the\paperwidth,\the\paperheight);
\ifnum\thepage=1\relax{%
% Title page background
\node[anchor=north west,inner sep=0pt,minimum size=0pt] at(\SideMargin,{\the\paperheight-\TopMargin}){\includegraphics[width=\ImageWidth]{TitlePage.png}};
%%%% VERTICAL BLU LINE - I would like to have the bottom of the title aligned with the end of this line
\draw[color=POLIblue,line width=0.5pt] (8.186,10)--node[pos=1,inner sep=0pt,minimum size=0pt](b){}(8.186,6);
}
\else{%
\fill[white,opacity=1] (0,0) rectangle(\the\paperwidth,\the\paperheight);
}
\fi
\end{tikzpicture}
}
\setbeamerfont{title}{size=\normalfont\Large,family={\fontfamily{phv}},series=\bfseries}
\setbeamerfont{author}{size=\normalfont\normalsize,family={\fontfamily{phv}}}
\setbeamerfont{date}{size=\normalfont\small,family={\fontfamily{phv}}}
% Title page
\defbeamertemplate*{title page}{POLIMI}[1][]
{
\vskip10.4cm% TITLE POSITIONING
\begin{beamercolorbox}[wd=25cm,leftskip=7.85cm,sep=8pt,#1]{title page header}
\usebeamerfont{title}\inserttitle\par%
\end{beamercolorbox}%
\vskip0.75cm%
\begin{beamercolorbox}[wd=25cm,leftskip=8.5cm,#1]{author}
\usebeamerfont{author}\insertauthor%
\end{beamercolorbox}
\vskip1cm%
\begin{beamercolorbox}[wd=25cm,leftskip=8.5cm,#1]{date}
\ifx\insertdate\@empty%
\else
\usebeamerfont{date}\insertdate%
\fi
\end{beamercolorbox}
\vfill
}
\mode<all>
beamerouterthemePOLIMI.sty
\mode<presentation>
\setbeamerfont{frametitle}{size=\normalfont\Large,family={\fontfamily{phv}},series=\bfseries}
\setbeamerfont{framesubtitle}{size=\normalfont\large,family={\fontfamily{phv}}}
\setbeamerfont{page number in head/foot}{size=\normalfont\normalsize,family={\fontfamily{phv}},series=\bfseries}
% Frame title
\defbeamertemplate*{frametitle}{POLIMI}[1][]
{
\vskip\TopMargin%
\begin{beamercolorbox}[wd=\paperwidth,ht=1cm]{frametitle}
\begin{tikzpicture}
\useasboundingbox[fill=white](0,0) rectangle(\the\paperwidth,1.2);
% Rectangles, line and frame number
\fill[POLIblue9] (19.2,0.75) rectangle (20.2,1);
\fill[POLIblue10] (20.4,0.75) rectangle (21.4,1);
\fill[POLIblue11] (21.6,0.75) rectangle (\the\paperwidth-\SideMargin,1);
\draw[POLIblue12] (19.2,-0.45) -- node[pos=0.1,above=0.2cm](PageN){%
\begin{beamercolorbox}[wd=1cm,ht=1ex,dp=0ex,left]{page number in head/foot}%
\usebeamerfont{page number in head/foot}\insertframenumber{}%
\end{beamercolorbox}} (\the\paperwidth-\SideMargin,-0.45);
% FRAME TITLE AND SUBTITLE
\ifx\insertframesubtitle\@empty%
{\node[anchor=west] at (\SideMargin-1.25cm,0.25){%
\begin{beamercolorbox}[wd=0.7\paperwidth,ht=5ex,dp=1ex,left]{frametitle}%
\usebeamerfont{frametitle}\hskip\SideMargin\insertframetitle%
%\parbox[t]{\dimexpr0.9\paperwidth-1em\relax}{\insertsection}%
\end{beamercolorbox}};
}%
\else%
{\node[anchor=west] at (\SideMargin-1.25cm,0.6){%
\begin{beamercolorbox}[wd=0.7\paperwidth,ht=5ex,dp=1ex,left]{frametitle}%
\usebeamerfont{frametitle}\hskip\SideMargin\insertframetitle%
\end{beamercolorbox}};
\node[anchor=west] at (\SideMargin-1.25cm,-0.4){%
\begin{beamercolorbox}[wd=0.7\paperwidth,ht=5ex,dp=1ex,left]{framesubtitle}%
\usebeamerfont{framesubtitle}\hskip\SideMargin\insertframesubtitle%
\end{beamercolorbox}};%
}%
\fi
\end{tikzpicture}
\end{beamercolorbox}
\vskip10mm%
}
\mode<all>
beamerthemePOLIMI.sty
\mode<presentation>
%%%% Requirements
% Page layout
\RequirePackage{geometry}
% Tikz pictures
\RequirePackage{tikz}
% Font type
\usepackage[T1]{fontenc}
\RequirePackage{helvet}
% Justified text
\RequirePackage{ragged2e}
\justifying
% Settings
\geometry{paperwidth=254.0mm,
paperheight=190.5mm,
left=0mm,
right=0mm,
top=0mm,
bottom=0mm}
\setbeamersize{text margin left=15mm,text margin right=15mm}
% Themes
\useinnertheme{POLIMI}
\useoutertheme{POLIMI}
\usecolortheme{POLIMI}
\setbeamertemplate{navigation symbols}{}
\mode<all>
Finally, the presentation file that shows these problems:
\documentclass[17pt]{beamer}
\let\Tiny=\tiny
\usepackage{lipsum}
\title{Title, that might span one or two lines (or even more)}
\date{Now}
\author[Me]{Me}
\usetheme{POLIMI}
\begin{document}
\begin{frame}
\titlepage
\end{frame}
\begin{frame}{A quite long frame title that cannot be shortened}
\lipsum[1]
\end{frame}
\begin{frame}{Another quite long frame title that cannot be shortened}
\framesubtitle{The same might happen for the frame subtitle, if it's too long}
\lipsum[1]
\end{frame}
\end{document}
