[Tex/LaTex] Beamer: Vertical shading + plain frame leaves white strip at top of page

beamershading

I've created my own beamer theme which uses a vertical shading for the background, but whenever I'm using a plain frame a thin white strip is left at the top of the page.

I've created a minimum working example that shows the problem even with the default beamer theme:

\documentclass[]{beamer}

\setbeamertemplate{background canvas}[vertical shading][bottom=red,top=red]

\begin{document}
\frame[plain]{\titlepage}
\end{document}

Does anybody know a solution to this?

Btw, I'm using beamer version 3.0.1.

Best Answer

Works fine for me with "Beamer 2010/06/21 development version 3.10". This seems to be an bug which got fixed in the current version. Note that beamer uses PGF which should also be updated.

I used to have the exact same issue until I updated beamer and PGF.

Code

\documentclass{beamer}
\usepackage{tikz}
\usepackage{xifthen}
\usetheme[hideothersubsections]{PaloAlto} 
\usecolortheme{seahorse}
\setbeamercovered{transparent}

\newcommand{\insertpic}[2][scale=1]% [options], picname
{   \begin{tikzpicture}[remember picture,overlay]
        \path (navenddummy);
        \pgfgetlastxy{\xnav}{\ynav}
        \vphantom{\hphantom{
            \node[inner sep=0pt,above right] (pictopdummy) {\includegraphics[#1]{#2}};
        }}
        \path (pictopdummy.north);
        \pgfgetlastxy{\xpic}{\ypic}
        \pgfmathtruncatemacro{\picornot}{\ypic < \ynav ? 1 : 0}
        \ifthenelse{\picornot=1}
            {\node[inner sep=0pt,above right] {\includegraphics[#1]{#2}};}
            {}
        %\node[inner sep=1pt,circle,fill=red] at (navenddummy) {};
        %\node[inner sep=1pt,circle,fill=blue] at (pictopdummy.north) {};
    \end{tikzpicture}
}

\makeatletter
\setbeamertemplate{sidebar \beamer@sidebarside}
{
\beamer@tempdim=\beamer@sidebarwidth%
\advance\beamer@tempdim by -6pt%
{\usebeamerfont{title in sidebar}%
  \vskip1.5em%
  \hskip3pt%
  \usebeamercolor[fg]{title in sidebar}%
  \insertshorttitle[width=\beamer@tempdim,center,respectlinebreaks]\par%
  \vskip1.25em%
}%
{%
  \hskip3pt%
  \usebeamercolor[fg]{author in sidebar}%
  \usebeamerfont{author in sidebar}%
  \insertshortauthor[width=\beamer@tempdim,center,respectlinebreaks]\par%
  \vskip1.25em%
}%
\insertverticalnavigation{\beamer@sidebarwidth}%
%=================
\begin{tikzpicture}[overlay,remember picture]
    \coordinate (navenddummy);
\end{tikzpicture}
%=================
\vfill
\ifx\beamer@sidebarside\beamer@lefttext%
\else%
  \usebeamercolor{normal text}%
  \llap{\usebeamertemplate***{navigation symbols}\hskip0.1cm}%
  \vskip2pt%
\fi%
\hskip8pt
%=================
\insertpic[height=0.7cm,keepaspectratio]{book.png}~
%=================
\vskip2pt
}
\makeatother
\logo{\includegraphics[height=0.7cm,keepaspectratio]{book.png}}

\begin{document} 

\section{Section1}

\frame{Test Frame 1}
\frame{test Frame 2}

\section{Section 2}
\subsection{Subsection1 is a very long-titled subsection}
\subsection{Subsection2 is a very long-titled subsection}
\subsection{Subsection3 is a very long-titled subsection}
\subsection{Subsection4 is a very long-titled subsection}
\subsection{Subsection5 is a very long-titled subsection}
\subsection{Subsection6 is a very long-titled subsection}
\subsection{Subsection7 is a very long-titled subsection}
\subsection{Subsection8 is a very long-titled subsection}
\subsection{Subsection9 is a very long-titled subsection}

\frame{test Frame 3}
\frame{test Frame 4}
\end{document}

Output

enter image description here

[Tex/LaTex] Shading a frame title in PaloAlto beamer

Puh, so many question in a single question!

1) To shade the title I had to redefine the headline and replace the \rule, which normally supplies the background colour by an horizontal shading

2) shading the sidebar was a bit easier, I had just to replace the sidebar canvas left template by a vertical shading

3) Is the frame option plain sufficient for your?

\documentclass{beamer}

\definecolor{msl}{RGB}{27,145,165}
\usetheme{PaloAlto}

\usecolortheme[RGB={27,145,165}]{structure}

\setbeamersize{sidebar width left=2cm}

\setbeamercolor{frametitle}{bg=msl!20!msl}
\setbeamercolor{sidebar}{bg=msl}
\setbeamercolor{title in sidebar}{fg=white}

\makeatletter
\setlength\beamer@sidebarwidth{2cm}
\makeatother

\setbeamertemplate{title page}[default][colsep=-4bp,rounded=true]
\setbeamertemplate{blocks}[rounded][shadow=false]

\title{How to shade in PaloAlto} 
\author{Buzz} 
\institute{TEST}
\date{29 mars 2016} 

\colorlet{titleright}{white}
\colorlet{titlemid}{msl}
\colorlet{titleleft}{msl}

\makeatletter

\pgfdeclarehorizontalshading[titleleft,titleright]{beamer@frametitleshade}{\paperheight}{%
    color(\beamer@sidebarwidth)=(titlemid);%
    color(\paperwidth)=(titleright)%
}

\pgfdeclareverticalshading[titleleft,titleright]{beamer@sidebar}{\beamer@sidebarwidth}{%
    color(0pt)=(titleright);%
    color(\sidebarheight)=(titleleft)%
}

\setbeamertemplate{headline}{%
    \begin{beamercolorbox}[wd=\paperwidth]{frametitle}%
        \ifx\beamer@sidebarside\beamer@lefttext%
        \else%
        \hfill%
        \fi%
        \ifdim\beamer@sidebarwidth>0pt%  
        \usebeamercolor[bg]{logo}%
        \begin{pgfpicture}{0pt}{0pt}{\paperwidth}{\beamer@headheight}%
            \usebeamercolor{frametitle right}%
            \pgfpathrectangle{\pgfpointorigin}{\pgfpoint{\paperwidth}{\beamer@headheight}}%
            \pgfusepath{clip}%
            \pgftext[left,base]{\pgfuseshading{beamer@frametitleshade}}%
        \end{pgfpicture}%
        \vskip-\beamer@headheight%
        \vrule width\beamer@sidebarwidth height \beamer@headheight%
        \hskip-\beamer@sidebarwidth%
        \hbox to \beamer@sidebarwidth{\hss\vbox to
            \beamer@headheight{\vss\hbox{\color{fg}\insertlogo}\vss}\hss}%
        \else%
        \vrule width0pt height \beamer@headheight%  
        \fi%
    \end{beamercolorbox}%
 }

\setbeamertemplate{sidebar canvas left}{%
    \pgfuseshading{beamer@sidebar}%
}

\makeatother

\begin{document}

\hspace*{-1.5cm}
\begin{frame}[plain]
\titlepage % Print the title page as the first slide
\end{frame}

\begin{frame}
\frametitle{TOC} 
test
\end{frame}

\end{document}

Best Answer

Related Solutions

[Tex/LaTex] Beamer: how to show a logo in the vertical bar only if there is enough space left

Code

Output

[Tex/LaTex] Shading a frame title in PaloAlto beamer

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