I am working with beamer templates. I have set a template for usual slides with a purple line in its background, using this code:
%set purple line
\usepackage{tikz}
\usetikzlibrary{patterns}
\usetikzlibrary{decorations}
\addtobeamertemplate{frametitle}{}{ %purple line
\begin{textblock*}{15mm}(-45,155)
\begin{tikzpicture}
\draw (-8.5,1.5) .. controls (-3,0) and (3, 0) .. (8.5,1.5);
\end{tikzpicture}
\end{textblock*}
}
Some standard colors in my presentation are purple, so it indeed appears purple.
Now, I am trying to make some template for a different type of slide in the same beamer presentation, using this code:
\defbeamertemplate{background canvas}{picture background}
{
\begin{textblock*}{15mm}(0,0)
\begin{tikzpicture}
\draw[TIGblauw,fill=TIGblauw] (-8.5,1.5) .. controls (-3,0) and (3, 0) .. (8.5,1.5);
\end{tikzpicture}
\end{textblock*}
}
As you can see, I am using the same rounding. However, I want it to be blue (which does not work) and I want it to fill to the top. It should look like this:
However, it should only apply to slides that I use this background template with.
Currently, the line is still purple and nothing changes.
I feel like multiple things are problematic here, but my main question is about filling the background with blue color starting from a non-linear line. The other info is to exclude some solutions which would interfere with the rest of my presentation.
Here a minimal reproducable example, although I feel it might not be minimal. Not sure what interferes
\documentclass[aspectratio=169]{beamer} %Most screens have 16:9 display
%-------------------------- PACKAGES --------------------------
\usepackage{textpos} %absolute text positioning on slide
\usepackage{caption, subcaption} %Captions for figures and tables
\usepackage{graphicx} %Figures
\usepackage[export]{adjustbox} %Great if graphicx is not enough
\usepackage[dutch]{babel} %To make some things Dutch, such as month in date
\usepackage{datetime} %To be able to work with dates
%-------------------------- OVERALL THEME --------------------------
\useoutertheme[subsection=false]{miniframes} %great for navigation <3
\AtBeginSection{} % hides section page
%-------------------------- COLORS --------------------------
\definecolor{TIGpaars}{RGB}{117,21,88}
\definecolor{TIGgroen}{RGB}{180,220,0}
\definecolor{TIGblauw}{RGB}{81,199,253}
\setbeamercolor{frametitle}{fg=TIGpaars}
\setbeamercolor{framesubtitle}{fg=TIGblauw}
\setbeamercolor{palette primary}{fg=TIGpaars, bg=white}
\setbeamercolor{normal text}{fg=black, bg=white}
\setbeamercolor{section in head/foot}{fg=white, bg=TIGpaars}
\setbeamercolor{alerted text}{fg=TIGblauw}
\setbeamercolor{item}{fg=TIGpaars}
%-------------------------- TITLE PAGE --------------------------
\newcommand{\titlem}{Default title}
\newcommand{\subtitlem}{} %default is no subtitle
\newdateformat{dutchformat}{\twodigit{\THEDAY}{\THEMONTH}{\THEYEAR}}
\newcommand{\datem}{\today} %default date is today
\setbeamertemplate{title page}{
\begin{picture}(0pt,0pt)
%\centering
\put(-35pt,-147pt){ %background picture
\includegraphics[width=1.01\paperwidth]{Include/Overige afbeeldingen/Front page.png}
}
\put(0pt,-78pt){ %titles
\begin{minipage}[b][45mm][t]{226mm}
\usebeamerfont{title}{\textcolor{white}{\titlem} \par}
\usebeamerfont{subtitle}{\textcolor{TIGgroen}{\subtitlem}}
\end{minipage}
}
\put(330pt,-243pt){ %text right bottom
\begin{minipage}[b][45mm][t]{226mm}
{\tiny \textcolor{TIGpaars}{Deventer, \datem}}
\end{minipage}
}
\end{picture}
}
%----------------------- ALL SLIDES DEFAULT -----------------------
\setbeamertemplate{frame numbering}[none]{} %no page numbering
%set purple line
\usepackage{tikz}
\usetikzlibrary{patterns}
\usetikzlibrary{decorations}
\addtobeamertemplate{frametitle}{}{ %purple line
\begin{textblock}{15mm}(-45pt,155pt)
\begin{tikzpicture}
\draw (-8.5,1.5) .. controls (-3,0) and (3, 0) .. (8.5,1.5);
\end{tikzpicture}
\end{textblock}
}
%set TIG text: www.tignl.eu
\addtobeamertemplate{frametitle}{}{
\begin{textblock}{110mm}(0.83\textwidth,67mm) % absolute positioning right lower corner
{example}
\end{textblock}
}
\addtobeamertemplate{frametitle}{}{
\begin{textblock}{115mm}(0mm,67mm)
{\tiny \textcolor{TIGpaars}{\titlem | © 2023 Ex}}
\end{textblock}
}
\defbeamertemplate{background canvas}{picture background}
{
\begin{textblock}{15mm}(0,0)
\begin{tikzpicture}
\draw[TIGblauw,fill=TIGblauw] (-8.5,1.5) .. controls (-3,0) and (3, 0) .. (8.5,1.5);
\end{tikzpicture}
\end{textblock}
}
\begin{document}
\begin{frame}
\titlepage %title page is defined above
\end{frame}
\section{example slides - More nice stuff}
\begin{frame}{Example slide \hyperlink{Appendix}{\beamerbutton{Appendix}}}{lorem}
Mus mauris vitae ultricies leo integer malesuada nunc vel. Maecenas volutpat blandit aliquam etiam erat.
\begin{itemize}
\item Pretium nibh ipsum consequat nisl. \alert{hello} Pretium nibh ipsum consequat nisl.
\item Etiam erat velit scelerisque in dictum non.
\end{itemize}
\end{frame}
\section{example slides - final stuff}
\begin{frame}{Appendix}{lorem}\label{Appendix}
Odio tempor orci dapibus ultrices in iaculis. Lorem sed risus ultricies tristique nulla aliquet enim. Arcu vitae elementum curabitur vitae nunc sed velit dignissim. Nunc vel risus commodo viverra maecenas accumsan. Sit amet tellus cras adipiscing enim.
\end{frame}
\setbeamertemplate{background canvas}[vertical color]{
\begin{frame}{test}
\end{frame}
}
\end{document}
