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Code improvement on a title page design

TeX - LaTeX Asked on May 22, 2021

I am designing a new title page to post in the topic Showcase of beautiful title page done in TeX but am having some issues with the code I wrote. I don’t like and I know it can be improved. In addition I would like to add a small little feature to it. I would like to add a horizontal line (essentially a mini version of the same shape, trapezoid, I have designed) right below the epigraph statement with a different opacity say, opacity=0.5. Here is the MWE:

enter image description here

documentclass[letterpaper]{article}
usepackage{amsmath}
usepackage{tikz}
usepackage{epigraph}
usepackage{lipsum}

renewcommandepigraphflush{flushleft}
renewcommandepigraphsize{normalsize}
setlengthepigraphwidth{0.7textwidth}

definecolor{titlepagecolor}{cmyk}{0.436,.865,0,.478}

DeclareFixedFont{titlefont}{T1}{ppl}{b}{it}{0.5in}

makeatletter                       
defprintauthor{%                  
    {large @author}}              
makeatother
author{%
    Author 1 name 
    Department name 
    texttt{[email protected]}vspace{20pt} 
    Author 2 name 
    Department name 
    texttt{[email protected]}
    }
% This is the command I wish to optimize
newcommandtitlepagedecoration[1]{%
begin{tikzpicture}[remember picture,overlay,shorten >= -10pt]
coordinate (tp1) at ([yshift=2cm]current page.west);
coordinate (tp2) at ([yshift=2cm,xshift=9cm]current page.west);
coordinate (tp3) at ([yshift=-15pt,xshift=7cm]current page.north);
coordinate (tp4) at ([yshift=-15pt]current page.north west);

filldraw[draw=titlepagecolor,fill=titlepagecolor] (tp1)--(tp2)--(tp3)--(tp4)--cycle;
filldraw[draw=titlepagecolor!30!white,fill=titlepagecolor!30!white,opacity=0.2] ([xshift=-5cm]tp1)--([xshift=-5cm]tp2)--([xshift=-5cm]tp3)--([xshift=-5cm]tp4)--cycle;
node[right] at ([xshift=1cm,yshift=-5cm]current page.north west) {parbox{textwidth}{color{white}#1}};
end{tikzpicture}%
}

begin{document}
begin{titlepage}
titlepagedecoration{%
titlefont Hardy's Theorempar
epigraph{Pure mathematics is on the whole distinctly more useful than applied. For what is useful above all is technique, and mathematical technique is taught mainly through pure mathematics.}%
{textit{London 1941} textsc{G. H. Hardy}}
}
nullvfill
vspace*{1cm}
noindent
begin{minipage}{0.35linewidth}
    begin{flushleft}
        printauthor
    end{flushleft}
end{minipage}
end{titlepage}
lipsum[1-2]
end{document}

Note that the part I wish to optimize is the background code.

EDIT

Here is a quick mockup of what am after which is almost achieved by Henri Menke below:

enter image description here

best practicescode reviewtikz pgf

One Answer

I hope, I got you right.

documentclass[letterpaper]{article}
usepackage{amsmath}
usepackage{tikz}
usepackage{epigraph}
usepackage{lipsum}

renewcommandepigraphflush{flushleft}
renewcommandepigraphsize{normalsize}
setlengthepigraphwidth{0.7textwidth}

definecolor{titlepagecolor}{cmyk}{0.436,.865,0,.478}

DeclareFixedFont{titlefont}{T1}{ppl}{b}{it}{0.5in}

makeatletter                       
defprintauthor{%                  
    {large @author}}              
makeatother
author{%
    Author 1 name 
    Department name 
    texttt{[email protected]}vspace{20pt} 
    Author 2 name 
    Department name 
    texttt{[email protected]}
    }
% This is the command I wish to optimize
newcommandtitlepagedecoration[1]{%
begin{tikzpicture}[remember picture,overlay,shorten >= -10pt]
coordinate (tp1) at ([yshift=2cm]current page.west);
coordinate (tp2) at ([yshift=2cm,xshift=9cm]current page.west);
coordinate (tp3) at ([yshift=-15pt,xshift=7cm]current page.north);
coordinate (tp4) at ([yshift=-15pt]current page.north west);

filldraw[draw=titlepagecolor,fill=titlepagecolor] (tp1)--(tp2)--(tp3)--(tp4)--cycle;
filldraw[draw=titlepagecolor!30!white,fill=titlepagecolor!30!white,opacity=0.2] ([xshift=-5cm]tp1)--([xshift=-5cm]tp2)--([xshift=-5cm]tp3)--([xshift=-5cm]tp4)--cycle;
node[right] at ([xshift=1cm,yshift=-5cm]current page.north west) {parbox{textwidth}{color{white}#1}};
end{tikzpicture}%
}

begin{document}
begin{titlepage}
    titlepagedecoration{%
        titlefont Hardy's Theorempar
        epigraph{Pure mathematics is on the whole distinctly more useful than applied. For what is useful above all is technique, and mathematical technique is taught mainly through pure mathematics.}%
        {textit{London 1941} textsc{G. H. Hardy}}
        %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        %%%%%% CHANGES HERE %%%%%%%%%%%%%%%%
        tikz[remember picture,overlay]{%
            node (X) {};
            filldraw[opacity=0.5,draw=titlepagecolor,fill=titlepagecolor] (tp1 |- X) -- (X -| tp2) -- (tp2) -- (tp1) -- cycle;
        }
        %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    }
    nullvfill
    vspace*{1cm}
    noindent
    begin{minipage}{0.35linewidth}
        begin{flushleft}
            printauthor
        end{flushleft}
    end{minipage}
end{titlepage}
lipsum[1-2]
end{document}

enter image description here

Another possibility is

documentclass[letterpaper]{article}
usepackage{amsmath}
usepackage{tikz}
usepackage{epigraph}
usepackage{lipsum}

renewcommandepigraphflush{flushleft}
renewcommandepigraphsize{normalsize}
setlengthepigraphwidth{0.7textwidth}

definecolor{titlepagecolor}{cmyk}{0.436,.865,0,.478}

DeclareFixedFont{titlefont}{T1}{ppl}{b}{it}{0.5in}

makeatletter                       
defprintauthor{%                  
    {large @author}}              
makeatother
author{%
    Author 1 name 
    Department name 
    texttt{[email protected]}vspace{20pt} 
    Author 2 name 
    Department name 
    texttt{[email protected]}
    }
% This is the command I wish to optimize
newcommandtitlepagedecoration[1]{%
begin{tikzpicture}[remember picture,overlay,shorten >= -10pt]
coordinate (tp1) at ([yshift=2cm]current page.west);
coordinate (tp2) at ([yshift=2cm,xshift=9cm]current page.west);
coordinate (tp3) at ([yshift=-15pt,xshift=7cm]current page.north);
coordinate (tp4) at ([yshift=-15pt]current page.north west);

filldraw[draw=titlepagecolor,fill=titlepagecolor] (tp1)--(tp2)--(tp3)--(tp4)--cycle;
filldraw[draw=titlepagecolor!30!white,fill=titlepagecolor!30!white,opacity=0.2] ([xshift=-5cm]tp1)--([xshift=-5cm]tp2)--([xshift=-5cm]tp3)--([xshift=-5cm]tp4)--cycle;
node[right] at ([xshift=1cm,yshift=-5cm]current page.north west) {parbox{textwidth}{color{white}#1}};
end{tikzpicture}%
}

begin{document}
begin{titlepage}
    titlepagedecoration{%
        titlefont Hardy's Theorempar
        epigraph{Pure mathematics is on the whole distinctly more useful than applied. For what is useful above all is technique, and mathematical technique is taught mainly through pure mathematics.
        %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        %%%%%% CHANGES HERE %%%%%%%%%%%%%%%%
        tikz[remember picture,overlay]{%
            node (X) at (0,-1ex) {};
            filldraw[opacity=0.5,draw=titlepagecolor,fill=titlepagecolor] (tp1 |- X) -- (X -| tp2) -- (tp2) -- (tp1) -- cycle;
        }
        %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        }%
        {textit{London 1941} textsc{G. H. Hardy}}

    }
    nullvfill
    vspace*{1cm}
    noindent
    begin{minipage}{0.35linewidth}
        begin{flushleft}
            printauthor
        end{flushleft}
    end{minipage}
end{titlepage}
lipsum[1-2]
end{document}

enter image description here

I updated my answer according to your edit:

documentclass[letterpaper]{article}
usepackage{tikz}
usetikzlibrary{intersections}
usepackage{epigraph}
usepackage{lipsum}
renewcommandepigraphflush{flushleft}
renewcommandepigraphsize{normalsize}
setlengthepigraphwidth{0.7textwidth}
definecolor{titlepagecolor}{cmyk}{0.436,.865,0,.478}
DeclareFixedFont{titlefont}{T1}{ppl}{b}{it}{0.5in}
makeatletter                       
defprintauthor{%                  
    {large @author}}              
makeatother
author{%
    Author 1 name 
    Department name 
    texttt{[email protected]}vspace{20pt} 
    Author 2 name 
    Department name 
    texttt{[email protected]}
    }
% This is the command I wish to optimize
newcommandtitlepagedecoration[1]{%
begin{tikzpicture}[remember picture,overlay,shorten >= -10pt]
coordinate (tp1) at ([yshift=2cm]current page.west);
coordinate (tp2) at ([yshift=2cm,xshift=9cm]current page.west);
coordinate (tp3) at ([yshift=-15pt,xshift=7cm]current page.north);
coordinate (tp4) at ([yshift=-15pt]current page.north west);
% Place text to het its coordinates
node[right] (titletext) at ([xshift=1cm,yshift=-5cm]current page.north west) {parbox{textwidth}{color{white}#1}};

path[name path=p1] ([xshift=-5cm]tp2) -- ([xshift=-5cm]tp3);
path[name path=p2] (tp2) -- (tp3);
path[name path=p3] (tp1 |- titletext.south) -- (titletext.south -| tp3);

path[name intersections={of=p1 and p3,name=first}];
path[name intersections={of=p2 and p3,name=second}];

filldraw[titlepagecolor!100!white] (first-1) -- (second-1) -- (tp3) -- ([xshift=-5cm]tp3) -- cycle;
filldraw[titlepagecolor!80!white] (tp4) -- ([xshift=-5cm]tp3) -- (first-1) -- (tp1 |- titletext.south) -- cycle;
filldraw[titlepagecolor!100!white] (tp1 |- titletext.south) -- (first-1) -- ([xshift=-5cm]tp2) -- (tp1) -- cycle;
filldraw[titlepagecolor!80!white] (first-1) -- (second-1) -- (tp2) -- ([xshift=-5cm]tp2) -- cycle;
% Place text again, to have it on top
node[right] (titletext) at ([xshift=1cm,yshift=-5cm]current page.north west) {parbox{textwidth}{color{white}#1}};
end{tikzpicture}%
}

begin{document}
begin{titlepage}
    titlepagedecoration{%
        titlefont Hardy's Theorempar
        epigraph{Pure mathematics is on the whole distinctly more useful than applied. For what is useful above all is technique, and mathematical technique is taught mainly through pure mathematics.}%
        {textit{London 1941} textsc{G. H. Hardy}}
    }
    nullvfill
    vspace*{1cm}
    noindent
    begin{minipage}{0.35linewidth}
        begin{flushleft}
            printauthor
        end{flushleft}
    end{minipage}
end{titlepage}
lipsum[1-2]
end{document}

enter image description here

Correct answer by Henri Menke on May 22, 2021

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