Btukfyl

In the following code, how can nodes (containing triangles, squares and diamonds) be defined once for each, instead of repeating their definitions in every location?

documentclass{beamer}

beamertemplatenavigationsymbolsempty

usepackage{verbatim}

usepackage{tikz}

usepackage{pgfplots}

usepackage{tkz-fct}

usepackage{gensymb}

usetikzlibrary{arrows, arrows.meta, positioning, calc, intersections, decorations.pathreplacing, decorations.pathmorphing, decorations.markings, shapes, shapes.misc, shapes.symbols, shapes.geometric, patterns, backgrounds, trees, shadows}

usetikzlibrary{decorations.shapes}

begin{document}

begin{frame}[fragile,t]

frametitle{}

tikzset{paintt/.style={ draw=#1, fill=#1},decorate with/.style={decorate, decoration={shape backgrounds, shape=#1, shape size=1mm}}}

tikzset{paints/.style={ draw=#1, fill=#1},decorate with/.style={decorate, decoration={shape backgrounds, shape=#1, shape size=1mm}}}

tikzset{paintd/.style={ draw=#1, fill=#1},decorate with/.style={decorate, decoration={shape backgrounds, shape=#1, shape size=1mm}}}

begin{tikzpicture}[scale=.9, transform shape, paint/.style={thin, draw=#1!50!black, fill=#1!50 }]

pgfmathsetmacro{incrmnty}{1.}

pgfmathsetmacro{incrmntx}{.7}

pgfmathsetmacro{xlab}{1997}

pgfmathsetmacro{xn}{14}

pgfmathsetmacro{yn}{6}

begin{scope}[xshift=0cm, yshift=0cm]

foreach x [evaluate=x as aff using int(xlab+(1*x))]in {0,...,xn}{draw [black!20!white] (incrmntx*x,0) node [black, xshift=0cm, yshift=-.68cm, rotate=90] {footnotesize aff} -- +(90:incrmnty*yn);}

end{scope}

begin{scope}[xshift=0cm, yshift=0cm]

foreach y [evaluate=y as aff using int(y*100)]in {0,...,yn}{draw [black!20!white] (10,incrmnty*y) node [black, right] {aff} --+(180:incrmntx*xn+.2);}

end{scope}

begin{scope}[xshift=0cm, yshift=0cm]

draw [thick](0,0) -- (incrmntx*xn,0);

draw [thick](incrmntx*xn,0) -- (incrmntx*xn,incrmnty*yn);

end{scope}

begin{scope}[xshift=0cm, yshift=0cm]

draw [blue!30!white, ultra thick](0,incrmnty*2.6) node [regular polygon,regular polygon sides=3, paintt=blue!30!white, scale=.2]{}% 97

 -- ++(incrmntx*1,.16*incrmnty) node [regular polygon,regular polygon sides=3, paintt=blue!30!white, scale=.2]{}% 98

 -- ++(incrmntx*1,.1*incrmnty) node [regular polygon,regular polygon sides=3, paintt=blue!30!white, scale=.2]{}%99

 -- ++(incrmntx*1,.06*incrmnty) node [regular polygon,regular polygon sides=3, paintt=blue!30!white, scale=.2]{}%0

 -- ++(incrmntx*1,.16*incrmnty) node [regular polygon,regular polygon sides=3, paintt=blue!30!white, scale=.2]{}%1

 -- ++(incrmntx*1,.18*incrmnty) node [regular polygon,regular polygon sides=3, paintt=blue!30!white, scale=.2]{}%2

 -- ++(incrmntx*1,.1*incrmnty) node [regular polygon,regular polygon sides=3, paintt=blue!30!white, scale=.2]{}%3

 -- ++(incrmntx*1,.1*incrmnty) node [regular polygon,regular polygon sides=3, paintt=blue!30!white, scale=.2]{}%4

;

end{scope}

begin{scope}[xshift=0cm, yshift=0cm]

draw [blue!60!black, ultra thick](0,incrmnty*3.2) node [regular polygon,regular polygon sides=4, paints=blue!60!black, scale=.2]{}% 97

 -- ++(incrmntx*1,.2*incrmnty) node [regular polygon,regular polygon sides=4, paints=blue!60!black, scale=.2]{}% 98

 -- ++(incrmntx*1,.1*incrmnty) node [regular polygon,regular polygon sides=4, paints=blue!60!black, scale=.2]{}%99

 -- ++(incrmntx*1,.06*incrmnty) node [regular polygon,regular polygon sides=4, paints=blue!60!black, scale=.2]{}%0

 -- ++(incrmntx*1,.18*incrmnty) node [regular polygon,regular polygon sides=4, paints=blue!60!black, scale=.2]{}%1

 -- ++(incrmntx*1,.18*incrmnty) node [regular polygon,regular polygon sides=4, paints=blue!60!black, scale=.2]{}%2

 -- ++(incrmntx*1,.08*incrmnty) node [regular polygon,regular polygon sides=4, paints=blue!60!black, scale=.2]{}%3

 -- ++(incrmntx*1,.13*incrmnty) node [regular polygon,regular polygon sides=4, paints=blue!60!black, scale=.2]{}%4

;

end{scope}

begin{scope}[xshift=0cm, yshift=0cm]

draw [blue!80!white, ultra thick](0,incrmnty*3.6) node [diamond, paintd=blue!80!white, scale=.2]{}% 97

 -- ++(incrmntx*1,.2*incrmnty) node [diamond, paintd=blue!80!white, scale=.2]{}% 98

 -- ++(incrmntx*1,.1*incrmnty) node [diamond, paintd=blue!80!white, scale=.2]{}%99

 -- ++(incrmntx*1,.06*incrmnty) node [diamond, paintd=blue!80!white, scale=.2]{}%0

 -- ++(incrmntx*1,.18*incrmnty) node [diamond, paintd=blue!80!white, scale=.2]{}%1

 -- ++(incrmntx*1,.18*incrmnty) node [diamond, paintd=blue!80!white, scale=.2]{}%2

 -- ++(incrmntx*1,.08*incrmnty) node [diamond, paintd=blue!80!white, scale=.2]{}%3

 -- ++(incrmntx*1,.13*incrmnty) node [diamond, paintd=blue!80!white, scale=.2]{}%4

;

end{scope}

end{tikzpicture}

end{frame}

end{document}