Work path integrals

Edit and compile if you like:

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% Author: Izaak Neutelings (September 2020)
% Inspiration: https://tex.stackexchange.com/questions/25531/adding-underbrace-in-tikz
\documentclass[border=3pt,tikz]{standalone}
\usepackage{physics}
\usepackage{tikz}
\usetikzlibrary{arrows.meta}
\usetikzlibrary{angles,quotes} % for pic
\usetikzlibrary{decorations.markings,arrows.meta}
\tikzset{>=latex} % for LaTeX arrow head
\colorlet{myred}{red!65!black}
\colorlet{mydarkblue}{blue!30!black}
\colorlet{xcol}{blue!70!black}
\colorlet{vcol}{green!70!black}
\colorlet{acol}{red!50!blue!80!black!80}
\tikzstyle{vector}=[->,very thick,xcol,line cap=round]
\tikzstyle{force}=[->,myred,thick,line cap=round]
\tikzstyle{Fproj}=[force,myred!40]
\tikzstyle{mydashed}=[dash pattern=on 2pt off 2pt]
\newcommand{\vbF}{\vb{F}}
\def\tick#1#2{\draw[thick] (#1) ++ (#2:0.1) --++ (#2-180:0.2)} %0.03*\xmax
\tikzset{
  midarr/.style={decoration={markings,mark=at position #1 with {\arrow{stealth}}},postaction={decorate}},
  midarr/.default=0.5
}
\begin{document}
% CURVED PATH
\begin{tikzpicture}
  \def\ul{0.6}
  \def\Ra{1.4}
  \def\Rb{0.8}
  \def\anga{0}
  \def\angb{25}
  \coordinate (A) at (0,0);
  \coordinate (B) at (1.1,1.9);
  \coordinate (C) at (2.1,1.0);
  \coordinate (D) at (3.7,0.4);
 
 
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