[Tex/LaTex] Draw an arc over 360 degrees

arctikz-pgf

I have the following problem with tikz: I want to draw some circular arcs, but unfortunately these arcs have degrees which pass the 360° line. I would like to be able to draw these arcs with one single command, but I can't figure out how to do it. If I give the arc commands two angles where the first is larger than the second, tikz will simply interchange the angles before drawing them.

% radius, two angles, node attribute/name
\newcommand{\drawarc}[5]
{
\draw[gray, very thin] (0,0) --  (#2:#1);
\draw (#2:#1) arc(#2:#3:#1);
\draw[gray, very thin] (0,0) --  (#3:#1);
\draw({(#2+#3)/2}:#1) node[#4] {#5};
}

\begin{tikzpicture}[scale=4]

\drawarc{1cm}{80}{100}{above}{1};

\drawarc{0.9cm}{60}{110}{below}{2};

\drawarc{0.75cm}{20}{85}{below left}{4};

\drawarc{0.8cm}{95}{150}{below right}{3};

\drawarc{1cm}{105}{200}{above}{5};

% I would like to replace these 2 commands
% by one, drawing an arc from 195 to 75 degrees
\drawarc{1.2cm}{195}{360}{above}{6};
\drawarc{1.2cm}{0}{75}{}{};

\drawarc{1.3cm}{160}{280}{left}{8};

\drawarc{0.9cm}{140}{190}{right}{7};

% and the same here
\drawarc{1cm}{260}{360}{above left}{9};
\drawarc{1cm}{0}{40}{}{};
\end{tikzpicture}

I am bounding every arc by lines from/to (0,0), so if I draw multiple arcs where I only need one, the additional lines look somewhat crappy.

Best Answer

You can use angles greater than 360!

Replace your 4 lines with the following two:

 \drawarc{1.2cm}{195}{435}{above}{6}; 
%\drawarc{1.2cm}{0}{75}{}{}; 360+75=435

and

  \drawarc{1cm}{260}{400}{above left}{9}; 
%\drawarc{1cm}{0}{40}{}{}; 360+40=400

to get the desired result:

enter image description here

Related Solutions

[Tex/LaTex] Draw the proper angle arc

First, you don't have to load color as tikz already loads xcolor. You have to put the things in this order though:

\usepackage{tikz}
\definecolor{Darkgreen}{rgb}{0,0.4,0}
\definecolor{Darkblue}{rgb}{0,0,0.4}

Having said that, why to manually calculate the angles? Use clip. First draw a triangle (well almost a triangle)

\path[clip] (0,2) -- (0,0) -- (-3,4);

and then a circle:

\node[circle,draw=Darkgreen,minimum size=40pt] at (0,0) (circ) {};

Code:

\documentclass[11pt,a4paper]{book}
\usepackage{kerkis}
%\usepackage{kmath}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsfonts}
\usepackage{amsthm}
%\usepackage{color}
%\usepackage[usenames,dvipsnames]{color}
\usepackage{tikz}
\definecolor{Darkgreen}{rgb}{0,0.4,0}
\definecolor{Darkblue}{rgb}{0,0,0.4}

\begin{document}
\begin{tikzpicture}
\draw[gray,->] (-5,0) -- (5,0);
\draw[gray,->] (0,-5) -- (0,5);
\draw[gray,dashed] (-5,4) -- (5,4);
\node at (5,0.2) {$x$};
\node at (-0.2,5) {$y$};

\fill (0,0) circle (2pt) node[below] (e) {$m,e$};
\fill (-3,4) circle (2pt) node[above] (ion) {$ze$};

\draw[red] (0,0) -- (-3,4);
\draw[gray,->] (4,1.75) -- (4,0);
\draw[gray,->] (4,2.25) -- (4,4);
\node at (4,2) {$b$};
\draw[blue,->] (-3,4) -- (-1.5,4);
\node[blue] at (-1.8,4.2) {$V$};
\node[red] at (-2.7,3) {$r$};

\draw[Darkgreen,->] (0,0) -- (-1.5,2);
\draw[Darkgreen,->] (0,0) -- (0,2);
\draw[Darkgreen,->] (0,0) -- (-1.5,0);
\draw[Darkgreen,very thin,dashed] (0,2) -- (-1.5,2);
\draw[Darkgreen,very thin,dashed] (-1.5,0) -- (-1.5,2);

\node[color=Darkgreen] at (0.3,2) {$F_y$};
\node[Darkgreen] at (-1.5,-0.3) {$F_x$};
\node[Darkgreen,left] at (-1.7,2) {$F=\dfrac{kze^2}{r^2}$};
%% First clip 
\path[clip] (0,2) -- (0,0) -- (-3,4) -- cycle;
%%The circle 
\node[circle,draw=Darkgreen,minimum size=40pt] at (0,0) (circ) {};
%
%\draw[Darkgreen] (0.5,0.5) arc (80:123:0.8cm);
\draw[Darkgreen] (1cm,0cm) arc (90:125:1cm);

\end{tikzpicture}
\end{document}

enter image description here

[Tex/LaTex] Draw edge on arc

you say:

drawing an arc alone does not draw arrows and does not end at the "borders" of the nodes, but at there center

(*their center, b.t.w.)

but it is not completely true; you can try with a workaround with arc. For example:

\draw [right, ->] (0.3,8) arc [radius=4, start angle=90, end angle= 0];

will draw an arrow from V1 to almost V2.

Playing around with the radius and the location of the nodes you can draw your circle (with arrows, see the -> above)

EDIT:

to avoid playing around with the starting location you can use node anchors:

\draw [->] (V1.east) arc [radius=4, start angle=90, end angle= 0];

Best Answer

Related Solutions

[Tex/LaTex] Draw the proper angle arc

[Tex/LaTex] Draw edge on arc

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