Graphics, Figures & Tables ⇒ tikZ | Intersection Points

[ghostanime2001]

How do you create an arc from two points of intersections between a straight line and the x axis (see example below the circles are the points of intersection between the straight line and the arc.

Code: Select all

\documentclass[fleqn]{article} 
\usepackage{amsfonts}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amstext}
\usepackage{amsthm}
\usepackage{array}
\usepackage{auto-pst-pdf}
\usepackage{bigstrut}
\usepackage{booktabs}
\usepackage{bpchem}
\usepackage{calc}
\usepackage{cancel}
\usepackage{chemfig}
\usepackage{chemmacros}
\usepackage[shortlabels,inline]{enumitem}
\usepackage{fix-cm}
\usepackage[T1]{fontenc}
\usepackage{fouridx}
\usepackage{fourier}
\usepackage{fullpage} 
\usepackage[margin=1in]{geometry} 
\usepackage{graphics}
\usepackage{graphicx}
\usepackage[utf8]{inputenc}
\usepackage{lewis}
\usepackage{lmodern}
\usepackage{microtype}
\usepackage{makebox}
\usepackage[version=3]{mhchem}
\usepackage{multienum}
\usepackage{multirow}
\usepackage{nccboxes}
\usepackage{pbox}
\usepackage{pgfkeys}
\usepackage{pifont}
\usepackage{pst-math}
\usepackage{pst-node}
\usepackage{pst-plot}
\usepackage{pstricks}
\usepackage{tensor}
\usepackage{tikz}
\usetikzlibrary{matrix,calc,intersections,through,backgrounds,arrows,decorations.pathmorphing}
\usepackage{textcomp}
\usepackage{type1cm}
\usepackage{ulem}
\usepackage{wasysym}
\usepackage{xcolor}
\setlength{\parindent}{0pt}
\setlength{\parskip}{0pt}
\setlength{\mathindent}{0pt}
\allowdisplaybreaks
\pagestyle{empty}
\begin{document}
\begin{tikzpicture}
\draw [name path=xaxis] (-0.5,0) -- (2,0);
\draw [name path=yaxis] (0,-0.5) -- (0,1);
\path [name path=force,draw] (0:0) -- (30.9:2cm);
\path [name path=arc,draw] (0.4,0) arc (0:40:0.4cm);
\draw [name intersections={of=arc and xaxis, by=x}] (x) circle (1pt);
\draw [name intersections={of=arc and force, by=y}] (y) circle (1pt);
\end{tikzpicture}
\end{document}

[ghostanime2001]

bump

[Stefan Kottwitz]

It's good that you post an example. However, it's much larger than needed. I may require that the reader installs some packages to compile it. Or to clean the preamble himself - there's a lot of packages which are not related to the question.

I mean it just constructive. Otherwise we might commonly get huge documents for small problems. Of course I tried your code to help, but I got an error when I compiled:

Code: Select all

! No room for a new \dimen .
\ch@ck ...\else \errmessage {No room for a new #3}
                                                  \fi 
l.148 \newdimen\UL@pixel
                         \UL@pixel=1in \divide\UL@pixel 300

It's caused by the ulem package and can be fixed by omitting it (here it's not required) or by loading the etex package.

However, I don't like it much to fix other not asked unnecessary problems before coming to the real question, so perhaps shorten your code and try posting complete examples which are as short as possible in the future, that would be great. And improving a question or adding information is a better way to bump than to just bump without.

Stefan

[ghostanime2001]

What I meant to say is how do you join points of intersection between
1. the diagonal line and circle
2. the horizontal line and circle
with an arc in between these two intersections ?

cleaned up code :

Code: Select all

    
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{intersections}
\begin{document}
\begin{tikzpicture}
\draw [name path=axis] (-1,0) -- (1,0);
\draw [name path=line] (-0.2,-0.2) -- (0.5,0.5);
\path [name path=circle,draw] (0,0) circle (0.4cm);
\draw [name intersections={of=circle and axis, by=x}] (x) circle (1pt);
\draw [name intersections={of=circle and line, by=y}] (y) circle (1pt);
\end{tikzpicture}
\end{document}

note: my code is compiled with xelatex