A planner figure, any visual tools can help?
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5Well, general relativity is even harder for beginners, but this does not mean that others will do your computations for you. Likewise, if you have difficulties with drawing your picture, this does not mean that others take over. For newcomers we sometimes make exceptions, but after the first answer you have already an idea what an MWE is. So please show us what you've tried. – Dec 15 '18 at 02:46
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3@marmot i will try after class, thank you. if anyone have answer, comment after i have tried. – lumw Dec 15 '18 at 03:40
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2Next time please don't upload images that are not upright. Seeing those is much harder than doing others. – Display Name Dec 15 '18 at 06:25
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@ArtificialStupidity i see, it’s not upright, I will correct. thank you! – lumw Dec 15 '18 at 07:40
2 Answers
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considering your answer as starting point (as missing mwe in your question)...
with use of tikz librariesangles (for drawing angles), \arrows.meta (for nice arrows), calc (for drawing orthogonal vectors) and quotes (for angle labels), and use polar coordinates the code for your image can be as follows:
\documentclass[tikz, margin=3mm]{standalone}
\usetikzlibrary{angles, arrows.meta, calc, quotes}
\begin{document}
\begin{tikzpicture}[% styles used in image code
> = Straight Barb, % defined in "arrows.meta
dot/.style = {circle, fill,
minimum size=2mm, inner sep=0pt, outer sep=0pt,
node contents={}},
box/.style = {draw, thin, minimum width=2mm, minimum height=4mm,
inner sep=0pt, outer sep=0pt,
node contents={}, sloped},
my angle/.style args = {#1/#2}{draw,->,
angle radius=#1,
angle eccentricity=#2,
} % angle label position!
]
% coordinate axis
\draw[->] (-3,0) -- (6,0) node[below left] {$x$};
\draw[->] ( 0,0) coordinate[label=below:$O$] (O)
-- (0,6) node[below left] {$y$};
% axis units
\draw[->,thick] (0,0) -- (1,0) node[below] {$i$};
\draw[->,thick] (0,0) -- (0,1) node[right] {$j$};
% dashed line
\draw[dashed] (-2,0) coordinate (s)
-- ++ (32:4.2) node (d1) [dot];
% angle theta, used "angles" and "quotes" library
\pic [draw, my angle=12mm/0.8, "$\Theta$"] {angle = O--s--d1};
% solid line
\draw[thick] (d1) -- node (m) [box] ++ (32:3) node (d2) [dot];
% angle N_z
\pic [draw, my angle=6mm/1.5, "$Nz$"] {angle = d2--m--d1};
% forces in y and x direction
\draw[->] (m.center) -- ++ (1,0) node[below] {$ F_xi $};
\draw[->] (m.center) -- ++ (0,2) node[left] {$ F_xj $};
% vectors v_1, v, v_2, used "calc" library
\draw[->] (d1) -- ($(d1)!12mm! 90:(d2)$);
\draw[->] (d1) -- ($(d1)!12mm!270:(d2)$) coordinate[label=below right:$v_1$] (v1);
\draw[->] (m.center) -- ($(m.center)!12mm!270:(d2)$) coordinate[label=below right:$v$] (v);
\draw[->] (d2) -- ($(d2)!12mm!270:(d1)$);
\draw[->] (d2) -- ($(d2)!12mm! 90:(d1)$) coordinate[label=below right:$v_2$] (v2);
% dashed line between vectors v_1, v_2
\draw [dashed] (v1)--(v2);
\end{tikzpicture}
\end{document}
Zarko
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In the image attached to the question,
v1,vandv2are not of the same length. – AndréC Dec 16 '18 at 04:29
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Yeah, it is not difficult. when you meet problems, do not afraid, just do it step by step.
Although my method based on translation and rotation,\draw everything, not smart, the code is very redundant.
There is the first version. I will keep learning. next, I will use \coordinate to make code simple and efficient.
code as follows:
\documentclass[letter]{article}
\usepackage{tikz}
\begin{document}
\centering
\begin{tikzpicture}
\draw[->] (-2.4,0)--(5,0) node[below] {$ x $}; %coordinate
\draw[->] (0,0)--(0,6) node[left] {$ y $};
\draw[->,thick] (0,0)--(1,0) node[near start,below] {$ O $} node[below] {$ i $}; %unit coordinate
\draw[->,thick] (0,0)--(0,1) node[left] {$ j $};
\draw [dashed,xshift=-2cm,rotate=32] (0,0)--(4.2,0); %line
\draw [xshift=-2cm,rotate=32] (4.2,0)--(7.2,0);
\draw[->] (-0.8cm,0) arc (0:32:1.2cm) node[left=1.2pt,below=2.1pt] {$ \Theta $}; %arc 1
\filldraw[fill=black,xshift=-2cm,rotate=32] (4.2,0) circle (0.1cm); % M1
\draw[->,xshift=-2cm,rotate=32] (4.2,0)--(4.2,1.1);
\draw[->,xshift=-2cm,rotate=32] (4.2,0)--(4.2,-1.45) node[name=v1,right=1pt,below=1pt] {$v_1$};
%rectangle (5.7)
\draw [xshift=-2cm,rotate=32] (5.6,-0.2) rectangle (5.8,0.2);
\draw[->,xshift=-2cm,rotate=32] (6.0cm,0) arc (0:180:0.3cm) node[left=3pt,above=10pt] {$N_z$}; %arc 2
\draw[->,xshift=-2cm,rotate=32] (5.7,0)--(5.7,-1.4) node[right=1pt,below=1pt] {$v$}; %v
\filldraw[fill=black,xshift=-2cm,rotate=32] (7.2,0) circle (0.1cm); % M2
\draw[->,xshift=-2cm,rotate=32] (7.2,0)--(7.2,1);
\draw[->,xshift=-2cm,rotate=32] (7.2,0)--(7.2,-1.3) node[name =v2,right=1pt,below=1pt] {$v_2$};
\draw[->,xshift=-2cm,rotate=32] (5.7,0)--(5.7,0) node[name =c1] {$ $};
\draw[->,xshift=-2cm,rotate=32,rotate around={-32:(c1)}] (5.7,0)--(6.7,0) node[below] {$ F_xi $};
\draw[->,xshift=-2cm,rotate=32,rotate around={-32:(c1)}] (5.7,0)--(5.7,2) node[left] {$ F_xj $};
\draw [dashed,xshift=-2cm,rotate=32] (4.2,-1.45)--(7.2,-1.3);
\end{tikzpicture}
\end{document}
Reference: http://texdoc.net: pgf manual.
lumw
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2Please don't link to that manual, version 3 of TikZ is around five years old already. Link to CTAN (or texdoc.net) instead. – Torbjørn T. Dec 15 '18 at 16:05
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1(i) please, always provide complete small document, not only code fragment (ii) with your code (after adding extend it to mwe) i can't reproduce image showed in your answer. – Zarko Dec 16 '18 at 01:16
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@Zarko already improved, thank you, let me know if you have any questions about it. – lumw Dec 16 '18 at 01:48
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1i saw your corrections :-). now works. well, meantime i write my suggestion how to draw your image. see if it can be helpful :-) – Zarko Dec 16 '18 at 02:19
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@Zarko thank you, it is very helpful :-). I spent much time drawing orthogonal vectors $F_xi$. your answer is simple than me, especially in readability of the code. I have an irrelevant question, how do you think about the
Asymptote, I saw the document in the official site, is it more convenient in drawing 3d graphics? – lumw Dec 16 '18 at 02:33 -
i never not use asymptote, not see its official site. from some questions/answers here i can conclude that it is quite powerful tool. – Zarko Dec 16 '18 at 03:02
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Yes, the great advantage of asymptote 3d is that you can rotate objects with a few pdf readers, for example, here I wrote a die that you can rotate on itself with the mouse: https://tex.stackexchange.com/q/379969/138900 – AndréC Dec 16 '18 at 04:07


