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Correct copyright statement

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hmenke committed Mar 10, 2019
1 parent de70419 commit cc51495175dfc41c907ee810953c2b7c1b67673f
@@ -1,5 +1,7 @@
\section{Three Point Perspective Drawing Library}

\noindent\emph{by Max Snippe}

\begin{tikzlibrary}{perspective}
This library provides tools for perspective drawing with one, two, or three
vanishing points.
@@ -59,10 +61,10 @@ \subsection{Setting the view}
\begin{scope}[rotate around z=\az]
\pgfmathsetmacro\el{50}
\begin{scope}[canvas is yz plane at x=0]
\draw[->] (0,0) ++(-2.5,0) arc (180:180-\el:2.5)
\draw[->] (0,0) ++(-2.5,0) arc (180:180-\el:2.5)
coordinate[pos=0.5](el);
\draw (el) -- ++(180-\el/2:1) node[above]{\meta{elevation}};
\draw[dashed] (0,0) --
\draw[dashed] (0,0) --
pic[solid,sloped,transform shape,pos=1.2]{viewpoint} ++(180-\el:3);
\end{scope}
\end{scope}
@@ -163,7 +165,7 @@ \subsection{Defining the perspective}
%
\begin{key}{/tikz/perspective/p=\marg{x,y,z} (initially (0,0,0))}
The location of the vanishing point that determines the `strength' of the
perspective in $x$-direction can be set with the |p| key.
perspective in $x$-direction can be set with the |p| key.
\begin{codeexample}[]
\begin{tikzpicture}[
3d view,
@@ -180,7 +182,7 @@ \subsection{Defining the perspective}
of |p| to \texttt{0} (e.g. |p={(0,a,b)}|, where \texttt{a} and \texttt{b}
can be any number and will be ignored). Or one can provide |q| and |r| and
omit |p|.

By changing the $y$ and $z$ components of |p|, one can achieve various
effects.
\begin{codeexample}[]
@@ -213,7 +215,7 @@ \subsection{Defining the perspective}
\end{key}
%
\begin{key}{/tikz/perspective/q=\marg{x,y,z} (initially (0,0,0))}
Similar to |p|, but can be turned off by setting its $y$ component to
Similar to |p|, but can be turned off by setting its $y$ component to
\texttt{0}.
\begin{codeexample}[]
\begin{tikzpicture}[
@@ -227,7 +229,7 @@ \subsection{Defining the perspective}
\end{key}
%
\begin{key}{/tikz/perspective/r=\marg{x,y,z} (initially (0,0,0))}
Similar to |p|, but can be turned off by setting its $z$ component to
Similar to |p|, but can be turned off by setting its $z$ component to
\texttt{0}.
\begin{codeexample}[]
\begin{tikzpicture}[
@@ -253,7 +255,7 @@ \subsection{Shortcomings}
\item Keys like |rotate around x|, |rotate around y|, and |rotate around z|
are not working
\item Units are not working
\item Most keys from the |3d| library are unsupported, e.g. all the
\item Most keys from the |3d| library are unsupported, e.g. all the
|canvas is .. plane| keys.
\end{itemize}

@@ -267,7 +269,7 @@ \subsection{Examples}
p = {(8,0,0)},
q = {(0,8,0)},
r = {(0,0,-8)}}]

\simplecuboid{2}{2}{2}]

\end{tikzpicture}
@@ -285,9 +287,9 @@ \subsection{Examples}
q = {(0,4,0)}}]

\node[fill=red,circle,inner sep=1.5pt,label=above:p] at (4,0,0){};

\foreach \i in {0,...,100}{
\filldraw[fill = gray] (tpp cs:x=\i,y=0,z=0)
\filldraw[fill = gray] (tpp cs:x=\i,y=0,z=0)
-- (tpp cs:x=\i+0.5,y=0,z=0)
-- (tpp cs:x=\i+0.5,y=2,z=0)
-- (tpp cs:x=\i,y=2,z=0)
@@ -306,7 +308,7 @@ \subsection{Examples}
perspective={
p = {(20,0,0)},
q = {(0,20,0)}}]

\filldraw[fill=brown] (tpp cs:x=0,y=0,z=0)
-- (tpp cs:x=0,y=4,z=0)
-- (tpp cs:x=0,y=4,z=2)
@@ -358,15 +360,15 @@ \subsection{Examples}

% A more complex example.
\iffalse
Of course these examples can become as complex as desired, but as with any 3D
drawing using Ti\textit{k}z, the order of drawing commands is important and can
Of course these examples can become as complex as desired, but as with any 3D
drawing using \tikzname, the order of drawing commands is important and can
become increasingly more complex.
\nopagebreak
\begin{codeexample}[]
\begin{tikzpicture}[
cycle of vertices/.style 2 args={
insert path={
foreach \i [count=\j,evaluate=\j as \k using
foreach \i [count=\j,evaluate=\j as \k using
{ifthenelse(\j==1,"","-- "}] in {#2}{\k (vert-#1-\i)} -- cycle}},
scale=0.7,
line join=round,
@@ -1,4 +1,4 @@
% Copyright 2006 by Till Tantau
% Copyright 2019 by Max Snippe
%
% This file may be distributed and/or modified
%

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