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\documentclass{article}
\thispagestyle{empty}
\usepackage{tikz}
\usetikzlibrary{calc}
\makeatletter
\def\hyper@x#1,#2\relax{#1}
\def\hyper@y#1,#2\relax{#2}
\def\hyper@coords#1{#1}
\newif\ifhyper@vertical
\def\hyper@computer#1#2{%
\edef\hyper@toscan{(#1)}
\tikz@scan@one@point\hyper@coords\hyper@toscan
\edef\hyper@sx{\the\pgf@x}
\edef\hyper@sy{\the\pgf@y}
\edef\hyper@toscan{(#2)}
\tikz@scan@one@point\hyper@coords\hyper@toscan
\edef\hyper@ex{\the\pgf@x}
\edef\hyper@ey{\the\pgf@y}
\pgfmathsetmacro{\hyper@mx}{(\hyper@ex + \hyper@sx)/2}
\pgfmathsetmacro{\hyper@my}{(\hyper@ey + \hyper@sy)/2}
\pgfmathsetmacro{\hyper@dx}{\hyper@ex - \hyper@sx}
\pgfmathparse{\hyper@dx == 0 ? "\noexpand\hyper@verticaltrue" : "\noexpand\hyper@verticalfalse"}
\pgfmathresult
\ifhyper@vertical
\edef\hyper@cmd{-- (\tikztotarget)}
\else
\pgfmathsetmacro{\hyper@dy}{\hyper@ey - \hyper@sy}
\pgfmathsetmacro{\hyper@t}{\hyper@my/\hyper@dx}
\pgfmathsetmacro{\hyper@cx}{\hyper@mx + \hyper@t * \hyper@dy}
\pgfmathsetmacro{\hyper@radius}{veclen(\hyper@cx - \hyper@sx, \hyper@sy)}
\pgfmathsetmacro{\hyper@sangle}{180 - atan2(\hyper@cx-\hyper@sx,\hyper@sy)}
\pgfmathsetmacro{\hyper@eangle}{180 - atan2(\hyper@cx-\hyper@ex,\hyper@ey)}
\edef\hyper@cmd{arc[radius=\hyper@radius pt, start angle=\hyper@sangle, end angle=\hyper@eangle]}
\fi
}
\def\hyper@disc@computer#1#2{%
\edef\hyper@toscan{(#1)}
\tikz@scan@one@point\hyper@coords\hyper@toscan
\edef\hyper@sx{\the\pgf@x}
\edef\hyper@sy{\the\pgf@y}
\edef\hyper@toscan{(#2)}
\tikz@scan@one@point\hyper@coords\hyper@toscan
\edef\hyper@ex{\the\pgf@x}
\edef\hyper@ey{\the\pgf@y}
\pgfmathsetmacro{\hyper@det}{\hyper@sx * \hyper@ey - \hyper@sy * \hyper@ex}
\pgfmathparse{\hyper@det == 0 ? "\noexpand\hyper@verticaltrue" : "\noexpand\hyper@verticalfalse"}
\pgfmathresult
\ifhyper@vertical
\edef\hyper@cmd{-- (\tikztotarget)}
\else
\pgfmathsetmacro{\hyper@mx}{(\hyper@ex + \hyper@sx)/2}
\pgfmathsetmacro{\hyper@my}{(\hyper@ey + \hyper@sy)/2}
\pgfmathsetmacro{\hyper@dx}{\hyper@ex - \hyper@sx}
\pgfmathsetmacro{\hyper@dy}{\hyper@ey - \hyper@sy}
\pgfmathsetmacro{\hyper@dradius}{\pgfkeysvalueof{/tikz/hyperbolic disc radius}}
\pgfmathsetmacro{\hyper@t}{(\hyper@dradius^2 - \hyper@sx * \hyper@ex - \hyper@sy * \hyper@ey)/(2 * (\hyper@sx * \hyper@ey - \hyper@sy * \hyper@ex))}
\pgfmathsetmacro{\hyper@radius}{sqrt(\hyper@t^2 + .25) * veclen(\hyper@dx,\hyper@dy)}
\pgfmathsetmacro{\hyper@cx}{\hyper@mx + \hyper@t * \hyper@dy}
\pgfmathsetmacro{\hyper@cy}{\hyper@my - \hyper@t * \hyper@dx}
\pgfmathsetmacro{\hyper@sangle}{atan2(\hyper@sx-\hyper@cx,\hyper@sy - \hyper@cy)}
\pgfmathsetmacro{\hyper@eangle}{atan2(\hyper@ex-\hyper@cx,\hyper@ey - \hyper@cy)}
\pgfmathsetmacro{\hyper@eangle}{\hyper@eangle > \hyper@sangle + 180 ? \hyper@eangle - 360 : \hyper@eangle}
\edef\hyper@cmd{arc[radius=\hyper@radius pt, start angle=\hyper@sangle, end angle=\hyper@eangle]}
\fi
}
\def\hyper@plane@tangent#1#2{%
\edef\hyper@toscan{(#1)}
\tikz@scan@one@point\hyper@coords\hyper@toscan
\edef\hyper@sx{\the\pgf@x}
\edef\hyper@sy{\the\pgf@y}
\edef\hyper@toscan{(#2)}
\tikz@scan@one@point\hyper@coords\hyper@toscan
\edef\hyper@ex{\the\pgf@x}
\edef\hyper@ey{\the\pgf@y}
% The difference between the end and start defines the tangent
% vector
\pgfmathsetmacro{\hyper@ex}{\hyper@ex - \hyper@sx}
\pgfmathsetmacro{\hyper@ey}{\hyper@ey - \hyper@sy}
% If we're straight up ...
\pgfmathparse{\hyper@ex == 0 ? "\noexpand\hyper@verticaltrue" : "\noexpand\hyper@verticalfalse"}
\pgfmathresult
\ifhyper@vertical
% Need to set length here, rescale to cm first
% User \hyper@ey here as that remembers the sign
\pgfmathsetmacro{\hyper@d}{\hyper@ey/1cm}
\pgfmathsetmacro{\hyper@radius}{\hyper@sy * exp(\hyper@d) - \hyper@sy}
\edef\hyper@cmd{-- ++(0,\hyper@radius pt)}
\else
% Set length
\pgfmathsetmacro{\hyper@d}{\hyper@ex > 0 ? veclen(\hyper@ex,\hyper@ey) : -veclen(\hyper@ex,\hyper@ey)}
% Radius of arc
\pgfmathsetmacro{\hyper@radius}{abs(\hyper@sy * \hyper@d / \hyper@ex)}
% Starting angle
\pgfmathsetmacro{\hyper@sangle}{90 + atan(\hyper@ey/\hyper@ex)}
% Ending angle, check if given
\pgfkeysgetvalue{/tikz/hyperbolic plane target angle}{\hyper@eangle}
\ifx\hyper@eangle\pgfutil@empty
% rescale into cm to avoid Big Numbers
\pgfmathsetmacro{\hyper@d}{\hyper@d/1cm}
\pgfmathsetmacro{\hyper@ey}{\hyper@ey/1cm}
\pgfmathsetmacro{\hyper@tanhd}{tanh(\hyper@d)}
\pgfmathsetmacro{\hyper@eangle}{acos((\hyper@d * \hyper@tanhd - \hyper@ey)/(\hyper@d - \hyper@ey * \hyper@tanhd))}
%
\fi
\edef\hyper@cmd{arc[radius=\hyper@radius pt, start angle=\hyper@sangle, end angle=\hyper@eangle]}
\fi
}
\tikzset{%
hyperbolic disc radius/.initial={1cm},
hyperbolic plane/.style={
to path={
\pgfextra{\hyper@computer\tikztostart\tikztotarget}
\hyper@cmd
}
},
hyperbolic plane tangent/.style={
to path={
\pgfextra{\hyper@plane@tangent\tikztostart\tikztotarget}
\hyper@cmd
}
},
hyperbolic disc/.style={
to path={
\pgfextra{\hyper@disc@computer\tikztostart\tikztotarget}
\hyper@cmd
}
},
hyperbolic plane target angle/.initial={},
}
\makeatother
\begin{document}
\begin{tikzpicture}[every to/.style={hyperbolic plane}]
\fill[blue] (0,1) \foreach \k in {0,...,7} { to ++(\k * 45:2)};
\coordinate (b) at (1,2);
\coordinate (a) at (3,4);
\fill (a) circle[radius=2pt];
\fill (b) circle[radius=2pt];
\draw (-2,0) -- (6,0);
\draw (a) to (b);
\end{tikzpicture}
\begin{tikzpicture}[hyperbolic disc radius=2cm,
every to/.style={hyperbolic disc}]
\draw (0,0) circle[radius=\pgfkeysvalueof{/tikz/hyperbolic disc radius}];
\pgfmathsetmacro{\hyperrad}{1/(2*sin(22.5))}
\fill[blue] (-112.5:\hyperrad) \foreach \k in {0,...,7} { to ++(\k * 45:1)};
\coordinate (b) at (1.2,.3);
\coordinate (a) at (.8,-.4);
\fill (a) circle[radius=2pt];
\fill (b) circle[radius=2pt];
\draw (a) to (b);
\end{tikzpicture}
\begin{tikzpicture}[every to/.style={hyperbolic plane tangent}]
\draw (1,2) circle[radius=2pt] to ++(1,1) circle[radius=4pt];
\draw[red] (-1,2) circle[radius=2pt] to[hyperbolic plane target angle=0] ++(-60:2) circle[radius=4pt];
\draw (0,1) circle[radius=2pt] \foreach \k in {0,...,7} { to ++(\k * 45:1)};
\draw[thick,gray,<->] let \p{east}=(current bounding box.east), \p{west}=(current bounding box.west) in (\x{east},0) -- (\x{west},0);
\end{tikzpicture}
\end{document}
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