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% Copyright 2019 by Till Tantau
%
% This file may be distributed and/or modified
%
% 1. under the LaTeX Project Public License and/or
% 2. under the GNU Public License.
%
% See the file doc/generic/pgf/licenses/LICENSE for more details.
\ProvidesFileRCS{pgfcorepoints.code.tex}
\newdimen\pgf@picminx
\newdimen\pgf@picmaxx
\newdimen\pgf@picminy
\newdimen\pgf@picmaxy
\newdimen\pgf@pathminx
\newdimen\pgf@pathmaxx
\newdimen\pgf@pathminy
\newdimen\pgf@pathmaxy
\newif\ifpgf@relevantforpicturesize
\def\pgf@process#1{{#1\global\pgf@x=\pgf@x\global\pgf@y=\pgf@y}}
% Save a point.
%
% #1 = macro for storing point.
% #2 = code for point (should define x and y)
%
% Example:
%
% \pgfextract@process\mypoint{\pgf@x=10pt \pgf@y10pt}
% \pgfextract@process\myarcpoint{\pgfpointpolar{30}{5cm and 2cm}}
\def\pgfextract@process#1#2{%
\pgf@process{#2}%
\edef#1{\noexpand\global\pgf@x=\the\pgf@x\noexpand\relax\noexpand\global\pgf@y=\the\pgf@y\noexpand\relax}%
}
% This needed until old shapes code changed.
\let\pgfsavepgf@process\pgfextract@process%
% Return a point
%
% #1 = x-coordinate of the point
% #2 = y-coordinate of the point
%
% x = #1
% y = #2
%
% Example:
%
% \pgfpathmoveto{\pgfpoint{2pt+3cm}{3cm}}
\def\pgfpoint#1#2{%
\pgfmathsetlength\pgf@x{#1}%
\pgfmathsetlength\pgf@y{#2}\ignorespaces}
% Quickly a point
%
% #1 = x-coordinate of the point (no calculations done)
% #2 = y-coordinate of the point (no calculations done)
%
% x = #1
% y = #2
%
% Example:
%
% \pgfpathmoveto{\pgfqpoint{2pt}{3cm}}
\def\pgfqpoint#1#2{\global\pgf@x=#1\relax\global\pgf@y=#2\relax}
% Return the origin.
%
% x = 0
% y = 0
%
% Example:
%
% \pgfpathmoveto{\pgfpointorigin}
\def\pgfpointorigin{\global\pgf@x=0pt \global\pgf@y=\pgf@x\ignorespaces}
% Return a transformed point
%
% #1 = a point
%
% Description:
%
% This command applies pgf's current transformation matrix to the
% given point. Normally, this is done automatically by commands like
% lineto or moveto, but sometimes you may wish to access a transformed
% point yourself. In the below example, this command is used for a low level
% coordinate system shift.
%
% Example:
%
% \begin{pgflowleveltransformshiftscope}{\pgfpointtransformed{\pgfpointorigin}}
% \pgfbox[center,center]{Hi!}
% \end{pgflowleveltransformshiftscope}
\def\pgfpointtransformed#1{%
\pgf@process{%
#1%
\pgf@pos@transform@glob%
}%
}
% Return the difference vector of two points.
%
% #1 = start of vector
% #2 = end of vector
%
% x = x-component of difference
% y = y-component of difference
%
% Example:
%
% \pgfpathmoveto{\pgfpointdiff{\pgfpointxy{1}{1}}{\pgfpointxy{2}{3}}}
\def\pgfpointdiff#1#2{%
\pgf@process{#1}%
\pgf@xa=\pgf@x%
\pgf@ya=\pgf@y%
\pgf@process{#2}%
\global\advance\pgf@x by-\pgf@xa\relax%
\global\advance\pgf@y by-\pgf@ya\relax\ignorespaces}
% Add two vectors.
%
% #1 = first vector
% #2 = second vector
%
% x = x-component of addition
% y = y-component of addition
%
% Example:
%
% \pgfpathmoveto{\pgfpointadd{\pgfpointxy{0}{1}}{\pgfpointxy{2}{3}}}
\def\pgfpointadd#1#2{%
\pgf@process{#1}%
\pgf@xa=\pgf@x%
\pgf@ya=\pgf@y%
\pgf@process{#2}%
\global\advance\pgf@x by\pgf@xa%
\global\advance\pgf@y by\pgf@ya}
% Multiply a vector by a factor.
%
% #1 = factor
% #2 = vector
%
% Example:
%
% \pgfpointscale{2}{\pgfpointxy{0}{1}}
\def\pgfpointscale#1#2{%
\pgf@process{#2}%
\pgfmathparse{#1}%
\global\pgf@x=\pgfmathresult\pgf@x%
\global\pgf@y=\pgfmathresult\pgf@y%
}
% A "quick" variant of \pgfpointscale which doesn't invoke the math parser for '#1'.
% #1 must be a number without units, no registers are accepted.
\def\pgfqpointscale#1#2{%
\pgf@process{#2}%
\global\pgf@x=#1\pgf@x%
\global\pgf@y=#1\pgf@y%
}
% The intersection of two lines
%
% #1 = point on first line
% #2 = another point on first line
% #3 = point on second line
% #4 = another point on second line
%
% Returns the intersection of the two lines. If there is no
% intersection or if the points #1 and #2 or the points #3 and #4 are
% identical, the behaviour is not specified.
%
% Example:
%
% \pgfpointintersectionoflines{\pgfpointxy{0}{1}}{\pgfpointxy{1}{0}}{\pgfpointxy{2}{2}}{\pgfpointxy{3}{4}}
\def\pgfpointintersectionoflines#1#2#3#4{%
{%
%
% Compute orthogonal vector to #1--#2
%
\pgf@process{#2}%
\pgf@xa=\pgf@x%
\pgf@ya=\pgf@y%
\pgf@process{#1}%
\advance\pgf@xa by-\pgf@x%
\advance\pgf@ya by-\pgf@y%
\pgf@ya=-\pgf@ya%
% Normalise a bit
\c@pgf@counta=\pgf@xa%
\ifnum\c@pgf@counta<0\relax%
\c@pgf@counta=-\c@pgf@counta\relax%
\fi%
\c@pgf@countb=\pgf@ya%
\ifnum\c@pgf@countb<0\relax%
\c@pgf@countb=-\c@pgf@countb\relax%
\fi%
\advance\c@pgf@counta by\c@pgf@countb\relax%
\divide\c@pgf@counta by 65536\relax%
\ifnum\c@pgf@counta>0\relax%
\divide\pgf@xa by\c@pgf@counta\relax%
\divide\pgf@ya by\c@pgf@counta\relax%
\fi%
%
% Compute projection
%
\pgf@xc=\pgf@sys@tonumber{\pgf@ya}\pgf@x%
\advance\pgf@xc by\pgf@sys@tonumber{\pgf@xa}\pgf@y%
%
% The orthogonal vector is (\pgf@ya,\pgf@xa)
%
%
% Compute orthogonal vector to #3--#4
%
\pgf@process{#4}%
\pgf@xb=\pgf@x%
\pgf@yb=\pgf@y%
\pgf@process{#3}%
\advance\pgf@xb by-\pgf@x%
\advance\pgf@yb by-\pgf@y%
\pgf@yb=-\pgf@yb%
% Normalise a bit
\c@pgf@counta=\pgf@xb%
\ifnum\c@pgf@counta<0\relax%
\c@pgf@counta=-\c@pgf@counta\relax%
\fi%
\c@pgf@countb=\pgf@yb%
\ifnum\c@pgf@countb<0\relax%
\c@pgf@countb=-\c@pgf@countb\relax%
\fi%
\advance\c@pgf@counta by\c@pgf@countb\relax%
\divide\c@pgf@counta by 65536\relax%
\ifnum\c@pgf@counta>0\relax%
\divide\pgf@xb by\c@pgf@counta\relax%
\divide\pgf@yb by\c@pgf@counta\relax%
\fi%
%
% Compute projection
%
\pgf@yc=\pgf@sys@tonumber{\pgf@yb}\pgf@x%
\advance\pgf@yc by\pgf@sys@tonumber{\pgf@xb}\pgf@y%
%
% The orthogonal vector is (\pgf@yb,\pgf@xb)
%
% Setup transformation matrix (this is just to use the matrix
% inversion)
%
\pgfsettransform{{\pgf@sys@tonumber\pgf@ya}{\pgf@sys@tonumber\pgf@yb}{\pgf@sys@tonumber\pgf@xa}{\pgf@sys@tonumber\pgf@xb}{0pt}{0pt}}%
\pgftransforminvert%
\pgf@process{\pgfpointtransformed{\pgfpoint{\pgf@xc}{\pgf@yc}}}%
}%
}
% The intersection of two circles
%
% #1 = center of first circle
% #2 = center of second circle
% #3 = radius of first circle
% #4 = radius of second circle
% #5 = solution number
%
% Returns the intersection of the two circles. If #5 is to "1", the
% first intersection is returned, otherwise the second. If the circles
% do not intersect, an error may occur.
%
% Example:
%
% \pgfpointintersectionofcircles{\pgfpointxy{0}{1}}{\pgfpointxy{1}{0}}{1cm}{1cm}{1}
\def\pgfpointintersectionofcircles#1#2#3#4#5{%
{%
% Store first point in (xa,ya) and radius in xc.
\pgf@process{#1}%
\pgf@xa=\pgf@x%
\pgf@ya=\pgf@y%
\pgfmathsetlength{\pgf@xc}{#3}%
% Store second point in (xb,yb) and radius in yc.
\pgf@process{#2}%
\pgf@xb=\pgf@x%
\pgf@yb=\pgf@y%
\pgfmathsetlength{\pgf@yc}{#4}%
%
% Ok, now make numbers smaller, in case they are too large
%
\c@pgf@counta=1\relax%
\loop%
\pgf@scale@downfalse%
\ifdim\pgf@xc>50pt\relax%
\pgf@scale@downtrue%
\fi%
\ifdim\pgf@yc>50pt\relax%
\pgf@scale@downtrue%
\fi%
\ifpgf@scale@down%
\multiply\c@pgf@counta by2\relax%
\divide\pgf@xa by2\relax%
\divide\pgf@ya by2\relax%
\divide\pgf@xb by2\relax%
\divide\pgf@yb by2\relax%
\divide\pgf@xc by2\relax%
\divide\pgf@yc by2\relax%
\repeat%
% The following code is taken from the Dr. Math internet forum:
%
% Let the centers be: (a,b), (c,d)
% Let the radii be: r, s
%
% e = c - a [difference in x coordinates]
% f = d - b [difference in y coordinates]
% p = sqrt(e^2 + f^2) [distance between centers]
% k = (p^2 + r^2 - s^2)/(2p) [distance from center 1 to line
% joining points of intersection]
% x = a + ek/p + (f/p)sqrt(r^2 - k^2)
% y = b + fk/p - (e/p)sqrt(r^2 - k^2)
% OR
% x = a + ek/p - (f/p)sqrt(r^2 - k^2)
% y = b + fk/p + (e/p)sqrt(r^2 - k^2)
%
% Since we are running low on registers, use
% \dimen0 for e
% \dimen1 for f
% \dimen2 for p
% \dimen3 for p^2
% \dimen4 for k
% \dimen5 for 1/p
% \dimen6 for sqrt(r^2 - k^2)
% \dimen7 for k^2
% \dimen8 for k/p
% \dimen9 for sqrt(r^2 - k^2)/p
% Also note that:
% \pgf@xa for a
% \pgf@ya for b
% \pgf@xb for c
% \pgf@yb for d
% \pgf@xc for r
% \pgf@yc for s
%
% Now:
% e = c - a
\dimen0=\pgf@xb%
\advance\dimen0 by-\pgf@xa%
% f = d - b
\dimen1=\pgf@yb%
\advance\dimen1 by-\pgf@ya%
% p^2 = e^2 + f^2
\pgf@x=\dimen0\relax%
\pgf@x=\pgf@sys@tonumber{\pgf@x}\pgf@x%
\dimen3=\pgf@x%
\pgf@x=\dimen1\relax%
\advance\dimen3 by\pgf@sys@tonumber{\pgf@x}\pgf@x%
% p = sqrt(p^2)
\pgfmathparse{sqrt(\the\dimen3)}%
\dimen2=\pgfmathresult pt%
% 1/p = 1/p
\pgfmathreciprocal@{\pgfmathresult}%
\dimen5=\pgfmathresult pt%
% k = (p^2 + r^2 - s^2)/(2p)
\dimen4=\dimen3\relax%
\pgf@x=\pgf@xc%
\advance\dimen4 by\pgf@sys@tonumber{\pgf@x}\pgf@x\relax%
\pgf@x=\pgf@yc%
\advance\dimen4 by-\pgf@sys@tonumber{\pgf@x}\pgf@x\relax%
\dimen4=.5\dimen4%
\dimen4=\pgf@sys@tonumber{\dimen5}\dimen4%
% dimen7 is k^2
\dimen7=\pgf@sys@tonumber{\dimen4}\dimen4\relax%
% dimen6 is sqrt(r^2 - k^2)
\pgfmathparse{sqrt(\pgf@sys@tonumber{\pgf@xc}\pgf@xc-\the\dimen7)}%
\dimen6=\pgfmathresult pt%
% dimen8 is k/p
\dimen8=\pgf@sys@tonumber{\dimen4}\dimen5\relax%
% dimen9 is sqrt(r^2 - k^2)/p
\dimen9=\pgf@sys@tonumber{\dimen6}\dimen5\relax%
\ifnum#5=1\relax%
% x = a + ek/p + (f/p)sqrt(r^2 - k^2)
\pgf@x=\pgf@xa%
\advance\pgf@x by\pgf@sys@tonumber{\dimen0}\dimen8\relax%
\advance\pgf@x by\pgf@sys@tonumber{\dimen1}\dimen9\relax%
% y = b + fk/p - (e/p)sqrt(r^2 - k^2)
\pgf@y=\pgf@ya%
\advance\pgf@y by\pgf@sys@tonumber{\dimen1}\dimen8\relax%
%temp
\pgf@xb=\pgf@sys@tonumber{\dimen0}\dimen9%
\pgf@xb=-\pgf@xb%
\advance\pgf@y by\pgf@xb\relax%
\else%
% x = a + ek/p - (f/p)sqrt(r^2 - k^2)
\pgf@x=\pgf@xa%
\advance\pgf@x by\pgf@sys@tonumber{\dimen0}\dimen8\relax%
%temp
\pgf@xb=\pgf@sys@tonumber{\dimen1}\dimen9%
\pgf@xb=-\pgf@xb%
\advance\pgf@x by\pgf@xb\relax%
% y = b + fk/p + (e/p)sqrt(r^2 - k^2)
\pgf@y=\pgf@ya%
\advance\pgf@y by\pgf@sys@tonumber{\dimen1}\dimen8\relax%
\advance\pgf@y by\pgf@sys@tonumber{\dimen0}\dimen9\relax%
\fi%
\pgf@x=\c@pgf@counta\pgf@x%
\pgf@y=\c@pgf@counta\pgf@y%
\pgf@process{}% get results outside
}%
}
\newif\ifpgf@scale@down
% Returns point on a line from #2 to #3 at time #1.
%
% #1 = a time, where 0 is the start and 1 is the end
% #2 = start point
% #3 = end point
%
% x = x-component of #1*start + (1-#1)*end
% y = y-component of #1*start + (1-#1)*end
% xa/ya = #1*start + (1-#1)*end
% xb/yb = start point
% xc/yc = end point
%
% Example:
%
% % Middle of (1,1) and (2,3)
% \pgfpathmoveto{\pgfpointlineattime{0.5}{\pgfpointxy{0}{1}}{\pgfpointxy{2}{3}}}
\def\pgfpointlineattime#1#2#3{%
\pgf@process{#3}%
\pgf@xa\pgf@x%
\pgf@ya\pgf@y%
\pgf@xc\pgf@x%
\pgf@yc\pgf@y%
\pgf@process{#2}%
\pgf@xb\pgf@x%
\pgf@yb\pgf@y%
\pgfmathsetmacro\pgf@temp{#1}%
\advance\pgf@xa by-\pgf@x%
\advance\pgf@ya by-\pgf@y%
\global\advance\pgf@x by\pgf@temp\pgf@xa%
\global\advance\pgf@y by\pgf@temp\pgf@ya%
}
% Move point #2 #1 many units in the direction of #3.
%
% #1 = a distance
% #2 = start point
% #3 = end point
%
% Description:
%
% Computes
%
% x/y = start + #1*(normalise(end-start))
%
% and additionally
%
% xa/ya = #1*(normalise(end-start))
% xb/yb = start
% xc/yc = end
%
% Example:
%
% \pgfpathmoveto{\pgfpointlineatdistance{2pt}{\pgfpointxy{0}{1}}{\pgfpointxy{2}{3}}}
% \pgfpathlineto{\pgfpointlineatdistance{3pt}{\pgfpointxy{2}{3}}{\pgfpointxy{0}{1}}}
\def\pgfpointlineatdistance#1#2#3{%
\pgfmathsetlength\pgf@xa{#1}%
\pgf@process{#2}%
\pgf@xb\pgf@x% xb/yb = start point
\pgf@yb\pgf@y%
\pgf@process{#3}%
\pgf@xc\pgf@x%
\pgf@yc\pgf@y%
\global\advance\pgf@x by-\pgf@xb\relax%
\global\advance\pgf@y by-\pgf@yb\relax%
\pgf@process{\pgfpointnormalised{}}% x/y = normalised vector
\pgf@ya=\pgf@xa\relax%
\pgf@xa=\pgf@sys@tonumber{\pgf@x}\pgf@xa%
\pgf@ya=\pgf@sys@tonumber{\pgf@y}\pgf@ya%
\global\pgf@x=\pgf@xb\relax%
\global\pgf@y=\pgf@yb\relax%
\global\advance\pgf@x by\pgf@xa\relax%
\global\advance\pgf@y by\pgf@ya\relax%
}
% Returns point on a curve from #2 to #5 with controls #3 and #4 at time #1.
%
% #1 = a time
% #2 = start point
% #3 = first control point
% #4 = second control point
% #5 = end point
%
% x = x-component of place on the curve at time t
% y = y-component of place on the curve at time t
%
% Additionally, (\pgf@xa,\pgf@ya) and (\pgf@xb,\pgf@yb) will be on a
% tangent to the point on the curve (this can be useful for computing
% a label rotation). (\pgf@xc,\pgf@yc) will be equal to the end
% point. \pgf@time@s will equal the value of #1 and \pgf@time@t will
% equal 1-#1.
%
% Example:
%
% % Middle of (1,1) and (2,3)
% \pgfpathmoveto{\pgfpointcurveattime{0.5}{\pgfpointxy{0}{1}}{\pgfpointxy{1}{1}}{\pgfpointxy{1}{1}}{\pgfpointxy{2}{3}}}
\def\pgfpointcurveattime#1#2#3#4#5{%
\pgfmathparse{#1}%
\let\pgf@time@s=\pgfmathresult%
\global\pgf@x=\pgfmathresult pt%
\global\pgf@x=-\pgf@x%
\advance\pgf@x by 1pt%
\edef\pgf@time@t{\pgf@sys@tonumber{\pgf@x}}%
\pgf@process{#5}%
\pgf@xc=\pgf@x%
\pgf@yc=\pgf@y%
\pgf@process{#4}%
\pgf@xb=\pgf@x%
\pgf@yb=\pgf@y%
\pgf@process{#3}%
\pgf@xa=\pgf@x%
\pgf@ya=\pgf@y%
\pgf@process{#2}%
% First iteration:
\global\pgf@x=\pgf@time@t\pgf@x\global\advance\pgf@x by\pgf@time@s\pgf@xa%
\global\pgf@y=\pgf@time@t\pgf@y\global\advance\pgf@y by\pgf@time@s\pgf@ya%
\pgf@xa=\pgf@time@t\pgf@xa\advance\pgf@xa by\pgf@time@s\pgf@xb%
\pgf@ya=\pgf@time@t\pgf@ya\advance\pgf@ya by\pgf@time@s\pgf@yb%
\pgf@xb=\pgf@time@t\pgf@xb\advance\pgf@xb by\pgf@time@s\pgf@xc%
\pgf@yb=\pgf@time@t\pgf@yb\advance\pgf@yb by\pgf@time@s\pgf@yc%
% Second iteration:
\global\pgf@x=\pgf@time@t\pgf@x\global\advance\pgf@x by\pgf@time@s\pgf@xa%
\global\pgf@y=\pgf@time@t\pgf@y\global\advance\pgf@y by\pgf@time@s\pgf@ya%
\pgf@xa=\pgf@time@t\pgf@xa\advance\pgf@xa by\pgf@time@s\pgf@xb%
\pgf@ya=\pgf@time@t\pgf@ya\advance\pgf@ya by\pgf@time@s\pgf@yb%
% Save x/y
\pgf@xb=\pgf@x%
\pgf@yb=\pgf@y%
% Third iteration:
\global\pgf@x=\pgf@time@t\pgf@x\global\advance\pgf@x by\pgf@time@s\pgf@xa%
\global\pgf@y=\pgf@time@t\pgf@y\global\advance\pgf@y by\pgf@time@s\pgf@ya%
}
% Returns point on an arc at a certain "time"
%
% #1 = a time
% #2 = center of a ellipse
% #3 = 0-degree axis of the ellipse
% #4 = 90-degree axis of the ellipse
% #5 = start angle of an arc on the ellipse
% #6 = end angle of an arc on the ellipse
%
% Result:
%
% \pgf@x = x-component of place on the arc at time t
% \pgf@y = y-component of place on the arc at time t
%
% Additionally, (\pgf@xa,\pgf@ya) will be a tangent to the
% point on the arc (this can be useful for computing a label rotation).
%
% Example:
%
% \pgfpointarcaxesattime{0.25}{\pgfpoint{1cm}{1cm}}{\pgfpoint{1cm}{0cm}}{\pgfpoint{0cm}{1cm}}{1cm}{30}{40}
\def\pgfpointarcaxesattime#1#2#3#4#5#6{%
\pgfmathsetmacro\pgf@angle@start{#5}%
\pgfmathsetmacro\pgf@angle@end{#6}%
\pgfmathparse{#1}%
\global\pgf@x=\pgfmathresult pt%
\global\pgf@x=-\pgf@x%
\advance\pgf@x by 1pt%
\pgfmathsetmacro\pgf@angle@mid{\pgf@angle@end*\pgfmathresult+\pgf@angle@start*\pgf@sys@tonumber{\pgf@x}}%
\pgfmathcos@{\pgf@angle@mid}%
\let\pgf@angle@cos\pgfmathresult%
\pgfmathsin@{\pgf@angle@mid}%
\let\pgf@angle@sin\pgfmathresult%
\pgf@process{#3}%
\edef\pgf@angle@zero@axis{\noexpand\pgfqpoint{\the\pgf@x}{\the\pgf@y}}
\pgf@process{#4}%
\edef\pgf@angle@ninety@axis{\noexpand\pgfqpoint{\the\pgf@x}{\the\pgf@y}}
% Compute tangent
\pgf@process{\pgfpointadd{\pgfpointscale{\pgf@angle@sin}{\pgf@angle@zero@axis}}%
{\pgfpointscale{-\pgf@angle@cos}{\pgf@angle@ninety@axis}}}%
\ifdim\pgf@angle@start pt>\pgf@angle@end pt%
\pgf@xa=\pgf@x%
\pgf@ya=\pgf@y%
\else%
\pgf@xa=-\pgf@x%
\pgf@ya=-\pgf@y%
\fi%
% Compute position
\pgf@process{\pgfpointadd{#2}{%
\pgfpointadd{\pgfpointscale{\pgf@angle@cos}{\pgf@angle@zero@axis}}%
{\pgfpointscale{\pgf@angle@sin}{\pgf@angle@ninety@axis}}}}%
}
% Internal registers
\newdimen\pgf@xx
\newdimen\pgf@xy
\newdimen\pgf@yx
\newdimen\pgf@yy
\newdimen\pgf@zx
\newdimen\pgf@zy
% A polar coordinate
%
% #1 = a degree
% #2 = a radius -- either a dimension or two dimensions separated by
% " and ".
%
% x = (first dimension in #2) * cos(#1)
% y = (second dimension in #2) * sin(#2)
%
% Example:
%
% \pgfpathmoveto{\pgfpointpolar{30}{1cm}}
% \pgfpathlineto{\pgfpointpolar{30}{1cm and 2cm}}
\def\pgfpointpolar#1#2{%
\pgfutil@in@{and }{#2}%
\ifpgfutil@in@%
\pgf@polar@#2\@@%
\else%
\pgf@polar@#2 and #2\@@%
\fi%
\pgfmathparse{#1}%
\let\pgfpoint@angle=\pgfmathresult%
\pgfmathcos@{\pgfpoint@angle}%
\global\pgf@x=\pgfmathresult\pgf@x%
\pgfmathsin@{\pgfpoint@angle}%
\global\pgf@y=\pgfmathresult\pgf@y%
}
\def\pgf@polar@#1and #2\@@{%
\pgfmathsetlength{\pgf@y}{#2}%
\pgfmathsetlength{\pgf@x}{#1}%
}
% Quick version of the polar coordinate method
\def\pgfqpointpolar#1#2{%
\global\pgf@x=#2%
\global\pgf@y=\pgf@x%
\pgfmathcos@{#1}%
\global\pgf@x=\pgfmathresult\pgf@x%
\pgfmathsin@{#1}%
\global\pgf@y=\pgfmathresult\pgf@y\relax%
}
% A polar coordinate in the xy plane.
%
% #1 = a degree
% #2 = a radius given as a number or two radii
%
% result = (first dim in #2) * x-vector * cos(#1) +
% (second dim in #2) * y-vector * sin(#1)
%
% Example:
%
% \pgfpathmoveto{\pgfpointpolarxy{30}{2}}
\def\pgfpointpolarxy#1#2{%
\pgfutil@in@{and }{#2}%
\ifpgfutil@in@%
\pgf@polarxy@#2\@@%
\else%
\pgf@polarxy@#2and #2\@@%
\fi%
\pgfmathparse{#1}%
\let\pgfpoint@angle=\pgfmathresult%
\pgfmathcos@{\pgfpoint@angle}%
\pgf@xa=\pgfmathresult\pgf@xa%
\pgfmathsin@{\pgfpoint@angle}%
\pgf@ya=\pgfmathresult\pgf@ya%
\global\pgf@x=\pgf@sys@tonumber{\pgf@xa}\pgf@xx%
\global\advance\pgf@x by \pgf@sys@tonumber{\pgf@ya}\pgf@yx%
\global\pgf@y=\pgf@sys@tonumber{\pgf@xa}\pgf@xy%
\global\advance\pgf@y by \pgf@sys@tonumber{\pgf@ya}\pgf@yy}
\def\pgf@polarxy@#1and #2\@@{%
\pgfmathsetlength{\pgf@xa}{#1}%
\pgfmathsetlength{\pgf@ya}{#2}%
}
% A cylindrical coordinate.
%
% #1 = a degree
% #2 = a radius given as a number
% #3 = a height given as a number
%
% result = #2*(x-vector * cos(#1) + y-vector * sin(#1)) + #3*z-vector
%
% Example:
%
% \pgfpathmoveto{\pgfpointcylindrical{30}{2}{1}}
\def\pgfpointcylindrical#1#2#3{%
\pgfpointpolarxy{#1}{#2}%
\pgfmathparse{#3}%
\global\advance\pgf@x by \pgfmathresult\pgf@zx%
\global\advance\pgf@y by \pgfmathresult\pgf@zy}
% A spherical coordinate.
%
% #1 = a longitude
% #2 = a latitude
% #3 = a radius
%
% result = #3*(cos(#2)*(x-vector * cos(#1) + y-vector * sin(#1)) + sin(#2)*z-vector)
%
% Example:
%
% \pgfpathmoveto{\pgfpointspherical{30}{30}{2}}
\def\pgfpointspherical#1#2#3{%
\pgfmathparse{#1}%
\let\pgfpoint@angle=\pgfmathresult%
\pgfmathsin@{\pgfpoint@angle}%
\pgf@xb=\pgfmathresult\pgf@xx%
\pgf@yb=\pgfmathresult\pgf@xy%
\pgfmathcos@{\pgfpoint@angle}%
\advance\pgf@xb by \pgfmathresult\pgf@yx%
\advance\pgf@yb by \pgfmathresult\pgf@yy%
%
\pgfmathparse{#2}%
\let\pgfpoint@angle=\pgfmathresult%
\pgfmathcos@{\pgfpoint@angle}%
\pgf@xc=\pgfmathresult\pgf@xb%
\pgf@yc=\pgfmathresult\pgf@yb%
\pgfmathsin@{\pgfpoint@angle}%
\advance\pgf@xc by \pgfmathresult\pgf@zx%
\advance\pgf@yc by \pgfmathresult\pgf@zy%
\pgfmathparse{#3}%
\global\pgf@x=\pgfmathresult\pgf@xc%
\global\pgf@y=\pgfmathresult\pgf@yc\relax%
}
% Store the vector #1 * x-vec + #2 * y-vec
%
% #1 = a factor for the x-vector
% #2 = a factor for the y-vector
%
% x = x-component of result vector
% y = y-component of result vector
%
% Description:
%
% This command can be used to create a new coordinate system
% without using the rotate/translate/scale commands. This
% may be useful, if you do not want arrows and line width to
% be scaled/transformed together with the coordinate system.
%
% Example:
%
% % Create a slanted rectangle
%
% \pgfsetxvec{\pgfpoint{1cm}{1cm}}
% \pgfsetyvec{\pgfpoint{0cm}{1cm}}
%
% \pgfpathmoveto{\pgfpointxy{0}{0}}
% \pgfpathlineto{\pgfpointxy{1}{0}}
% \pgfpathlineto{\pgfpointxy{1}{1}}
% \pgfpathlineto{\pgfpointxy{0}{1}}
% \pgfclosestroke
\def\pgfpointxy#1#2{%
\pgfmathparse{#1}%
\let\pgftemp@x=\pgfmathresult%
\pgfmathparse{#2}%
\let\pgftemp@y=\pgfmathresult%
\global\pgf@x=\pgftemp@x\pgf@xx%
\global\advance\pgf@x by \pgftemp@y\pgf@yx%
\global\pgf@y=\pgftemp@x\pgf@xy%
\global\advance\pgf@y by \pgftemp@y\pgf@yy}
% "Quick" variant for \pgfpointxy.
%
% Only numbers without unit are allowed here.
\def\pgfqpointxy#1#2{%
\global\pgf@x=#1\pgf@xx%
\global\advance\pgf@x by #2\pgf@yx%
\global\pgf@y=#1\pgf@xy%
\global\advance\pgf@y by #2\pgf@yy}
% Store the vector #1 * x-vec + #2 * y-vec + #3 * z-vec
%
% #1 = a factor for the x-vector
% #2 = a factor for the y-vector
% #3 = a factor for the z-vector
%
% x = x-component of result vector
% y = y-component of result vector
%
%
% Description:
%
% This command allows you to use a 3d coordinate system.
%
%
% Example:
%
% % Draw a cubus
%
% \pgfline{\pgfpointxyz{0}{0}{0}}{\pgfpointxyz{0}{0}{1}}
% \pgfline{\pgfpointxyz{0}{1}{0}}{\pgfpointxyz{0}{1}{1}}
% \pgfline{\pgfpointxyz{1}{0}{0}}{\pgfpointxyz{1}{0}{1}}
% \pgfline{\pgfpointxyz{1}{1}{0}}{\pgfpointxyz{1}{1}{1}}
% \pgfline{\pgfpointxyz{0}{0}{0}}{\pgfpointxyz{0}{1}{0}}
% \pgfline{\pgfpointxyz{0}{0}{1}}{\pgfpointxyz{0}{1}{1}}
% \pgfline{\pgfpointxyz{1}{0}{0}}{\pgfpointxyz{1}{1}{0}}
% \pgfline{\pgfpointxyz{1}{0}{1}}{\pgfpointxyz{1}{1}{1}}
% \pgfline{\pgfpointxyz{0}{0}{0}}{\pgfpointxyz{1}{0}{0}}
% \pgfline{\pgfpointxyz{0}{0}{1}}{\pgfpointxyz{1}{0}{1}}
% \pgfline{\pgfpointxyz{0}{1}{0}}{\pgfpointxyz{1}{1}{0}}
% \pgfline{\pgfpointxyz{0}{1}{1}}{\pgfpointxyz{1}{1}{1}}
\def\pgfpointxyz#1#2#3{%
\pgfmathparse{#1}%
\let\pgftemp@x=\pgfmathresult%
\pgfmathparse{#2}%
\let\pgftemp@y=\pgfmathresult%
\pgfmathparse{#3}%
\let\pgftemp@z=\pgfmathresult%
\global\pgf@x=\pgftemp@x\pgf@xx%
\global\advance\pgf@x by \pgftemp@y\pgf@yx%
\global\advance\pgf@x by \pgftemp@z\pgf@zx%
\global\pgf@y=\pgftemp@x\pgf@xy%
\global\advance\pgf@y by \pgftemp@y\pgf@yy%
\global\advance\pgf@y by \pgftemp@z\pgf@zy}
% "Quick" variant for \pgfpointxyz.
%
% Only numbers without unit are allowed.
\def\pgfqpointxyz#1#2#3{%
\global\pgf@x=#1\pgf@xx%
\global\advance\pgf@x by #2\pgf@yx%
\global\advance\pgf@x by #3\pgf@zx%
\global\pgf@y=#1\pgf@xy%
\global\advance\pgf@y by #2\pgf@yy%
\global\advance\pgf@y by #3\pgf@zy}
% Set the x-vector
%
% #1 = a point the is the new x-vector
%
% Example:
%
% \pgfsetxvec{\pgfpoint{1cm}{0cm}}
\def\pgfsetxvec#1{%
\pgf@process{#1}%
\pgf@xx=\pgf@x%
\pgf@xy=\pgf@y%
\ignorespaces}
% Set the y-vector
%
% #1 = a point the is the new y-vector
%
% Example:
%
% \pgfsetyvec{\pgfpoint{0cm}{1cm}}
\def\pgfsetyvec#1{%
\pgf@process{#1}%
\pgf@yx=\pgf@x%
\pgf@yy=\pgf@y%
\ignorespaces}
% Set the z-vector
%
% #1 = a point the is the new z-vector
%
% Example:
%
% \pgfsetzvec{\pgfpoint{-0.385cm}{-0.385cm}}
\def\pgfsetzvec#1{%
\pgf@process{#1}%
\pgf@zx=\pgf@x%
\pgf@zy=\pgf@y%
\ignorespaces}
% Default values
\pgfsetxvec{\pgfpoint{1cm}{0cm}}
\pgfsetyvec{\pgfpoint{0cm}{1cm}}
\pgfsetzvec{\pgfpoint{-0.385cm}{-0.385cm}}
% Normalise a point.
%
% #1 = point with coordinates (a,b)
%
% x = a/\sqrt(a*a+b*b)
% y = b/\sqrt(a*a+b*b)
%
% Example:
%
% \pgfpointnormalised{\pgfpointxy{2}{1}}
\def\pgfpointnormalised#1{%
\pgf@process{#1}%
\pgfmathatantwo{\the\pgf@y}{\the\pgf@x}%
\let\pgf@tmp=\pgfmathresult%
\pgfmathcos@{\pgf@tmp}%
\pgf@x=\pgfmathresult pt\relax%
\pgfmathsin@{\pgf@tmp}%
\pgf@y=\pgfmathresult pt\relax%
}
% A point on a rectangle in a certain direction.
%
% #1 = a point pointing in some direction (length should be about 1pt,
% but need not be exact)
% #2 = upper right corner of a rectangle centered at the origin
%
% Returns the intersection of a line starting at the origin going in
% the given direction and the rectangle's border.
%
% Example:
%
% \pgfpointborderrectangle{\pgfpointnormalised{\pgfpointxy{2}{1}}
% {\pgfpoint{1cm}{2cm}}
\def\pgfpointborderrectangle#1#2{%
\pgf@process{#2}%
\pgf@xb=\pgf@x%
\pgf@yb=\pgf@y%
\pgf@process{#1}%
% Ok, let's find out about the direction:
\pgf@xa=\pgf@x%
\pgf@ya=\pgf@y%
\ifnum\pgf@xa<0\relax% move into first quadrant
\global\pgf@x=-\pgf@x%
\fi%
\ifnum\pgf@ya<0\relax%
\global\pgf@y=-\pgf@y%
\fi%
\pgf@xc=.125\pgf@x%
\pgf@yc=.125\pgf@y%
\c@pgf@counta=\pgf@xc%
\c@pgf@countb=\pgf@yc%
\ifnum\c@pgf@countb<\c@pgf@counta%
\ifnum\c@pgf@counta<255\relax%
\global\pgf@y=\pgf@yb\relax%
\global\pgf@x=0pt\relax%
\else%
\pgf@xc=8192pt%
\divide\pgf@xc by\c@pgf@counta% \pgf@xc = 1/\pgf@x
\global\pgf@y=\pgf@sys@tonumber{\pgf@xc}\pgf@y%
\global\pgf@y=\pgf@sys@tonumber{\pgf@xb}\pgf@y%
\ifnum\pgf@y<\pgf@yb%
\global\pgf@x=\pgf@xb%
\else% rats, calculate intersection on upper side
\ifnum\c@pgf@countb<255\relax%
\global\pgf@x=\pgf@xb\relax%
\global\pgf@y=0pt\relax%
\else%
\pgf@yc=8192pt%
\divide\pgf@yc by\c@pgf@countb% \pgf@xc = 1/\pgf@x
\global\pgf@x=\pgf@sys@tonumber{\pgf@yc}\pgf@x%
\global\pgf@x=\pgf@sys@tonumber{\pgf@yb}\pgf@x%
\global\pgf@y=\pgf@yb%
\fi%
\fi%
\fi%
\else%
\ifnum\c@pgf@countb<255\relax%
\global\pgf@x=\pgf@xb\relax%
\global\pgf@y=0pt\relax%
\else%
\pgf@yc=8192pt%
\divide\pgf@yc by\c@pgf@countb% \pgf@xc = 1/\pgf@x
\global\pgf@x=\pgf@sys@tonumber{\pgf@yc}\pgf@x%
\global\pgf@x=\pgf@sys@tonumber{\pgf@yb}\pgf@x%
\ifnum\pgf@x<\pgf@xb%
\global\pgf@y=\pgf@yb%
\else%
\ifnum\c@pgf@counta<255\relax%
\global\pgf@y=\pgf@yb\relax%
\global\pgf@x=0pt\relax%
\else%
\pgf@xc=8192pt%
\divide\pgf@xc by\c@pgf@counta% \pgf@xc = 1/\pgf@x
\global\pgf@y=\pgf@sys@tonumber{\pgf@xc}\pgf@y%
\global\pgf@y=\pgf@sys@tonumber{\pgf@xb}\pgf@y%
\global\pgf@x=\pgf@xb%
\fi%
\fi%
\fi%
\fi%
\ifnum\pgf@xa<0\relax\global\pgf@x=-\pgf@x\fi%
\ifnum\pgf@ya<0\relax\global\pgf@y=-\pgf@y\fi%
}
% An approximation to a point on an ellipse in a certain
% direction. Will be exact only if the ellipse is a circle.
%
% #1 = a point pointing in some direction
% #2 = upper right corner of a bounding box for the ellipse
%
% Returns the intersection of a line starting at the origin going in
% the given direction and the ellipses border.
%
% Example:
%
% \pgfpointborderellipse{\pgfpointnormalised{\pgfpointxy{2}{1}}
% {\pgfpoint{1cm}{2cm}}
\def\pgfpointborderellipse#1#2{%
\pgf@process{#2}%
\pgf@xa=\pgf@x%
\pgf@ya=\pgf@y%
\ifdim\pgf@xa=\pgf@ya% circle. that's easy!
\pgf@process{\pgfpointnormalised{#1}}%
\global\pgf@x=\pgf@sys@tonumber{\pgf@xa}\pgf@x%
\global\pgf@y=\pgf@sys@tonumber{\pgf@xa}\pgf@y%
\else%
\ifdim\pgf@xa<\pgf@ya%
% Ok, first, let's compute x/y:
\c@pgf@countb=\pgf@ya%
\divide\c@pgf@countb by65536\relax%
\global\divide\pgf@x by\c@pgf@countb%
\global\divide\pgf@y by\c@pgf@countb%
\pgf@xc=\pgf@x%
\pgf@yc=8192pt%
\global\pgf@y=.125\pgf@y%
\c@pgf@countb=\pgf@y%
\divide\pgf@yc by\c@pgf@countb%
\pgf@process{#1}%
\global\pgf@y=\pgf@sys@tonumber{\pgf@yc}\pgf@y%
\global\pgf@y=\pgf@sys@tonumber{\pgf@xc}\pgf@y%
\pgf@process{\pgfpointnormalised{}}%
\global\pgf@x=\pgf@sys@tonumber{\pgf@xa}\pgf@x%
\global\pgf@y=\pgf@sys@tonumber{\pgf@ya}\pgf@y%
\else%
% Ok, now let's compute y/x:
\c@pgf@countb=\pgf@xa%
\divide\c@pgf@countb by65536\relax%
\global\divide\pgf@x by\c@pgf@countb%
\global\divide\pgf@y by\c@pgf@countb%
\pgf@yc=\pgf@y%
\pgf@xc=8192pt%
\global\pgf@x=.125\pgf@x%
\c@pgf@countb=\pgf@x%
\divide\pgf@xc by\c@pgf@countb%
\pgf@process{#1}%
\global\pgf@x=\pgf@sys@tonumber{\pgf@yc}\pgf@x%
\global\pgf@x=\pgf@sys@tonumber{\pgf@xc}\pgf@x%
\pgf@process{\pgfpointnormalised{}}%
\global\pgf@x=\pgf@sys@tonumber{\pgf@xa}\pgf@x%
\global\pgf@y=\pgf@sys@tonumber{\pgf@ya}\pgf@y%
\fi%
\fi%
}
% Extract the x-coordinate of a point to a dimensions
%
% #1 = a TeX dimension
% #2 = a point
%
% Example:
%
% \newdimen\mydim
% \pgfextractx{\mydim}{\pgfpoint{2cm}{4pt}}
% % \mydim is now 2cm
\def\pgfextractx#1#2{%
\pgf@process{#2}%
#1=\pgf@x\relax}
% Extract the y-coordinate of a point to a dimensions
%
% #1 = a TeX dimension
% #2 = a point
%
% Example:
%
% \newdimen\mydim
% \pgfextracty{\mydim}{\pgfpoint{2cm}{4pt}}
% % \mydim is now 4pt
\def\pgfextracty#1#2{%
\pgf@process{#2}%
#1=\pgf@y\relax}
% Stores the most recently used (x,y) coordinates into two macros, #1 and #2.
\def\pgfgetlastxy#1#2{%
\edef#1{\the\pgf@x}%
\edef#2{\the\pgf@y}%
}%
\def\pgf@def#1#2#3{\expandafter\def\csname pgf@#1#2\endcsname{#3}}
\pgf@def{cosfrac}{0}{1}
\pgf@def{cosfrac}{1}{0.99995} \pgf@def{cosfrac}{2}{0.9998}
\pgf@def{cosfrac}{3}{0.99955} \pgf@def{cosfrac}{4}{0.999201}
\pgf@def{cosfrac}{5}{0.998752} \pgf@def{cosfrac}{6}{0.998205}
\pgf@def{cosfrac}{7}{0.997559} \pgf@def{cosfrac}{8}{0.996815}
\pgf@def{cosfrac}{9}{0.995974} \pgf@def{cosfrac}{10}{0.995037}
\pgf@def{cosfrac}{11}{0.994004} \pgf@def{cosfrac}{12}{0.992877}
\pgf@def{cosfrac}{13}{0.991656} \pgf@def{cosfrac}{14}{0.990342}
\pgf@def{cosfrac}{15}{0.988936} \pgf@def{cosfrac}{16}{0.987441}
\pgf@def{cosfrac}{17}{0.985856} \pgf@def{cosfrac}{18}{0.984183}
\pgf@def{cosfrac}{19}{0.982424} \pgf@def{cosfrac}{20}{0.980581}
\pgf@def{cosfrac}{21}{0.978653} \pgf@def{cosfrac}{22}{0.976644}
\pgf@def{cosfrac}{23}{0.974555} \pgf@def{cosfrac}{24}{0.972387}
\pgf@def{cosfrac}{25}{0.970143} \pgf@def{cosfrac}{26}{0.967823}
\pgf@def{cosfrac}{27}{0.965429} \pgf@def{cosfrac}{28}{0.962964}
\pgf@def{cosfrac}{29}{0.960429} \pgf@def{cosfrac}{30}{0.957826}
\pgf@def{cosfrac}{31}{0.955157} \pgf@def{cosfrac}{32}{0.952424}
\pgf@def{cosfrac}{33}{0.949629} \pgf@def{cosfrac}{34}{0.946773}
\pgf@def{cosfrac}{35}{0.943858} \pgf@def{cosfrac}{36}{0.940887}
\pgf@def{cosfrac}{37}{0.937862} \pgf@def{cosfrac}{38}{0.934784}
\pgf@def{cosfrac}{39}{0.931655} \pgf@def{cosfrac}{40}{0.928477}
\pgf@def{cosfrac}{41}{0.925252} \pgf@def{cosfrac}{42}{0.921982}
\pgf@def{cosfrac}{43}{0.918669} \pgf@def{cosfrac}{44}{0.915315}
\pgf@def{cosfrac}{45}{0.911922} \pgf@def{cosfrac}{46}{0.90849}
\pgf@def{cosfrac}{47}{0.905024} \pgf@def{cosfrac}{48}{0.901523}
\pgf@def{cosfrac}{49}{0.89799} \pgf@def{cosfrac}{50}{0.894427}
\pgf@def{cosfrac}{51}{0.890835} \pgf@def{cosfrac}{52}{0.887217}
\pgf@def{cosfrac}{53}{0.883573} \pgf@def{cosfrac}{54}{0.879905}
\pgf@def{cosfrac}{55}{0.876216} \pgf@def{cosfrac}{56}{0.872506}
\pgf@def{cosfrac}{57}{0.868777} \pgf@def{cosfrac}{58}{0.865031}
\pgf@def{cosfrac}{59}{0.861269} \pgf@def{cosfrac}{60}{0.857493}
\pgf@def{cosfrac}{61}{0.853704} \pgf@def{cosfrac}{62}{0.849903}
\pgf@def{cosfrac}{63}{0.846092} \pgf@def{cosfrac}{64}{0.842271}
\pgf@def{cosfrac}{65}{0.838444} \pgf@def{cosfrac}{66}{0.834609}
\pgf@def{cosfrac}{67}{0.83077} \pgf@def{cosfrac}{68}{0.826927}
\pgf@def{cosfrac}{69}{0.82308} \pgf@def{cosfrac}{70}{0.819232}
\pgf@def{cosfrac}{71}{0.815383} \pgf@def{cosfrac}{72}{0.811534}
\pgf@def{cosfrac}{73}{0.807687} \pgf@def{cosfrac}{74}{0.803842}
\pgf@def{cosfrac}{75}{0.8} \pgf@def{cosfrac}{76}{0.796162}
\pgf@def{cosfrac}{77}{0.792329} \pgf@def{cosfrac}{78}{0.788502}
\pgf@def{cosfrac}{79}{0.784682} \pgf@def{cosfrac}{80}{0.780869}
\pgf@def{cosfrac}{81}{0.777064} \pgf@def{cosfrac}{82}{0.773268}
\pgf@def{cosfrac}{83}{0.769481} \pgf@def{cosfrac}{84}{0.765705}
\pgf@def{cosfrac}{85}{0.761939} \pgf@def{cosfrac}{86}{0.758185}
\pgf@def{cosfrac}{87}{0.754443} \pgf@def{cosfrac}{88}{0.750714}
\pgf@def{cosfrac}{89}{0.746997} \pgf@def{cosfrac}{90}{0.743294}
\pgf@def{cosfrac}{91}{0.739605} \pgf@def{cosfrac}{92}{0.735931}
\pgf@def{cosfrac}{93}{0.732272} \pgf@def{cosfrac}{94}{0.728628}
\pgf@def{cosfrac}{95}{0.724999} \pgf@def{cosfrac}{96}{0.721387}
\pgf@def{cosfrac}{97}{0.717792} \pgf@def{cosfrac}{98}{0.714213}
\pgf@def{cosfrac}{99}{0.710651} \pgf@def{cosfrac}{100}{0.707107}
% Forward declarations for nonlinear stuff (have no effect till module
% nonlineartransformations is loaded)
\let\pgfpointtransformednonlinear\pgfpointtransformed
\endinput