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1%D \module
2%D   [       file=pack-pos,
3%D        version=2010.11.17 % real old code, updated a bit
4%D          title=\CONTEXT\ Packaging Macros,
5%D       subtitle=Positioning,
6%D         author=Hans Hagen,
7%D           date=\currentdate,
8%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
9%C
10%C This module is part of the \CONTEXT\ macro||package and is
11%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
12%C details.
13
14\writestatus{loading}{ConTeXt Packaging Macros / Positioning}
15
16\unprotect
17
18% An old but still usefull mechanism:
19%
20% \ruledvbox{\startpositioning
21%     \position(1,1){test}
22%     \position[xstep=relative](1,1){test}
23%     \position[ystep=relative](3,-1){test}
24%     \position(10,10){test}
25% \stoppositioning}
26%
27% watch out: rather global
28
29\installcorenamespace {positioning}
30
31\installcommandhandler \??positioning {positioning} \??positioning
32
33\setuppositioning
34  [\c!state=\v!start,
35   \c!unit=\s!cm,
36   \c!factor=\plusone,
37   \c!scale =\plusone,
38   \c!xfactor=\positioningparameter\c!factor,
39   \c!yfactor=\positioningparameter\c!factor,
40   \c!xscale=\positioningparameter\c!scale,
41   \c!yscale=\positioningparameter\c!scale,
42   \c!xstep=\v!absolute,
43   \c!ystep=\v!absolute,
44   \c!xoffset=\zeropoint,
45   \c!yoffset=\zeropoint]
46
47\newdimen\d_pack_positioning_x_position
48\newdimen\d_pack_positioning_y_position
49\newdimen\d_pack_positioning_x_dimension
50\newdimen\d_pack_positioning_y_dimension
51\newdimen\d_pack_positioning_x_offset
52\newdimen\d_pack_positioning_y_offset
53
54\newbox\b_pack_positioning
55
56\unexpanded\def\startpositioning
57  {\bgroup
58   \dodoubleempty\pack_positioning_start}
59
60\def\pack_positioning_start[#1][#2]%
61  {\ifsecondargument
62     \edef\currentpositioning{#1}%
63     \setupcurrentpositioning[#2]%
64   \else\iffirstargument
65     \doifelseassignment{#1}
66       {\let\currentpositioning\empty
67        \setupcurrentpositioning[#1]}%
68       {\edef\currentpositioning{#1}}%
69   \else
70     \let\currentpositioning\empty
71   \fi\fi
72   \d_pack_positioning_x_position \zeropoint
73   \d_pack_positioning_y_position \zeropoint
74   \d_pack_positioning_x_dimension\zeropoint
75   \d_pack_positioning_y_dimension\zeropoint
76   \d_pack_positioning_x_offset   \zeropoint
77   \d_pack_positioning_y_offset   \zeropoint
78   \hfuzz\paperwidth
79   \vfuzz\paperheight
80   \setbox\b_pack_positioning\hbox\bgroup
81   \ignorespaces}
82
83\unexpanded\def\stoppositioning
84  {\removeunwantedspaces
85   \doifnot{\positioningparameter\c!offset}\v!yes
86     {\global\d_pack_positioning_x_offset\zeropoint
87      \global\d_pack_positioning_y_offset\zeropoint}%
88   \global\advance\d_pack_positioning_x_dimension\d_pack_positioning_x_offset
89   \global\advance\d_pack_positioning_y_dimension\d_pack_positioning_y_offset
90   \egroup
91   \vbox to \d_pack_positioning_y_dimension
92     {\vskip\d_pack_positioning_y_offset
93      \hbox to \d_pack_positioning_x_dimension
94        {\hskip\d_pack_positioning_x_offset
95         \box\b_pack_positioning
96         \hfill}
97      \vfill}%
98   \egroup}
99
100\unexpanded\def\pack_positioning_calculate#1#2#3#4#5#6#7#8#9%
101  {\setdimensionwithunit\scratchdimen{#1}{\positioningparameter\c!unit}%
102   \scratchdimen\positioningparameter#8\scratchdimen
103   \scratchdimen\positioningparameter#9\scratchdimen
104   \advance\scratchdimen\positioningparameter#4\relax
105   % == \scratchdimen\dimexpr#8\dimexpr#9\scratchdimen\relax+#4\relax
106   \doif{\positioningparameter#2}\v!relative
107     {\advance\scratchdimen#3%
108      \letpositioningparameter#4\zeropoint}%
109   #3\scratchdimen
110   \doifnot{\positioningparameter\c!state}\v!overlay
111     {\scratchdimen\dimexpr#5\nextbox+#3\relax
112      \ifdim           #3<-#7\relax \global#7-#3\relax    \fi
113      \ifdim\scratchdimen> #6\relax \global#6\scratchdimen\fi}}
114
115\unexpanded\def\position
116  {\bgroup
117   \dosingleempty\pack_positioning_position}
118
119\def\pack_positioning_position[#1]#2(#3,#4)%
120  {\iffirstargument
121     \setupcurrentpositioning[#1]%
122   \fi
123   \removeunwantedspaces
124   \dowithnextbox{\pack_positioning_position_indeed{#3}{#4}}\hbox}
125
126\def\pack_positioning_position_indeed#1#2%
127  {\dontcomplain
128   \pack_positioning_calculate
129     {#1}%
130     \c!xstep
131     \d_pack_positioning_x_position
132     \c!xoffset
133     \wd
134     \d_pack_positioning_x_dimension
135     \d_pack_positioning_x_offset
136     \c!xscale
137     \c!xfactor
138   \pack_positioning_calculate
139     {#2}%
140     \c!ystep
141     \d_pack_positioning_y_position
142     \c!yoffset
143     \htdp
144     \d_pack_positioning_y_dimension
145     \d_pack_positioning_y_offset
146     \c!yscale
147     \c!yfactor
148   \vbox to \zeropoint
149     {\offinterlineskip % else we get an empty line
150      \vskip\d_pack_positioning_y_position
151      \hbox to \zeropoint
152        {\hskip\d_pack_positioning_x_position
153         \box\nextbox
154         \hss}
155      \vss}%
156   \normalexpanded
157     {\egroup
158      \d_pack_positioning_x_position\the\d_pack_positioning_x_position
159      \d_pack_positioning_y_position\the\d_pack_positioning_y_position
160      \setexpandedpositioningparameter\c!xoffset{\the\dimexpr\positioningparameter\c!xoffset}%
161      \setexpandedpositioningparameter\c!yoffset{\the\dimexpr\positioningparameter\c!yoffset}}%
162   \ignorespaces}
163
164\protect \endinput
165