1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
%D \module
%D [ file=colo-ext, % mostof thsi code used to be in colo-ini.tex
%D version=1997.04.01,
%D title=\CONTEXT\ Color Macros,
%D subtitle=Extras,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
\writestatus{loading}{ConTeXt Color Macros / Extras}
\unprotect
%D \macros
%D {negatecolorcomponent, negativecolorbox}
%D
%D Sometimes, especially when we deal with typesetting
%D devices, we want to reverse the color scheme. Instead of
%D recalculating all those colors, we use a quick and dirty
%D approach:
%D
%D \starttyping
%D \negativecolorbox0
%D \stoptyping
%D
%D will negate the colors in box zero.
\def\negatecolorbox#1%
{\setbox#1\hbox
{\startnegativeproperty % might change
\startcolor[white]\vrule\!!height\ht#1\!!depth\dp#1\!!width\wd#1\stopcolor
\hskip-\wd#1%
\box#1%
\stopnegativeproperty}}
%D There are in principle two ways to handle overprint: bound to colors
%D or independent. For the moment we only support independent overprint
%D handling. Here we deal with a per-document setting.
%D We can move the stack and attribute setting to the \LUA\ end.
\def\registercolorintent#1#2%
{\setevalue{\??qi:#1}{\attribute\colorintentattribute\ctxcommand{registercolorintent('#2')} }}
\def\dotriggercolorintent
{\ctxcommand{enablecolorintents()}%
\gdef\dotriggercolorintent##1{\csname\??qi:##1\endcsname}%
\dotriggercolorintent}
\registercolorintent{knockout} {knockout}
\registercolorintent{overprint}{overprint}
\installattributestack\colorintentattribute
\setevalue{\??qi:\v!none}{\attribute\colorintentattribute\attributeunsetvalue} % or reset? used at all?
\unexpanded\def\startcolorintent[#1]%
{\pushattribute\colorintentattribute
\dotriggercolorintent{#1}}
\unexpanded\def\stopcolorintent
{\popattribute\colorintentattribute}
\unexpanded\def\startoverprint{\startcolorintent[\v!overprint]}
\unexpanded\def\stopoverprint {\stopcolorintent}
\unexpanded\def\startknockout {\startcolorintent[\v!knockout ]}
\unexpanded\def\stopknockout {\stopcolorintent}
\let\starttextcolorintent\relax
\let\stoptextcolorintent \relax
\setupcolors
[\c!overprint=\v!no]
\appendtoks
\dosettextcolorintent
\to \everysetupcolors
\def\dosettextcolorintent
{\doifnot\@@clintent\v!none
{\xdef\starttextcolorintent{\noexpand\dotriggercolorintent{\@@clintent}}%
\glet\dosettextcolorintent\relax
\dotriggercolorintent\@@clintent}}
\appendtoks \starttextcolorintent \to \everystarttextproperties
\appendtoks \stoptextcolorintent \to \everystoptextproperties
\setupcolors[\c!intent=\v!none]
% A goodie that replaces the startMPcolor hackery
% \definecolor[red-t] [r=1,t=0.5,a=1]
% \definecolor[green-t][g=1,t=0.5,a=1]
%
% \defineintermediatecolor[mycolora][0.5,red,green]
% \defineintermediatecolor[mycolorb][0.5,red-t,green-t]
%
% \definecolor[mycolorc][.5(blue,red)]
% \definecolor[mycolord][.5(blue)]
%
% \enabledirectives[colors.pgf]
% \definecolor[mycolorx][magenta!50!yellow]
%
% \starttext
% test {\mycolora OEPS} test
% test {\mycolorb OEPS} test
% test {\mycolorc OEPS} test
% test {\mycolord OEPS} test
% test {\mycolorx OEPS} test
% \stoptext
\unexpanded\def\defineintermediatecolor
{\dotripleempty\dodefineintermediatecolor}
\def\dodefineintermediatecolor[#1][#2][#3]% \dotripleempty adds {} inside []
{\dododefineintermediatecolor[#1][#2][#3]}
\def\dododefineintermediatecolor[#1][#2,#3,#4][#5]%
{\ifconditional\collectcolorsinlist\collectcolorinlist{#1}\fi
\ctxcommand{defineintermediatecolor("#1","#2",
\thecolorattribute{#3},\thecolorattribute{#4},
\thetransparencyattribute{#3},\thetransparencyattribute{#4},
"#5",false,\iffreezecolors true\else false\fi)}% not global
\dodefinecolorcommand\setvalue{#1}}
\protect \endinput
|
