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Diffstat (limited to 'tex/context/base/colo-ini.tex')
| -rw-r--r-- | tex/context/base/colo-ini.tex | 2992 |
1 files changed, 1496 insertions, 1496 deletions
diff --git a/tex/context/base/colo-ini.tex b/tex/context/base/colo-ini.tex index 1ba4603db..62723c3eb 100644 --- a/tex/context/base/colo-ini.tex +++ b/tex/context/base/colo-ini.tex @@ -1,1496 +1,1496 @@ -%D \module -%D [ file=colo-ini, -%D version=1997.4.1, -%D title=\CONTEXT\ Color Macros, -%D subtitle=Initialization, -%D author=Hans Hagen, -%D date=\currentdate, -%D copyright={PRAGMA / Hans Hagen \& Ton Otten}] -%C -%C This module is part of the \CONTEXT\ macro||package and is -%C therefore copyrighted by \PRAGMA. Non||commercial use is -%C granted. - -\writestatus{loading}{Context Color Macros} - -\unprotect - -%D Color support is not present in \TEX. Colorful output can -%D however be accomplished by using specials. This also means -%D that this support depends on the \DVI\ driver used. At the -%D moment this module was written, still no decent standard on -%D color specials has been agreed upon. We therefore decided to -%D implement a mechanism that is as independant as possible of -%D drivers. -%D -%D Color support shares with fonts that is must be implemented -%D in a way that permits processing of individual \DVI\ pages. -%D Furthermore it should honour grouping. The first condition -%D forces us to use a scheme that keeps track of colors at -%D page boundaries. This can be done by means of \TEX's -%D marking mechanism (\type{\mark}). -%D -%D When building pages, \TEX\ periodically looks at the -%D accumulated typeset contents and breaks the page when -%D suitable. At that moment, control is transfered to the -%D output routine. This routine takes care of building the -%D pagebody and for instance adds headers and footers. The page -%D can be broken in the middle of some colored text, but -%D headers and footers are often in black upon white or -%D background. If colors are applied there, they definitely -%D are used local, which means that they don't cross page -%D borders. -%D -%D Boxes are handled as a whole, which means that when we -%D apply colors inside a box, those colors don't cross page -%D boundaries, unless of course boxes are split or unboxed. -%D Especially in interactive texts, colors are often used in -%D such a local way: in boxes (buttons and navigational tools) -%D or in the pagebody (backgrounds). -%D -%D So we can distinguish local colors, that don't cross -%D pages from global colors, of which we can end many pages -%D later. The color macros will treat both types in a different -%D way, thus gaining some speed. -%D -%D This module also deals with gray scales. Because similar -%D colors can end up in the same gray scale when printed in -%D black and white, we also implement a palet system that deals -%D with these matters. Because of fundamental differences -%D between color and gray scale printing, in \CONTEXT\ we also -%D differ between these. For historic reasons |<|we first -%D implemented gray scales using patterns of tiny periods|>| -%D and therefore called them {\em rasters}. So don't be -%D surprised if this term shows up. - -\startmessages dutch library: colors - title: kleur - 1: systeem -- is globaal actief - 2: systeem -- is lokaal actief - 3: -- is niet gedefinieerd - 4: systeem -- wordt geladen - 5: onbekend systeem -- - 6: palet -- is beschikbaar - 7: palet -- is niet beschikbaar - 8: (verkeerde) specificatie -- bij -- wordt zwart - 9: -- kleurruimte wordt niet ondersteund - 10: -- kleurruimte wordt ondersteund - 11: kleur wordt vertaald in grijs -\stopmessages - -\startmessages english library: colors - title: color - 1: system -- is global activated - 2: system -- is local activated - 3: -- is not defined - 4: system -- is loaded - 5: unknown system -- - 6: palette -- is available - 7: palette -- is not available - 8: (invalid) specification -- at color -- becomes black - 9: -- color space is not supported - 10: -- color space is supported - 11: color is converted to gray -\stopmessages - -\startmessages german library: colors - title: farbe - 1: system -- ist global aktiviert - 2: system -- ist lokal aktiviert - 3: -- ist undefiniert - 4: system -- ist geladen - 5: unbekanntes System -- - 6: palette -- ist verfuegbar - 7: palette -- ist nicht verfuegbar - 8: (ungueltige) Spezifikation -- bei Farbe -- wird schwarz - 9: -- Farbraum wird nicht unterstuetzt - 10: -- Farbraum wird unterstuetzt - 11: Farbe wird in Grau umgewandelt -\stopmessages - -%D \macros -%D {definecolor} -%D {} -%D -%D We will enable users to specify colors in \kap{RGB} and -%D \kap{CMYK} color spaces or gray scales using -%D -%D \showsetup{\y!definecolor} -%D -%D For example: -%D -%D \starttypen -%D \definecolor [SomeKindOfRed] [r=.8,g=.05,b=.05] -%D \stoptypen -%D -%D Such color specifications are saved in a macro in the -%D following way: -%D -%D \starttypen -%D \setvalue{\??cr name}{R:r:g:b} -%D \setvalue{\??cr name}{C:c:m:y:k} -%D \setvalue{\??cr name}{S:s} -%D \stoptypen -%D -%D Gray scales are specified with the \type{s} parameter, -%D where the is derived from screen. - -\def\colorlist{} - -\def\@@cl@@z{0} -\def\@@cl@@o{1} - -\def\definecolor% - {\dodoubleargument\dodefinecolor} - -\def\dodefinecolor[#1][#2]% - {% beware -\saveglobal - \addtocommalist{#1}\colorlist -\restoreglobal - \doifassignmentelse{#2} - {\let\@@cl@@r=\@@cl@@z\let\@@cl@@g=\@@cl@@z\let\@@cl@@b=\@@cl@@z - \let\@@cl@@c=\@@cl@@z\let\@@cl@@m=\@@cl@@z\let\@@cl@@y=\@@cl@@z - \let\@@cl@@k=\@@cl@@z\let\@@cl@@s=\@@cl@@z - \getparameters[\??cl @@][#2]% - \doifelse{\@@cl@@r\@@cl@@g\@@cl@@b}{\@@cl@@z\@@cl@@z\@@cl@@z} - {\doifelse{\@@cl@@c\@@cl@@m\@@cl@@y\@@cl@@k}{\@@cl@@z\@@cl@@z\@@cl@@z\@@cl@@z} - {\doifelse{\@@cl@@s}{\@@cl@@z} - {\showmessage{\m!colors}{8}{{[#2]},#1}% - \redoglobal\setevalue{\??cr#1}{S:\@@cl@@z}} - {\redoglobal\setevalue{\??cr#1}{S:\@@cl@@s}}} - {\redoglobal\setevalue{\??cr#1}{C:\@@cl@@c:\@@cl@@m:\@@cl@@y:\@@cl@@k}}} - {\redoglobal\setevalue{\??cr#1}{R:\@@cl@@r:\@@cl@@g:\@@cl@@b}}} - {\doifdefinedelse{\??cr#2} - {\redoglobal\setevalue{\??cr#1}{\getvalue{\??cr#2}}} - {\showmessage{\m!colors}{3}{#1}}}% - \dodoglobal\setvalue{#1}{\color[#1]}} - -%D The names of colors are stored in a comma separated list -%D only for the purpose of showing them with \type{\showcolor}. -%D -%D Colors can be defined global by using \type{\doglobal}, -%D like in -%D -%D \startbuffer -%D \doglobal\definecolor [SomeKindOfRed] [r=.8,g=.05,b=.05] -%D \stopbuffer -%D -%D \typebuffer -%D -%D \haalbuffer -%D -%D This color shows up as \color[SomeKindOfRed]{some kind -%D of red}. - -%D \macros -%D {setupcolor} -%D {} -%D -%D Color definitions can be grouped in files with the name: -%D -%D \starttypen -%D \f!colorprefix-identifier.tex -%D \stoptypen -%D -%D where \type{\f!colorprefix} is \unprotect {\tttf \f!colorprefix}. -%D Loading such a file is done by \protect -%D -%D \showsetup{\y!setupcolor} -%D -%D Some default colors are specified in \type{colo-rgb.tex}, -%D which is loaded into the format by: -%D -%D \starttypen -%D \setupcolor[rgb] -%D \stoptypen - -\def\colorstyle{} - -\def\setupcolor% - {\dosingleargument\dosetupcolor} - -\def\dosetupcolor[#1]% - {\doifnot{#1}{\colorstyle} - {\def\colorstyle{#1}% - \def\dodosetupcolor##1% - {\makeshortfilename[\f!colorprefix\truefilename{##1}]% - \readsysfile{\shortfilename}% - {\showmessage{\m!colors}{4}{\colorstyle}} - {\showmessage{\m!colors}{5}{\colorstyle}}}% - \processcommalist[#1]\dodosetupcolor}} - -%D When typesetting for paper, we prefer using the \kap{CMYK} -%D color space, but for on||screen viewing we prefer \kap{RGB} -%D (the previous implementation supported only this scheme). -%D Independant of such specifications, we support some automatic -%D conversions: -%D -%D \startopsomming[opelkaar] -%D \som convert all colors to \kap{RGB} -%D \som convert all colors to \kap{CMYK} -%D \som convert all colors to gray scales -%D \stopopsomming -%D -%D We also support optimization of colors to gray scales. -%D -%D \startopsomming[verder] -%D \som reduce gray colors to gray scales -%D \som reduce \kap{CMY} components to \kap{K} -%D \stopopsomming -%D -%D These options are communicated by means of: - -\newif\ifRGBsupported -\newif\ifCMYKsupported -\newif\ifconverttoGRAY -\newif\ifpreferGRAY -\newif\ifGRAYprefered -\newif\ifreduceCMYK - -%D The last boolean controls reduction of \kap{CMYK} to -%D \kap{CMY} colors. When set to true, the black component -%D is added to the other ones. - -%D Color modes are entered using the next set of commands. -%D The \type{\stop} alternatives are implemented in a way -%D that permits non||grouped use. - -\def\dostartcolormodeR#1:#2:#3\od% - {\bgroup - \def\@@cl@@r{#1}\def\@@cl@@g{#2}\def\@@cl@@b{#3}% - \ifpreferGRAY\ifx\@@cl@@r\@@cr@@g\ifx\@@cl@@r\@@cl@@b - \GRAYpreferedtrue - \fi\fi\fi - \ifGRAYprefered - \dostartgraycolormode\@@cl@@r - \else\ifRGBsupported - \dostartrgbcolormode\@@cl@@r\@@cl@@g\@@cl@@b - \else\ifCMYKsupported - \convertRGBtoCMYK\@@cl@@r\@@cl@@g\@@cl@@b - \dostartcmykcolormode\@@cl@@c\@@cl@@m\@@cl@@y\@@cl@@k - \else - \convertRGBtoGRAY\@@cl@@r\@@cl@@g\@@cl@@b - \dostartgraycolormode\@@cl@@s - \fi\fi\fi - \egroup} - -\def\dostartcolormodeC#1:#2:#3:#4\od% - {\bgroup - \def\@@cl@@c{#1}\def\@@cl@@m{#2}\def\@@cl@@y{#3}\def\@@cl@@k{#4}% - \ifpreferGRAY\ifx\@@cl@@k\@@cl@@z\ifx\@@cl@@c\@@cr@@m\ifx\@@cl@@c\@@cl@@y - \GRAYpreferedtrue - \fi\fi\fi\fi - \ifGRAYprefered - \dostartgraycolormode\@@cl@@c - \else\ifCMYKsupported - \ifreduceCMYK - \convertCMYKtoCMY\@@cl@@c\@@cl@@m\@@cl@@y\@@cl@@k - \dostartcmykcolormode\@@cl@@c\@@cl@@m\@@cl@@y\@@cl@@k - \else - \dostartcmykcolormode\@@cl@@c\@@cl@@m\@@cl@@y\@@cl@@k - \fi - \else\ifRGBsupported - \convertCMYKtoRGB\@@cl@@c\@@cl@@m\@@cl@@y\@@cl@@k - \dostartrgbcolormode\@@cl@@r\@@cl@@g\@@cl@@b - \else - \convertCMYKtoGRAY\@@cl@@c\@@cl@@m\@@cl@@y\@@cl@@k - \dostartgraycolormode\@@cl@@s - \fi\fi\fi - \egroup} - -\def\dostartcolormodeS#1\od% - {\dostartgraycolormode{#1}} - -%D Prefering gray is not the same as converting to gray. Conversion treats -%D each color components in a different way, while prefering is just a -%D reduction and thus a space||saving option. - -%D \macros -%D {startcolormode,stopcolormode} -%D -%D We use \type{\stopcolormode} to reset the color in -%D whatever color space and do so by calling the corresponding -%D special. Both commands can be used for fast color -%D switching, like in colored verbatim, - -\def\dostartcolormode#1:% - {\getvalue{dostartcolormode#1}} - -\def\startcolormode#1% - {\doifcolorelse{#1} - {\getcurrentcolorspecs{#1}% - \expandafter\dostartcolormode\currentcolorspecs\od} - {\dostopcolormode}} - -\def\stopcolormode% - {\dostopcolormode} - -%D We use some reserved names for local color components. -%D Consistent use of these scratch variables saves us -%D unneccessary hash entries. -%D -%D \starttypen -%D \@@cl@@r \@@cl@@g \@@cl@@b -%D \@@cl@@c \@@cl@@m \@@cl@@y \@@cl@@k -%D \@@cl@@s -%D \stoptypen -%D -%D We implement several conversion routines. -%D -%D \starttypen -%D \convertRGBtoCMYK {r} {g} {b} -%D \convertRGBtoGRAY {r} {g} {b} -%D \convertCMYKtoRGB {c} {m} {y} {k} -%D \convertCMYKtoGRAY {c} {m} {y} {k} -%D \convertCMYKtoCMY {c} {m} {y} {k} -%D \stoptypen -%D -%D The relation between \kap{Gray}, \kap{RGB} and \kap{CMYK} -%D is: -%D -%D \plaatsformule[-] -%D \startformule -%D G = .30r + .59g + .11b -%D = 1.0 - \min(1.0,\ .30c + .59m + .11y + k) -%D \stopformule -%D -%D When converting from \kap{CMYK} to \kap{RGB} we use the -%D formula: -%D -%D \plaatsformule[-] -%D \startformule -%D \eqalign -%D {r &= 1.0 - \min(1.0,\ c+k) \cr -%D g &= 1.0 - \min(1.0,\ m+k) \cr -%D b &= 1.0 - \min(1.0,\ y+k)} -%D \stopformule -%D -%D In the conversion routine the color components are calculated -%D in three digits precision. - -\def\realcolorvalue#1% - {\ifnum #1<10 0.00\the#1% - \else\ifnum#1<100 0.0\the#1% - \else\ifnum#1<1000 0.\the#1% - \else 1\fi\fi\fi} - -\def\doconvertCMYKtoRGB#1\k#2\to#3% - {\scratchdimen=#1\s!pt - \advance\scratchdimen by #2\s!pt\relax - \ifdim\scratchdimen>1\s!pt - \scratchdimen=-1\s!pt - \else - \scratchdimen=-\scratchdimen - \fi - \advance\scratchdimen by 1\s!pt - \multiply\scratchdimen by 1000 - \scratchcounter=\scratchdimen - \advance\scratchcounter by \!!medcard - \divide\scratchcounter by \!!maxcard - \edef#3{\realcolorvalue\scratchcounter}} - -\def\convertCMYKtoRGB#1#2#3#4% - {\doconvertCMYKtoRGB#1\k#4\to\@@cl@@r - \doconvertCMYKtoRGB#2\k#4\to\@@cl@@g - \doconvertCMYKtoRGB#3\k#4\to\@@cl@@b} - -\def\doconvertRGBtoCMYK#1\to#2% - {\scratchdimen=#1\s!pt - \multiply\scratchdimen by 1000 - \scratchcounter=\scratchdimen - \advance\scratchcounter by \!!medcard - \divide\scratchcounter by \!!maxcard - \scratchcounter=-\scratchcounter - \advance\scratchcounter by 1000 - \edef#2{\realcolorvalue\scratchcounter}} - -\def\convertRGBtoCMYK#1#2#3% - {\doconvertRGBtoCMYK#1\to\@@cl@@c - \doconvertRGBtoCMYK#2\to\@@cl@@m - \doconvertRGBtoCMYK#3\to\@@cl@@y - \let\@@cl@@k=\@@cl@@z} - -\def\convertRGBtoGRAY#1#2#3% - {\scratchdimen=#1\s!pt - \scratchdimen=300\scratchdimen - \scratchcounter=\scratchdimen - \scratchdimen=#2\s!pt - \scratchdimen=590\scratchdimen - \advance\scratchcounter by \scratchdimen - \scratchdimen=#3\s!pt - \scratchdimen=110\scratchdimen - \advance\scratchcounter by \scratchdimen - \advance\scratchcounter by \!!medcard - \divide\scratchcounter by \!!maxcard - \edef\@@cl@@s{\realcolorvalue\scratchcounter}} - -\def\convertCMYKtoGRAY#1#2#3#4% - {\convertCMYKtoRGB{#1}{#2}{#3}{#4}% - \convertRGBtoGRAY\@@cl@@r\@@cl@@g\@@cl@@b} - -\def\doconvertCMYKtoCMY#1\k#2\to#3% - {\scratchdimen=#1\s!pt - \advance\scratchdimen by #2\s!pt\relax - \ifdim\scratchdimen>1\s!pt - \scratchdimen=1\s!pt - \else - \scratchdimen=\scratchdimen - \fi - \multiply\scratchdimen by 1000 - \scratchcounter=\scratchdimen - \advance\scratchcounter by \!!medcard - \divide\scratchcounter by \!!maxcard - \edef#3{\realcolorvalue\scratchcounter}} - -\def\convertCMYKtoCMY#1#2#3#4% - {\doconvertCMYKtoCMY#1\k#4\to\@@cl@@c - \doconvertCMYKtoCMY#2\k#4\to\@@cl@@m - \doconvertCMYKtoCMY#3\k#4\to\@@cl@@y - \let\@@cl@@k=\@@cl@@z} - -%D We already mentioned that colors interfere with building -%D the pagebody. This means that when the page is composed, -%D the colors temporary have to be reset. After the page is -%D shipped out, we have to revive the current color. -%D -%D We use \type{\marks} to keep track of colors across page -%D boundaries. Unfortunately standard \TEX\ supports only one mark, -%D and using this one for color support only would be a waste. -%D We therefore use an adapted version of J.~Fox's multiple mark -%D mechanism as (re|)|implemented in \module{supp-mrk}. - -\doifdefinedelse{newmark} - {\newmark\colormark} - {\def\colormark#1{}} - -%D Using this mark mechanism with lots of colors has one -%D major drawback: \TEX's memory tends to overflow when -%D very colorful text is stored in a global box. Even worse is that -%D the processing time grows considerably. We therefore support -%D local as well as global color switching. -%D -%D Of the next macros, \type{\popcolor} is to be used after -%D the actual \type{\shipout} and \type{\startcolorpage} and -%D \type{\stopcolorpage} are called when entering and leaving -%D the \type{\pagebody} builder. In case of emergencies -%D \type{\pushcolor} can be used to undo the current color, -%D for instance when insertions are appended to the page. - -%D Before we present the color macros, we first define the -%D setup command. This command takes care of setting up the -%D booleans that control local and global behavior and -%D conversion to other color spaces. - -\newif\ifincolor -\newif\iflocalcolor - -\def\setupcolors% - {\dosingleargument\dosetupcolors} - -\def\dosetupcolors[#1]% - {\getparameters[\??cl][#1]% - \doifelse{\@@clreductie}{\v!ja} - {\reduceCMYKtrue} - {\reduceCMYKfalse}% - \doifelse{\@@clrgb}{\v!nee} - {\showmessage{\m!colors}{9}{\v!rgb}\RGBsupportedfalse} - {\showmessage{\m!colors}{10}{\v!rgb}\RGBsupportedtrue}% - \doifelse{\@@clcmyk}{\v!nee} - {\showmessage{\m!colors}{9}{\v!cmyk}\CMYKsupportedfalse} - {\showmessage{\m!colors}{10}{\v!cmyk}\CMYKsupportedtrue}% - \processaction - [\@@clconversie] - [ \v!ja=>\preferGRAYtrue, - \v!nee=>\preferGRAYfalse, - \v!altijd=>\preferGRAYtrue - \RGBsupportedfalse - \CMYKsupportedfalse, - \s!default=>\preferGRAYfalse, - \s!unknown=>\preferGRAYfalse]% - \ifRGBsupported - \converttoGRAYfalse - \forcegrayMPcolorsfalse - \else\ifCMYKsupported - \converttoGRAYfalse - \forcegrayMPcolorsfalse - \convertMPcolorstrue - \ifreduceCMYK - \reduceMPcolorstrue - \fi - \else - \converttoGRAYtrue - \forcegrayMPcolorstrue - \convertMPcolorsfalse - \reduceMPcolorsfalse - \showmessage{\m!colors}{11}{}% - \fi\fi - \processaction - [\@@clstatus] - [\v!globaal=>\incolortrue\localcolorfalse - \showmessage{\m!colors}{1}{\colorstyle}, - \v!lokaal=>\incolortrue\localcolortrue - \showmessage{\m!colors}{2}{\colorstyle}, - \v!start=>\let\@@clstatus=\v!globaal - \incolortrue\localcolorfalse - \showmessage{\m!colors}{1}{\colorstyle}, - \v!stop=>\incolorfalse\localcolorfalse - \forcegrayMPcolorstrue]} - -%D \macros -%D {doifcolorelse} -%D {} -%D -%D Switching to a color is done by means of the following -%D command. Later on we will explain the use of palets. We -%D define ourselves a color conditional first. - -\def\currentpalet{} - -\def\doifcolorelse#1% - {\doifdefinedelse{\??cr\currentpalet#1}} - -\def\getcurrentcolorspecs#1% - {\edef\currentcolorspecs{\getvalue{\??cr\currentpalet#1}}} - -%D \macros -%D {localstartcolor,localstopcolor} -%D {} -%D -%D Simple color support, that is without nesting, is provided -%D by: - -\def\localstartcolor[#1]% - {\ifincolor - \localcolortrue - \doglobalstartcolor[#1]% - \fi} - -\def\localstopcolor% - {\ifincolor - \doglobalstopcolor - \fi} - -%D \macros -%D {startcolor,stopcolor} -%D {} -%D -%D The more save method, the one that saves the current color -%D state and returns to this state afterward, is activated by: -%D -%D \showsetup{\y!startcolor} - -\def\startcolor[#1]% - {\ifincolor - \doglobalstartcolor[#1]% - \fi} - -\def\stopcolor% - {\ifincolor - \doglobalstopcolor - \fi} - -%D This macros call the global color switching ones. Starting -%D a global, i.e. a possible page boundary crossing, color -%D mode also sets a \type{\mark} in \TEX's internal list. - -\newcount\colorlevel - -\setvalue{\??cl0C}{} % saved color -\setvalue{\??cl0S}{} % stop command - -\def\dodoglobalstartcolor[#1]% - {\xdef\currentcolor{\getvalue{\??cl\the\colorlevel C}}% - \global\advance\colorlevel by 1 - \setxvalue{\??cl\the\colorlevel C}{#1}% - \debuggerinfo{\m!colors} - {start #1 at level \the\colorlevel}% - \doifelsenothing{#1} - {\setxvalue{\??cl\the\colorlevel C}{\currentcolor}% - \setgvalue{\??cl\the\colorlevel S}{\donoglobalstopcolor}} - {\doifelse{#1}{\currentcolor} - {\setgvalue{\??cl\the\colorlevel S}{\donoglobalstopcolor}} - {\doifcolorelse{#1} - {\docolormark{#1}% - \setgvalue{\??cl\the\colorlevel S}{\dodoglobalstopcolor}% - \startcolormode{#1}} - {\setgvalue{\??cl\the\colorlevel S}{\donoglobalstopcolor}% - \showmessage{\m!colors}{3}{#1}}}}} - -\def\doglobalstartcolor[#1]% - {\ifnum\colorlevel=0 - \doifelsenothing{#1} - {\setgvalue{\??cl\the\colorlevel S}{}} - {\dodoglobalstartcolor[#1]}% - \else - \dodoglobalstartcolor[#1]% - \fi - \ignorespaces} - -\def\donoglobalstopcolor% - {\ifnum\colorlevel>0 - \xdef\currentcolor{\getvalue{\??cl\the\colorlevel C}}% - \debuggerinfo{\m!colors} - {stop \currentcolor\normalspace at level \the\colorlevel}% - \global\advance\colorlevel by -1 - \fi} - -\def\dodoglobalstopcolor% - {\ifnum\colorlevel>0 - \donoglobalstopcolor - \xdef\previouscolor{\getvalue{\??cl\the\colorlevel C}}% - \ifnum\colorlevel=0 - \docolormark{}% - \stopcolormode - \else % let's do a bit redundant testing here - \docolormark{\previouscolor}% - \doifelsenothing{\previouscolor} - {\dostopcolormode} - {\doifcolorelse{\previouscolor} - {\doifnot{\currentcolor}{\previouscolor} - {\startcolormode{\previouscolor}}} - {\dostopcolormode}}% - \fi - \fi} - -\def\doglobalstopcolor% - {\getvalue{\??cl\the\colorlevel S}} - -%D We don't use grouping and save each stop alternative. This -%D permits be especially useful in for instance local color -%D support in verbatim. Using \type{\bgroup}||\type{\egroup} -%D pairs could interfere with calling commands - -%D This color mechanism takes care of nested colors, like in: -%D -%D \startbuffer -%D \kleur[groen]{groen \kleur[groen]{groen \kleur[rood]{rood}} groen} -%D \kleur[groen]{groen \kleur[]{groen \kleur[rood]{rood}} groen} -%D \kleur[groen]{groen \kleur[rood]{rood \kleur[rood]{rood}} groen} -%D \kleur[groen]{groen \kleur[groen]{groen \kleur[]{groen}} groen} -%D \kleur[groen]{groen \kleur[rood]{rood} groen} -%D \kleur[groen]{groen \kleur[]{groen} groen} -%D \kleur[]{zwart \kleur[rood]{rood} zwart} -%D \kleur[]{zwart} -%D \stopbuffer -%D -%D \typebuffer -%D -%D or -%D -%D \startvoorbeeld -%D \startregels -%D \haalbuffer -%D \stopregels -%D \stopvoorbeeld -%D -%D Crossing page boundaries is of course also handled. -%D Undefined or empty color specifications are treated as -%D efficient as possible. -%D -%D \startbuffer -%D \startkleur[groen] -%D [groen] \input tufte [groen] \par -%D \startkleur[] -%D [groen] \input knuth [groen] \par -%D \startkleur[rood] -%D [rood] \input tufte [rood] \par -%D \startkleur[geel] -%D [geel] \input knuth [geel] \par -%D \stopkleur -%D [rood] \input tufte [rood] \par -%D \stopkleur -%D [groen] \input knuth [groen] \par -%D \stopkleur -%D [groen] \input tufte [groen] \par -%D \stopkleur -%D \stopbuffer -%D -%D \startvoorbeeld -%D \haalbuffer -%D \stopvoorbeeld -%D -%D These quotes are typeset by saying: -%D -%D \typebuffer -%D -%D Out of efficiency we only use marks when needed. The next -%D macro tries to find out if indeed a mark should be set. -%D This macro uses the boolean \type{\ifinpagebody}, which can -%D be defined and set in the module that handles the pagebody. - -\ifx\ifinpagebody\undefined \newif\ifinpagebodytrue \fi - -\def\docolormark#1% - {\ifinpagebody \else - \iflocalcolor \else - \dodocolormark{#1}% - \fi - \fi} - -\let\lastcolormark=\empty - -\def\dodocolormark#1% - {\doifnot{#1}{\lastcolormark} - {\colormark{#1}% - \xdef\lastcolormark{#1}}} - -%D \macros -%D {pushcolor, popcolor} -%D {} -%D -%D Pushing the current state in the output routine simply comes -%D to resetting the color to black, while popping restores the -%D color state to that of before the break. - -\def\pushcolor% - {\stopcolormode} - -\def\popcolor% - {\doifsomething{\botcolormark} - {\debuggerinfo{\m!colors}{popping \botcolormark}% - \startcolormode{\botcolormark}}} - -\def\popsplitcolor% - {\getsplitmarks\colormark % hier wel - \doifsomething{\botcolormark} - {\debuggerinfo{\m!colors}{split popping \botcolormark}% - \startcolormode{\botcolormark}}} - -%D \macros -%D {startcolorpage, stopcolorpage} -%D {} -%D -%D Local use can be forced with the next two macros. Nesting -%D is still supported but colors are no longer marked. - -%D \starttypen -%D \def\startcolorpage% -%D {\bgroup -%D \let\docolormark=\gobbleoneargument -%D \edef\savedcolorlevel{\the\colorlevel}% -%D \ifnum\colorlevel>0 -%D \stopcolormode -%D \fi -%D \global\colorlevel=0\relax} -%D -%D \def\stopcolorpage% -%D {\global\colorlevel=\savedcolorlevel\relax -%D \egroup} -%D \stoptypen - -%D The next alternative makes (simple) color separation more -%D easy: - -\def\startcolorpage% - {\bgroup - \let\docolormark=\gobbleoneargument - \edef\savedcolorlevel{\the\colorlevel}% - \localstartcolor[black]% - \global\colorlevel=0\relax} - -\def\stopcolorpage% - {\localstopcolor - \global\colorlevel=\savedcolorlevel\relax - \egroup} - -%D \macros -%D {color,gray} -%D {} -%D -%D This leaves the simple color command: -%D -%D \showsetup{\y!color} -%D \showsetup{\y!gray} -%D -%D Which can be used straightforward: \color[groen]{green as gras}. -%D We want color support to be similar to font support and -%D therefore implement \type{\color} as: - -\unexpanded\def\color[#1]% - {\groupedcommand - {\startcolor[#1]} - {\stopcolor}} - -\unexpanded\def\gray[#1]% - {\groupedcommand - {\RGBsupportedfalse\CMYKsupportedfalse\startcolor[#1]} - {\stopcolor}} - -%D This implementation enables use of defined colors like: -%D -%D \starttypen -%D Look at the {\brightgreen bright} side of life and get -%D yourself no \red{red} head! -%D \stoptypen - -%D \macros -%D {colorvalue, grayvalue} -%D {} -%D -%D We can typeset the color components using \type{\colorvalue} and -%D \type{\grayvalue}. The commands: -%D -%D \startbuffer -%D color value of SomeKindOfRed: \colorvalue{SomeKindOfRed} \crlf -%D gray value of SomeKindOfRed: \grayvalue{SomeKindOfRed} -%D \stopbuffer -%D -%D \typebuffer -%D -%D show us: -%D -%D \startvoorbeeld -%D \haalbuffer -%D \stopvoorbeeld - -\def\realcolorformat#1% - {\ifnum#1<10 0.00\the#1% - \else\ifnum#1<100 0.0\the#1% - \else\ifnum#1<1000 0.\the#1% - \else 1.000\fi\fi\fi} - -\def\colorformatseparator{ } - -\def\dodoformatcolor#1% - {\scratchdimen=#1\s!pt\relax - \ifdim\scratchdimen>1\s!pt - \scratchdimen=1\s!pt - \fi - \multiply\scratchdimen by 1000 - \scratchcounter=\scratchdimen - \advance\scratchcounter by \!!medcard - \divide\scratchcounter by \!!maxcard \relax - \realcolorformat\scratchcounter} - -\def\doformatcolorR#1:#2:#3\od% - {\dodoformatcolor{#1}\colorformatseparator - \dodoformatcolor{#2}\colorformatseparator - \dodoformatcolor{#3}} - -\def\doformatcolorC#1:#2:#3:#4\od% - {\dodoformatcolor{#1}\colorformatseparator - \dodoformatcolor{#2}\colorformatseparator - \dodoformatcolor{#3}\colorformatseparator - \dodoformatcolor{#4}} - -\def\doformatcolorS#1\od% - {\dodoformatcolor{#1}} - -\def\doformatcolor#1:% - {\getvalue{doformatcolor#1}} - -\def\colorvalue#1% - {\doifcolorelse{#1} - {\getcurrentcolorspecs{#1}% - \expandafter\doformatcolor\currentcolorspecs\od} - {}} - -\def\doformatgrayR#1:#2:#3\od% - {\convertRGBtoGRAY{#1}{#2}{#3}% - \dodoformatcolor\@@cl@@s} - -\def\doformatgrayC#1:#2:#3:#4\od% - {\convertCMYKtoGRAY{#1}{#2}{#3}{#4}% - \dodoformatcolor\@@cl@@s} - -\def\doformatgrayS#1\od% - {\dodoformatcolor{#1}} - -\def\doformatgray#1:% - {\getvalue{doformatgray#1}} - -\def\grayvalue#1% - {\doifcolorelse{#1} - {\getcurrentcolorspecs{#1}% - \expandafter\doformatgray\currentcolorspecs\od} - {}} - -%D \macros -%D {locatstartraster,localstopraster, -%D startraster,stopraster} -%D {} -%D -%D The previous conversions are not linear and treat each color -%D component according to human perception curves. Pure gray -%D (we call them rasters) has equal color components. In -%D \CONTEXT\ rasters are only used as backgrounds and these -%D don't cross page boundaries in the way color does. Therefore -%D we don't need stacks and marks. Just to be compatible with -%D color support we offer both 'global' and 'local' commands. - -\def\localstartraster[#1]% - {\doifinstringelse{.}{#1} - {\dostartgraymode{#1}} - {\dostartgraymode{\@@rsraster}}} - -\def\localstopraster% - {\dostopgraymode} - -\def\startraster% - {\localstartraster} - -\def\stopraster% - {\localstopraster} - -%D In this documentation we will not go into too much details -%D on palets. Curious users can find more information on this -%D topic in \uit[use of color]. -%D -%D At the moment we implemented color in \CONTEXT\ color -%D printing was not yet on the desktop. In spite of this lack our -%D graphics designer made colorfull illustrations. When printed -%D on a black and white printer, distinctive colors can come -%D out equally gray. We therefore decided to use only colors -%D that were distinctive in colors as well as in black and -%D white print. -%D -%D Although none of the graphic packages we used supported -%D logical colors and global color redefition, we build this -%D support into \CONTEXT. This enabled us to experiment and -%D also prepared us for the future. - -%D \macros -%D {definepalet} -%D {} -%D -%D Colors are grouped in palets. The colors in such a palet can -%D have colorful names, but best is to use names that specify -%D their use, like {\em important} or {\em danger}. As a sort -%D of example \CONTEXT\ has some palets predefined, -%D like:\voetnoot{At the time I wrote the palet support, I was -%D reading 'A hort history of time' of S.~Hawkins, so that's -%D why we stuck to quarks.} -%D -%D \starttypen -%D \definepalet -%D [alfa] -%D [ top=rood:7, -%D bottom=groen:6, -%D up=blauw:5, -%D down=cyaan:4, -%D strange=magenta:3, -%D charm=geel:2] -%D \stoptypen -%D -%D It's formal definition is: -%D -%D \showsetup{\y!definepalet} -%D -%D Visualized, such a palet looks like: -%D -%D \startbuffer[palet] -%D \showpalet [alfa] [horizontaal,naam,nummer,waarde] -%D \stopbuffer -%D -%D \startregelcorrectie -%D \haalbuffer[palet] -%D \stopregelcorrectie -%D -%D This bar shows both the color and gray alternatives of the -%D palet components (not visible in black and white print). -%D -%D When needed, one can copy a palet by saying: -%D -%D \starttypen -%D \definepalet [TEXcolorpretty] [colorpretty] -%D \stoptypen -%D -%D This saves us some typing in for instance the modules that -%D deal with pretty verbatim typesetting. - -\def\definepalet% - {\dodoubleargument\dodefinepalet} - -\def\dodefinepalet[#1][#2]% - {\doifassignmentelse{#2} - {\setvalue{\??pa#1}{}% - \setevalue{\??pa\??pa#1}{#2}% - \showmessage{\m!colors}{6}{#1}% - \def\dodododefinepalet[##1=##2]% - {\doifvaluesomething{\??pa#1} - {\setevalue{\??pa#1}{\getvalue{\??pa#1},}}% - \setevalue{\??pa#1}{\getvalue{\??pa#1}##1}% - \doifdefinedelse{\??cr##2} - {\setevalue{\??cr#1:##1}{\getvalue{\??cr##2}}} - {\setevalue{\??cr#1:##1}{S:0}}}% - \def\dododefinepalet##1% - {\dodododefinepalet[##1]}% - \processcommalist[#2]\dododefinepalet} - {\doifdefined{\??pa#2} - {\expanded{\dodefinepalet[#1][\getvalue{\??pa\??pa#2}]}}}} - -%D \macros -%D {setuppalet} -%D {} -%D -%D Colors are taken from the current palet, if defined. -%D Setting the current palet is done by: -%D -%D \showsetup{\y!setuppalet} - -\def\currentpalet{} - -\def\setuppalet% - {\dosingleempty\dosetuppalet} - -\def\dosetuppalet[#1]% - {\doifelsenothing{#1} - {\def\currentpalet{}} - {\doifelsevaluenothing{\??pa#1} - {\showmessage{\m!colors}{7}{#1}% - \def\currentpalet{}} - {\def\currentpalet{#1:}}}} - -%D \macros -%D {showpalet} -%D {} -%D -%D The previous visualization was typeset with: -%D -%D \typebuffer[palet] -%D -%D This commands is defined as: -%D -%D \showsetup{\y!showpalet} - -\def\showpalet% - {\dodoubleargument\doshowpalet} - -\def\doshowpalet[#1][#2]% - {\doifdefined{\??pa#1} - {\doifinsetelse{\v!vertikaal}{#2} - {\showverticalpalet[#1][#2]} - {\showhorizontalpalet[#1][#2]}}} - -\def\showverticalpalet[#1][#2]% - {\localvbox - {\offinterlineskip - \setuppalet[#1] - \def\rule% - {\vrule\!!width3em\!!height\ht\strutbox\!!depth\dp\strutbox} - \tabskip\!!zeropoint - \def\doshowpalet##1% - {\doifinsetelse{\v!nummer}{#2}{##1\hskip.5em}{}& - \color[##1]{\rule}\gray[##1]{\rule}& - \doifinset{\v!waarde}{#2}{\hskip.5em\colorvalue{##1}}\crcr} - \halign - {\hss##&\hss##\hss&##\cr - &\doifinset{\v!naam}{#2}{\strut#1}&\cr% - \processpalet[#1]\doshowpalet\crcr}}} - -\def\showhorizontalpalet[#1][#2]% - {\localvbox - {\offinterlineskip - \setuppalet[#1] - \tabskip\!!zeropoint - \!!widtha=\!!zeropoint - \doifinset{\v!nummer}{#2} - {\def\doshowpalet##1% - {\setbox0=\hbox{##1}% - \ifdim\!!widtha<\wd0\!!widtha=\wd0\fi}% - \processpalet[#1]\doshowpalet}% - \advance\!!widtha by 1em - \ifdim\!!widtha<5em - \!!widtha=5em - \fi - \halign - {##&&\hbox to \!!widtha{\hss##\hss}\cr - \doifinset{\v!nummer}{#2} - {\def\doshowpalet##1{&\strut##1}% - \processpalet[#1]\doshowpalet}\cr - \doifinset{\v!naam}{#2}{#1\hskip.5em}% - \def\doshowpalet##1% - {&\color[##1]{\vrule\!!width\!!widtha\!!height\ht\strutbox\!!depth\!!zeropoint}}% - \processpalet[#1]\doshowpalet\crcr - \def\doshowpalet##1% - {&\gray[##1]{\vrule\!!width\!!widtha\!!height\!!zeropoint\!!depth\dp\strutbox}}% - \processpalet[#1]\doshowpalet\crcr - \doifinset{\v!waarde}{#2} - {\def\doshowpalet##1% - {&\vbox - {\hsize\!!widtha - \vskip.25ex - \everypar{\strut} - \veryraggedcenter - \let\colorformatseparator=\endgraf - \colorvalue{##1}}}% - \processpalet[#1]\doshowpalet}% - \crcr}}} - -\def\processpalet[#1]% - {\expanded{\globalprocesscommalist[\getvalue{\??pa#1}]}} - -%D \macros -%D {definecolorgroup} -%D {} -%D -%D The naming of the colors in this palet suggests some -%D ordening, which in turn is suported by color grouping. -%D -%D \starttypen -%D \definecolorgroup -%D [rood] -%D [1.00:0.90:0.90, -%D 1.00:0.80:0.80, -%D 1.00:0.70:0.70, -%D 1.00:0.55:0.55, -%D 1.00:0.40:0.40, -%D 1.00:0.25:0.25, -%D 1.00:0.15:0.15, -%D 0.90:0.00:0.00] -%D \stoptypen -%D -%D In such a color group colors are numbered from~$1$ to~$n$. -%D -%D \showsetup{\y!definecolorgroup} -%D -%D This kind of specification is not only more compact than -%D defining each color separate, it also loads faster and takes -%D less bytes. - -\def\definecolorgroup% - {\dotripleempty\dodefinecolorgroup} - -\def\dodefinecolorgroup[#1][#2][#3]% - {\ifthirdargument - \processaction - [#2] - [ \v!cmyk=>\edef\currentcolorspace{C}, - \v!rgb=>\edef\currentcolorspace{R}, - \v!gray=>\edef\currentcolorspace{S}, - \s!unknown=>\edef\currentcolorspace{R}]% - \scratchcounter=0 - \def\dododefinecolorgroup##1% - {\advance\scratchcounter by 1 - \setevalue{\??cr#1:\the\scratchcounter}{\currentcolorspace:##1}}% - \processcommalist[#3]\dododefinecolorgroup - \else - \doifinstringelse{:}{#2} - {\definecolorgroup[#1][\v!rgb][#2]} - {\doloop - {\doifdefinedelse{\??cr#2:\recurselevel} - {\setevalue{\??cr#1:\recurselevel}% - {\getvalue{\??cr#2:\recurselevel}}} - {\exitloop}}}% - \fi} - -%D \macros -%D {showcolorgroup} -%D {} -%D -%D We can show the group by: -%D -%D \startbuffer -%D \showcolorgroup [blauw] [horizontaal,naam,nummer,waarde] -%D \stopbuffer -%D -%D \typebuffer -%D -%D or in color: -%D -%D \startregelcorrectie -%D \haalbuffer -%D \stopregelcorrectie -%D -%D which uses: -%D -%D \showsetup{\y!showcolorgroup} - -\def\showcolorgroup% - {\dodoubleargument\doshowcolorgroup} - -\def\doshowcolorgroup[#1][#2]% - {\doifdefined{\??cr#1:1} - {\doifinsetelse{\v!vertikaal}{#2} - {\showverticalcolorgroup[#1][#2]} - {\showhorizontalcolorgroup[#1][#2]}}} - -\def\showhorizontalcolorgroup[#1][#2]% - {\localvbox - {\offinterlineskip - \setuppalet - \tabskip\!!zeropoint - \def\rule% - {\vrule\!!width4em\!!height\ht\strutbox\!!depth\dp\strutbox} - \def\colorformatseparator{\strut\cr} - \def\dodoshowgroup##1% - {\halign - {\hss####\hss\cr - \doifinset{\v!nummer}{#2}{\strut##1}\cr - \color[#1:##1]{\vrule\!!width4em\!!height\ht\strutbox\!!depth\!!zeropoint}\cr - \gray[#1:##1]{\vrule\!!width4em\!!height\!!zeropoint\!!depth\dp\strutbox}\cr - \doifinset{\v!waarde}{#2}{\colorvalue{#1:##1}\strut}\crcr}} - \def\doshowgroup##1% - {\doifdefined{\??cr#1:##1} - {\vbox{\dodoshowgroup{##1}}}} - \hbox - {\doifinset{\v!naam}{#2} - {\strut - \doifinsetelse{\v!waarde}{#2} - {\raise3\lineheight\hbox{#1\hskip.5em}} - {#1}% - \hskip.5em}% - \doshowgroup1\doshowgroup2\doshowgroup3\doshowgroup4% - \doshowgroup5\doshowgroup6\doshowgroup7\doshowgroup8}}} - -\def\showverticalcolorgroup[#1][#2]% - {\localvbox - {\offinterlineskip - \setuppalet - \tabskip\!!zeropoint - \def\rule% - {\vrule\!!width2.5em\!!height\ht\strutbox\!!depth\dp\strutbox} - \def\doshowgroup##1% - {\doifdefined{\??cr#1:##1} - {\doifinset{\v!nummer}{#2}{##1\hskip.5em}& - \color[#1:##1]{\rule}\gray[#1:##1]{\rule}& - \doifinset{\v!waarde}{#2}{\hskip.5em\colorvalue{#1:##1}}\crcr}} - \halign - {\hss##&\hss##\hss&##\hss\cr - &\doifinset{\v!naam}{#2}{\strut#1}&\crcr - \doshowgroup1\doshowgroup2\doshowgroup3\doshowgroup4% - \doshowgroup5\doshowgroup6\doshowgroup7\doshowgroup8}}} - -%D There are ten predefined color groups, like -%D \color[groen]{\em groen}, \color[rood]{\em rood}, -%D \color[blauw]{\em blauw}, \color[cyaan]{\em cyaan}, -%D \color[magenta]{\em magenta} and \color[geel]{\em geel}. -%D -%D \startregelcorrectie -%D \hbox to \hsize -%D {\hss -%D \showcolorgroup [rood] [vertikaal,naam,nummer]\hss -%D \showcolorgroup [groen] [vertikaal,naam]\hss -%D \showcolorgroup [blauw] [vertikaal,naam]\hss -%D \showcolorgroup [cyaan] [vertikaal,naam]\hss -%D \showcolorgroup [magenta] [vertikaal,naam]\hss -%D \showcolorgroup [geel] [vertikaal,naam]\hss} -%D \stopregelcorrectie -%D -%D These groups are used to define palets {\em alfa} upto {\em -%D zeta}. As long as we don't use colors from the same row, we -%D get ourselves distinctive palets. By activating such a palet -%D one gains access to its members {\em top} to {\em charm} (of -%D course one should use more suitable names than these). -%D -%D \startregelcorrectie -%D \hbox to \hsize -%D {\showpalet [alfa] [vertikaal,naam,nummer]\hss -%D \showpalet [beta] [vertikaal,naam]\hss -%D \showpalet [gamma] [vertikaal,naam]\hss -%D \showpalet [delta] [vertikaal,naam]\hss -%D \showpalet [epsilon] [vertikaal,naam]\hss -%D \showpalet [zeta] [vertikaal,naam]} -%D \stopregelcorrectie -%D -%D By using the keyword \type{\v!waarde} the individual color -%D components are shown too. When printed in color, these -%D showcases show both the colors and the gray value. - -%D \macros -%D {comparepalet} -%D {} -%D -%D There are some more testing macros available: -%D -%D \startbuffer -%D \comparepalet [alfa] -%D \stopbuffer -%D -%D \typebuffer -%D -%D shows the palet colors against a background: -%D -%D \startregelcorrectie -%D \haalbuffer -%D \stopregelcorrectie -%D -%D The formal definition is: -%D -%D \showsetup{\y!comparepalet} - -\def\comparepalet% - {\dosingleargument\docomparepalet} - -\def\docomparepalet[#1]% - {\doifdefined{\??pa#1} - {\hbox - {\dodocomparepalet\color[#1]% - \quad - \dodocomparepalet\gray[#1]}}} - -\def\dodocomparepalet#1[#2]% - {\localvbox - {\offinterlineskip - \setuppalet[#2] - \getcommacommandsize[\getvalue{\??pa#2}] - \!!widtha=2em\relax - \hsize=\commalistsize\!!widtha - \def\rule% - {\vrule\!!width.5\!!widtha\!!height2.25ex\!!depth-.75ex} - \def\dododocomparepalet##1% - {\hbox - {\setbox0=\hbox - {#1[##1]{\vrule\!!width\hsize\!!height3ex}}% - \wd0=\!!zeropoint\box0 - \hbox to \hsize - {\def\dododocomparepalet####1% - {\hbox to \!!widtha - {\hss#1[####1]{\rule}\hss}}% - \processcommacommand[\getvalue{\??pa#2}]\dododocomparepalet}} - \endgraf} - \processcommacommand[\getvalue{\??pa#2}]\dododocomparepalet}} - -%D \macros -%D {comparecolorgroup} -%D {} -%D -%D The similar command: -%D -%D \startbuffer -%D \comparecolorgroup [blauw] -%D \stopbuffer -%D -%D \typebuffer -%D -%D shows color groups: -%D -%D \startregelcorrectie -%D \haalbuffer -%D \stopregelcorrectie -%D -%D this commands are defined as: -%D -%D \showsetup{\y!comparecolorgroup} - -\def\comparecolorgroup% - {\dosingleargument\docomparecolorgroup} - -\def\docomparecolorgroup[#1]% - {\doifdefined{\??cr#1:1} - {\hbox - {\dodocomparecolorgroup\color[#1]% - \quad - \dodocomparecolorgroup\gray[#1]}}} - -\def\dodocomparecolorgroup#1[#2]% - {\localvbox - {\!!counta=0 - \dorecurse{15} - {\doifdefined{\??cr#2:\recurselevel}{\advance\!!counta by 1}} - \!!widtha=2em\relax - \hsize=\!!counta\!!widtha - \def\rule% - {\vrule\!!width.5\!!widtha\!!height2.25ex\!!depth-.75ex} - \def\dododocomparecolorgroup##1% - {\hbox to \hsize - {\setbox0=\hbox - {#1[#2:##1]{\vrule\!!width\hsize\!!height3ex}}% - \wd0=\!!zeropoint\box0 - \hbox to \hsize - {\hss\dorecurse{\!!counta}{#1[#2:\recurselevel]{\rule}\hss}}} - \endgraf} - \dorecurse{\!!counta}{\dododocomparecolorgroup\recurselevel}}} - -%D \macros -%D {showcolor} -%D {} -%D -%D But let's not forget that we also have the more traditional -%D non||related colors. These show up after: -%D -%D \starttypen -%D \showcolor [name] -%D \stoptypen -%D -%D Where \type{name} for instance can be \type{rgb}. -%D -%D \showsetup{\y!showcolor} - -\def\showcolor[#1]% - {\bgroup - \setupcolor[#1] - \stelwitruimtein[\v!geen] - \def\rule% - {\vrule\!!width4em\!!height\ht\strutbox\!!depth\dp\strutbox} - \def\docommand##1% - {\hbox - {\gray[##1]{\rule}\quad - \color[##1]{\rule}\quad - \grayvalue{##1}\quad - \hbox to 12em{\colorvalue{##1}\hss}% - \strut##1} - \endgraf} - \processcommacommand[\colorlist]\docommand - \egroup} - -%D \macros -%D {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 \starttypen -%D \negativecolorbox0 -%D \stoptypen -%D -%D will negate the colors in box zero. - -\def\negatecolorbox#1% - {\setbox#1=\hbox - {\dostartnegative - \localstartcolor[white]% - \vrule\!!height\ht#1\!!depth\dp#1\!!width\wd#1% - \localstopcolor - \hskip-\wd#1% - \box#1\dostopnegative}} - -%D \macros -%D {ifMPgraphics, MPcolor} -%D -%D A very special macro is \type{\MPcolor}. This one can be -%D used to pass a \CONTEXT\ color to \METAPOST. -%D -%D \starttypen -%D \MPcolor{my own red} -%D \stoptypen -%D -%D This macro returns a \METAPOST\ triplet \type{(R,G,B)}. -%D Only \kap{RGB} colors and gray scales are supported. - -\ifx\MPgraphicstrue\undefined - \newif\ifMPgraphics\MPgraphicstrue -\fi - -\def\MPcolor#1% - {\ifMPgraphics - \@EA\@EA\@EA\doMPcolor\csname\??cr#1\endcsname::::\end - \else - #1% - \fi} - -\def\doMPcolor#1:#2:#3:#4:#5\end% - {\if#1R(#2,#3,#4)\else\if#2G(#2,#2,#3)\else(1,1,1)\fi\fi} - -%D We default to the colors defined in \module{colo-rgb} and -%D support both \kap{RGB} and \kap{CMYK} output. - -\setupcolor - [\v!rgb] - -\setupcolors - [\c!status=\v!stop, - \c!conversie=\v!ja, - \c!reductie=\v!nee, - \c!rgb=\v!ja, - \c!cmyk=\v!ja] - -%D As we can see, color support is turned off by default. -%D Reduction of gray colors to gray scales is turned on. - -\protect - -\endinput +%D \module
+%D [ file=colo-ini,
+%D version=1997.4.1,
+%D title=\CONTEXT\ Color Macros,
+%D subtitle=Initialization,
+%D author=Hans Hagen,
+%D date=\currentdate,
+%D copyright={PRAGMA / Hans Hagen \& Ton Otten}]
+%C
+%C This module is part of the \CONTEXT\ macro||package and is
+%C therefore copyrighted by \PRAGMA. Non||commercial use is
+%C granted.
+
+\writestatus{loading}{Context Color Macros}
+
+\unprotect
+
+%D Color support is not present in \TEX. Colorful output can
+%D however be accomplished by using specials. This also means
+%D that this support depends on the \DVI\ driver used. At the
+%D moment this module was written, still no decent standard on
+%D color specials has been agreed upon. We therefore decided to
+%D implement a mechanism that is as independant as possible of
+%D drivers.
+%D
+%D Color support shares with fonts that is must be implemented
+%D in a way that permits processing of individual \DVI\ pages.
+%D Furthermore it should honour grouping. The first condition
+%D forces us to use a scheme that keeps track of colors at
+%D page boundaries. This can be done by means of \TEX's
+%D marking mechanism (\type{\mark}).
+%D
+%D When building pages, \TEX\ periodically looks at the
+%D accumulated typeset contents and breaks the page when
+%D suitable. At that moment, control is transfered to the
+%D output routine. This routine takes care of building the
+%D pagebody and for instance adds headers and footers. The page
+%D can be broken in the middle of some colored text, but
+%D headers and footers are often in black upon white or
+%D background. If colors are applied there, they definitely
+%D are used local, which means that they don't cross page
+%D borders.
+%D
+%D Boxes are handled as a whole, which means that when we
+%D apply colors inside a box, those colors don't cross page
+%D boundaries, unless of course boxes are split or unboxed.
+%D Especially in interactive texts, colors are often used in
+%D such a local way: in boxes (buttons and navigational tools)
+%D or in the pagebody (backgrounds).
+%D
+%D So we can distinguish local colors, that don't cross
+%D pages from global colors, of which we can end many pages
+%D later. The color macros will treat both types in a different
+%D way, thus gaining some speed.
+%D
+%D This module also deals with gray scales. Because similar
+%D colors can end up in the same gray scale when printed in
+%D black and white, we also implement a palet system that deals
+%D with these matters. Because of fundamental differences
+%D between color and gray scale printing, in \CONTEXT\ we also
+%D differ between these. For historic reasons |<|we first
+%D implemented gray scales using patterns of tiny periods|>|
+%D and therefore called them {\em rasters}. So don't be
+%D surprised if this term shows up.
+
+\startmessages dutch library: colors
+ title: kleur
+ 1: systeem -- is globaal actief
+ 2: systeem -- is lokaal actief
+ 3: -- is niet gedefinieerd
+ 4: systeem -- wordt geladen
+ 5: onbekend systeem --
+ 6: palet -- is beschikbaar
+ 7: palet -- is niet beschikbaar
+ 8: (verkeerde) specificatie -- bij -- wordt zwart
+ 9: -- kleurruimte wordt niet ondersteund
+ 10: -- kleurruimte wordt ondersteund
+ 11: kleur wordt vertaald in grijs
+\stopmessages
+
+\startmessages english library: colors
+ title: color
+ 1: system -- is global activated
+ 2: system -- is local activated
+ 3: -- is not defined
+ 4: system -- is loaded
+ 5: unknown system --
+ 6: palette -- is available
+ 7: palette -- is not available
+ 8: (invalid) specification -- at color -- becomes black
+ 9: -- color space is not supported
+ 10: -- color space is supported
+ 11: color is converted to gray
+\stopmessages
+
+\startmessages german library: colors
+ title: farbe
+ 1: system -- ist global aktiviert
+ 2: system -- ist lokal aktiviert
+ 3: -- ist undefiniert
+ 4: system -- ist geladen
+ 5: unbekanntes System --
+ 6: palette -- ist verfuegbar
+ 7: palette -- ist nicht verfuegbar
+ 8: (ungueltige) Spezifikation -- bei Farbe -- wird schwarz
+ 9: -- Farbraum wird nicht unterstuetzt
+ 10: -- Farbraum wird unterstuetzt
+ 11: Farbe wird in Grau umgewandelt
+\stopmessages
+
+%D \macros
+%D {definecolor}
+%D {}
+%D
+%D We will enable users to specify colors in \kap{RGB} and
+%D \kap{CMYK} color spaces or gray scales using
+%D
+%D \showsetup{\y!definecolor}
+%D
+%D For example:
+%D
+%D \starttypen
+%D \definecolor [SomeKindOfRed] [r=.8,g=.05,b=.05]
+%D \stoptypen
+%D
+%D Such color specifications are saved in a macro in the
+%D following way:
+%D
+%D \starttypen
+%D \setvalue{\??cr name}{R:r:g:b}
+%D \setvalue{\??cr name}{C:c:m:y:k}
+%D \setvalue{\??cr name}{S:s}
+%D \stoptypen
+%D
+%D Gray scales are specified with the \type{s} parameter,
+%D where the is derived from screen.
+
+\def\colorlist{}
+
+\def\@@cl@@z{0}
+\def\@@cl@@o{1}
+
+\def\definecolor%
+ {\dodoubleargument\dodefinecolor}
+
+\def\dodefinecolor[#1][#2]%
+ {% beware
+\saveglobal
+ \addtocommalist{#1}\colorlist
+\restoreglobal
+ \doifassignmentelse{#2}
+ {\let\@@cl@@r=\@@cl@@z\let\@@cl@@g=\@@cl@@z\let\@@cl@@b=\@@cl@@z
+ \let\@@cl@@c=\@@cl@@z\let\@@cl@@m=\@@cl@@z\let\@@cl@@y=\@@cl@@z
+ \let\@@cl@@k=\@@cl@@z\let\@@cl@@s=\@@cl@@z
+ \getparameters[\??cl @@][#2]%
+ \doifelse{\@@cl@@r\@@cl@@g\@@cl@@b}{\@@cl@@z\@@cl@@z\@@cl@@z}
+ {\doifelse{\@@cl@@c\@@cl@@m\@@cl@@y\@@cl@@k}{\@@cl@@z\@@cl@@z\@@cl@@z\@@cl@@z}
+ {\doifelse{\@@cl@@s}{\@@cl@@z}
+ {\showmessage{\m!colors}{8}{{[#2]},#1}%
+ \redoglobal\setevalue{\??cr#1}{S:\@@cl@@z}}
+ {\redoglobal\setevalue{\??cr#1}{S:\@@cl@@s}}}
+ {\redoglobal\setevalue{\??cr#1}{C:\@@cl@@c:\@@cl@@m:\@@cl@@y:\@@cl@@k}}}
+ {\redoglobal\setevalue{\??cr#1}{R:\@@cl@@r:\@@cl@@g:\@@cl@@b}}}
+ {\doifdefinedelse{\??cr#2}
+ {\redoglobal\setevalue{\??cr#1}{\getvalue{\??cr#2}}}
+ {\showmessage{\m!colors}{3}{#1}}}%
+ \dodoglobal\setvalue{#1}{\color[#1]}}
+
+%D The names of colors are stored in a comma separated list
+%D only for the purpose of showing them with \type{\showcolor}.
+%D
+%D Colors can be defined global by using \type{\doglobal},
+%D like in
+%D
+%D \startbuffer
+%D \doglobal\definecolor [SomeKindOfRed] [r=.8,g=.05,b=.05]
+%D \stopbuffer
+%D
+%D \typebuffer
+%D
+%D \haalbuffer
+%D
+%D This color shows up as \color[SomeKindOfRed]{some kind
+%D of red}.
+
+%D \macros
+%D {setupcolor}
+%D {}
+%D
+%D Color definitions can be grouped in files with the name:
+%D
+%D \starttypen
+%D \f!colorprefix-identifier.tex
+%D \stoptypen
+%D
+%D where \type{\f!colorprefix} is \unprotect {\tttf \f!colorprefix}.
+%D Loading such a file is done by \protect
+%D
+%D \showsetup{\y!setupcolor}
+%D
+%D Some default colors are specified in \type{colo-rgb.tex},
+%D which is loaded into the format by:
+%D
+%D \starttypen
+%D \setupcolor[rgb]
+%D \stoptypen
+
+\def\colorstyle{}
+
+\def\setupcolor%
+ {\dosingleargument\dosetupcolor}
+
+\def\dosetupcolor[#1]%
+ {\doifnot{#1}{\colorstyle}
+ {\def\colorstyle{#1}%
+ \def\dodosetupcolor##1%
+ {\makeshortfilename[\f!colorprefix\truefilename{##1}]%
+ \readsysfile{\shortfilename}%
+ {\showmessage{\m!colors}{4}{\colorstyle}}
+ {\showmessage{\m!colors}{5}{\colorstyle}}}%
+ \processcommalist[#1]\dodosetupcolor}}
+
+%D When typesetting for paper, we prefer using the \kap{CMYK}
+%D color space, but for on||screen viewing we prefer \kap{RGB}
+%D (the previous implementation supported only this scheme).
+%D Independant of such specifications, we support some automatic
+%D conversions:
+%D
+%D \startopsomming[opelkaar]
+%D \som convert all colors to \kap{RGB}
+%D \som convert all colors to \kap{CMYK}
+%D \som convert all colors to gray scales
+%D \stopopsomming
+%D
+%D We also support optimization of colors to gray scales.
+%D
+%D \startopsomming[verder]
+%D \som reduce gray colors to gray scales
+%D \som reduce \kap{CMY} components to \kap{K}
+%D \stopopsomming
+%D
+%D These options are communicated by means of:
+
+\newif\ifRGBsupported
+\newif\ifCMYKsupported
+\newif\ifconverttoGRAY
+\newif\ifpreferGRAY
+\newif\ifGRAYprefered
+\newif\ifreduceCMYK
+
+%D The last boolean controls reduction of \kap{CMYK} to
+%D \kap{CMY} colors. When set to true, the black component
+%D is added to the other ones.
+
+%D Color modes are entered using the next set of commands.
+%D The \type{\stop} alternatives are implemented in a way
+%D that permits non||grouped use.
+
+\def\dostartcolormodeR#1:#2:#3\od%
+ {\bgroup
+ \def\@@cl@@r{#1}\def\@@cl@@g{#2}\def\@@cl@@b{#3}%
+ \ifpreferGRAY\ifx\@@cl@@r\@@cr@@g\ifx\@@cl@@r\@@cl@@b
+ \GRAYpreferedtrue
+ \fi\fi\fi
+ \ifGRAYprefered
+ \dostartgraycolormode\@@cl@@r
+ \else\ifRGBsupported
+ \dostartrgbcolormode\@@cl@@r\@@cl@@g\@@cl@@b
+ \else\ifCMYKsupported
+ \convertRGBtoCMYK\@@cl@@r\@@cl@@g\@@cl@@b
+ \dostartcmykcolormode\@@cl@@c\@@cl@@m\@@cl@@y\@@cl@@k
+ \else
+ \convertRGBtoGRAY\@@cl@@r\@@cl@@g\@@cl@@b
+ \dostartgraycolormode\@@cl@@s
+ \fi\fi\fi
+ \egroup}
+
+\def\dostartcolormodeC#1:#2:#3:#4\od%
+ {\bgroup
+ \def\@@cl@@c{#1}\def\@@cl@@m{#2}\def\@@cl@@y{#3}\def\@@cl@@k{#4}%
+ \ifpreferGRAY\ifx\@@cl@@k\@@cl@@z\ifx\@@cl@@c\@@cr@@m\ifx\@@cl@@c\@@cl@@y
+ \GRAYpreferedtrue
+ \fi\fi\fi\fi
+ \ifGRAYprefered
+ \dostartgraycolormode\@@cl@@c
+ \else\ifCMYKsupported
+ \ifreduceCMYK
+ \convertCMYKtoCMY\@@cl@@c\@@cl@@m\@@cl@@y\@@cl@@k
+ \dostartcmykcolormode\@@cl@@c\@@cl@@m\@@cl@@y\@@cl@@k
+ \else
+ \dostartcmykcolormode\@@cl@@c\@@cl@@m\@@cl@@y\@@cl@@k
+ \fi
+ \else\ifRGBsupported
+ \convertCMYKtoRGB\@@cl@@c\@@cl@@m\@@cl@@y\@@cl@@k
+ \dostartrgbcolormode\@@cl@@r\@@cl@@g\@@cl@@b
+ \else
+ \convertCMYKtoGRAY\@@cl@@c\@@cl@@m\@@cl@@y\@@cl@@k
+ \dostartgraycolormode\@@cl@@s
+ \fi\fi\fi
+ \egroup}
+
+\def\dostartcolormodeS#1\od%
+ {\dostartgraycolormode{#1}}
+
+%D Prefering gray is not the same as converting to gray. Conversion treats
+%D each color components in a different way, while prefering is just a
+%D reduction and thus a space||saving option.
+
+%D \macros
+%D {startcolormode,stopcolormode}
+%D
+%D We use \type{\stopcolormode} to reset the color in
+%D whatever color space and do so by calling the corresponding
+%D special. Both commands can be used for fast color
+%D switching, like in colored verbatim,
+
+\def\dostartcolormode#1:%
+ {\getvalue{dostartcolormode#1}}
+
+\def\startcolormode#1%
+ {\doifcolorelse{#1}
+ {\getcurrentcolorspecs{#1}%
+ \expandafter\dostartcolormode\currentcolorspecs\od}
+ {\dostopcolormode}}
+
+\def\stopcolormode%
+ {\dostopcolormode}
+
+%D We use some reserved names for local color components.
+%D Consistent use of these scratch variables saves us
+%D unneccessary hash entries.
+%D
+%D \starttypen
+%D \@@cl@@r \@@cl@@g \@@cl@@b
+%D \@@cl@@c \@@cl@@m \@@cl@@y \@@cl@@k
+%D \@@cl@@s
+%D \stoptypen
+%D
+%D We implement several conversion routines.
+%D
+%D \starttypen
+%D \convertRGBtoCMYK {r} {g} {b}
+%D \convertRGBtoGRAY {r} {g} {b}
+%D \convertCMYKtoRGB {c} {m} {y} {k}
+%D \convertCMYKtoGRAY {c} {m} {y} {k}
+%D \convertCMYKtoCMY {c} {m} {y} {k}
+%D \stoptypen
+%D
+%D The relation between \kap{Gray}, \kap{RGB} and \kap{CMYK}
+%D is:
+%D
+%D \plaatsformule[-]
+%D \startformule
+%D G = .30r + .59g + .11b
+%D = 1.0 - \min(1.0,\ .30c + .59m + .11y + k)
+%D \stopformule
+%D
+%D When converting from \kap{CMYK} to \kap{RGB} we use the
+%D formula:
+%D
+%D \plaatsformule[-]
+%D \startformule
+%D \eqalign
+%D {r &= 1.0 - \min(1.0,\ c+k) \cr
+%D g &= 1.0 - \min(1.0,\ m+k) \cr
+%D b &= 1.0 - \min(1.0,\ y+k)}
+%D \stopformule
+%D
+%D In the conversion routine the color components are calculated
+%D in three digits precision.
+
+\def\realcolorvalue#1%
+ {\ifnum #1<10 0.00\the#1%
+ \else\ifnum#1<100 0.0\the#1%
+ \else\ifnum#1<1000 0.\the#1%
+ \else 1\fi\fi\fi}
+
+\def\doconvertCMYKtoRGB#1\k#2\to#3%
+ {\scratchdimen=#1\s!pt
+ \advance\scratchdimen by #2\s!pt\relax
+ \ifdim\scratchdimen>1\s!pt
+ \scratchdimen=-1\s!pt
+ \else
+ \scratchdimen=-\scratchdimen
+ \fi
+ \advance\scratchdimen by 1\s!pt
+ \multiply\scratchdimen by 1000
+ \scratchcounter=\scratchdimen
+ \advance\scratchcounter by \!!medcard
+ \divide\scratchcounter by \!!maxcard
+ \edef#3{\realcolorvalue\scratchcounter}}
+
+\def\convertCMYKtoRGB#1#2#3#4%
+ {\doconvertCMYKtoRGB#1\k#4\to\@@cl@@r
+ \doconvertCMYKtoRGB#2\k#4\to\@@cl@@g
+ \doconvertCMYKtoRGB#3\k#4\to\@@cl@@b}
+
+\def\doconvertRGBtoCMYK#1\to#2%
+ {\scratchdimen=#1\s!pt
+ \multiply\scratchdimen by 1000
+ \scratchcounter=\scratchdimen
+ \advance\scratchcounter by \!!medcard
+ \divide\scratchcounter by \!!maxcard
+ \scratchcounter=-\scratchcounter
+ \advance\scratchcounter by 1000
+ \edef#2{\realcolorvalue\scratchcounter}}
+
+\def\convertRGBtoCMYK#1#2#3%
+ {\doconvertRGBtoCMYK#1\to\@@cl@@c
+ \doconvertRGBtoCMYK#2\to\@@cl@@m
+ \doconvertRGBtoCMYK#3\to\@@cl@@y
+ \let\@@cl@@k=\@@cl@@z}
+
+\def\convertRGBtoGRAY#1#2#3%
+ {\scratchdimen=#1\s!pt
+ \scratchdimen=300\scratchdimen
+ \scratchcounter=\scratchdimen
+ \scratchdimen=#2\s!pt
+ \scratchdimen=590\scratchdimen
+ \advance\scratchcounter by \scratchdimen
+ \scratchdimen=#3\s!pt
+ \scratchdimen=110\scratchdimen
+ \advance\scratchcounter by \scratchdimen
+ \advance\scratchcounter by \!!medcard
+ \divide\scratchcounter by \!!maxcard
+ \edef\@@cl@@s{\realcolorvalue\scratchcounter}}
+
+\def\convertCMYKtoGRAY#1#2#3#4%
+ {\convertCMYKtoRGB{#1}{#2}{#3}{#4}%
+ \convertRGBtoGRAY\@@cl@@r\@@cl@@g\@@cl@@b}
+
+\def\doconvertCMYKtoCMY#1\k#2\to#3%
+ {\scratchdimen=#1\s!pt
+ \advance\scratchdimen by #2\s!pt\relax
+ \ifdim\scratchdimen>1\s!pt
+ \scratchdimen=1\s!pt
+ \else
+ \scratchdimen=\scratchdimen
+ \fi
+ \multiply\scratchdimen by 1000
+ \scratchcounter=\scratchdimen
+ \advance\scratchcounter by \!!medcard
+ \divide\scratchcounter by \!!maxcard
+ \edef#3{\realcolorvalue\scratchcounter}}
+
+\def\convertCMYKtoCMY#1#2#3#4%
+ {\doconvertCMYKtoCMY#1\k#4\to\@@cl@@c
+ \doconvertCMYKtoCMY#2\k#4\to\@@cl@@m
+ \doconvertCMYKtoCMY#3\k#4\to\@@cl@@y
+ \let\@@cl@@k=\@@cl@@z}
+
+%D We already mentioned that colors interfere with building
+%D the pagebody. This means that when the page is composed,
+%D the colors temporary have to be reset. After the page is
+%D shipped out, we have to revive the current color.
+%D
+%D We use \type{\marks} to keep track of colors across page
+%D boundaries. Unfortunately standard \TEX\ supports only one mark,
+%D and using this one for color support only would be a waste.
+%D We therefore use an adapted version of J.~Fox's multiple mark
+%D mechanism as (re|)|implemented in \module{supp-mrk}.
+
+\doifdefinedelse{newmark}
+ {\newmark\colormark}
+ {\def\colormark#1{}}
+
+%D Using this mark mechanism with lots of colors has one
+%D major drawback: \TEX's memory tends to overflow when
+%D very colorful text is stored in a global box. Even worse is that
+%D the processing time grows considerably. We therefore support
+%D local as well as global color switching.
+%D
+%D Of the next macros, \type{\popcolor} is to be used after
+%D the actual \type{\shipout} and \type{\startcolorpage} and
+%D \type{\stopcolorpage} are called when entering and leaving
+%D the \type{\pagebody} builder. In case of emergencies
+%D \type{\pushcolor} can be used to undo the current color,
+%D for instance when insertions are appended to the page.
+
+%D Before we present the color macros, we first define the
+%D setup command. This command takes care of setting up the
+%D booleans that control local and global behavior and
+%D conversion to other color spaces.
+
+\newif\ifincolor
+\newif\iflocalcolor
+
+\def\setupcolors%
+ {\dosingleargument\dosetupcolors}
+
+\def\dosetupcolors[#1]%
+ {\getparameters[\??cl][#1]%
+ \doifelse{\@@clreductie}{\v!ja}
+ {\reduceCMYKtrue}
+ {\reduceCMYKfalse}%
+ \doifelse{\@@clrgb}{\v!nee}
+ {\showmessage{\m!colors}{9}{\v!rgb}\RGBsupportedfalse}
+ {\showmessage{\m!colors}{10}{\v!rgb}\RGBsupportedtrue}%
+ \doifelse{\@@clcmyk}{\v!nee}
+ {\showmessage{\m!colors}{9}{\v!cmyk}\CMYKsupportedfalse}
+ {\showmessage{\m!colors}{10}{\v!cmyk}\CMYKsupportedtrue}%
+ \processaction
+ [\@@clconversie]
+ [ \v!ja=>\preferGRAYtrue,
+ \v!nee=>\preferGRAYfalse,
+ \v!altijd=>\preferGRAYtrue
+ \RGBsupportedfalse
+ \CMYKsupportedfalse,
+ \s!default=>\preferGRAYfalse,
+ \s!unknown=>\preferGRAYfalse]%
+ \ifRGBsupported
+ \converttoGRAYfalse
+ \forcegrayMPcolorsfalse
+ \else\ifCMYKsupported
+ \converttoGRAYfalse
+ \forcegrayMPcolorsfalse
+ \convertMPcolorstrue
+ \ifreduceCMYK
+ \reduceMPcolorstrue
+ \fi
+ \else
+ \converttoGRAYtrue
+ \forcegrayMPcolorstrue
+ \convertMPcolorsfalse
+ \reduceMPcolorsfalse
+ \showmessage{\m!colors}{11}{}%
+ \fi\fi
+ \processaction
+ [\@@clstatus]
+ [\v!globaal=>\incolortrue\localcolorfalse
+ \showmessage{\m!colors}{1}{\colorstyle},
+ \v!lokaal=>\incolortrue\localcolortrue
+ \showmessage{\m!colors}{2}{\colorstyle},
+ \v!start=>\let\@@clstatus=\v!globaal
+ \incolortrue\localcolorfalse
+ \showmessage{\m!colors}{1}{\colorstyle},
+ \v!stop=>\incolorfalse\localcolorfalse
+ \forcegrayMPcolorstrue]}
+
+%D \macros
+%D {doifcolorelse}
+%D {}
+%D
+%D Switching to a color is done by means of the following
+%D command. Later on we will explain the use of palets. We
+%D define ourselves a color conditional first.
+
+\def\currentpalet{}
+
+\def\doifcolorelse#1%
+ {\doifdefinedelse{\??cr\currentpalet#1}}
+
+\def\getcurrentcolorspecs#1%
+ {\edef\currentcolorspecs{\getvalue{\??cr\currentpalet#1}}}
+
+%D \macros
+%D {localstartcolor,localstopcolor}
+%D {}
+%D
+%D Simple color support, that is without nesting, is provided
+%D by:
+
+\def\localstartcolor[#1]%
+ {\ifincolor
+ \localcolortrue
+ \doglobalstartcolor[#1]%
+ \fi}
+
+\def\localstopcolor%
+ {\ifincolor
+ \doglobalstopcolor
+ \fi}
+
+%D \macros
+%D {startcolor,stopcolor}
+%D {}
+%D
+%D The more save method, the one that saves the current color
+%D state and returns to this state afterward, is activated by:
+%D
+%D \showsetup{\y!startcolor}
+
+\def\startcolor[#1]%
+ {\ifincolor
+ \doglobalstartcolor[#1]%
+ \fi}
+
+\def\stopcolor%
+ {\ifincolor
+ \doglobalstopcolor
+ \fi}
+
+%D This macros call the global color switching ones. Starting
+%D a global, i.e. a possible page boundary crossing, color
+%D mode also sets a \type{\mark} in \TEX's internal list.
+
+\newcount\colorlevel
+
+\setvalue{\??cl0C}{} % saved color
+\setvalue{\??cl0S}{} % stop command
+
+\def\dodoglobalstartcolor[#1]%
+ {\xdef\currentcolor{\getvalue{\??cl\the\colorlevel C}}%
+ \global\advance\colorlevel by 1
+ \setxvalue{\??cl\the\colorlevel C}{#1}%
+ \debuggerinfo{\m!colors}
+ {start #1 at level \the\colorlevel}%
+ \doifelsenothing{#1}
+ {\setxvalue{\??cl\the\colorlevel C}{\currentcolor}%
+ \setgvalue{\??cl\the\colorlevel S}{\donoglobalstopcolor}}
+ {\doifelse{#1}{\currentcolor}
+ {\setgvalue{\??cl\the\colorlevel S}{\donoglobalstopcolor}}
+ {\doifcolorelse{#1}
+ {\docolormark{#1}%
+ \setgvalue{\??cl\the\colorlevel S}{\dodoglobalstopcolor}%
+ \startcolormode{#1}}
+ {\setgvalue{\??cl\the\colorlevel S}{\donoglobalstopcolor}%
+ \showmessage{\m!colors}{3}{#1}}}}}
+
+\def\doglobalstartcolor[#1]%
+ {\ifnum\colorlevel=0
+ \doifelsenothing{#1}
+ {\setgvalue{\??cl\the\colorlevel S}{}}
+ {\dodoglobalstartcolor[#1]}%
+ \else
+ \dodoglobalstartcolor[#1]%
+ \fi
+ \ignorespaces}
+
+\def\donoglobalstopcolor%
+ {\ifnum\colorlevel>0
+ \xdef\currentcolor{\getvalue{\??cl\the\colorlevel C}}%
+ \debuggerinfo{\m!colors}
+ {stop \currentcolor\normalspace at level \the\colorlevel}%
+ \global\advance\colorlevel by -1
+ \fi}
+
+\def\dodoglobalstopcolor%
+ {\ifnum\colorlevel>0
+ \donoglobalstopcolor
+ \xdef\previouscolor{\getvalue{\??cl\the\colorlevel C}}%
+ \ifnum\colorlevel=0
+ \docolormark{}%
+ \stopcolormode
+ \else % let's do a bit redundant testing here
+ \docolormark{\previouscolor}%
+ \doifelsenothing{\previouscolor}
+ {\dostopcolormode}
+ {\doifcolorelse{\previouscolor}
+ {\doifnot{\currentcolor}{\previouscolor}
+ {\startcolormode{\previouscolor}}}
+ {\dostopcolormode}}%
+ \fi
+ \fi}
+
+\def\doglobalstopcolor%
+ {\getvalue{\??cl\the\colorlevel S}}
+
+%D We don't use grouping and save each stop alternative. This
+%D permits be especially useful in for instance local color
+%D support in verbatim. Using \type{\bgroup}||\type{\egroup}
+%D pairs could interfere with calling commands
+
+%D This color mechanism takes care of nested colors, like in:
+%D
+%D \startbuffer
+%D \kleur[groen]{groen \kleur[groen]{groen \kleur[rood]{rood}} groen}
+%D \kleur[groen]{groen \kleur[]{groen \kleur[rood]{rood}} groen}
+%D \kleur[groen]{groen \kleur[rood]{rood \kleur[rood]{rood}} groen}
+%D \kleur[groen]{groen \kleur[groen]{groen \kleur[]{groen}} groen}
+%D \kleur[groen]{groen \kleur[rood]{rood} groen}
+%D \kleur[groen]{groen \kleur[]{groen} groen}
+%D \kleur[]{zwart \kleur[rood]{rood} zwart}
+%D \kleur[]{zwart}
+%D \stopbuffer
+%D
+%D \typebuffer
+%D
+%D or
+%D
+%D \startvoorbeeld
+%D \startregels
+%D \haalbuffer
+%D \stopregels
+%D \stopvoorbeeld
+%D
+%D Crossing page boundaries is of course also handled.
+%D Undefined or empty color specifications are treated as
+%D efficient as possible.
+%D
+%D \startbuffer
+%D \startkleur[groen]
+%D [groen] \input tufte [groen] \par
+%D \startkleur[]
+%D [groen] \input knuth [groen] \par
+%D \startkleur[rood]
+%D [rood] \input tufte [rood] \par
+%D \startkleur[geel]
+%D [geel] \input knuth [geel] \par
+%D \stopkleur
+%D [rood] \input tufte [rood] \par
+%D \stopkleur
+%D [groen] \input knuth [groen] \par
+%D \stopkleur
+%D [groen] \input tufte [groen] \par
+%D \stopkleur
+%D \stopbuffer
+%D
+%D \startvoorbeeld
+%D \haalbuffer
+%D \stopvoorbeeld
+%D
+%D These quotes are typeset by saying:
+%D
+%D \typebuffer
+%D
+%D Out of efficiency we only use marks when needed. The next
+%D macro tries to find out if indeed a mark should be set.
+%D This macro uses the boolean \type{\ifinpagebody}, which can
+%D be defined and set in the module that handles the pagebody.
+
+\ifx\ifinpagebody\undefined \newif\ifinpagebodytrue \fi
+
+\def\docolormark#1%
+ {\ifinpagebody \else
+ \iflocalcolor \else
+ \dodocolormark{#1}%
+ \fi
+ \fi}
+
+\let\lastcolormark=\empty
+
+\def\dodocolormark#1%
+ {\doifnot{#1}{\lastcolormark}
+ {\colormark{#1}%
+ \xdef\lastcolormark{#1}}}
+
+%D \macros
+%D {pushcolor, popcolor}
+%D {}
+%D
+%D Pushing the current state in the output routine simply comes
+%D to resetting the color to black, while popping restores the
+%D color state to that of before the break.
+
+\def\pushcolor%
+ {\stopcolormode}
+
+\def\popcolor%
+ {\doifsomething{\botcolormark}
+ {\debuggerinfo{\m!colors}{popping \botcolormark}%
+ \startcolormode{\botcolormark}}}
+
+\def\popsplitcolor%
+ {\getsplitmarks\colormark % hier wel
+ \doifsomething{\botcolormark}
+ {\debuggerinfo{\m!colors}{split popping \botcolormark}%
+ \startcolormode{\botcolormark}}}
+
+%D \macros
+%D {startcolorpage, stopcolorpage}
+%D {}
+%D
+%D Local use can be forced with the next two macros. Nesting
+%D is still supported but colors are no longer marked.
+
+%D \starttypen
+%D \def\startcolorpage%
+%D {\bgroup
+%D \let\docolormark=\gobbleoneargument
+%D \edef\savedcolorlevel{\the\colorlevel}%
+%D \ifnum\colorlevel>0
+%D \stopcolormode
+%D \fi
+%D \global\colorlevel=0\relax}
+%D
+%D \def\stopcolorpage%
+%D {\global\colorlevel=\savedcolorlevel\relax
+%D \egroup}
+%D \stoptypen
+
+%D The next alternative makes (simple) color separation more
+%D easy:
+
+\def\startcolorpage%
+ {\bgroup
+ \let\docolormark=\gobbleoneargument
+ \edef\savedcolorlevel{\the\colorlevel}%
+ \localstartcolor[black]%
+ \global\colorlevel=0\relax}
+
+\def\stopcolorpage%
+ {\localstopcolor
+ \global\colorlevel=\savedcolorlevel\relax
+ \egroup}
+
+%D \macros
+%D {color,gray}
+%D {}
+%D
+%D This leaves the simple color command:
+%D
+%D \showsetup{\y!color}
+%D \showsetup{\y!gray}
+%D
+%D Which can be used straightforward: \color[groen]{green as gras}.
+%D We want color support to be similar to font support and
+%D therefore implement \type{\color} as:
+
+\unexpanded\def\color[#1]%
+ {\groupedcommand
+ {\startcolor[#1]}
+ {\stopcolor}}
+
+\unexpanded\def\gray[#1]%
+ {\groupedcommand
+ {\RGBsupportedfalse\CMYKsupportedfalse\startcolor[#1]}
+ {\stopcolor}}
+
+%D This implementation enables use of defined colors like:
+%D
+%D \starttypen
+%D Look at the {\brightgreen bright} side of life and get
+%D yourself no \red{red} head!
+%D \stoptypen
+
+%D \macros
+%D {colorvalue, grayvalue}
+%D {}
+%D
+%D We can typeset the color components using \type{\colorvalue} and
+%D \type{\grayvalue}. The commands:
+%D
+%D \startbuffer
+%D color value of SomeKindOfRed: \colorvalue{SomeKindOfRed} \crlf
+%D gray value of SomeKindOfRed: \grayvalue{SomeKindOfRed}
+%D \stopbuffer
+%D
+%D \typebuffer
+%D
+%D show us:
+%D
+%D \startvoorbeeld
+%D \haalbuffer
+%D \stopvoorbeeld
+
+\def\realcolorformat#1%
+ {\ifnum#1<10 0.00\the#1%
+ \else\ifnum#1<100 0.0\the#1%
+ \else\ifnum#1<1000 0.\the#1%
+ \else 1.000\fi\fi\fi}
+
+\def\colorformatseparator{ }
+
+\def\dodoformatcolor#1%
+ {\scratchdimen=#1\s!pt\relax
+ \ifdim\scratchdimen>1\s!pt
+ \scratchdimen=1\s!pt
+ \fi
+ \multiply\scratchdimen by 1000
+ \scratchcounter=\scratchdimen
+ \advance\scratchcounter by \!!medcard
+ \divide\scratchcounter by \!!maxcard \relax
+ \realcolorformat\scratchcounter}
+
+\def\doformatcolorR#1:#2:#3\od%
+ {\dodoformatcolor{#1}\colorformatseparator
+ \dodoformatcolor{#2}\colorformatseparator
+ \dodoformatcolor{#3}}
+
+\def\doformatcolorC#1:#2:#3:#4\od%
+ {\dodoformatcolor{#1}\colorformatseparator
+ \dodoformatcolor{#2}\colorformatseparator
+ \dodoformatcolor{#3}\colorformatseparator
+ \dodoformatcolor{#4}}
+
+\def\doformatcolorS#1\od%
+ {\dodoformatcolor{#1}}
+
+\def\doformatcolor#1:%
+ {\getvalue{doformatcolor#1}}
+
+\def\colorvalue#1%
+ {\doifcolorelse{#1}
+ {\getcurrentcolorspecs{#1}%
+ \expandafter\doformatcolor\currentcolorspecs\od}
+ {}}
+
+\def\doformatgrayR#1:#2:#3\od%
+ {\convertRGBtoGRAY{#1}{#2}{#3}%
+ \dodoformatcolor\@@cl@@s}
+
+\def\doformatgrayC#1:#2:#3:#4\od%
+ {\convertCMYKtoGRAY{#1}{#2}{#3}{#4}%
+ \dodoformatcolor\@@cl@@s}
+
+\def\doformatgrayS#1\od%
+ {\dodoformatcolor{#1}}
+
+\def\doformatgray#1:%
+ {\getvalue{doformatgray#1}}
+
+\def\grayvalue#1%
+ {\doifcolorelse{#1}
+ {\getcurrentcolorspecs{#1}%
+ \expandafter\doformatgray\currentcolorspecs\od}
+ {}}
+
+%D \macros
+%D {locatstartraster,localstopraster,
+%D startraster,stopraster}
+%D {}
+%D
+%D The previous conversions are not linear and treat each color
+%D component according to human perception curves. Pure gray
+%D (we call them rasters) has equal color components. In
+%D \CONTEXT\ rasters are only used as backgrounds and these
+%D don't cross page boundaries in the way color does. Therefore
+%D we don't need stacks and marks. Just to be compatible with
+%D color support we offer both 'global' and 'local' commands.
+
+\def\localstartraster[#1]%
+ {\doifinstringelse{.}{#1}
+ {\dostartgraymode{#1}}
+ {\dostartgraymode{\@@rsraster}}}
+
+\def\localstopraster%
+ {\dostopgraymode}
+
+\def\startraster%
+ {\localstartraster}
+
+\def\stopraster%
+ {\localstopraster}
+
+%D In this documentation we will not go into too much details
+%D on palets. Curious users can find more information on this
+%D topic in \uit[use of color].
+%D
+%D At the moment we implemented color in \CONTEXT\ color
+%D printing was not yet on the desktop. In spite of this lack our
+%D graphics designer made colorfull illustrations. When printed
+%D on a black and white printer, distinctive colors can come
+%D out equally gray. We therefore decided to use only colors
+%D that were distinctive in colors as well as in black and
+%D white print.
+%D
+%D Although none of the graphic packages we used supported
+%D logical colors and global color redefition, we build this
+%D support into \CONTEXT. This enabled us to experiment and
+%D also prepared us for the future.
+
+%D \macros
+%D {definepalet}
+%D {}
+%D
+%D Colors are grouped in palets. The colors in such a palet can
+%D have colorful names, but best is to use names that specify
+%D their use, like {\em important} or {\em danger}. As a sort
+%D of example \CONTEXT\ has some palets predefined,
+%D like:\voetnoot{At the time I wrote the palet support, I was
+%D reading 'A hort history of time' of S.~Hawkins, so that's
+%D why we stuck to quarks.}
+%D
+%D \starttypen
+%D \definepalet
+%D [alfa]
+%D [ top=rood:7,
+%D bottom=groen:6,
+%D up=blauw:5,
+%D down=cyaan:4,
+%D strange=magenta:3,
+%D charm=geel:2]
+%D \stoptypen
+%D
+%D It's formal definition is:
+%D
+%D \showsetup{\y!definepalet}
+%D
+%D Visualized, such a palet looks like:
+%D
+%D \startbuffer[palet]
+%D \showpalet [alfa] [horizontaal,naam,nummer,waarde]
+%D \stopbuffer
+%D
+%D \startregelcorrectie
+%D \haalbuffer[palet]
+%D \stopregelcorrectie
+%D
+%D This bar shows both the color and gray alternatives of the
+%D palet components (not visible in black and white print).
+%D
+%D When needed, one can copy a palet by saying:
+%D
+%D \starttypen
+%D \definepalet [TEXcolorpretty] [colorpretty]
+%D \stoptypen
+%D
+%D This saves us some typing in for instance the modules that
+%D deal with pretty verbatim typesetting.
+
+\def\definepalet%
+ {\dodoubleargument\dodefinepalet}
+
+\def\dodefinepalet[#1][#2]%
+ {\doifassignmentelse{#2}
+ {\setvalue{\??pa#1}{}%
+ \setevalue{\??pa\??pa#1}{#2}%
+ \showmessage{\m!colors}{6}{#1}%
+ \def\dodododefinepalet[##1=##2]%
+ {\doifvaluesomething{\??pa#1}
+ {\setevalue{\??pa#1}{\getvalue{\??pa#1},}}%
+ \setevalue{\??pa#1}{\getvalue{\??pa#1}##1}%
+ \doifdefinedelse{\??cr##2}
+ {\setevalue{\??cr#1:##1}{\getvalue{\??cr##2}}}
+ {\setevalue{\??cr#1:##1}{S:0}}}%
+ \def\dododefinepalet##1%
+ {\dodododefinepalet[##1]}%
+ \processcommalist[#2]\dododefinepalet}
+ {\doifdefined{\??pa#2}
+ {\expanded{\dodefinepalet[#1][\getvalue{\??pa\??pa#2}]}}}}
+
+%D \macros
+%D {setuppalet}
+%D {}
+%D
+%D Colors are taken from the current palet, if defined.
+%D Setting the current palet is done by:
+%D
+%D \showsetup{\y!setuppalet}
+
+\def\currentpalet{}
+
+\def\setuppalet%
+ {\dosingleempty\dosetuppalet}
+
+\def\dosetuppalet[#1]%
+ {\doifelsenothing{#1}
+ {\def\currentpalet{}}
+ {\doifelsevaluenothing{\??pa#1}
+ {\showmessage{\m!colors}{7}{#1}%
+ \def\currentpalet{}}
+ {\def\currentpalet{#1:}}}}
+
+%D \macros
+%D {showpalet}
+%D {}
+%D
+%D The previous visualization was typeset with:
+%D
+%D \typebuffer[palet]
+%D
+%D This commands is defined as:
+%D
+%D \showsetup{\y!showpalet}
+
+\def\showpalet%
+ {\dodoubleargument\doshowpalet}
+
+\def\doshowpalet[#1][#2]%
+ {\doifdefined{\??pa#1}
+ {\doifinsetelse{\v!vertikaal}{#2}
+ {\showverticalpalet[#1][#2]}
+ {\showhorizontalpalet[#1][#2]}}}
+
+\def\showverticalpalet[#1][#2]%
+ {\localvbox
+ {\offinterlineskip
+ \setuppalet[#1]
+ \def\rule%
+ {\vrule\!!width3em\!!height\ht\strutbox\!!depth\dp\strutbox}
+ \tabskip\!!zeropoint
+ \def\doshowpalet##1%
+ {\doifinsetelse{\v!nummer}{#2}{##1\hskip.5em}{}&
+ \color[##1]{\rule}\gray[##1]{\rule}&
+ \doifinset{\v!waarde}{#2}{\hskip.5em\colorvalue{##1}}\crcr}
+ \halign
+ {\hss##&\hss##\hss&##\cr
+ &\doifinset{\v!naam}{#2}{\strut#1}&\cr%
+ \processpalet[#1]\doshowpalet\crcr}}}
+
+\def\showhorizontalpalet[#1][#2]%
+ {\localvbox
+ {\offinterlineskip
+ \setuppalet[#1]
+ \tabskip\!!zeropoint
+ \!!widtha=\!!zeropoint
+ \doifinset{\v!nummer}{#2}
+ {\def\doshowpalet##1%
+ {\setbox0=\hbox{##1}%
+ \ifdim\!!widtha<\wd0\!!widtha=\wd0\fi}%
+ \processpalet[#1]\doshowpalet}%
+ \advance\!!widtha by 1em
+ \ifdim\!!widtha<5em
+ \!!widtha=5em
+ \fi
+ \halign
+ {##&&\hbox to \!!widtha{\hss##\hss}\cr
+ \doifinset{\v!nummer}{#2}
+ {\def\doshowpalet##1{&\strut##1}%
+ \processpalet[#1]\doshowpalet}\cr
+ \doifinset{\v!naam}{#2}{#1\hskip.5em}%
+ \def\doshowpalet##1%
+ {&\color[##1]{\vrule\!!width\!!widtha\!!height\ht\strutbox\!!depth\!!zeropoint}}%
+ \processpalet[#1]\doshowpalet\crcr
+ \def\doshowpalet##1%
+ {&\gray[##1]{\vrule\!!width\!!widtha\!!height\!!zeropoint\!!depth\dp\strutbox}}%
+ \processpalet[#1]\doshowpalet\crcr
+ \doifinset{\v!waarde}{#2}
+ {\def\doshowpalet##1%
+ {&\vbox
+ {\hsize\!!widtha
+ \vskip.25ex
+ \everypar{\strut}
+ \veryraggedcenter
+ \let\colorformatseparator=\endgraf
+ \colorvalue{##1}}}%
+ \processpalet[#1]\doshowpalet}%
+ \crcr}}}
+
+\def\processpalet[#1]%
+ {\expanded{\globalprocesscommalist[\getvalue{\??pa#1}]}}
+
+%D \macros
+%D {definecolorgroup}
+%D {}
+%D
+%D The naming of the colors in this palet suggests some
+%D ordening, which in turn is suported by color grouping.
+%D
+%D \starttypen
+%D \definecolorgroup
+%D [rood]
+%D [1.00:0.90:0.90,
+%D 1.00:0.80:0.80,
+%D 1.00:0.70:0.70,
+%D 1.00:0.55:0.55,
+%D 1.00:0.40:0.40,
+%D 1.00:0.25:0.25,
+%D 1.00:0.15:0.15,
+%D 0.90:0.00:0.00]
+%D \stoptypen
+%D
+%D In such a color group colors are numbered from~$1$ to~$n$.
+%D
+%D \showsetup{\y!definecolorgroup}
+%D
+%D This kind of specification is not only more compact than
+%D defining each color separate, it also loads faster and takes
+%D less bytes.
+
+\def\definecolorgroup%
+ {\dotripleempty\dodefinecolorgroup}
+
+\def\dodefinecolorgroup[#1][#2][#3]%
+ {\ifthirdargument
+ \processaction
+ [#2]
+ [ \v!cmyk=>\edef\currentcolorspace{C},
+ \v!rgb=>\edef\currentcolorspace{R},
+ \v!gray=>\edef\currentcolorspace{S},
+ \s!unknown=>\edef\currentcolorspace{R}]%
+ \scratchcounter=0
+ \def\dododefinecolorgroup##1%
+ {\advance\scratchcounter by 1
+ \setevalue{\??cr#1:\the\scratchcounter}{\currentcolorspace:##1}}%
+ \processcommalist[#3]\dododefinecolorgroup
+ \else
+ \doifinstringelse{:}{#2}
+ {\definecolorgroup[#1][\v!rgb][#2]}
+ {\doloop
+ {\doifdefinedelse{\??cr#2:\recurselevel}
+ {\setevalue{\??cr#1:\recurselevel}%
+ {\getvalue{\??cr#2:\recurselevel}}}
+ {\exitloop}}}%
+ \fi}
+
+%D \macros
+%D {showcolorgroup}
+%D {}
+%D
+%D We can show the group by:
+%D
+%D \startbuffer
+%D \showcolorgroup [blauw] [horizontaal,naam,nummer,waarde]
+%D \stopbuffer
+%D
+%D \typebuffer
+%D
+%D or in color:
+%D
+%D \startregelcorrectie
+%D \haalbuffer
+%D \stopregelcorrectie
+%D
+%D which uses:
+%D
+%D \showsetup{\y!showcolorgroup}
+
+\def\showcolorgroup%
+ {\dodoubleargument\doshowcolorgroup}
+
+\def\doshowcolorgroup[#1][#2]%
+ {\doifdefined{\??cr#1:1}
+ {\doifinsetelse{\v!vertikaal}{#2}
+ {\showverticalcolorgroup[#1][#2]}
+ {\showhorizontalcolorgroup[#1][#2]}}}
+
+\def\showhorizontalcolorgroup[#1][#2]%
+ {\localvbox
+ {\offinterlineskip
+ \setuppalet
+ \tabskip\!!zeropoint
+ \def\rule%
+ {\vrule\!!width4em\!!height\ht\strutbox\!!depth\dp\strutbox}
+ \def\colorformatseparator{\strut\cr}
+ \def\dodoshowgroup##1%
+ {\halign
+ {\hss####\hss\cr
+ \doifinset{\v!nummer}{#2}{\strut##1}\cr
+ \color[#1:##1]{\vrule\!!width4em\!!height\ht\strutbox\!!depth\!!zeropoint}\cr
+ \gray[#1:##1]{\vrule\!!width4em\!!height\!!zeropoint\!!depth\dp\strutbox}\cr
+ \doifinset{\v!waarde}{#2}{\colorvalue{#1:##1}\strut}\crcr}}
+ \def\doshowgroup##1%
+ {\doifdefined{\??cr#1:##1}
+ {\vbox{\dodoshowgroup{##1}}}}
+ \hbox
+ {\doifinset{\v!naam}{#2}
+ {\strut
+ \doifinsetelse{\v!waarde}{#2}
+ {\raise3\lineheight\hbox{#1\hskip.5em}}
+ {#1}%
+ \hskip.5em}%
+ \doshowgroup1\doshowgroup2\doshowgroup3\doshowgroup4%
+ \doshowgroup5\doshowgroup6\doshowgroup7\doshowgroup8}}}
+
+\def\showverticalcolorgroup[#1][#2]%
+ {\localvbox
+ {\offinterlineskip
+ \setuppalet
+ \tabskip\!!zeropoint
+ \def\rule%
+ {\vrule\!!width2.5em\!!height\ht\strutbox\!!depth\dp\strutbox}
+ \def\doshowgroup##1%
+ {\doifdefined{\??cr#1:##1}
+ {\doifinset{\v!nummer}{#2}{##1\hskip.5em}&
+ \color[#1:##1]{\rule}\gray[#1:##1]{\rule}&
+ \doifinset{\v!waarde}{#2}{\hskip.5em\colorvalue{#1:##1}}\crcr}}
+ \halign
+ {\hss##&\hss##\hss&##\hss\cr
+ &\doifinset{\v!naam}{#2}{\strut#1}&\crcr
+ \doshowgroup1\doshowgroup2\doshowgroup3\doshowgroup4%
+ \doshowgroup5\doshowgroup6\doshowgroup7\doshowgroup8}}}
+
+%D There are ten predefined color groups, like
+%D \color[groen]{\em groen}, \color[rood]{\em rood},
+%D \color[blauw]{\em blauw}, \color[cyaan]{\em cyaan},
+%D \color[magenta]{\em magenta} and \color[geel]{\em geel}.
+%D
+%D \startregelcorrectie
+%D \hbox to \hsize
+%D {\hss
+%D \showcolorgroup [rood] [vertikaal,naam,nummer]\hss
+%D \showcolorgroup [groen] [vertikaal,naam]\hss
+%D \showcolorgroup [blauw] [vertikaal,naam]\hss
+%D \showcolorgroup [cyaan] [vertikaal,naam]\hss
+%D \showcolorgroup [magenta] [vertikaal,naam]\hss
+%D \showcolorgroup [geel] [vertikaal,naam]\hss}
+%D \stopregelcorrectie
+%D
+%D These groups are used to define palets {\em alfa} upto {\em
+%D zeta}. As long as we don't use colors from the same row, we
+%D get ourselves distinctive palets. By activating such a palet
+%D one gains access to its members {\em top} to {\em charm} (of
+%D course one should use more suitable names than these).
+%D
+%D \startregelcorrectie
+%D \hbox to \hsize
+%D {\showpalet [alfa] [vertikaal,naam,nummer]\hss
+%D \showpalet [beta] [vertikaal,naam]\hss
+%D \showpalet [gamma] [vertikaal,naam]\hss
+%D \showpalet [delta] [vertikaal,naam]\hss
+%D \showpalet [epsilon] [vertikaal,naam]\hss
+%D \showpalet [zeta] [vertikaal,naam]}
+%D \stopregelcorrectie
+%D
+%D By using the keyword \type{\v!waarde} the individual color
+%D components are shown too. When printed in color, these
+%D showcases show both the colors and the gray value.
+
+%D \macros
+%D {comparepalet}
+%D {}
+%D
+%D There are some more testing macros available:
+%D
+%D \startbuffer
+%D \comparepalet [alfa]
+%D \stopbuffer
+%D
+%D \typebuffer
+%D
+%D shows the palet colors against a background:
+%D
+%D \startregelcorrectie
+%D \haalbuffer
+%D \stopregelcorrectie
+%D
+%D The formal definition is:
+%D
+%D \showsetup{\y!comparepalet}
+
+\def\comparepalet%
+ {\dosingleargument\docomparepalet}
+
+\def\docomparepalet[#1]%
+ {\doifdefined{\??pa#1}
+ {\hbox
+ {\dodocomparepalet\color[#1]%
+ \quad
+ \dodocomparepalet\gray[#1]}}}
+
+\def\dodocomparepalet#1[#2]%
+ {\localvbox
+ {\offinterlineskip
+ \setuppalet[#2]
+ \getcommacommandsize[\getvalue{\??pa#2}]
+ \!!widtha=2em\relax
+ \hsize=\commalistsize\!!widtha
+ \def\rule%
+ {\vrule\!!width.5\!!widtha\!!height2.25ex\!!depth-.75ex}
+ \def\dododocomparepalet##1%
+ {\hbox
+ {\setbox0=\hbox
+ {#1[##1]{\vrule\!!width\hsize\!!height3ex}}%
+ \wd0=\!!zeropoint\box0
+ \hbox to \hsize
+ {\def\dododocomparepalet####1%
+ {\hbox to \!!widtha
+ {\hss#1[####1]{\rule}\hss}}%
+ \processcommacommand[\getvalue{\??pa#2}]\dododocomparepalet}}
+ \endgraf}
+ \processcommacommand[\getvalue{\??pa#2}]\dododocomparepalet}}
+
+%D \macros
+%D {comparecolorgroup}
+%D {}
+%D
+%D The similar command:
+%D
+%D \startbuffer
+%D \comparecolorgroup [blauw]
+%D \stopbuffer
+%D
+%D \typebuffer
+%D
+%D shows color groups:
+%D
+%D \startregelcorrectie
+%D \haalbuffer
+%D \stopregelcorrectie
+%D
+%D this commands are defined as:
+%D
+%D \showsetup{\y!comparecolorgroup}
+
+\def\comparecolorgroup%
+ {\dosingleargument\docomparecolorgroup}
+
+\def\docomparecolorgroup[#1]%
+ {\doifdefined{\??cr#1:1}
+ {\hbox
+ {\dodocomparecolorgroup\color[#1]%
+ \quad
+ \dodocomparecolorgroup\gray[#1]}}}
+
+\def\dodocomparecolorgroup#1[#2]%
+ {\localvbox
+ {\!!counta=0
+ \dorecurse{15}
+ {\doifdefined{\??cr#2:\recurselevel}{\advance\!!counta by 1}}
+ \!!widtha=2em\relax
+ \hsize=\!!counta\!!widtha
+ \def\rule%
+ {\vrule\!!width.5\!!widtha\!!height2.25ex\!!depth-.75ex}
+ \def\dododocomparecolorgroup##1%
+ {\hbox to \hsize
+ {\setbox0=\hbox
+ {#1[#2:##1]{\vrule\!!width\hsize\!!height3ex}}%
+ \wd0=\!!zeropoint\box0
+ \hbox to \hsize
+ {\hss\dorecurse{\!!counta}{#1[#2:\recurselevel]{\rule}\hss}}}
+ \endgraf}
+ \dorecurse{\!!counta}{\dododocomparecolorgroup\recurselevel}}}
+
+%D \macros
+%D {showcolor}
+%D {}
+%D
+%D But let's not forget that we also have the more traditional
+%D non||related colors. These show up after:
+%D
+%D \starttypen
+%D \showcolor [name]
+%D \stoptypen
+%D
+%D Where \type{name} for instance can be \type{rgb}.
+%D
+%D \showsetup{\y!showcolor}
+
+\def\showcolor[#1]%
+ {\bgroup
+ \setupcolor[#1]
+ \stelwitruimtein[\v!geen]
+ \def\rule%
+ {\vrule\!!width4em\!!height\ht\strutbox\!!depth\dp\strutbox}
+ \def\docommand##1%
+ {\hbox
+ {\gray[##1]{\rule}\quad
+ \color[##1]{\rule}\quad
+ \grayvalue{##1}\quad
+ \hbox to 12em{\colorvalue{##1}\hss}%
+ \strut##1}
+ \endgraf}
+ \processcommacommand[\colorlist]\docommand
+ \egroup}
+
+%D \macros
+%D {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 \starttypen
+%D \negativecolorbox0
+%D \stoptypen
+%D
+%D will negate the colors in box zero.
+
+\def\negatecolorbox#1%
+ {\setbox#1=\hbox
+ {\dostartnegative
+ \localstartcolor[white]%
+ \vrule\!!height\ht#1\!!depth\dp#1\!!width\wd#1%
+ \localstopcolor
+ \hskip-\wd#1%
+ \box#1\dostopnegative}}
+
+%D \macros
+%D {ifMPgraphics, MPcolor}
+%D
+%D A very special macro is \type{\MPcolor}. This one can be
+%D used to pass a \CONTEXT\ color to \METAPOST.
+%D
+%D \starttypen
+%D \MPcolor{my own red}
+%D \stoptypen
+%D
+%D This macro returns a \METAPOST\ triplet \type{(R,G,B)}.
+%D Only \kap{RGB} colors and gray scales are supported.
+
+\ifx\MPgraphicstrue\undefined
+ \newif\ifMPgraphics\MPgraphicstrue
+\fi
+
+\def\MPcolor#1%
+ {\ifMPgraphics
+ \@EA\@EA\@EA\doMPcolor\csname\??cr#1\endcsname::::\end
+ \else
+ #1%
+ \fi}
+
+\def\doMPcolor#1:#2:#3:#4:#5\end%
+ {\if#1R(#2,#3,#4)\else\if#2G(#2,#2,#3)\else(1,1,1)\fi\fi}
+
+%D We default to the colors defined in \module{colo-rgb} and
+%D support both \kap{RGB} and \kap{CMYK} output.
+
+\setupcolor
+ [\v!rgb]
+
+\setupcolors
+ [\c!status=\v!stop,
+ \c!conversie=\v!ja,
+ \c!reductie=\v!nee,
+ \c!rgb=\v!ja,
+ \c!cmyk=\v!ja]
+
+%D As we can see, color support is turned off by default.
+%D Reduction of gray colors to gray scales is turned on.
+
+\protect
+
+\endinput
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