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Diffstat (limited to 'src/guile/skribilo/color.scm')
| -rw-r--r-- | src/guile/skribilo/color.scm | 621 |
1 files changed, 621 insertions, 0 deletions
diff --git a/src/guile/skribilo/color.scm b/src/guile/skribilo/color.scm new file mode 100644 index 0000000..8b6205f --- /dev/null +++ b/src/guile/skribilo/color.scm @@ -0,0 +1,621 @@ +;;; color.scm -- Color management. +;;; +;;; Copyright 2003, 2004 Erick Gallesio - I3S-CNRS/ESSI <eg@essi.fr> +;;; Copyright 2006 Ludovic Courtès <ludovic.courtes@laas.fr> +;;; +;;; +;;; This program is free software; you can redistribute it and/or modify +;;; it under the terms of the GNU General Public License as published by +;;; the Free Software Foundation; either version 2 of the License, or +;;; (at your option) any later version. +;;; +;;; This program is distributed in the hope that it will be useful, +;;; but WITHOUT ANY WARRANTY; without even the implied warranty of +;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +;;; GNU General Public License for more details. +;;; +;;; You should have received a copy of the GNU General Public License +;;; along with this program; if not, write to the Free Software +;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, +;;; USA. + + +(define-module (skribilo color) + :autoload (srfi srfi-60) (bitwise-and arithmetic-shift) + :export (skribe-color->rgb skribe-get-used-colors skribe-use-color!)) + +;; FIXME: This module should be generalized and the `skribe-' procedures +;; moved to `compat.scm'. + +;; FIXME: Use a fluid? Or remove it? +(define *used-colors* '()) + +(define *skribe-rgb-alist* '( + ("snow" . "255 250 250") + ("ghostwhite" . "248 248 255") + ("whitesmoke" . "245 245 245") + ("gainsboro" . "220 220 220") + ("floralwhite" . "255 250 240") + ("oldlace" . "253 245 230") + ("linen" . "250 240 230") + ("antiquewhite" . "250 235 215") + ("papayawhip" . "255 239 213") + ("blanchedalmond" . "255 235 205") + ("bisque" . "255 228 196") + ("peachpuff" . "255 218 185") + ("navajowhite" . "255 222 173") + ("moccasin" . "255 228 181") + ("cornsilk" . "255 248 220") + ("ivory" . "255 255 240") + ("lemonchiffon" . "255 250 205") + ("seashell" . "255 245 238") + ("honeydew" . "240 255 240") + ("mintcream" . "245 255 250") + ("azure" . "240 255 255") + ("aliceblue" . "240 248 255") + ("lavender" . "230 230 250") + ("lavenderblush" . "255 240 245") + ("mistyrose" . "255 228 225") + ("white" . "255 255 255") + ("black" . "0 0 0") + ("darkslategrey" . "47 79 79") + ("dimgrey" . "105 105 105") + ("slategrey" . "112 128 144") + ("lightslategrey" . "119 136 153") + ("grey" . "190 190 190") + ("lightgrey" . "211 211 211") + ("midnightblue" . "25 25 112") + ("navy" . "0 0 128") + ("navyblue" . "0 0 128") + ("cornflowerblue" . "100 149 237") + ("darkslateblue" . "72 61 139") + ("slateblue" . "106 90 205") + ("mediumslateblue" . "123 104 238") + ("lightslateblue" . "132 112 255") + ("mediumblue" . "0 0 205") + ("royalblue" . "65 105 225") + ("blue" . "0 0 255") + ("dodgerblue" . "30 144 255") + ("deepskyblue" . "0 191 255") + ("skyblue" . "135 206 235") + ("lightskyblue" . "135 206 250") + ("steelblue" . "70 130 180") + ("lightsteelblue" . "176 196 222") + ("lightblue" . "173 216 230") + ("powderblue" . "176 224 230") + ("paleturquoise" . "175 238 238") + ("darkturquoise" . "0 206 209") + ("mediumturquoise" . "72 209 204") + ("turquoise" . "64 224 208") + ("cyan" . "0 255 255") + ("lightcyan" . "224 255 255") + ("cadetblue" . "95 158 160") + ("mediumaquamarine" . "102 205 170") + ("aquamarine" . "127 255 212") + ("darkgreen" . "0 100 0") + ("darkolivegreen" . "85 107 47") + ("darkseagreen" . "143 188 143") + ("seagreen" . "46 139 87") + ("mediumseagreen" . "60 179 113") + ("lightseagreen" . "32 178 170") + ("palegreen" . "152 251 152") + ("springgreen" . "0 255 127") + ("lawngreen" . "124 252 0") + ("green" . "0 255 0") + ("chartreuse" . "127 255 0") + ("mediumspringgreen" . "0 250 154") + ("greenyellow" . "173 255 47") + ("limegreen" . "50 205 50") + ("yellowgreen" . "154 205 50") + ("forestgreen" . "34 139 34") + ("olivedrab" . "107 142 35") + ("darkkhaki" . "189 183 107") + ("khaki" . "240 230 140") + ("palegoldenrod" . "238 232 170") + ("lightgoldenrodyellow" . "250 250 210") + ("lightyellow" . "255 255 224") + ("yellow" . "255 255 0") + ("gold" . "255 215 0") + ("lightgoldenrod" . "238 221 130") + ("goldenrod" . "218 165 32") + ("darkgoldenrod" . "184 134 11") + ("rosybrown" . "188 143 143") + ("indianred" . "205 92 92") + ("saddlebrown" . "139 69 19") + ("sienna" . "160 82 45") + ("peru" . "205 133 63") + ("burlywood" . "222 184 135") + ("beige" . "245 245 220") + ("wheat" . "245 222 179") + ("sandybrown" . "244 164 96") + ("tan" . "210 180 140") + ("chocolate" . "210 105 30") + ("firebrick" . "178 34 34") + ("brown" . "165 42 42") + ("darksalmon" . "233 150 122") + ("salmon" . "250 128 114") + ("lightsalmon" . "255 160 122") + ("orange" . "255 165 0") + ("darkorange" . "255 140 0") + ("coral" . "255 127 80") + ("lightcoral" . "240 128 128") + ("tomato" . "255 99 71") + ("orangered" . "255 69 0") + ("red" . "255 0 0") + ("hotpink" . "255 105 180") + ("deeppink" . "255 20 147") + ("pink" . "255 192 203") + ("lightpink" . "255 182 193") + ("palevioletred" . "219 112 147") + ("maroon" . "176 48 96") + ("mediumvioletred" . "199 21 133") + ("violetred" . "208 32 144") + ("magenta" . "255 0 255") + ("violet" . "238 130 238") + ("plum" . "221 160 221") + ("orchid" . "218 112 214") + ("mediumorchid" . "186 85 211") + ("darkorchid" . "153 50 204") + ("darkviolet" . "148 0 211") + ("blueviolet" . "138 43 226") + ("purple" . "160 32 240") + ("mediumpurple" . "147 112 219") + ("thistle" . "216 191 216") + ("snow1" . "255 250 250") + ("snow2" . "238 233 233") + ("snow3" . "205 201 201") + ("snow4" . "139 137 137") + ("seashell1" . "255 245 238") + ("seashell2" . "238 229 222") + ("seashell3" . "205 197 191") + ("seashell4" . "139 134 130") + ("antiquewhite1" . "255 239 219") + ("antiquewhite2" . "238 223 204") + ("antiquewhite3" . "205 192 176") + ("antiquewhite4" . "139 131 120") + ("bisque1" . "255 228 196") + ("bisque2" . "238 213 183") + ("bisque3" . "205 183 158") + ("bisque4" . "139 125 107") + ("peachpuff1" . "255 218 185") + ("peachpuff2" . "238 203 173") + ("peachpuff3" . "205 175 149") + ("peachpuff4" . "139 119 101") + ("navajowhite1" . "255 222 173") + ("navajowhite2" . "238 207 161") + ("navajowhite3" . "205 179 139") + ("navajowhite4" . "139 121 94") + ("lemonchiffon1" . "255 250 205") + ("lemonchiffon2" . "238 233 191") + ("lemonchiffon3" . "205 201 165") + ("lemonchiffon4" . "139 137 112") + ("cornsilk1" . "255 248 220") + ("cornsilk2" . "238 232 205") + ("cornsilk3" . "205 200 177") + ("cornsilk4" . "139 136 120") + ("ivory1" . "255 255 240") + ("ivory2" . "238 238 224") + ("ivory3" . "205 205 193") + ("ivory4" . "139 139 131") + ("honeydew1" . "240 255 240") + ("honeydew2" . "224 238 224") + ("honeydew3" . "193 205 193") + ("honeydew4" . "131 139 131") + ("lavenderblush1" . "255 240 245") + ("lavenderblush2" . "238 224 229") + ("lavenderblush3" . "205 193 197") + ("lavenderblush4" . "139 131 134") + ("mistyrose1" . "255 228 225") + ("mistyrose2" . "238 213 210") + ("mistyrose3" . "205 183 181") + ("mistyrose4" . "139 125 123") + ("azure1" . "240 255 255") + ("azure2" . "224 238 238") + ("azure3" . "193 205 205") + ("azure4" . "131 139 139") + ("slateblue1" . "131 111 255") + ("slateblue2" . "122 103 238") + ("slateblue3" . "105 89 205") + ("slateblue4" . "71 60 139") + ("royalblue1" . "72 118 255") + ("royalblue2" . "67 110 238") + ("royalblue3" . "58 95 205") + ("royalblue4" . "39 64 139") + ("blue1" . "0 0 255") + ("blue2" . "0 0 238") + ("blue3" . "0 0 205") + ("blue4" . "0 0 139") + ("dodgerblue1" . "30 144 255") + ("dodgerblue2" . "28 134 238") + ("dodgerblue3" . "24 116 205") + ("dodgerblue4" . "16 78 139") + ("steelblue1" . "99 184 255") + ("steelblue2" . "92 172 238") + ("steelblue3" . "79 148 205") + ("steelblue4" . "54 100 139") + ("deepskyblue1" . "0 191 255") + ("deepskyblue2" . "0 178 238") + ("deepskyblue3" . "0 154 205") + ("deepskyblue4" . "0 104 139") + ("skyblue1" . "135 206 255") + ("skyblue2" . "126 192 238") + ("skyblue3" . "108 166 205") + ("skyblue4" . "74 112 139") + ("lightskyblue1" . "176 226 255") + ("lightskyblue2" . "164 211 238") + ("lightskyblue3" . "141 182 205") + ("lightskyblue4" . "96 123 139") + ("lightsteelblue1" . "202 225 255") + ("lightsteelblue2" . "188 210 238") + ("lightsteelblue3" . "162 181 205") + ("lightsteelblue4" . "110 123 139") + ("lightblue1" . "191 239 255") + ("lightblue2" . "178 223 238") + ("lightblue3" . "154 192 205") + ("lightblue4" . "104 131 139") + ("lightcyan1" . "224 255 255") + ("lightcyan2" . "209 238 238") + ("lightcyan3" . "180 205 205") + ("lightcyan4" . "122 139 139") + ("paleturquoise1" . "187 255 255") + ("paleturquoise2" . "174 238 238") + ("paleturquoise3" . "150 205 205") + ("paleturquoise4" . "102 139 139") + ("cadetblue1" . "152 245 255") + ("cadetblue2" . "142 229 238") + ("cadetblue3" . "122 197 205") + ("cadetblue4" . "83 134 139") + ("turquoise1" . "0 245 255") + ("turquoise2" . "0 229 238") + ("turquoise3" . "0 197 205") + ("turquoise4" . "0 134 139") + ("cyan1" . "0 255 255") + ("cyan2" . "0 238 238") + ("cyan3" . "0 205 205") + ("cyan4" . "0 139 139") + ("aquamarine1" . "127 255 212") + ("aquamarine2" . "118 238 198") + ("aquamarine3" . "102 205 170") + ("aquamarine4" . "69 139 116") + ("darkseagreen1" . "193 255 193") + ("darkseagreen2" . "180 238 180") + ("darkseagreen3" . "155 205 155") + ("darkseagreen4" . "105 139 105") + ("seagreen1" . "84 255 159") + ("seagreen2" . "78 238 148") + ("seagreen3" . "67 205 128") + ("seagreen4" . "46 139 87") + ("palegreen1" . "154 255 154") + ("palegreen2" . "144 238 144") + ("palegreen3" . "124 205 124") + ("palegreen4" . "84 139 84") + ("springgreen1" . "0 255 127") + ("springgreen2" . "0 238 118") + ("springgreen3" . "0 205 102") + ("springgreen4" . "0 139 69") + ("green1" . "0 255 0") + ("green2" . "0 238 0") + ("green3" . "0 205 0") + ("green4" . "0 139 0") + ("chartreuse1" . "127 255 0") + ("chartreuse2" . "118 238 0") + ("chartreuse3" . "102 205 0") + ("chartreuse4" . "69 139 0") + ("olivedrab1" . "192 255 62") + ("olivedrab2" . "179 238 58") + ("olivedrab3" . "154 205 50") + ("olivedrab4" . "105 139 34") + ("darkolivegreen1" . "202 255 112") + ("darkolivegreen2" . "188 238 104") + ("darkolivegreen3" . "162 205 90") + ("darkolivegreen4" . "110 139 61") + ("khaki1" . "255 246 143") + ("khaki2" . "238 230 133") + ("khaki3" . "205 198 115") + ("khaki4" . "139 134 78") + ("lightgoldenrod1" . "255 236 139") + ("lightgoldenrod2" . "238 220 130") + ("lightgoldenrod3" . "205 190 112") + ("lightgoldenrod4" . "139 129 76") + ("lightyellow1" . "255 255 224") + ("lightyellow2" . "238 238 209") + ("lightyellow3" . "205 205 180") + ("lightyellow4" . "139 139 122") + ("yellow1" . "255 255 0") + ("yellow2" . "238 238 0") + ("yellow3" . "205 205 0") + ("yellow4" . "139 139 0") + ("gold1" . "255 215 0") + ("gold2" . "238 201 0") + ("gold3" . "205 173 0") + ("gold4" . "139 117 0") + ("goldenrod1" . "255 193 37") + ("goldenrod2" . "238 180 34") + ("goldenrod3" . "205 155 29") + ("goldenrod4" . "139 105 20") + ("darkgoldenrod1" . "255 185 15") + ("darkgoldenrod2" . "238 173 14") + ("darkgoldenrod3" . "205 149 12") + ("darkgoldenrod4" . "139 101 8") + ("rosybrown1" . "255 193 193") + ("rosybrown2" . "238 180 180") + ("rosybrown3" . "205 155 155") + ("rosybrown4" . "139 105 105") + ("indianred1" . "255 106 106") + ("indianred2" . "238 99 99") + ("indianred3" . "205 85 85") + ("indianred4" . "139 58 58") + ("sienna1" . "255 130 71") + ("sienna2" . "238 121 66") + ("sienna3" . "205 104 57") + ("sienna4" . "139 71 38") + ("burlywood1" . "255 211 155") + ("burlywood2" . "238 197 145") + ("burlywood3" . "205 170 125") + ("burlywood4" . "139 115 85") + ("wheat1" . "255 231 186") + ("wheat2" . "238 216 174") + ("wheat3" . "205 186 150") + ("wheat4" . "139 126 102") + ("tan1" . "255 165 79") + ("tan2" . "238 154 73") + ("tan3" . "205 133 63") + ("tan4" . "139 90 43") + ("chocolate1" . "255 127 36") + ("chocolate2" . "238 118 33") + ("chocolate3" . "205 102 29") + ("chocolate4" . "139 69 19") + ("firebrick1" . "255 48 48") + ("firebrick2" . "238 44 44") + ("firebrick3" . "205 38 38") + ("firebrick4" . "139 26 26") + ("brown1" . "255 64 64") + ("brown2" . "238 59 59") + ("brown3" . "205 51 51") + ("brown4" . "139 35 35") + ("salmon1" . "255 140 105") + ("salmon2" . "238 130 98") + ("salmon3" . "205 112 84") + ("salmon4" . "139 76 57") + ("lightsalmon1" . "255 160 122") + ("lightsalmon2" . "238 149 114") + ("lightsalmon3" . "205 129 98") + ("lightsalmon4" . "139 87 66") + ("orange1" . "255 165 0") + ("orange2" . "238 154 0") + ("orange3" . "205 133 0") + ("orange4" . "139 90 0") + ("darkorange1" . "255 127 0") + ("darkorange2" . "238 118 0") + ("darkorange3" . "205 102 0") + ("darkorange4" . "139 69 0") + ("coral1" . "255 114 86") + ("coral2" . "238 106 80") + ("coral3" . "205 91 69") + ("coral4" . "139 62 47") + ("tomato1" . "255 99 71") + ("tomato2" . "238 92 66") + ("tomato3" . "205 79 57") + ("tomato4" . "139 54 38") + ("orangered1" . "255 69 0") + ("orangered2" . "238 64 0") + ("orangered3" . "205 55 0") + ("orangered4" . "139 37 0") + ("red1" . "255 0 0") + ("red2" . "238 0 0") + ("red3" . "205 0 0") + ("red4" . "139 0 0") + ("deeppink1" . "255 20 147") + ("deeppink2" . "238 18 137") + ("deeppink3" . "205 16 118") + ("deeppink4" . "139 10 80") + ("hotpink1" . "255 110 180") + ("hotpink2" . "238 106 167") + ("hotpink3" . "205 96 144") + ("hotpink4" . "139 58 98") + ("pink1" . "255 181 197") + ("pink2" . "238 169 184") + ("pink3" . "205 145 158") + ("pink4" . "139 99 108") + ("lightpink1" . "255 174 185") + ("lightpink2" . "238 162 173") + ("lightpink3" . "205 140 149") + ("lightpink4" . "139 95 101") + ("palevioletred1" . "255 130 171") + ("palevioletred2" . "238 121 159") + ("palevioletred3" . "205 104 137") + ("palevioletred4" . "139 71 93") + ("maroon1" . "255 52 179") + ("maroon2" . "238 48 167") + ("maroon3" . "205 41 144") + ("maroon4" . "139 28 98") + ("violetred1" . "255 62 150") + ("violetred2" . "238 58 140") + ("violetred3" . "205 50 120") + ("violetred4" . "139 34 82") + ("magenta1" . "255 0 255") + ("magenta2" . "238 0 238") + ("magenta3" . "205 0 205") + ("magenta4" . "139 0 139") + ("orchid1" . "255 131 250") + ("orchid2" . "238 122 233") + ("orchid3" . "205 105 201") + ("orchid4" . "139 71 137") + ("plum1" . "255 187 255") + ("plum2" . "238 174 238") + ("plum3" . "205 150 205") + ("plum4" . "139 102 139") + ("mediumorchid1" . "224 102 255") + ("mediumorchid2" . "209 95 238") + ("mediumorchid3" . "180 82 205") + ("mediumorchid4" . "122 55 139") + ("darkorchid1" . "191 62 255") + ("darkorchid2" . "178 58 238") + ("darkorchid3" . "154 50 205") + ("darkorchid4" . "104 34 139") + ("purple1" . "155 48 255") + ("purple2" . "145 44 238") + ("purple3" . "125 38 205") + ("purple4" . "85 26 139") + ("mediumpurple1" . "171 130 255") + ("mediumpurple2" . "159 121 238") + ("mediumpurple3" . "137 104 205") + ("mediumpurple4" . "93 71 139") + ("thistle1" . "255 225 255") + ("thistle2" . "238 210 238") + ("thistle3" . "205 181 205") + ("thistle4" . "139 123 139") + ("grey0" . "0 0 0") + ("grey1" . "3 3 3") + ("grey2" . "5 5 5") + ("grey3" . "8 8 8") + ("grey4" . "10 10 10") + ("grey5" . "13 13 13") + ("grey6" . "15 15 15") + ("grey7" . "18 18 18") + ("grey8" . "20 20 20") + ("grey9" . "23 23 23") + ("grey10" . "26 26 26") + ("grey11" . "28 28 28") + ("grey12" . "31 31 31") + ("grey13" . "33 33 33") + ("grey14" . "36 36 36") + ("grey15" . "38 38 38") + ("grey16" . "41 41 41") + ("grey17" . "43 43 43") + ("grey18" . "46 46 46") + ("grey19" . "48 48 48") + ("grey20" . "51 51 51") + ("grey21" . "54 54 54") + ("grey22" . "56 56 56") + ("grey23" . "59 59 59") + ("grey24" . "61 61 61") + ("grey25" . "64 64 64") + ("grey26" . "66 66 66") + ("grey27" . "69 69 69") + ("grey28" . "71 71 71") + ("grey29" . "74 74 74") + ("grey30" . "77 77 77") + ("grey31" . "79 79 79") + ("grey32" . "82 82 82") + ("grey33" . "84 84 84") + ("grey34" . "87 87 87") + ("grey35" . "89 89 89") + ("grey36" . "92 92 92") + ("grey37" . "94 94 94") + ("grey38" . "97 97 97") + ("grey39" . "99 99 99") + ("grey40" . "102 102 102") + ("grey41" . "105 105 105") + ("grey42" . "107 107 107") + ("grey43" . "110 110 110") + ("grey44" . "112 112 112") + ("grey45" . "115 115 115") + ("grey46" . "117 117 117") + ("grey47" . "120 120 120") + ("grey48" . "122 122 122") + ("grey49" . "125 125 125") + ("grey50" . "127 127 127") + ("grey51" . "130 130 130") + ("grey52" . "133 133 133") + ("grey53" . "135 135 135") + ("grey54" . "138 138 138") + ("grey55" . "140 140 140") + ("grey56" . "143 143 143") + ("grey57" . "145 145 145") + ("grey58" . "148 148 148") + ("grey59" . "150 150 150") + ("grey60" . "153 153 153") + ("grey61" . "156 156 156") + ("grey62" . "158 158 158") + ("grey63" . "161 161 161") + ("grey64" . "163 163 163") + ("grey65" . "166 166 166") + ("grey66" . "168 168 168") + ("grey67" . "171 171 171") + ("grey68" . "173 173 173") + ("grey69" . "176 176 176") + ("grey70" . "179 179 179") + ("grey71" . "181 181 181") + ("grey72" . "184 184 184") + ("grey73" . "186 186 186") + ("grey74" . "189 189 189") + ("grey75" . "191 191 191") + ("grey76" . "194 194 194") + ("grey77" . "196 196 196") + ("grey78" . "199 199 199") + ("grey79" . "201 201 201") + ("grey80" . "204 204 204") + ("grey81" . "207 207 207") + ("grey82" . "209 209 209") + ("grey83" . "212 212 212") + ("grey84" . "214 214 214") + ("grey85" . "217 217 217") + ("grey86" . "219 219 219") + ("grey87" . "222 222 222") + ("grey88" . "224 224 224") + ("grey89" . "227 227 227") + ("grey90" . "229 229 229") + ("grey91" . "232 232 232") + ("grey92" . "235 235 235") + ("grey93" . "237 237 237") + ("grey94" . "240 240 240") + ("grey95" . "242 242 242") + ("grey96" . "245 245 245") + ("grey97" . "247 247 247") + ("grey98" . "250 250 250") + ("grey99" . "252 252 252") + ("grey100" . "255 255 255") + ("darkgrey" . "169 169 169") + ("darkblue" . "0 0 139") + ("darkcyan" . "0 139 139") + ("darkmagenta" . "139 0 139") + ("darkred" . "139 0 0") + ("lightgreen" . "144 238 144"))) + + +(define (%convert-color str) + (let ((col (assoc str *skribe-rgb-alist*))) + (cond + (col + (let* ((p (open-input-string (cdr col))) + (r (read p)) + (g (read p)) + (b (read p))) + (values r g b))) + ((and (string? str) (eq? (string-ref str 0) #\#) (= (string-length str) 7)) + (values (string->number (substring str 1 3) 16) + (string->number (substring str 3 5) 16) + (string->number (substring str 5 7) 16))) + ((and (string? str) (eq? (string-ref str 0) #\#) (= (string-length str) 13)) + (values (string->number (substring str 1 5) 16) + (string->number (substring str 5 9) 16) + (string->number (substring str 9 13) 16))) + (else + (values 0 0 0))))) + +;;; +;;; SKRIBE-COLOR->RGB +;;; +(define (skribe-color->rgb spec) + (cond + ((string? spec) (%convert-color spec)) + ((integer? spec) + (values (bitwise-and #xff (arithmetic-shift spec -16)) + (bitwise-and #xff (arithmetic-shift spec -8)) + (bitwise-and #xff spec))) + (else + (values 0 0 0)))) + +;;; +;;; SKRIBE-GET-USED-COLORS +;;; +(define (skribe-get-used-colors) + *used-colors*) + +;;; +;;; SKRIBE-USE-COLOR! +;;; +(define (skribe-use-color! color) + (set! *used-colors* (cons color *used-colors*)) + color) |