pyx/color.py

   1 #!/usr/bin/env python
   2 # -*- coding: ISO-8859-1 -*-
   3 #
   4 #
   5 # Copyright (C) 2002 Jörg Lehmann <joergl@users.sourceforge.net>
   6 # Copyright (C) 2002 André Wobst <wobsta@users.sourceforge.net>
   7 #
   8 # This file is part of PyX (http://pyx.sourceforge.net/).
   9 #
  10 # PyX is free software; you can redistribute it and/or modify
  11 # it under the terms of the GNU General Public License as published by
  12 # the Free Software Foundation; either version 2 of the License, or
  13 # (at your option) any later version.
  14 #
  15 # PyX is distributed in the hope that it will be useful,
  16 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 # GNU General Public License for more details.
  19 #
  20 # You should have received a copy of the GNU General Public License
  21 # along with PyX; if not, write to the Free Software
  22 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23
  24 import attr, style
  25
  26 class color(attr.exclusiveattr, style.strokestyle, style.fillstyle):
  27
  28     """base class for all colors"""
  29
  30     def __init__(self):
  31         attr.exclusiveattr.__init__(self, color)
  32
  33
  34 clear = attr.clearclass(color)
  35
  36
  37 class grey(color):
  38
  39     """grey tones"""
  40
  41     def __init__(self, gray):
  42         color.__init__(self)
  43         if gray<0 or gray>1: raise ValueError
  44         self.color = {"gray": gray}
  45
  46     def write(self, file):
  47         file.write("%(gray)f setgray\n" % self.color)
  48
  49 grey.black = grey(0.0)
  50 grey.white = grey(1.0)
  51 gray = grey
  52
  53
  54 class rgb(color):
  55
  56     """rgb colors"""
  57
  58     def __init__(self, r=0.0, g=0.0, b=0.0):
  59         color.__init__(self)
  60         if r<0 or r>1 or g<0 or g>1 or b<0 or b>1: raise ValueError
  61         self.color = {"r": r, "g": g, "b": b}
  62
  63     def write(self, file):
  64         file.write("%(r)f %(g)f %(b)f setrgbcolor\n" % self.color)
  65
  66 rgb.red   = rgb(1,0,0)
  67 rgb.green = rgb(0,1,0)
  68 rgb.blue  = rgb(0,0,1)
  69 rgb.white = rgb(1,1,1)
  70 rgb.black = rgb(0,0,0)
  71
  72
  73 class hsb(color):
  74
  75     """hsb colors"""
  76
  77     def __init__(self, h=0.0, s=0.0, b=0.0):
  78         color.__init__(self)
  79         if h<0 or h>1 or s<0 or s>1 or b<0 or b>1: raise ValueError
  80         self.color = {"h": h, "s": s, "b": b}
  81
  82     def write(self, file):
  83         file.write("%(h)f %(s)f %(b)f sethsbcolor\n" % self.color)
  84
  85
  86 class cmyk(color):
  87
  88     """cmyk colors"""
  89
  90     def __init__(self, c=0.0, m=0.0, y=0.0, k=0.0):
  91         color.__init__(self)
  92         if c<0 or c>1 or m<0 or m>1 or y<0 or y>1 or k<0 or k>1: raise ValueError
  93         self.color = {"c": c, "m": m, "y": y, "k": k}
  94
  95     def write(self, file):
  96         file.write("%(c)f %(m)f %(y)f %(k)f setcmykcolor\n" % self.color)
  97
  98
  99 cmyk.GreenYellow    = cmyk(0.15, 0, 0.69, 0)
 100 cmyk.Yellow         = cmyk(0, 0, 1, 0)
 101 cmyk.Goldenrod      = cmyk(0, 0.10, 0.84, 0)
 102 cmyk.Dandelion      = cmyk(0, 0.29, 0.84, 0)
 103 cmyk.Apricot        = cmyk(0, 0.32, 0.52, 0)
 104 cmyk.Peach          = cmyk(0, 0.50, 0.70, 0)
 105 cmyk.Melon          = cmyk(0, 0.46, 0.50, 0)
 106 cmyk.YellowOrange   = cmyk(0, 0.42, 1, 0)
 107 cmyk.Orange         = cmyk(0, 0.61, 0.87, 0)
 108 cmyk.BurntOrange    = cmyk(0, 0.51, 1, 0)
 109 cmyk.Bittersweet    = cmyk(0, 0.75, 1, 0.24)
 110 cmyk.RedOrange      = cmyk(0, 0.77, 0.87, 0)
 111 cmyk.Mahogany       = cmyk(0, 0.85, 0.87, 0.35)
 112 cmyk.Maroon         = cmyk(0, 0.87, 0.68, 0.32)
 113 cmyk.BrickRed       = cmyk(0, 0.89, 0.94, 0.28)
 114 cmyk.Red            = cmyk(0, 1, 1, 0)
 115 cmyk.OrangeRed      = cmyk(0, 1, 0.50, 0)
 116 cmyk.RubineRed      = cmyk(0, 1, 0.13, 0)
 117 cmyk.WildStrawberry = cmyk(0, 0.96, 0.39, 0)
 118 cmyk.Salmon         = cmyk(0, 0.53, 0.38, 0)
 119 cmyk.CarnationPink  = cmyk(0, 0.63, 0, 0)
 120 cmyk.Magenta        = cmyk(0, 1, 0, 0)
 121 cmyk.VioletRed      = cmyk(0, 0.81, 0, 0)
 122 cmyk.Rhodamine      = cmyk(0, 0.82, 0, 0)
 123 cmyk.Mulberry       = cmyk(0.34, 0.90, 0, 0.02)
 124 cmyk.RedViolet      = cmyk(0.07, 0.90, 0, 0.34)
 125 cmyk.Fuchsia        = cmyk(0.47, 0.91, 0, 0.08)
 126 cmyk.Lavender       = cmyk(0, 0.48, 0, 0)
 127 cmyk.Thistle        = cmyk(0.12, 0.59, 0, 0)
 128 cmyk.Orchid         = cmyk(0.32, 0.64, 0, 0)
 129 cmyk.DarkOrchid     = cmyk(0.40, 0.80, 0.20, 0)
 130 cmyk.Purple         = cmyk(0.45, 0.86, 0, 0)
 131 cmyk.Plum           = cmyk(0.50, 1, 0, 0)
 132 cmyk.Violet         = cmyk(0.79, 0.88, 0, 0)
 133 cmyk.RoyalPurple    = cmyk(0.75, 0.90, 0, 0)
 134 cmyk.BlueViolet     = cmyk(0.86, 0.91, 0, 0.04)
 135 cmyk.Periwinkle     = cmyk(0.57, 0.55, 0, 0)
 136 cmyk.CadetBlue      = cmyk(0.62, 0.57, 0.23, 0)
 137 cmyk.CornflowerBlue = cmyk(0.65, 0.13, 0, 0)
 138 cmyk.MidnightBlue   = cmyk(0.98, 0.13, 0, 0.43)
 139 cmyk.NavyBlue       = cmyk(0.94, 0.54, 0, 0)
 140 cmyk.RoyalBlue      = cmyk(1, 0.50, 0, 0)
 141 cmyk.Blue           = cmyk(1, 1, 0, 0)
 142 cmyk.Cerulean       = cmyk(0.94, 0.11, 0, 0)
 143 cmyk.Cyan           = cmyk(1, 0, 0, 0)
 144 cmyk.ProcessBlue    = cmyk(0.96, 0, 0, 0)
 145 cmyk.SkyBlue        = cmyk(0.62, 0, 0.12, 0)
 146 cmyk.Turquoise      = cmyk(0.85, 0, 0.20, 0)
 147 cmyk.TealBlue       = cmyk(0.86, 0, 0.34, 0.02)
 148 cmyk.Aquamarine     = cmyk(0.82, 0, 0.30, 0)
 149 cmyk.BlueGreen      = cmyk(0.85, 0, 0.33, 0)
 150 cmyk.Emerald        = cmyk(1, 0, 0.50, 0)
 151 cmyk.JungleGreen    = cmyk(0.99, 0, 0.52, 0)
 152 cmyk.SeaGreen       = cmyk(0.69, 0, 0.50, 0)
 153 cmyk.Green          = cmyk(1, 0, 1, 0)
 154 cmyk.ForestGreen    = cmyk(0.91, 0, 0.88, 0.12)
 155 cmyk.PineGreen      = cmyk(0.92, 0, 0.59, 0.25)
 156 cmyk.LimeGreen      = cmyk(0.50, 0, 1, 0)
 157 cmyk.YellowGreen    = cmyk(0.44, 0, 0.74, 0)
 158 cmyk.SpringGreen    = cmyk(0.26, 0, 0.76, 0)
 159 cmyk.OliveGreen     = cmyk(0.64, 0, 0.95, 0.40)
 160 cmyk.RawSienna      = cmyk(0, 0.72, 1, 0.45)
 161 cmyk.Sepia          = cmyk(0, 0.83, 1, 0.70)
 162 cmyk.Brown          = cmyk(0, 0.81, 1, 0.60)
 163 cmyk.Tan            = cmyk(0.14, 0.42, 0.56, 0)
 164 cmyk.Gray           = cmyk(0, 0, 0, 0.50)
 165 cmyk.Grey           = cmyk.Gray
 166 cmyk.Black          = cmyk(0, 0, 0, 1)
 167 cmyk.White          = cmyk(0, 0, 0, 0)
 168 cmyk.white          = cmyk.White
 169 cmyk.black          = cmyk.Black
 170
 171
 172 # TODO: - a palette is not a style (as it is not an PSOp)
 173 #       - should we have a changeable attribute instead
 174 #         those may define a method get etc.
 175
 176 class palette:
 177
 178     """palette is a collection of two colors for calculating transitions between them"""
 179
 180     def __init__(self, mincolor, maxcolor, min=0, max=1):
 181         if mincolor.__class__ != maxcolor.__class__:
 182             raise ValueError
 183         self.colorclass = mincolor.__class__
 184         self.mincolor = mincolor
 185         self.maxcolor = maxcolor
 186         self.min = min
 187         self.max = max
 188
 189     def getcolor(self, index):
 190         color = {}
 191         for key in self.mincolor.color.keys():
 192             color[key] = ((index - self.min) * self.maxcolor.color[key] +
 193                           (self.max - index) * self.mincolor.color[key]) / float(self.max - self.min)
 194         return self.colorclass(**color)
 195
 196 #palette.clear = attr._classclear(palette)
 197
 198 palette.Gray           = palette(gray.white, gray.black)
 199 palette.Grey           = palette.Gray
 200 palette.ReverseGray    = palette(gray.black, gray.white)
 201 palette.ReverseGrey    = palette.ReverseGray
 202 palette.RedGreen       = palette(rgb.red, rgb.green)
 203 palette.RedBlue        = palette(rgb.red, rgb.blue)
 204 palette.GreenRed       = palette(rgb.green, rgb.red)
 205 palette.GreenBlue      = palette(rgb.green, rgb.blue)
 206 palette.BlueRed        = palette(rgb.blue, rgb.red)
 207 palette.BlueGreen      = palette(rgb.blue, rgb.green)
 208 palette.RedBlack       = palette(rgb.red, rgb.black)
 209 palette.BlackRed       = palette(rgb.black, rgb.red)
 210 palette.RedWhite       = palette(rgb.red, rgb.white)
 211 palette.WhiteRed       = palette(rgb.white, rgb.red)
 212 palette.GreenBlack     = palette(rgb.green, rgb.black)
 213 palette.BlackGreen     = palette(rgb.black, rgb.green)
 214 palette.GreenWhite     = palette(rgb.green, rgb.white)
 215 palette.WhiteGreen     = palette(rgb.white, rgb.green)
 216 palette.BlueBlack      = palette(rgb.blue, rgb.black)
 217 palette.BlackBlue      = palette(rgb.black, rgb.blue)
 218 palette.BlueWhite      = palette(rgb.blue, rgb.white)
 219 palette.WhiteBlue      = palette(rgb.white, rgb.blue)
 220 palette.Rainbow        = palette(hsb(0, 1, 1), hsb(2.0/3.0, 1, 1))
 221 palette.ReverseRainbow = palette(hsb(2.0/3.0, 1, 1), hsb(0, 1, 1))
 222 palette.Hue            = palette(hsb(0, 1, 1), hsb(1, 1, 1))
 223 palette.ReverseHue     = palette(hsb(1, 1, 1), hsb(0, 1, 1))
 224