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colors.go
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package mdtopdf
import (
"math"
"strconv"
"strings"
)
// The functions below were taken almost as is from https://github.com/ajstarks/deck/blob/master/cmd/pdfdeck/colors.go
// colornames maps SVG color names to RGB triples.
var colornames = map[string]Color{
"aliceblue": {240, 248, 255},
"antiquewhite": {250, 235, 215},
"aqua": {0, 255, 255},
"aquamarine": {127, 255, 212},
"azure": {240, 255, 255},
"beige": {245, 245, 220},
"bisque": {255, 228, 196},
"black": {0, 0, 0},
"charlestongreen": {35, 43, 43},
"eerieblack": {27, 27, 27},
"jetblack": {52, 52, 52},
"blanchedalmond": {255, 235, 205},
"blue": {0, 0, 255},
"blueviolet": {138, 43, 226},
"brown": {165, 42, 42},
"burlywood": {222, 184, 135},
"cadetblue": {95, 158, 160},
"chartreuse": {127, 255, 0},
"chocolate": {210, 105, 30},
"coral": {255, 127, 80},
"cornflowerblue": {100, 149, 237},
"cornsilk": {255, 248, 220},
"crimson": {220, 20, 60},
"cyan": {0, 255, 255},
"darkblue": {0, 0, 139},
"darkcyan": {0, 139, 139},
"darkgoldenrod": {184, 134, 11},
"darkgray": {169, 169, 169},
"darkgreen": {0, 100, 0},
"darkgrey": {169, 169, 169},
"darkkhaki": {189, 183, 107},
"darkmagenta": {139, 0, 139},
"darkolivegreen": {85, 107, 47},
"darkorange": {255, 140, 0},
"darkorchid": {153, 50, 204},
"darkred": {139, 0, 0},
"darksalmon": {233, 150, 122},
"darkseagreen": {143, 188, 143},
"darkslateblue": {72, 61, 139},
"darkslategray": {47, 79, 79},
"darkslategrey": {47, 79, 79},
"darkturquoise": {0, 206, 209},
"darkviolet": {148, 0, 211},
"deeppink": {255, 20, 147},
"deepskyblue": {0, 191, 255},
"dimgray": {105, 105, 105},
"dimgrey": {105, 105, 105},
"dodgerblue": {30, 144, 255},
"firebrick": {178, 34, 34},
"floralwhite": {255, 250, 240},
"forestgreen": {34, 139, 34},
"fuchsia": {255, 0, 255},
"gainsboro": {220, 220, 220},
"ghostwhite": {248, 248, 255},
"gold": {255, 215, 0},
"goldenrod": {218, 165, 32},
"gray": {128, 128, 128},
"green": {0, 128, 0},
"greenyellow": {173, 255, 47},
"grey": {128, 128, 128},
"honeydew": {240, 255, 240},
"hotpink": {255, 105, 180},
"indianred": {205, 92, 92},
"indigo": {75, 0, 130},
"ivory": {255, 255, 240},
"khaki": {240, 230, 140},
"lavender": {230, 230, 250},
"lavenderblush": {255, 240, 245},
"lawngreen": {124, 252, 0},
"lemonchiffon": {255, 250, 205},
"lightblue": {173, 216, 230},
"lightcoral": {240, 128, 128},
"lightcyan": {224, 255, 255},
"lightgoldenrodyellow": {250, 250, 210},
"lightgray": {211, 211, 211},
"lightgreen": {144, 238, 144},
"lightgrey": {211, 211, 211},
"lightpink": {255, 182, 193},
"lightsalmon": {255, 160, 122},
"lightseagreen": {32, 178, 170},
"lightskyblue": {135, 206, 250},
"lightslategray": {119, 136, 153},
"lightslategrey": {119, 136, 153},
"lightsteelblue": {176, 196, 222},
"lightyellow": {255, 255, 224},
"lime": {0, 255, 0},
"limegreen": {50, 205, 50},
"linen": {250, 240, 230},
"magenta": {255, 0, 255},
"maroon": {128, 0, 0},
"mediumaquamarine": {102, 205, 170},
"mediumblue": {0, 0, 205},
"mediumorchid": {186, 85, 211},
"mediumpurple": {147, 112, 219},
"mediumseagreen": {60, 179, 113},
"mediumslateblue": {123, 104, 238},
"mediumspringgreen": {0, 250, 154},
"mediumturquoise": {72, 209, 204},
"mediumvioletred": {199, 21, 133},
"midnightblue": {25, 25, 112},
"mintcream": {245, 255, 250},
"mistyrose": {255, 228, 225},
"moccasin": {255, 228, 181},
"navajowhite": {255, 222, 173},
"navy": {0, 0, 128},
"oldlace": {253, 245, 230},
"olive": {128, 128, 0},
"olivedrab": {107, 142, 35},
"orange": {255, 165, 0},
"orangered": {255, 69, 0},
"orchid": {218, 112, 214},
"palegoldenrod": {238, 232, 170},
"palegreen": {152, 251, 152},
"paleturquoise": {175, 238, 238},
"palevioletred": {219, 112, 147},
"papayawhip": {255, 239, 213},
"peachpuff": {255, 218, 185},
"peru": {205, 133, 63},
"pink": {255, 192, 203},
"plum": {221, 160, 221},
"powderblue": {176, 224, 230},
"purple": {128, 0, 128},
"red": {255, 0, 0},
"rosybrown": {188, 143, 143},
"royalblue": {65, 105, 225},
"saddlebrown": {139, 69, 19},
"salmon": {250, 128, 114},
"sandybrown": {244, 164, 96},
"seagreen": {46, 139, 87},
"seashell": {255, 245, 238},
"sienna": {160, 82, 45},
"silver": {192, 192, 192},
"skyblue": {135, 206, 235},
"slateblue": {106, 90, 205},
"slategray": {112, 128, 144},
"slategrey": {112, 128, 144},
"snow": {255, 250, 250},
"springgreen": {0, 255, 127},
"steelblue": {70, 130, 180},
"tan": {210, 180, 140},
"teal": {0, 128, 128},
"thistle": {216, 191, 216},
"tomato": {255, 99, 71},
"turquoise": {64, 224, 208},
"violet": {238, 130, 238},
"wheat": {245, 222, 179},
"white": {255, 255, 255},
"whitesmoke": {245, 245, 245},
"yellow": {255, 255, 0},
"yellowgreen": {154, 205, 50},
}
// Colorlookup returns a RGB triple corresponding to the named color, "rgb(r,g,b)" or "#rrggbb" string.
// On error, return black.
func Colorlookup(s string) Color {
color, ok := colornames[s]
if ok {
return Color{color.Red, color.Green, color.Blue}
}
var red, green, blue int
ls := len(s)
// rgb(r, g, b)
if strings.HasPrefix(s, "rgb(") && strings.HasSuffix(s, ")") && ls > 5 {
v := colorNumbers(s)
if len(v) == 3 {
red, _ = strconv.Atoi(v[0])
green, _ = strconv.Atoi(v[1])
blue, _ = strconv.Atoi(v[2])
}
return Color{red, green, blue}
}
// #rrggbb
if strings.HasPrefix(s, "#") && ls == 7 {
r, _ := strconv.ParseInt(s[1:3], 16, 32)
g, _ := strconv.ParseInt(s[3:5], 16, 32)
b, _ := strconv.ParseInt(s[5:7], 16, 32)
return Color{int(r), int(g), int(b)}
}
// hsv(hue, saturation, value)
if strings.HasPrefix(s, "hsv(") && strings.HasSuffix(s, ")") && ls > 5 {
v := colorNumbers(s)
if len(v) == 3 {
hue, _ := strconv.ParseFloat(v[0], 64)
sat, _ := strconv.ParseFloat(v[1], 64)
value, _ := strconv.ParseFloat(v[2], 64)
red, green, blue = hsv2rgb(hue, sat, value)
}
return Color{red, green, blue}
}
return Color{0, 0, 0}
}
// colorNumbers returns a list of numbers from a comma separated list,
// in the form of xxx(n1, n2, n3), after removing tabs and spaces.
func colorNumbers(s string) []string {
return strings.Split(strings.NewReplacer(" ", "", "\t", "").Replace(s[4:len(s)-1]), ",")
}
// hsv2rgb converts hsv(h (0-360), s (0-100), v (0-100)) to rgb
// reference: https://en.wikipedia.org/wiki/HSL_and_HSV#HSV_to_RGB
func hsv2rgb(h, s, v float64) (int, int, int) {
s /= 100
v /= 100
if s > 1 || v > 1 {
return 0, 0, 0
}
h = math.Mod(h, 360)
c := v * s
section := h / 60
x := c * (1 - math.Abs(math.Mod(section, 2)-1))
var r, g, b float64
switch {
case section >= 0 && section <= 1:
r = c
g = x
b = 0
case section > 1 && section <= 2:
r = x
g = c
b = 0
case section > 2 && section <= 3:
r = 0
g = c
b = x
case section > 3 && section <= 4:
r = 0
g = x
b = c
case section > 4 && section <= 5:
r = x
g = 0
b = c
case section > 5 && section <= 6:
r = c
g = 0
b = x
default:
return 0, 0, 0
}
m := v - c
r += m
g += m
b += m
return int(r * 255), int(g * 255), int(b * 255)
}