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package mdtopdf | ||
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import ( | ||
"math" | ||
"strconv" | ||
"strings" | ||
) | ||
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// The functions below were taken almost as is from https://github.com/ajstarks/deck/blob/master/cmd/pdfdeck/colors.go | ||
|
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// 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} | ||
} | ||
|
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// 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]), ",") | ||
} | ||
|
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// 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)) | ||
|
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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) | ||
} |
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