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getting ready to add extended colors but stopping at basic colors for…
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… now
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@wcharczuk
wcharczuk committed Nov 4, 2023
1 parent dd82361 commit 2f3402a
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147 changes: 147 additions & 0 deletions _colors/colors_extended.txt
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aliceblue #f0f8ff 240,248,255
antiquewhite #faebd7 250,235,215
aqua #00ffff 0,255,255
aquamarine #7fffd4 127,255,212
azure #f0ffff 240,255,255
beige #f5f5dc 245,245,220
bisque #ffe4c4 255,228,196
black #000000 0,0,0
blanchedalmond #ffebcd 255,235,205
blue #0000ff 0,0,255
blueviolet #8a2be2 138,43,226
brown #a52a2a 165,42,42
burlywood #deb887 222,184,135
cadetblue #5f9ea0 95,158,160
chartreuse #7fff00 127,255,0
chocolate #d2691e 210,105,30
coral #ff7f50 255,127,80
cornflowerblue #6495ed 100,149,237
cornsilk #fff8dc 255,248,220
crimson #dc143c 220,20,60
cyan #00ffff 0,255,255
darkblue #00008b 0,0,139
darkcyan #008b8b 0,139,139
darkgoldenrod #b8860b 184,134,11
darkgray #a9a9a9 169,169,169
darkgreen #006400 0,100,0
darkgrey #a9a9a9 169,169,169
darkkhaki #bdb76b 189,183,107
darkmagenta #8b008b 139,0,139
darkolivegreen #556b2f 85,107,47
darkorange #ff8c00 255,140,0
darkorchid #9932cc 153,50,204
darkred #8b0000 139,0,0
darksalmon #e9967a 233,150,122
darkseagreen #8fbc8f 143,188,143
darkslateblue #483d8b 72,61,139
darkslategray #2f4f4f 47,79,79
darkslategrey #2f4f4f 47,79,79
darkturquoise #00ced1 0,206,209
darkviolet #9400d3 148,0,211
deeppink #ff1493 255,20,147
deepskyblue #00bfff 0,191,255
dimgray #696969 105,105,105
dimgrey #696969 105,105,105
dodgerblue #1e90ff 30,144,255
firebrick #b22222 178,34,34
floralwhite #fffaf0 255,250,240
forestgreen #228b22 34,139,34
fuchsia #ff00ff 255,0,255
gainsboro #dcdcdc 220,220,220
ghostwhite #f8f8ff 248,248,255
gold #ffd700 255,215,0
goldenrod #daa520 218,165,32
gray #808080 128,128,128
green #008000 0,128,0
greenyellow #adff2f 173,255,47
grey #808080 128,128,128
honeydew #f0fff0 240,255,240
hotpink #ff69b4 255,105,180
indianred #cd5c5c 205,92,92
indigo #4b0082 75,0,130
ivory #fffff0 255,255,240
khaki #f0e68c 240,230,140
lavender #e6e6fa 230,230,250
lavenderblush #fff0f5 255,240,245
lawngreen #7cfc00 124,252,0
lemonchiffon #fffacd 255,250,205
lightblue #add8e6 173,216,230
lightcoral #f08080 240,128,128
lightcyan #e0ffff 224,255,255
lightgoldenrodyellow #fafad2 250,250,210
lightgray #d3d3d3 211,211,211
lightgreen #90ee90 144,238,144
lightgrey #d3d3d3 211,211,211
lightpink #ffb6c1 255,182,193
lightsalmon #ffa07a 255,160,122
lightseagreen #20b2aa 32,178,170
lightskyblue #87cefa 135,206,250
lightslategray #778899 119,136,153
lightslategrey #778899 119,136,153
lightsteelblue #b0c4de 176,196,222
lightyellow #ffffe0 255,255,224
lime #00ff00 0,255,0
limegreen #32cd32 50,205,50
linen #faf0e6 250,240,230
magenta #ff00ff 255,0,255
maroon #800000 128,0,0
mediumaquamarine #66cdaa 102,205,170
mediumblue #0000cd 0,0,205
mediumorchid #ba55d3 186,85,211
mediumpurple #9370db 147,112,219
mediumseagreen #3cb371 60,179,113
mediumslateblue #7b68ee 123,104,238
mediumspringgreen #00fa9a 0,250,154
mediumturquoise #48d1cc 72,209,204
mediumvioletred #c71585 199,21,133
midnightblue #191970 25,25,112
mintcream #f5fffa 245,255,250
mistyrose #ffe4e1 255,228,225
moccasin #ffe4b5 255,228,181
navajowhite #ffdead 255,222,173
navy #000080 0,0,128
oldlace #fdf5e6 253,245,230
olive #808000 128,128,0
olivedrab #6b8e23 107,142,35
orange #ffa500 255,165,0
orangered #ff4500 255,69,0
orchid #da70d6 218,112,214
palegoldenrod #eee8aa 238,232,170
palegreen #98fb98 152,251,152
paleturquoise #afeeee 175,238,238
palevioletred #db7093 219,112,147
papayawhip #ffefd5 255,239,213
peachpuff #ffdab9 255,218,185
peru #cd853f 205,133,63
pink #ffc0cb 255,192,203
plum #dda0dd 221,160,221
powderblue #b0e0e6 176,224,230
purple #800080 128,0,128
red #ff0000 255,0,0
rosybrown #bc8f8f 188,143,143
royalblue #4169e1 65,105,225
saddlebrown #8b4513 139,69,19
salmon #fa8072 250,128,114
sandybrown #f4a460 244,164,96
seagreen #2e8b57 46,139,87
seashell #fff5ee 255,245,238
sienna #a0522d 160,82,45
silver #c0c0c0 192,192,192
skyblue #87ceeb 135,206,235
slateblue #6a5acd 106,90,205
slategray #708090 112,128,144
slategrey #708090 112,128,144
snow #fffafa 255,250,250
springgreen #00ff7f 0,255,127
steelblue #4682b4 70,130,180
tan #d2b48c 210,180,140
teal #008080 0,128,128
thistle #d8bfd8 216,191,216
tomato #ff6347 255,99,71
turquoise #40e0d0 64,224,208
violet #ee82ee 238,130,238
wheat #f5deb3 245,222,179
white #ffffff 255,255,255
whitesmoke #f5f5f5 245,245,245
yellow #ffff00 255,255,0
yellowgreen #9acd32 154,205,50
151 changes: 145 additions & 6 deletions drawing/color.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2,35 +2,137 @@ package drawing

import (
"fmt"
"regexp"
"strconv"
"strings"
)

// Basic Colors from:
// https://www.w3.org/wiki/CSS/Properties/color/keywords
var (
// ColorTransparent is a fully transparent color.
ColorTransparent = Color{R: 255, G: 255, B: 255, A: 0}

// ColorWhite is white.
ColorWhite = Color{R: 255, G: 255, B: 255, A: 255}

// ColorBlack is black.
ColorBlack = Color{R: 0, G: 0, B: 0, A: 255}

// ColorRed is red.
ColorRed = Color{R: 255, G: 0, B: 0, A: 255}

// ColorGreen is green.
ColorGreen = Color{R: 0, G: 255, B: 0, A: 255}

ColorGreen = Color{R: 0, G: 128, B: 0, A: 255}
// ColorBlue is blue.
ColorBlue = Color{R: 0, G: 0, B: 255, A: 255}
// ColorSilver is a known color.
ColorSilver = Color{R: 192, G: 192, B: 192, A: 255}
// ColorMaroon is a known color.
ColorMaroon = Color{R: 128, G: 0, B: 0, A: 255}
// ColorPurple is a known color.
ColorPurple = Color{R: 128, G: 0, B: 128, A: 255}
// ColorFuchsia is a known color.
ColorFuchsia = Color{R: 255, G: 0, B: 255, A: 255}
// ColorLime is a known color.
ColorLime = Color{R: 0, G: 255, B: 0, A: 255}
// ColorOlive is a known color.
ColorOlive = Color{R: 128, G: 128, B: 0, A: 255}
// ColorYellow is a known color.
ColorYellow = Color{R: 255, G: 255, B: 0, A: 255}
// ColorNavy is a known color.
ColorNavy = Color{R: 0, G: 0, B: 128, A: 255}
// ColorTeal is a known color.
ColorTeal = Color{R: 0, G: 128, B: 128, A: 255}
// ColorAqua is a known color.
ColorAqua = Color{R: 0, G: 255, B: 255, A: 255}
)

func parseHex(hex string) uint8 {
v, _ := strconv.ParseInt(hex, 16, 16)
return uint8(v)
}

// ParseColor parses a color from a string.
func ParseColor(rawColor string) Color {
if strings.HasPrefix(rawColor, "rgba") {
return ColorFromRGBA(rawColor)
}
if strings.HasPrefix(rawColor, "rgb") {
return ColorFromRGB(rawColor)
}
if strings.HasPrefix(rawColor, "#") {
return ColorFromHex(rawColor)
}
return ColorFromKnown(rawColor)
}

var rgbaexpr = regexp.MustCompile(`rgba\((?P<R>.+),(?P<G>.+),(?P<B>.+),(?P<A>.+)\)`)

// ColorFromRGBA returns a color from an `rgba()` css function.
func ColorFromRGBA(rgba string) (output Color) {
values := rgbaexpr.FindStringSubmatch(rgba)
for i, name := range rgbaexpr.SubexpNames() {
if i == 0 {
continue
}
if i >= len(values) {
break
}
switch name {
case "R":
value := strings.TrimSpace(values[i])
parsed, _ := strconv.ParseInt(value, 10, 16)
output.R = uint8(parsed)
case "G":
value := strings.TrimSpace(values[i])
parsed, _ := strconv.ParseInt(value, 10, 16)
output.G = uint8(parsed)
case "B":
value := strings.TrimSpace(values[i])
parsed, _ := strconv.ParseInt(value, 10, 16)
output.B = uint8(parsed)
case "A":
value := strings.TrimSpace(values[i])
parsed, _ := strconv.ParseFloat(value, 32)
if parsed > 1 {
parsed = 1
} else if parsed < 0 {
parsed = 0
}
output.A = uint8(parsed * 255)
}
}
return
}

var rgbexpr = regexp.MustCompile(`rgb\((?P<R>.+),(?P<G>.+),(?P<B>.+)\)`)

// ColorFromRGB returns a color from an `rgb()` css function.
func ColorFromRGB(rgb string) (output Color) {
output.A = 255
values := rgbexpr.FindStringSubmatch(rgb)
for i, name := range rgbaexpr.SubexpNames() {
if i == 0 {
continue
}
if i >= len(values) {
break
}
switch name {
case "R":
value := strings.TrimSpace(values[i])
parsed, _ := strconv.ParseInt(value, 10, 16)
output.R = uint8(parsed)
case "G":
value := strings.TrimSpace(values[i])
parsed, _ := strconv.ParseInt(value, 10, 16)
output.G = uint8(parsed)
case "B":
value := strings.TrimSpace(values[i])
parsed, _ := strconv.ParseInt(value, 10, 16)
output.B = uint8(parsed)
}
}
return
}

// ColorFromHex returns a color from a css hex code.
//
// NOTE: it will trim a leading '#' character if present.
Expand All @@ -52,6 +154,43 @@ func ColorFromHex(hex string) Color {
return c
}

func ColorFromKnown(known string) Color {
switch strings.ToLower(known) {
case "white":
return ColorWhite
case "black":
return ColorBlack
case "red":
return ColorRed
case "blue":
return ColorBlue
case "green":
return ColorGreen
case "silver":
return ColorSilver
case "maroon":
return ColorMaroon
case "purple":
return ColorPurple
case "fuchsia":
return ColorFuchsia
case "lime":
return ColorLime
case "olive":
return ColorOlive
case "yellow":
return ColorYellow
case "navy":
return ColorNavy
case "teal":
return ColorTeal
case "aqua":
return ColorAqua
default:
return Color{}
}
}

// ColorFromAlphaMixedRGBA returns the system alpha mixed rgba values.
func ColorFromAlphaMixedRGBA(r, g, b, a uint32) Color {
fa := float64(a) / 255.0
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