-
Notifications
You must be signed in to change notification settings - Fork 0
/
color.go
163 lines (134 loc) · 2.97 KB
/
color.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
package camalian
import (
"fmt"
"math"
"strconv"
utils "github.com/nazarhussain/camalian-go/pkg/utils"
)
type HSL struct {
H uint16
S float32
L float32
}
type HSV struct {
H uint16
S float32
V float32
}
type RGB struct {
R uint8
G uint8
B uint8
}
type Color struct {
RGB
HSV HSV
HSL HSL
}
// Build Color object from rgb values
// Specify buildAll = true if you want to calculate HSL/HSV values as well
func (c *Color) Build(r, g, b uint8, buildAll bool) *Color {
c.R = r
c.G = g
c.B = b
if buildAll {
c.buildComponents()
}
return c
}
// Build Color object from Hex string e.g. #FF7913
// Specify buildAll = true if you want to calculate HSL/HSV values as well
func (c *Color) BuildFromHex(hex string, buildAll bool) (*Color, error) {
index := 0
if hex[0] == '#' {
index = 1
}
r, err := strconv.ParseUint(hex[index:index+2], 16, 16)
if err != nil {
return nil, err
}
c.R = uint8(r)
index += 2
g, err := strconv.ParseUint(hex[index:index+2], 16, 16)
if err != nil {
return nil, err
}
c.G = uint8(g)
index += 2
b, err := strconv.ParseUint(hex[index:index+2], 16, 16)
if err != nil {
return nil, err
}
c.B = uint8(b)
if buildAll {
c.buildComponents()
}
return c, nil
}
// Calculate Hue distance between two colors
func (c *Color) HueDistance(c2 *Color) uint16 {
h1 := ((c.HSL.H - c2.HSL.H) % 360)
h2 := ((c2.HSL.H - c.HSL.H) % 360)
min, _ := utils.FindMinMax(h1, h2)
return min.(uint16)
}
// Calculate RGB distance between two colors
func (c *Color) RgbDistance(c2 *Color) float64 {
rsqr := math.Pow((float64(c.R) - float64(c2.R)), 2)
gsqr := math.Pow((float64(c.G) - float64(c2.G)), 2)
bsqr := math.Pow((float64(c.B) - float64(c2.B)), 2)
return math.Sqrt(rsqr + gsqr + bsqr)
}
func (c *Color) ToHex() string {
return fmt.Sprintf("#%02X%02X%02X", c.R, c.G, c.B)
}
func (c *Color) buildComponents() {
ri := float32(c.R) / 255.0
gi := float32(c.G) / 255.0
bi := float32(c.B) / 255.0
hsl := HSL{}
hsv := HSV{}
min, max := utils.FindMinMax(ri, gi, bi)
cmin := min.(float32)
cmax := max.(float32)
delta := cmax - cmin
hsl.L = float32(cmax+cmin) / 2.0
if delta == 0 {
hsl.H = 0
} else if cmax == ri {
hsl.H = 60 * (uint16(((gi - bi) / delta)) % 6)
} else if cmax == gi {
hsl.H = uint16(60 * (((bi - ri) / delta) + 2))
} else if cmax == bi {
hsl.H = uint16(60 * (((ri - gi) / delta) + 4))
}
if delta == 0 {
hsl.S = 0
} else {
hsl.S = float32(delta) / float32(1-math.Abs(float64(2*hsl.L-1)))
}
hsl.S = hsl.S * 100
hsl.L = hsl.L * 100
// HSV Calculation
// Hue calculation
hsv.H = hsl.H
if delta == 0 {
hsv.H = 0
} else if cmax == ri {
hsv.H = 60 * (uint16((gi-bi)/delta) % 6)
} else if cmax == gi {
hsv.H = uint16(60 * (((bi - ri) / delta) + 2))
} else if cmax == bi {
hsv.H = uint16(60 * (((ri - gi) / delta) + 4))
}
// Saturation calculation
if cmax == 0 {
hsv.S = 0
} else {
hsv.S = float32(delta) / float32(cmax) * 100
}
// Value calculation
hsv.V = float32(cmax) * 100
c.HSL = hsl
c.HSV = hsv
}