1 package main
2
3 import "fmt"
4 import "github.com/lucasb-eyer/go-colorful"
5 import "image"
6 import "image/draw"
7 import "image/png"
8 import "math/rand"
9 import "os"
10 import "time"
11
12 func main() {
13 colors := 10
14 blockw := 40
15 space := 5
16
17 rand.Seed(time.Now().UTC().UnixNano())
18 img := image.NewRGBA(image.Rect(0, 0, colors*blockw+space*(colors-1), 6*blockw+8*space))
19
20 warm, err := colorful.WarmPalette(colors)
21 if err != nil {
22 fmt.Printf("Error generating warm palette: %v", err)
23 return
24 }
25 fwarm := colorful.FastWarmPalette(colors)
26 happy, err := colorful.HappyPalette(colors)
27 if err != nil {
28 fmt.Printf("Error generating happy palette: %v", err)
29 return
30 }
31 fhappy := colorful.FastHappyPalette(colors)
32 soft, err := colorful.SoftPalette(colors)
33 if err != nil {
34 fmt.Printf("Error generating soft palette: %v", err)
35 return
36 }
37 brownies, err := colorful.SoftPaletteEx(colors, colorful.SoftPaletteSettings{isbrowny, 50, true})
38 if err != nil {
39 fmt.Printf("Error generating brownies: %v", err)
40 return
41 }
42 for i := 0; i < colors; i++ {
43 draw.Draw(img, image.Rect(i*(blockw+space), 0, i*(blockw+space)+blockw, blockw), &image.Uniform{warm[i]}, image.Point{}, draw.Src)
44 draw.Draw(img, image.Rect(i*(blockw+space), 1*blockw+1*space, i*(blockw+space)+blockw, 2*blockw+1*space), &image.Uniform{fwarm[i]}, image.Point{}, draw.Src)
45 draw.Draw(img, image.Rect(i*(blockw+space), 2*blockw+3*space, i*(blockw+space)+blockw, 3*blockw+3*space), &image.Uniform{happy[i]}, image.Point{}, draw.Src)
46 draw.Draw(img, image.Rect(i*(blockw+space), 3*blockw+4*space, i*(blockw+space)+blockw, 4*blockw+4*space), &image.Uniform{fhappy[i]}, image.Point{}, draw.Src)
47 draw.Draw(img, image.Rect(i*(blockw+space), 4*blockw+6*space, i*(blockw+space)+blockw, 5*blockw+6*space), &image.Uniform{soft[i]}, image.Point{}, draw.Src)
48 draw.Draw(img, image.Rect(i*(blockw+space), 5*blockw+8*space, i*(blockw+space)+blockw, 6*blockw+8*space), &image.Uniform{brownies[i]}, image.Point{}, draw.Src)
49 }
50
51 toimg, err := os.Create("palettegens.png")
52 if err != nil {
53 fmt.Printf("Error: %v", err)
54 return
55 }
56 defer toimg.Close()
57
58 png.Encode(toimg, img)
59 }
60
61 func isbrowny(l, a, b float64) bool {
62 h, c, L := colorful.LabToHcl(l, a, b)
63 return 10.0 < h && h < 50.0 && 0.1 < c && c < 0.5 && L < 0.5
64 }
65
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