1package main
2
3import "fmt"
4import "github.com/lucasb-eyer/go-colorful"
5import "image"
6import "image/draw"
7import "image/png"
8import "math/rand"
9import "os"
10import "time"
11
12func 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.ZP, 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.ZP, 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.ZP, 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.ZP, 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.ZP, 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.ZP, 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
61func 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