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