Sudoku board drawn by gfx

gfx-sudoku.go

package main

import (
	"math/rand"

	"github.com/peterhellberg/gfx"
)

func main() {
	board := gfx.NewPaletted(9, 9, gfx.Palette15PDX)

	line := []uint8{1, 2, 3, 4, 5, 6, 7, 8, 9}

	rand.Shuffle(len(line), func(i, j int) {
		line[i], line[j] = line[j], line[i]
	})

	max := board.Bounds().Max

	rotations := []int{0, 6, 6, 8, 6, 6, 8, 6, 6}

	for y := 0; y < max.Y; y++ {
		rotate(line, rotations[y])

		for x := 0; x < max.X; x++ {
			board.SetColorIndex(x, y, line[x])

		}

		o := board.PixOffset(0, y)
		gfx.Log("%v", board.Pix[o:o+9])
	}

	gfx.SavePNG("/tmp/gfx-sudoku.png", gfx.NewScaledImage(board, 33))
}

func rotate(nums []uint8, k int) {
	k = k % len(nums)

	if k != 0 {
		copy(nums, append(nums[len(nums)-k:], nums[:len(nums)-k]...))
	}
}

https://play.golang.org/p/Pph5V7dFY0G