interesting-pic.go

package main

import "golang.org/x/tour/pic"

func Pic(fun func(x, y int) int) func(dx, dy int) [][]uint8 {
	f := func(dx, dy int) [][]uint8 {
		p := make([][]uint8, dy)
		for i := 0; i < dy; i++ {
			p[i] = make([]uint8, dx)
			for j := 0; j < dx; j++ {
				p[i][j] = uint8(fun(i, j))
			}
		}

		return p
	}

	return f
}

func main() {
	pic.Show(Pic(Formula2))
}

func Formula1(x, y int) int {
	return (x + y) / 2
}

func Formula2(x, y int) int {
	return x * y
}

func Formula3(x, y int) int {
	return x ^ y
}