A Tour of Go - Exercise: Images http://tour.golang.org/#60

image.go

package main

import (
    "code.google.com/p/go-tour/pic"
    "image"
    "image/color"
)


type Image struct{
    width int
    height int
}

func (img Image) ColorModel() color.Model {
    return color.RGBAModel
}

func (img Image) Bounds() image.Rectangle {
    return image.Rect(0, 0, img.width, img.height)
}

func (img Image) At(x, y int) color.Color {
    img_func := func(x, y int) uint8 {
        //return uint8(x*y)
        //return uint8((x+y) / 2)
        return uint8(x^y)
    }
    v := img_func(x, y)
    return color.RGBA{v, v, 255, 255}
}


func main() {
    m := Image{256, 64}
    pic.ShowImage(m)
}

package main

import (
	"golang.org/x/tour/pic"
	"image"
	"image/color"
)

type Image struct {
	width, height int
}

func (i Image) ColorModel() color.Model {
	return color.RGBAModel
}

func (i Image) Bounds() image.Rectangle {
	return image.Rect(0, 0, i.width, i.height)
}

func (i Image) At(x, y int) color.Color {
	return color.RGBA{interpretCoordinate(x,y),interpretCoordinate(x,y), 255, 255}
}

func interpretCoordinate(x, y int) uint8 {
	n := x^y
	
	return uint8(n)
}

func main() {
	m := Image{100, 100}
	pic.ShowImage(m)
}