Remember the picture generator you wrote earlier? Let's write another one, but this time it will return an implementation of image.Image instead of a slice of data.

Define your own Image type, implement the necessary methods, and callpic.ShowImage.

Bounds should return a image.Rectangle, like image.Rect(0, 0, w, h).

ColorModel should return color.RGBAModel.

At should return a color; the value v in the last picture generator corresponds to color.RGBA{v, v, 255, 255} in this one.

package main

import (
"code.google.com/p/go-tour/pic"
"image"
"image/color"
) type Image struct{} func (img Image) ColorModel() color.Model {
return color.RGBAModel
} func (img Image) Bounds() image.Rectangle {
return image.Rect(, , , )
} func (img Image) At(x, y int) color.Color {
return color.RGBA{uint8(x), uint8(y), , }
} func main() {
m := Image{}
pic.ShowImage(m)
}

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