A Tour of Go. Exercise: Images. 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 call pic.ShowImage. Bounds should return a image.Rectangle, like image.Rect(0, 0, w, …

exercise-60.go

package main

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

type Image struct{
    Width, 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 {
    return color.RGBA{uint8(x * y), 0, 255, 255}
}

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