A Tour of Go #59: Images Exercise

images.go

package main

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

func Sqrt(f int) int {
    var z int = 1
    for i:=0;i<5;i++ {
       z=z-(z*z-f)/(2*z)   
    }    
    return z
}

type Image struct{
	width int
    length int
}

func (i Image) Bounds() image.Rectangle {
    return image.Rectangle{image.Point{0,0}, image.Point{i.width,i.length}}
}

func (i Image) At(x, y int) color.Color {
    x1 := Sqrt(x*y)
    
    return color.RGBA{uint8(x),uint8(y)*uint8(x1),255,255} 
}

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

func main() {
    m := Image{200,200}
    pic.ShowImage(m)
}