[Go语言]我的第九个Go语言程序

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, 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 (
"golang.org/x/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(0, 0, 100, 100)
}

func (img Image) At(x, y int) color.Color {
return color.RGBA{uint8(x ^ y), uint8(x ^ y), 255, 255}
}

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