Remember the picture generator you wrote earlier? Let's write another one, but this time it will return an implementation ofimage.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 (
"image"
"image/color"
"tour/pic"
)
type Image struct{}
func (i *Image) ColorModel() color.Model {
return color.RGBAModel
}
func (i *Image) Bounds() image.Rectangle {
return image.Rect(0, 0, 256, 256)
}
func (i *Image) At(x, y int) color.Color {
v := (uint8)(x^y)
return color.RGBA{v, v, 255, 255}
}
func main() {
m := &Image{}
pic.ShowImage(m)
}