【GoLang笔记】A Tour of Go - Exercise: Images

来源：互联网发布：淘宝如何入驻亲宝贝编辑：程序博客网时间：2024/06/05 05:08

本笔记是GoLang学习教程的一道习题，题目要求及一种参考实现如下所示。

备注：由于天朝GFW屏蔽了GAE，所以GoLang官网及学习教程需要翻墙才能访问。

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.

参考实现如下：

package mainimport (    "code.google.com/p/go-tour/pic"    "image"    "image/color")type Image struct{    x, y, w, h int    v uint8}func (img Image) ColorModel() color.Model {    return color.RGBAModel}func (img Image) Bounds() image.Rectangle {    return image.Rect(0, 0, img.w, img.h)}func (img Image) At(x, y int) color.Color {    return color.RGBA{img.v, img.v, 255, 255}}func main() {    m := Image{1, 2, 200, 30, 11}    pic.ShowImage(m)}

========================= EOF ===================

0 0