22. 实现Pic

package main

import (
    "fmt"
    "image"
    "bytes"
    "image/png"
    "encoding/base64"
)

func Pic(dx, dy int) [][]uint8 {
    //dx元素长度，dy整个slice长度
    s := [][]uint8{}
    ss := []uint8{}

    for i := 0; i < dx; i++ {
        ss = append(ss, 45)
    }

    for i := 0; i < dy; i++ {
        s = append(s, ss)
    }

    return s
}
func Show(f func(int, int) [][]uint8) {
    const (
        dx = 256
        dy = 256
    )
    data := f(dx, dy)
    m := image.NewNRGBA(image.Rect(0, 0, dx, dy))
    for y := 0; y < dy; y++ {
        for x := 0; x < dx; x++ {
            v := data[y][x]
            i := y*m.Stride + x*4
            m.Pix[i] = v
            m.Pix[i+1] = v
            m.Pix[i+2] = 255
            m.Pix[i+3] = 255
        }
    }
    ShowImage(m)
}
func ShowImage(m image.Image) {
    var buf bytes.Buffer
    err := png.Encode(&buf, m)
    if err != nil {
        panic(err)
    }
    enc := base64.StdEncoding.EncodeToString(buf.Bytes())
    fmt.Println("IMAGE:" + enc)
}
func main() {
    Show(Pic)
}

在浏览器运行，可以看到运行结果。

实现的图片