修改 练习：切片(moretypes/18) 章节的引用问题

content/moretypes/exercise-slices.go

@@ -2,7 +2,7 @@
 
 package main
 
-import "golang.org/x/tour/pic"
+import "github.com/Go-zh/tour/pic"
 
 func Pic(dx, dy int) [][]uint8 {
 }

pic/pic.go

@@ -0,0 +1,43 @@
+// Copyright 2011 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package pic // import "github.com/Go-zh/tour/pic"
+
+import (
+	"bytes"
+	"encoding/base64"
+	"fmt"
+	"image"
+	"image/png"
+)
+
+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)
+}