图片上的动态文本

Question

我有一个创建动态图像并在其上写入文本的应用程序。英语文本像广告宣传的那样有效，但其他语言完全失败了。字母变成方框，等等。

package main
import (
"errors"
"fmt"
"image"
"image/color"
"image/png"
"math"
"os"
"github.com/fogleman/gg"
guuid "github.com/google/uuid"
"github.com/jimlawless/whereami"
)
type TextImage struct {
BgImgPath string
FontPath  string
FontSize  float64
Text      string
}
var sentence = make(map[string]string)
var language string
func init() {
sentence["arabic"] = "قفز الثعلب البني فوق الكلب الكسول."
sentence["english"] = "The brown fox jumped over the lazy dog."
sentence["hebrew"] = "השועל החום קפץ מעל הכלב העצלן."
sentence["hindi"] = "भूरी लोमड़ी आलसी कुत्ते के ऊपर से कूद गई।."
sentence["greek"] = "Η καφέ αλεπού πήδηξε πάνω από το τεμπέλικο σκυλί."
}
func main() {
language = "greek"
uuid := genUUID()
createFolder(uuid)
createImage(len(sentence[language]), uuid)
writeImage(sentence[language], uuid)
}
func genUUID() string {
return guuid.New().String()
}
func createFolder(p string) {
path := "./tmp/" + p
if _, err := os.Stat(path); errors.Is(err, os.ErrNotExist) {
err := os.MkdirAll(path, os.ModePerm)
if err != nil {
fmt.Println(err.Error() + " @ " + whereami.WhereAmI())
}
}
}
func writeImage(text string, path string) {
ti := TextImage{
BgImgPath: "./tmp/" + path + "/" + language + ".png",
FontPath:  "./ttf/PlayfairDisplay-Regular.ttf",
FontSize:  24,
Text:      text,
}
img, err := textOnImg(ti)
if err != nil {
fmt.Println(err.Error() + " @ " + whereami.WhereAmI())
}
err = saveImage(img, "./tmp/"+path+"/"+language+".png")
if err != nil {
fmt.Println(err.Error() + " @ " + whereami.WhereAmI())
}
}
func createImage(textlength int, path string) {
minDim := 300
scale := 30
dim := math.Sqrt(float64(textlength))
width := int(dim) * scale
height := int(dim) * scale
if width < minDim || height < minDim {
width = minDim
height = minDim
}
upLeft := image.Point{0, 0}
lowRight := image.Point{width, height}
img := image.NewRGBA(image.Rectangle{upLeft, lowRight})
//img.Bounds()
white := color.RGBA{255, 255, 255, 0xff}
// Set color for each pixel.
for x := 0; x < width; x++ {
for y := 0; y < height; y++ {
switch {
case x < width/2 && y < height/2: // upper left quadrant
img.Set(x, y, white)
case x >= width/2 && y >= height/2: // lower right quadrant
img.Set(x, y, color.White)
default:
img.Set(x, y, color.White)
}
}
}
f, err := os.Create("./tmp/" + path + "/" + language + ".png")
if err != nil {
fmt.Println(err.Error() + " @ " + whereami.WhereAmI())
}
err = png.Encode(f, img)
if err != nil {
fmt.Println(err.Error() + " @ " + whereami.WhereAmI())
}
}
func deleteFolder(folder string) {
err := os.RemoveAll("./tmp/" + folder)
if err != nil {
fmt.Println(err.Error() + " @ " + whereami.WhereAmI())
}
}
func textOnImg(ti TextImage) (image.Image, error) {
bgImage, err := gg.LoadImage(ti.BgImgPath)
if err != nil {
fmt.Println(err.Error() + " @ " + whereami.WhereAmI())
return nil, err
}
imgWidth := bgImage.Bounds().Dx()
imgHeight := bgImage.Bounds().Dy()
dc := gg.NewContext(imgWidth, imgHeight)
dc.DrawImage(bgImage, 0, 0)
if err := dc.LoadFontFace(ti.FontPath, ti.FontSize); err != nil {
fmt.Println(err.Error() + " @ " + whereami.WhereAmI())
return nil, err
}
x := float64(imgWidth / 2)
y := float64((imgHeight / 2) - 80)
maxWidth := float64(imgWidth) - 60.0
dc.SetColor(color.Black)
fmt.Println(ti.Text)
dc.DrawStringWrapped(ti.Text, x, y, 0.5, 0.5, maxWidth, 1.5, gg.AlignLeft)
return dc.Image(), nil
}
func saveImage(img image.Image, path string) error {
if err := gg.SavePNG(path, img); err != nil {
fmt.Println(err.Error() + " @ " + whereami.WhereAmI())
return err
}
return nil
}

有什么建议如何解决这个问题吗?

Answer 1

我修改了一行(就像@dmitry建议的那样)并让它工作(Windows):

FontPath: "C:/Windows/Fonts/arial.ttf",

顺便说一句，你可以使用map字面量来代替init()调用。

var sentence = map[string]string{
"arabic":  "قفز الثعلب البني فوق الكلب الكسول.",
"english": "The brown fox jumped over the lazy dog.",
"hebrew":  "השועל החום קפץ מעל הכלב העצלן.",
"hindi":   "भूरी लोमड़ी आलसी कुत्ते के ऊपर से कूद गई।.",
"greek":   "Η καφέ αλεπού πήδηξε πάνω από το τεμπέλικο σκυλί.",
}