在图像上的动态文本

huangapple
go评论104阅读模式
英文:

Dynamic text on image

问题

我有一个应用程序，它创建一个动态图像并在上面写入文本。
英文文本按预期工作，但其他语言完全失败。字母变成方框等。
有什么建议如何解决这个问题吗？

英文:

I have an application that creates a dynamic image and writes text on it.
The English language text works as advertised but other languages fail completely. The letters become boxes, etc.

  1. package main
  3. import (
  4. 	"errors"
  5. 	"fmt"
  6. 	"image"
  7. 	"image/color"
  8. 	"image/png"
  9. 	"math"
  10. 	"os"
  12. 	"github.com/fogleman/gg"
  13. 	guuid "github.com/google/uuid"
  15. 	"github.com/jimlawless/whereami"
  16. )
  18. type TextImage struct {
  19. 	BgImgPath string
  20. 	FontPath  string
  21. 	FontSize  float64
  22. 	Text      string
  23. }
  25. var sentence = make(map[string]string)
  26. var language string
  28. func init() {
  29. 	sentence["arabic"] = "قفز الثعلب البني فوق الكلب الكسول."
  30. 	sentence["english"] = "The brown fox jumped over the lazy dog."
  31. 	sentence["hebrew"] = "השועל החום קפץ מעל הכלב העצלן."
  32. 	sentence["hindi"] = "भूरी लोमड़ी आलसी कुत्ते के ऊपर से कूद गई।."
  33. 	sentence["greek"] = "Η καφέ αλεπού πήδηξε πάνω από το τεμπέλικο σκυλί."
  34. }
  36. func main() {
  37. 	language = "greek"
  38. 	uuid := genUUID()
  39. 	createFolder(uuid)
  40. 	createImage(len(sentence[language]), uuid)
  41. 	writeImage(sentence[language], uuid)
  42. }
  44. func genUUID() string {
  45. 	return guuid.New().String()
  46. }
  48. func createFolder(p string) {
  49. 	path := "./tmp/" + p
  50. 	if _, err := os.Stat(path); errors.Is(err, os.ErrNotExist) {
  51. 		err := os.MkdirAll(path, os.ModePerm)
  52. 		if err != nil {
  53. 			fmt.Println(err.Error() + " @ " + whereami.WhereAmI())
  54. 		}
  55. 	}
  56. }
  58. func writeImage(text string, path string) {
  59. 	ti := TextImage{
  60. 		BgImgPath: "./tmp/" + path + "/" + language + ".png",
  61. 		FontPath:  "./ttf/PlayfairDisplay-Regular.ttf",
  62. 		FontSize:  24,
  63. 		Text:      text,
  64. 	}
  65. 	img, err := textOnImg(ti)
  66. 	if err != nil {
  67. 		fmt.Println(err.Error() + " @ " + whereami.WhereAmI())
  68. 	}
  69. 	err = saveImage(img, "./tmp/"+path+"/"+language+".png")
  70. 	if err != nil {
  71. 		fmt.Println(err.Error() + " @ " + whereami.WhereAmI())
  72. 	}
  73. }
  75. func createImage(textlength int, path string) {
  76. 	minDim := 300
  77. 	scale := 30
  78. 	dim := math.Sqrt(float64(textlength))
  79. 	width := int(dim) * scale
  80. 	height := int(dim) * scale
  82. 	if width < minDim || height < minDim {
  83. 		width = minDim
  84. 		height = minDim
  85. 	}
  87. 	upLeft := image.Point{0, 0}
  88. 	lowRight := image.Point{width, height}
  90. 	img := image.NewRGBA(image.Rectangle{upLeft, lowRight})
  91. 	//img.Bounds()
  92. 	white := color.RGBA{255, 255, 255, 0xff}
  94. 	// Set color for each pixel.
  95. 	for x := 0; x < width; x++ {
  96. 		for y := 0; y < height; y++ {
  97. 			switch {
  98. 			case x < width/2 && y < height/2: // upper left quadrant
  99. 				img.Set(x, y, white)
  100. 			case x >= width/2 && y >= height/2: // lower right quadrant
  101. 				img.Set(x, y, color.White)
  102. 			default:
  103. 				img.Set(x, y, color.White)
  104. 			}
  105. 		}
  106. 	}
  108. 	f, err := os.Create("./tmp/" + path + "/" + language + ".png")
  109. 	if err != nil {
  110. 		fmt.Println(err.Error() + " @ " + whereami.WhereAmI())
  111. 	}
  112. 	err = png.Encode(f, img)
  113. 	if err != nil {
  114. 		fmt.Println(err.Error() + " @ " + whereami.WhereAmI())
  115. 	}
  116. }
  118. func deleteFolder(folder string) {
  119. 	err := os.RemoveAll("./tmp/" + folder)
  120. 	if err != nil {
  121. 		fmt.Println(err.Error() + " @ " + whereami.WhereAmI())
  122. 	}
  123. }
  125. func textOnImg(ti TextImage) (image.Image, error) {
  126. 	bgImage, err := gg.LoadImage(ti.BgImgPath)
  127. 	if err != nil {
  128. 		fmt.Println(err.Error() + " @ " + whereami.WhereAmI())
  129. 		return nil, err
  130. 	}
  131. 	imgWidth := bgImage.Bounds().Dx()
  132. 	imgHeight := bgImage.Bounds().Dy()
  134. 	dc := gg.NewContext(imgWidth, imgHeight)
  135. 	dc.DrawImage(bgImage, 0, 0)
  137. 	if err := dc.LoadFontFace(ti.FontPath, ti.FontSize); err != nil {
  138. 		fmt.Println(err.Error() + " @ " + whereami.WhereAmI())
  139. 		return nil, err
  140. 	}
  142. 	x := float64(imgWidth / 2)
  143. 	y := float64((imgHeight / 2) - 80)
  144. 	maxWidth := float64(imgWidth) - 60.0
  145. 	dc.SetColor(color.Black)
  146. 	fmt.Println(ti.Text)
  147. 	dc.DrawStringWrapped(ti.Text, x, y, 0.5, 0.5, maxWidth, 1.5, gg.AlignLeft)
  149. 	return dc.Image(), nil
  150. }
  152. func saveImage(img image.Image, path string) error {
  153. 	if err := gg.SavePNG(path, img); err != nil {
  154. 		fmt.Println(err.Error() + " @ " + whereami.WhereAmI())
  155. 		return err
  156. 	}
  157. 	return nil
  158. }

Any recommendations how to fix this?

答案1

得分: 2

我更改了一行代码（如@dmitry建议的），并使其在Windows上工作：

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

顺便说一句，你可以使用映射字面量代替init()调用。

  1. var sentence = map[string]string{
  2. 	"arabic":  "قفز الثعلب البني فوق الكلب الكسول.",
  3. 	"english": "The brown fox jumped over the lazy dog.",
  4. 	"hebrew":  "השועל החום קפץ מעל הכלב העצלן.",
  5. 	"hindi":   "भूरी लोमड़ी आलसी कुत्ते के ऊपर से कूद गई।",
  6. 	"greek":   "Η καφέ αλεπού πήδηξε πάνω από το τεμπέλικο σκυλί.",
  7. }
英文:

I changed one line (as @dmitry suggested) and got it to work (Windows):

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

BTW you can use a map literal instead of the init() call.

  1. var sentence = map[string]string{
  2. 	"arabic":  "قفز الثعلب البني فوق الكلب الكسول.",
  3. 	"english": "The brown fox jumped over the lazy dog.",
  4. 	"hebrew":  "השועל החום קפץ מעל הכלב העצלן.",
  5. 	"hindi":   "भूरी लोमड़ी आलसी कुत्ते के ऊपर से कूद गई।.",
  6. 	"greek":   "Η καφέ αλεπού πήδηξε πάνω από το τεμπέλικο σκυλί.",
  7. }

huangapple
  • 本文由 发表于 2022年5月31日 06:29:26
  • 转载请务必保留本文链接：https://go.coder-hub.com/72440589.html
  • go
  • image
  • image-processing
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