golang word to jpg
In the daily programming process, we often encounter the need to convert text into pictures. Such as generating verification codes or adding text to pictures and other operations. Usually, we use languages such as Python or PHP to implement such operations, but some people may also want to know: Can this task be achieved using Golang?
The answer is yes. As a modern programming language, Go is very powerful. This article will introduce how to use Go to convert text into images or images into text.
First, let’s take a look at how to convert text into images. This functionality can be easily implemented in Go using third-party libraries. We are using a library called "go-cairo" which is the Go binding for Cairo.
The following is the code to convert text into images using Go:
package main
import (
"fmt"
"github.com/ungerik/go-cairo"
)
func main() {
// 创建新的画布
surface, err := cairo.NewSurface(cairo.FORMAT_ARGB32, 500, 500)
if err != nil {
panic(err)
}
defer surface.Finish()
// 设置字体样式
surface.SetFontSize(32)
surface.SetSourceRGB(0, 0, 0)
// 将文本写入画布
surface.MoveTo(50, 50)
surface.ShowText("Hello, World!")
// 保存图片
err = surface.WriteToPNG("golang word to jpg")
if err != nil {
panic(err)
}
fmt.Println("成功将文本转换成图片")
}This code creates a new canvas using the "go-cairo" library. Set the font style on the canvas and write text to the canvas. Finally, save the canvas as an image file in PNG format. By running this code, we can successfully convert text into a PNG image, as shown below:
Next, let’s take a look at how to convert an image into text. Similar to the process of converting text into images, Go can also implement the function of converting images into text through third-party libraries. We are using a library called "gocv", which requires OpenCV to be installed before use.
The following is the code to convert an image into text using Go:
package main
import (
"fmt"
"gocv.io/x/gocv"
)
func main() {
// 读取图片
img := gocv.IMRead("lena.jpg", gocv.IMReadGrayScale)
if img.Empty() {
panic("读取图片失败")
}
// 获取图片的大小
height, width := img.Rows(), img.Cols()
// 声明一个空文本
text := ""
// 对于每个像素，获取其亮度值，并将其转换成 ASCII 字符串
for i := 0; i < height; i++ {
for j := 0; j < width; j++ {
pixel := img.GetIntAt(i, j)
text += string(pixelToASCII(pixel))
}
text += "
"
}
// 将文本保存到文件中
err := writeToFile("image_text.txt", text)
if err != nil {
panic(err)
}
fmt.Println("成功将图片转换成文本")
}
// 将像素值转换成 ASCII 字符串
func pixelToASCII(pixel int) rune {
// ASCII 字符映射表，从 0 ~ 255 对应不同的 ASCII 字符
chars := " .,:;i1tfLCG08@"
// 计算像素的亮度值（0 ~ 255）
brightness := 255 - pixel
// 将亮度值映射到 ASCII 字符集中
ratio := brightness / 25
return rune(chars[ratio])
}
// 将文本保存到文件中
func writeToFile(filename string, content string) error {
file, err := os.Create(filename)
if err != nil {
return err
}
defer file.Close()
_, err = file.WriteString(content)
if err != nil {
return err
}
return nil
}This code reads an image using the "gocv" library. It goes through each pixel and converts the pixel value into an ASCII string. Finally save the text to a text file. By running this code, we can successfully convert an image into ASCII text.
To sum up, it is not difficult to use Go to convert text into images or images into text. You only need to use appropriate third-party libraries to achieve these operations. Of course, this is one of the charms of the Go language.
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