本分支主要解决：

1.字母超出边界问题

2.公开img变量，以便保存成任何格式

3.增加保存jpg、png、gif文件函数

Package captcha provides an easy to use, unopinionated API for captcha generation.

Why another captcha generator?

I want a simple and framework-independent way to generate captcha. It also should be flexible, at least allow me to pick my favorite font.

install

go get github.com/mzky/captcha

usage

func handle(w http.ResponseWriter, r *http.Request) {
	// create a captcha of 150x50px
	data, _ := captcha.New(150, 50)

	// session come from other library such as gorilla/sessions
	session.Values["captcha"] = data.Text
	session.Save(r, w)
	// send image data to client
	data.WriteImage(w)
}

documentation | example | font example

sample image

Compatibility

This package uses embed package from Go 1.16. If for some reasons you have to use pre 1.16 version of Go, reference pre 1.4 version of this module in your go.mod.

Contributing

If your found a bug, please contribute! see contributing.md for more detail.

License

MIT