Handwriting recognition on the site?

Question

PHP

The sites www.zhonga.ru/ and www.nciku.com/ provide the possibility of handwriting input of hieroglyphs.
The front end passes data to the handler in the form of coordinates, and in the opposite direction receives the most relevant hieroglyphs.
Of the ready-made solutions, I found only a script written in Java.
Can you please tell me how to implement something like this?
And what might be used on the sites mentioned above?
谢谢！

Answer 1

This can also be implemented in JavaScript , if desired.
The task of recognition is not tied to the language in any way. Ready-made solutions - a lot. Unfortunately (or fortunately) I didn’t have to deal with text recognition, only images. But you can search even here, on Habré, for an example of the implementation of captcha recognition. This principle can be implemented.

Answer 2

The second site uses Flash...