Measure per-letter dimension of text in JavaScript

TL;DR: Create a Range, set proper start and end points up to the text node with proper offset, then use Range.getBoundingClientRect() to get the dimensions.

As a part of the Lyricova Jukebox, we wanted to support inline karaoke swipe animation. With the time tags in the data, it is easy to figure out the time when the animation must reach a certain character. Then we need to figure out a way measure per character dimension for the animation to work.

How LyricsX keeps track of progress of media players

LyricsX is an open source software for macOS to download and display lyrics of current playing track on Music (previously iTunes), Spotify, Audirvana, Vox, Swinsian, or the Now Playing indicator in the OS. It gets time-tagged lyrics files from local storage or internet, and then display the lyrics in sync with the player.

As a crucial component of the development of Lyricova Jukebox, I have researched multiple implementations of real time lyrics display programs, and I found the mechanism behind LyricsX particularly interesting. Here in this article, I’d share with you how LyricsX tracking the player progress in a unique and resource-saving way.


本文又是一篇从 Telegram 的投票评语里面引申出来博文。不知不觉发现这一话题写了很长,就索性再添上一些写进这里。我们不争论我们是否「应该」在中文里面用弯引号云云。如果没有硬性规定,按个人偏好就好。

首先,不同于大部分中文/全角标点,Unicode 里面有一些常用的中文标点是和西文中同样作用的标点共享相同的码位的:

Switch Galaxy Wearable Store Location using XPrivacyLua

Update 6 July 2020: Added alternative method using Riru Location Report Enabler.

Galaxy Wearable Store (GWS) is the app store for Galaxy wearable devices of Samsung. GWS is strongly region-dependent, just like other aspects of the device (you have to do some software hacking for a device purchased in one region to use Samsung Pay in another region). Being able to run with non-Samsung devices means that it cannot rely on the region-of-sale on the phone (and for some reason they didn’t choose to use the region of the device), GWS decided to use the region of your SIM card on the device to determine the store location.

Monitor Connected Devices to an ASUS Router Using Raspberry Pi

Title should have explained it all. A simple Python script to monitor if a certain device has connected to the router via Wi-Fi, and send notifications accordingly. You can use this script for whatever purpose you want2I used it to monitor whether my parent has left home when I am “seemingly asleep”. , though probably you might not be able to find one like most of others.

To use this script, you need SSH access to the router, something in your LAN that is always running (in my case, a Raspberry Pi), and the list of MAC addresses to monitor. In this example, I am using an Asus RT-AC1200GU as the router. Other brand or make might need a different command.

NLP を使わず簡単に中国語と日本語を仕分ける方法


一种简单粗暴无需 NLP 的区分中文和日文文本的方法


Read and Write Tags of Music Files with FFmpeg

In both my previous and recent projects, I have been working with tags (metadata) of music files. One of the reason being I am rather particular about having a nicely organised library with all tag data aligned to the same format. Until recently while I was seeking for a solution to read and write tags of (potentially) all music formats2I only have MP3, FLAC, AIFF and M4A in my library, so that’s kinda all for me., and I encountered FFmpeg, the Swiss Army Knife of media processing.

FFmpeg has always been my go-to solution for processing media programmatically or in batch, and I have recently found the way to write into the tags of music files using it. The way of doing so might be a little verbose as everything have to fit into the command line interface with other components.