After going through a series of random attempts, I put this project on hold for over a year. Now, it’s time to finish what we started but left unfinished before.

Visualizing different fisheye projection formulas in code, with examples for artists and developers.

This post was originally posted on my Cnblogs in summer 2025.
I recently felt like reviewing it again, so I decided to translate it into English and polish it a little.

Disclaimer: I’m not a math-specialized student and I’ve never actually competed in math olympiads.
This article may contain obvious mistakes or non-rigorous steps. I only managed to solve Problems 1, 4, and 6, so these are the only ones covered here.

Hello, world.

This is the very first article on my new independent blog, built with Hugo and the Terminal theme.

For the past few years most of my writing has been on Cnblogs and Luogu Blog, which are both in Simplified Chinese. From now on, the focus of my blog updates will no longer be on these two platforms. This time I’m starting a new space where I plan to write primarily in English.