webp | WebP Image Conversion Library | User Interface library

First of all, you should not update the coordinates of the crates from the movement of the camera. Instead, let the camera have its own position in 3D space, update that position when you want the player to move, and then subtract the camera position from the crates' positions when calculating the 2D space coordinates. This will make things much easier when you later want to add, for example, the ability for the camera to rotate or the crates themselves to move.

Now to add a rotation capability to the camera, you will need to define a rotation matrix for it in addition to a position. Then, when rendering the crates, you transform the crate coordinates (after subtracting the camera's position) using the inverse of the camera's rotation matrix. This will give you the view space coordinates of the crates, which should be projected onto the 2D space for rendering.

There are many ways to create a rotation matrix depending on what parameters you have. A common one is the Rodrigues rotation formula or "axis-angle" formula, which is used when you have an axis of rotation and an angle to rotate about that axis. Another one is from Euler angles. And if you aren't familiar with matrices and linear algebra, I would recommend you to learn it (there are a lot of free resources available online) as it is used extensively in 3D game development.

Eventually, I couldn't find a way to make it work, so I started developing it myself. Animated GIF, APNG, and Animated webp can be frame-split and even animated on a canvas context in the following.

https://github.com/code4history/Gyeonghwon

Base on source code it uses module mimetypes to guess type

If all you need is 'UserComment', then pass that as a parameter during your popen call:

Add MIME types for png file extension in your servers web config

I had used the element to show WebP with a JPG fallback.

I had misunderstood that the JPG would fall back, because it only falls back when the browser does not support WebP. When it does support WebP it shows a 404 error if the WebP doesn't look.

So in this case, the issue was that the WebP was a 404 error but I was checking the JPG as I expected it to fall back.

Parameters are referenced with the $CmdLine array. The first element ($CmdLine[0] is the number of parameters, $CmdLine[1] is the first parameter, etc.).

According to the documentation on the evaluate method in PhantomJS

Note: The arguments and the return value to the evaluate function must be a simple primitive object. The rule of thumb: if it can be serialized via JSON, then it is fine.

Closures, functions, DOM nodes, etc. will not work!

Instead, you should perform your length calculation inside the evaluate, then return the simple primitive length.