Guide: Using the const_tweaker crate to modify values at runtime

\_ made by @Pfau

What you can do with it

The const_tweaker crate allows you to modify constants at runtime. This can be used to tweak animations, UI widget positions and much more!

Short guide by example

Add a new const to your file

#[const_tweaker::tweak(min = -100.0, max = 20.0, step = 1.0)]
const EXAMPLE: f64 = 10.0;

Notice the attached attributes above. Every new const needs their own!
This will create an f64 type that can be changed between -100.0 and 20.0 in steps of 1.0.
Adding your changeable value into the code looks like this:

Foo + *EXAMPLE = Sum

Notice how it has to be dereferenced in order to work.

Const_tweaker is feature gated in Veloren/voxygen. So you need to compile with cargo run --features tweak.

Note: go into voxygen folder for this as the compiler won't accept running --features from the root directory.

This will create a local web GUI at 127.0.0.1:9938 where you can play around with the values.