input-mapper
internal use only
https://shaggun.github.io/input-mapper/
When I need to map normalized joystick values to different ranges, let's say I want to move my character from idle animation to a running animation. To avoid joystick jitter I will apply the changes considering some deadzone, that means that the character will start to move when the joystick's raw value is greater or equal than 0.1 (10% deadzone) up until 0.9, now imagine that at 0.1 I want to increase the animation speed modifier from 0 to 1 according to the joystick's values considering the deadzones. That leaves me with the following points: (0.1, 0), (0.9, 1)
I can find an equation by calculating the slope and the intercept, that will give me a linear function, which it's enough in most cases. Now, let's say I want some kind of interpolation to smooth out the movement, I start slowly and it speeds up towards the end, I could use a simple quadratic function to do that. These calculations are trivial but it won't hurt saving some minutes to do it.
Note that the quadratic functions are only valid for half an axis when X starts at 0, if I want to use a function taking both, negative and positive axis values, where -1<=X<=1 I can use a sine function, a cubic function or a linear function
A Vue.js project