tweenjs/tween.js

Help add new easing functions

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#507 opened on Nov 6, 2019

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 (5 comments) (0 reactions) (0 assignees)TypeScript (9,450 stars) (1,458 forks)batch import
Featuregood first issuehelp wanted

Description

We could always use more easing functions.

An easing function is single-variable function that maps values in the range [0, 1] to a numeric value. Generally, we require that f(0) = 0 and f(1) = 1, but otherwise there are no constraints.

If you want to help out feel free to submit a PR, and don't worry about code style. If you need help I can provide a template for your PR.

Tests aren't required for easing functions, but if you want to you can add the new easing function to the graphs example.

Contributor guide

Tech stack
typescriptjavascript
Domain
frontend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
basic mathJavaScript/TypeScript
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
85
Research direction
Look at existing easing functions in the source code (e.g., src/Easing.ts) to understand the pattern. Implement a new function that takes a number t (0 to 1) and returns a number. Ensure f(0)=0 and f(1)=1. The maintainer offers a template, so feel free to ask for help.