activity-envelope

Installation

npm i activity-envelope

Overview

ActivityEnvelope is an activity monitor of sorts, which can be used to drive visualizations or other responsive features in an interactive experience. It supports both pull and push models; the linearValue getter can be used to poll a calculated activity level, or external code can subscribe to phase change events.

The ActivityEnvelope is designed similarly to the classic envelope generators used in synthesizers, with a key difference: "sustain" is not a fixed level, but a fixed duration. The sustain phase is intended to model the period of time in which a new impulse will not change the activity level, but instead will further delay the release phase.

Demo App

Find a demo app at the root level of the repository here.