react-envelope-graph

A drag-and-drop-enabled, responsive, envelope graph that allows to shape a wave with attack, decay, sustain and release.

Check out the Demo!

Installing

$ npm i --save react-envelope-graph

or

$ yarn add react-envelope-graph

Usage

Import the component

import EnvelopeGraph from "react-envelope-graph";

and then use it:

function App() {
  return (
    <EnvelopeGraph
      defaultXa={1}
      defaultXd={0.5}
      defaultYs={0.5}
      defaultXr={0.7}
      ratio={{
        xa: 0.25,
        xd: 0.25,
        xr: 0.2
      }}
      style={{
        backgroundColor: "black",
        padding: "2.5%",
        height: "100vh",
        width: "20vw"
      }}
      styles={{
        line: {
          fill: "none",
          stroke: "red",
          strokeWidth: 2,
        },
        dndBox: {
          fill: "none",
          stroke: "blue",
          strokeWidth: 0.1,
          height: 1,
          width: 1
        },
        dndBoxActive: {
          fill: "blue",
        }
      }}
      onChange={console.log}
    />
  );
}

Notes

• The height/width ratio is preserved within the svg
• width and height can be specified via the style prop
• defaultXa, defaultXd, defaultYs and defaultXr need to have a value between 0 and 1
• In ratio, the sum of the values xa, xd and xr needs to remain below 0.75. xs is internally set to xs === 0.25.
• Most numeric values in the styles prop must not use a unit (e.g. px or em) as they set values on SVG components (user units)
• Note that styles is not a regular style prop, but a custom prop that additionally allows to configure interaction reactions too
• To regularly style the component, use the style prop
• When defaultXa, defaultXd, defaultYs and defaultXr props are changed, no onChange event is fired and the graph is set to these values.
• Optional props: ratio, dndBox, onChange, style

Contributing

To try the component:

$ git clone git@github.com:TimDaub/react-envelope-graph.git
$ npm i
$ npm run dev

Current Limitations

Help is very much appreciated. I'll try to handle PRs as fast as I can. Below is a list of the current limitations:

• The ya value cannot be set via dragging
• Touch listeners are not yet implemented

Changelog

0.1.4

• defaultXa, defaultXd, defaultYs and defaultXr can now be used to continuously set the graphs values without an onChange event firing

0.1.3

• Bugfix: Dropped getBoundingClientRect in favor of getComputedStyles for measuring the svg's dimensions. Setting margin and padding via style should now be possible without problems.

0.1.2

• Bugfix: Properly fix ratio issues with height and width. They're now members of the style prop

0.1.1

• Hotfix: Set height/width of graph to 100% to respect ratio. I'll have to go back on that fix later...

0.1.0

• Breaking change: Removed functions onAttackChange, onDecayChange, onSustainChange and onReleaseChange in favor of onChange, which returns all values as an object

0.0.11

• When setting the props height and width, the graph's ratio is adjusts accordingly

0.0.10

• Bugfix: Remove ratio.xs from configurable params

0.0.9

• Bugfix: Dragging the function works even thought the graph has any type of padding

0.0.8

• Bugfix: Yet fixing corner length another time...

0.0.7

• Bugfix: Left top corner same length as others

0.0.6

• Add cut corners to graph
• Allow definition of padding through native style prop and remove marginTop, marginRight, marginBottom, and marginRight props

0.0.5

• Improve support for styles prop to allow to styling of the component
• Move dndBox prop to styles

0.0.4

• DnD box's size now configurable

0.0.3

• Bugfix: When mouse leaves graph, DnD stops

0.0.2

• Event subscriptions
• Improved props API
• Responsive

0.0.1

• Dragable ADSR graph

License

MIT