https://github.com/skratchdot/amplitude-viewer

render amplitudes like an oscilloscope in the browser given arrays of data
https://github.com/skratchdot/amplitude-viewer

Last synced: about 1 month ago
JSON representation

render amplitudes like an oscilloscope in the browser given arrays of data

• Host: GitHub
• URL: https://github.com/skratchdot/amplitude-viewer
• Owner: skratchdot
• License: other
• Created: 2014-03-30T14:03:06.000Z (almost 11 years ago)
• Default Branch: master
• Last Pushed: 2014-03-30T14:07:21.000Z (almost 11 years ago)
• Last Synced: 2024-10-19T00:24:22.029Z (3 months ago)
• Language: JavaScript
• Size: 115 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: readme.markdown
  • License: LICENSE

Awesome Lists containing this project

README

        
# amplitude-viewer

render amplitudes like an oscilloscope in the browser given arrays of data

# example

``` js

var ascope = require('amplitude-viewer')(fn);

ascope.appendTo('#scope');

setInterval(function () {

    ascope.setTime(Date.now() / 1000);

    ascope.draw(fn);

}, 50);

function fn (t) {

    return sin(440) * 0.25 + sin(441) * 0.25 + sin(880) * 0.5;

    function sin (x) { return Math.sin(2 * Math.PI * t * x) }

}

```

# methods

``` js

var viewer = require('amplitude-viewer')

```

## var ascope = viewer()

Create a new viewer.

## ascope.appendTo(target)

Append the ascope element to `target`, a query selector string or container

element.

## ascope.setTime(t)

Set the drawing time in seconds.

## ascope.setOffset(t)

Set an offset to the drawing time in seconds.

## ascope.setDuration(d)

Set the width of the time window.

## ascope.draw(fn)

Draw a wave according to `fn(t)`, which should return an amplitude from -1 to 1

give a time `t` in seconds.

# install

With [npm](https://npmjs.org) do:

```

npm install amplitude-viewer

```

# license

MIT