amplitude-viewer

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

example

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

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 do:

npm install amplitude-viewer

license

MIT