Asciichart NPM

asciichart

Console ASCII line charts in pure Javascript (for NodeJS and browsers) with no dependencies. This code is absolutely free for any usage, you just do whatever the fuck you want.

Usage

NodeJS

npm install asciichart

var asciichart = require ('asciichart')
var s0 = new Array (120)
for (var i = 0; i < s0.length; i++)
    s0[i] = 15 * Math.sin (i * ((Math.PI * 4) / s0.length))
console.log (asciichart.plot (s0))

Browsers

<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
        <meta charset="UTF-8">
        <title>asciichart</title>
        <script src="asciichart.js"></script>
        <script type="text/javascript">
            var s0 = new Array (120)
            for (var i = 0; i < s0.length; i++)
                s0[i] = 15 * Math.sin (i * ((Math.PI * 4) / s0.length))
            console.log (asciichart.plot (s0))
        </script>
    </head>
    <body>
    </body>
</html>

Options

The width of the chart will always equal the length of data series. The height and range are determined automatically.

var s0 = new Array (120)
for (var i = 0; i < s0.length; i++)
    s0[i] = 15 * Math.sin (i * ((Math.PI * 4) / s0.length))
console.log (asciichart.plot (s0))

The output can be configured by passing a second parameter to the plot (series, config) function. The following options are supported:

var config = {

    offset:  3,          // axis offset from the left (min 2)
    padding: '       ',  // padding string for label formatting (can be overrided)
    height:  10,         // any height you want

    // the label format function applies default padding
    format:  function (x, i) { return (padding + x.toFixed (2)).slice (-padding.length) }
}

Scale To Desired Height

var s = []
for (var i = 0; i < 120; i++)
    s[i] = 15 * Math.cos (i * ((Math.PI * 8) / 120)) // values range from -15 to +15
console.log (asciichart.plot (s, { height: 6 }))     // this rescales the graph to ±3 lines

Auto-range

var s2 = new Array (120)
s2[0] = Math.round (Math.random () * 15)
for (i = 1; i < s2.length; i++)
    s2[i] = s2[i - 1] + Math.round (Math.random () * (Math.random () > 0.5 ? 2 : -2))
console.log (asciichart.plot (s2))

Multiple Series

var s2 = new Array (120)
s2[0] = Math.round (Math.random () * 15)
for (i = 1; i < s2.length; i++)
    s2[i] = s2[i - 1] + Math.round (Math.random () * (Math.random () > 0.5 ? 2 : -2))

var s3 = new Array (120)
s3[0] = Math.round (Math.random () * 15)
for (i = 1; i < s3.length; i++)
    s3[i] = s3[i - 1] + Math.round (Math.random () * (Math.random () > 0.5 ? 2 : -2))

console.log (asciichart.plot ([ s2, s3 ]))

Colors

var arr1 = new Array (120)
arr1[0] = Math.round (Math.random () * 15)
for (i = 1; i < arr1.length; i++)
    arr1[i] = arr1[i - 1] + Math.round (Math.random () * (Math.random () > 0.5 ? 2 : -2))

var arr2 = new Array (120)
arr2[0] = Math.round (Math.random () * 15)
for (i = 1; i < arr2.length; i++)
    arr2[i] = arr2[i - 1] + Math.round (Math.random () * (Math.random () > 0.5 ? 2 : -2))

var arr3 = new Array (120)
arr3[0] = Math.round (Math.random () * 15)
for (i = 1; i < arr3.length; i++)
    arr3[i] = arr3[i - 1] + Math.round (Math.random () * (Math.random () > 0.5 ? 2 : -2))

var arr4 = new Array (120)
arr4[0] = Math.round (Math.random () * 15)
for (i = 1; i < arr4.length; i++)
    arr4[i] = arr4[i - 1] + Math.round (Math.random () * (Math.random () > 0.5 ? 2 : -2))

var config = {
    colors: [
        asciichart.blue,
        asciichart.green,
        asciichart.default, // default color
        undefined, // equivalent to default
    ]
}

console.log (asciichart.plot([ arr1, arr2, arr3, arr4 ], config))