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))
See Also
A util by madnight for drawing Bitcoin/Ether/altcoin charts in command-line console: bitcoin-chart-cli.
Ports
Special thx to all who helped port it to other languages, great stuff!
- Python port included!
- Java: ASCIIGraph, ported by MitchTalmadge. If you're a Java-person, check it out!
- Go: asciigraph, ported by guptarohit, Go people! )
- Haskell: asciichart, ported by madnight to Haskell world!
- Ruby: ascii_chart, ported by zhustec!
- Elixir: asciichart, ported by sndv!
- Perl: App::AsciiChart, ported by vti!
- C: plot, ported by annacrombie with a ruby extension!
- Rust: rasciigraph, ported by orhanbalci!
- PHP: PHP-colored-ascii-linechart, ported by noximo!
Future work (coming soon, hopefully)
- multi-line colored charts in console!
- levels and points on the graph!
- even better value formatting and auto-scaling!
