Ascii Graphs js

A simple ascii graphing tool in node.js (and possibly in the browser)

Currently only supporting Histogram (Barcharts) and Sparkline

Basic Usage

var data = [1, 2, 3, 4, 5];
var formatted = histogram_format(data);
console.log(formatted.join('\n'));

API

var formatted_string = histogram_format(data, theme, options);
var options = {
    chart_width /* width of a full bar */
    divider /* character to mark the start and end of bar
    block_formatter /* callback for generating a character block */
    last_formatter /* callback for the last character, can handle partial values */
    max /* override max value */
    min /* override min value */
}

clear_and_log(lines) - clears previously printed lines and updates with new formatted lines

### Examples

- node test.js
- node system.js
- browser test.html


```sh
echo "Array(20).fill(0).map(_=>Math.random() * 1000 | 0).forEach(x => console.log(x))"  | node - | node stdin

echo "Array(2000).fill(0).map(_=>Math.random() * 10000 | 0).forEach(x => console.log(x))"  | node - | node stdin-histogram

### Themes

Use one of these: `standard`, `jim`,`equals`,`stars`,`pipes`,`sparks`, `bitly`.

eg.

var formatted = histogram_format(data, 'jim'); var formatted = histogram_format(data, 'pipes');

### Customization

Take a look at `test.js`

node test

default options

  0 |     | 0.00%
  1 |▉    | 6.67%
  2 |█▋   | 13.33%
  3 |██▌  | 20.00%
  4 |███▎ | 26.67%
  5 |████ | 33.33%

thin (width = 1)

  0 |  | 0.00%
  1 |▎ | 6.67%
  2 |▌ | 13.33%
  3 |▋ | 20.00%
  4 |▉ | 26.67%
  5 |█ | 33.33%

longer (width = 14)

  0 |               | 0.00%
  1 |██▉            | 6.67%
  2 |█████▋         | 13.33%
  3 |████████▌      | 20.00%
  4 |███████████▎   | 26.67%
  5 |██████████████ | 33.33%

random data + standard theme

844 |███▉ | 24.55%
357 |█▋   | 10.38%
448 |██   | 13.03%
899 |████ | 26.13%
473 |██▏  | 13.74%
418 |█▉   | 12.17%

jim theme

844 --------------------------------------------------------o     24.55%
357 -----------------------o                                      10.38%
448 -----------------------------o                                13.03%
899 ------------------------------------------------------------o 26.13%
473 -------------------------------o                              13.74%
418 ---------------------------o                                  12.17%

equals theme

844 |============================]  | 24.55%
357 |===========]                   | 10.38%
448 |==============]                | 13.03%
899 |==============================]| 26.13%
473 |===============]               | 13.74%
418 |=============]                 | 12.17%

stars theme

844 |******************   | 24.55%
357 |*******              | 10.38%
448 |*********            | 13.03%
899 |******************** | 26.13%
473 |**********           | 13.74%
418 |*********            | 12.17%

pipes theme

844 ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||    | 24.55%
357 |||||||||||||||||||||||||                                     | 10.38%
448 |||||||||||||||||||||||||||||||                               | 13.03%
899 ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| | 26.13%
473 |||||||||||||||||||||||||||||||||                             | 13.74%
418 |||||||||||||||||||||||||||||                                 | 12.17%

sparks theme

844 |█ | 24.55%
357 |▄ | 10.38%
448 |▅ | 13.03%
899 |█ | 26.13%
473 |▅ | 13.74%
418 |▅ | 12.17%

bitly theme

204 |∎∎∎∎∎∎∎∎∎∎∎∎∎∎                                               | 9.60%
597 |∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎                   | 28.10%
164 |∎∎∎∎∎∎∎∎∎∎∎                                                  | 7.74%
 82 |∎∎∎∎∎                                                        | 3.85%
234 |∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎                                             | 11.01%
844 |∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎ | 39.71%

loop

1330 |██████████████████████████████ | 22.96% 721 |████████████████▍ | 12.44% 827 |██████████████████▊ | 14.29% 1250 |████████████████████████████▎ | 21.59% 844 |███████████████████▏ | 14.57% 820 |██████████████████▌ | 14.15%

sparkline

| ▁▃▄▅▆▇█| Min: 1.00 Avg: 3.50 Max: 8.00

longer sparkline

|▃▃▁▅▄ ▆█▅▆▅▇▆▄▄▆▇▅▁▇▅▃▆▃▄▃▅▃▄▄▅▅▄▄▅▃▁▄▄▅▁▅▇▆| Min: 0.30 Avg: 49.80 Max: 99.42

animate sparkline

|▃▁▁▁▃▄▄▅▆▆▇▇▇█▇▇▇▇▆▆▅▄▄▃▁▁ ▁▃▃▄▅▅▆▆| Min: -1.00 Avg: 0.84 Max: 1.00

node system Memory usage 16428531712 |████████████████████████████▊ | 100.00% CPU Usage

  0 |████████▊            | 27.44%
  0 |█▍                   | 4.22%
  0 |███████▋             | 24.02%
  0 |█▍                   | 4.22%
  0 |█████▍               | 16.89%
  0 |▊                    | 2.11%
  0 |██████▏              | 19.00%
  0 |▊                    | 2.11%

Trend lines |▅▄▄▄▄▄▄▅▄▄▄▄▄▃▃▃▃▃▃▃▃▄▄▃▄▃▃▄▄▃▁▁▁▁▁▁▁▁▁▁| Min: 0.00 Avg: 0.22 Max: 1.00 |▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁| Min: 0.00 Avg: 0.02 Max: 1.00 |▄▄▃▃▄▃▄▄▄▃▃▄▄▃▃▃▃▃▃▃▃▃▃▃▄▃▁▄▃▃▁▁▁▁▁▁▁▁▁▁| Min: 0.00 Avg: 0.19 Max: 1.00 |▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁| Min: 0.00 Avg: 0.02 Max: 1.00 |▃▃▄▃▃▃▃▄▃▃▃▄▃▃▃▃▁▃▁▁▃▃▃▃▃▁▃▃▃▃▁▁▁▁▁▁▁▁▁▁| Min: 0.00 Avg: 0.16 Max: 1.00 |▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁| Min: 0.00 Avg: 0.02 Max: 1.00 |▄▃▃▃▃▃▃▃▃▃▃▃▃▃▁▁▁▁▃▁▃▁▃▁▃▁▁▃▃▁▁▁▁▁▁▁▁▁▁▁| Min: 0.00 Avg: 0.13 Max: 1.00 |▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁| Min: 0.00 Avg: 0.02 Max: 1.00

#### Other projects that makes ascii graphs

- https://github.com/mkaz/termgraph
- https://github.com/Evizero/UnicodePlots.jl
- https://github.com/kroitor/asciichart
- https://github.com/bitly/data_hacks