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Hey, I extended this thing to allow a fixed y-axis, instead of computing the bounds automatically. Just add min- and max fields to the config object. The data will be clamped in case it goes out of bounds. Feel free to commit.
"use strict";
(function (exports) {
exports.plot = function (series, cfg = undefined) {
cfg = (typeof cfg !== 'undefined') ? cfg : {}
let min = cfg.min;
let max = cfg.max;
if (min === undefined || max === undefined) {
min = series[0]
max = series[0]
for (let i = 1; i < series.length; i++) {
min = Math.min (min, series[i])
max = Math.max (max, series[i])
}
} else {
// clamp values to min, max
for (let i = 0; i < series.length; i++) {
series[i] = Math.max(min, Math.min(max, series[i]))
}
}
let range = Math.abs (max - min)
let offset = (typeof cfg.offset !== 'undefined') ? cfg.offset : 3
let padding = (typeof cfg.padding !== 'undefined') ? cfg.padding : ' '
let height = (typeof cfg.height !== 'undefined') ? cfg.height : range
let ratio = range !== 0 ? height / range : 1;
let min2 = Math.round (min * ratio)
let max2 = Math.round (max * ratio)
let rows = Math.abs (max2 - min2)
let width = series.length + offset
let format = (typeof cfg.format !== 'undefined') ? cfg.format : function (x) {
return (padding + x.toFixed (2)).slice (-padding.length)
}
let result = new Array (rows + 1) // empty space
for (let i = 0; i <= rows; i++) {
result[i] = new Array (width)
for (let j = 0; j < width; j++) {
result[i][j] = ' '
}
}
for (let y = min2; y <= max2; ++y) { // axis + labels
let label = format (rows > 0 ? max - (y - min2) * range / rows : y, y - min2)
result[y - min2][Math.max (offset - label.length, 0)] = label
result[y - min2][offset - 1] = (y == 0) ? '┼' : '┤'
}
let y0 = Math.round (series[0] * ratio) - min2
result[rows - y0][offset - 1] = '┼' // first value
for (let x = 0; x < series.length - 1; x++) { // plot the line
let y0 = Math.round((series[x + 0] * ratio) - min2)
let y1 = Math.round((series[x + 1] * ratio) - min2)
if (y0 == y1) {
result[rows - y0][x + offset] = '─'
} else {
result[rows - y1][x + offset] = (y0 > y1) ? '╰' : '╭'
result[rows - y0][x + offset] = (y0 > y1) ? '╮' : '╯'
let from = Math.min (y0, y1)
let to = Math.max (y0, y1)
for (let y = from + 1; y < to; y++) {
result[rows - y][x + offset] = '│'
}
}
}
return result.map (function (x) { return x.join ('') }).join ('\n')
}
}) (typeof exports === 'undefined' ? /* istanbul ignore next */ this['asciichart'] = {} : exports);
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