/
githubmirror
/
Chart.js
Обзор
Документация
Войти
/
githubmirror
/
Chart.js
Код
Запросы
0
Пакеты
0
Релизы
0
Аналитика
Безопасность
master
docs/scripts/log2.js
67 строк
2 KB
Jacco van den Berg
add default values so it wont crash on out of memory calculation by calcualting power of infinity (#9060)
10 май 2021, 15:50
Не верифицирован
10 май 2021, 15:50
9885126
Код
Авторство
О чём код?
import {Scale, LinearScale} from 'chart.js'; export default class Log2Axis extends Scale { constructor(cfg) { super(cfg); this._startValue = undefined; this._valueRange = 0; } parse(raw, index) { const value = LinearScale.prototype.parse.apply(this, [raw, index]); return isFinite(value) && value > 0 ? value : null; } determineDataLimits() { const {min, max} = this.getMinMax(true); this.min = isFinite(min) ? Math.max(0, min) : null; this.max = isFinite(max) ? Math.max(0, max) : null; } buildTicks() { const ticks = []; let power = Math.floor(Math.log2(this.min || 1)); let maxPower = Math.ceil(Math.log2(this.max || 2)); while (power <= maxPower) { ticks.push({value: Math.pow(2, power)}); power += 1; } this.min = ticks[0].value; this.max = ticks[ticks.length - 1].value; return ticks; } /** * @protected */ configure() { const start = this.min; super.configure(); this._startValue = Math.log2(start); this._valueRange = Math.log2(this.max) - Math.log2(start); } getPixelForValue(value) { if (value === undefined || value === 0) { value = this.min; } return this.getPixelForDecimal(value === this.min ? 0 : (Math.log2(value) - this._startValue) / this._valueRange); } getValueForPixel(pixel) { const decimal = this.getDecimalForPixel(pixel); return Math.pow(2, this._startValue + decimal * this._valueRange); } } Log2Axis.id = 'log2'; Log2Axis.defaults = {}; // The derived axis is registered like this: // Chart.register(Log2Axis);