rhythmic-scale/dist/src/rhythmic-scale.js

A utility library for building modular scale systems.

import { ratioToPower } from 'musical-ratios';
import { ensureNotPxRem } from 'empxrem';
const rhythmicScaleDefaultParams = {
    baseFont: 10,
    baseBrowserFontSize: 16,
    lineHeightFactor: 1.2,
};
function scaledSize(ratio, level, size = 1) {
    return size * ratioToPower(ratio, level);
}
export class RhythmicScale {
    baseFont;
    baseBrowserFontSize;
    lineHeightFactor;
    constructor(params = {}) {
        const { baseFont, baseBrowserFontSize, lineHeightFactor } = { ...rhythmicScaleDefaultParams, ...params };
        this.baseFont = baseFont;
        this.baseBrowserFontSize = baseBrowserFontSize;
        this.lineHeightFactor = lineHeightFactor;
    }
    scaledStyles(ratio, level) {
        const scaled = scaledSize(ratio, level, this.baseFont);
        return {
            size: ensureNotPxRem(scaled, this.baseBrowserFontSize),
            lineHeight: ensureNotPxRem(scaled * this.lineHeightFactor, this.baseBrowserFontSize),
        };
    }
}
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