Gil Barbara
22 lines
690 B
JavaScript
22 lines
690 B
JavaScript
class ScaleLog {
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constructor (options) {
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options = options || {};
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this.fontMin = options.fontMin || 1.2;
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this.fontMax = options.fontMax || 5;
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this.unit = options.unit || 'rem';
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this.min = (options.min || 1);
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this.max = (options.max || 50);
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this.scale = (this.max - this.min) / (this.fontMax - this.fontMin);
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}
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value (qty) {
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return (qty === this.min ? this.fontMin : (qty / this.max) * (this.fontMax - this.fontMin) + this.fontMin).toFixed(2) + this.unit;
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//Math.exp((position - this.fontMin) * this.scale + this.min);
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}
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}
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// Usage: new LogSlider({ min: 10, max: 100 });
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module.exports = ScaleLog;
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