28 lines
488 B
JavaScript
28 lines
488 B
JavaScript
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function Rolling(value, frames)
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{
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var lag = 0;
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if (!frames)
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frames = 24;
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this.value = value;
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Object.defineProperty(this, "lag", {
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get: function() { return lag; },
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enumerable: true
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});
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this.update = function() {
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var delta = this.value - lag;
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var dir = Math.sign(delta);
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var speed = Math.abs(delta) / frames;
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var mag = Math.min(Math.abs(speed), Math.abs(delta));
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lag += mag * dir;
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return lag;
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}
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}
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module.exports = Rolling;
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