Improved comments
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@ -548,17 +548,16 @@ function onMouseButton(e, down) {
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} else {
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clearTimeout(doubleClickTimer);
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// When the distance between the two touches is less than
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// 20 physical pixels force the position of the latter touch
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// to the position of the first.
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// When the distance between the two touches is small enough
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// force the position of the latter touch to the position of
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// the first.
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var xs = lastTouchPos.x - pos.x;
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var ys = lastTouchPos.y - pos.y;
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var d = Math.sqrt((xs * xs) + (ys * ys));
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// The devicePixelRatio is the ratio between logical pixels and
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// physical pixels. A devicePixelRatio of 2 means that the
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// physical linear resolution is double the logical resolution.
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// The goal is to trigger on a certain physical width, the
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// devicePixelRatio brings us a bit closer but is not optimal.
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if (d < 20 * window.devicePixelRatio) {
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pos = lastTouchPos;
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}
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