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d8ffea4781
* Balanced timeline zooming sensitivity between Firefox and Chrome. * Organize the wheel delta zooming logic better.
16 lines
507 B
JavaScript
16 lines
507 B
JavaScript
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const ZOOM_SENSITIVITY = 0.0025;
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const DOM_DELTA_LINE = 1;
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// See https://github.com/d3/d3-zoom/blob/807f02c7a5fe496fbd08cc3417b62905a8ce95fa/src/zoom.js
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function wheelDelta(ev) {
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// Only Firefox seems to use the line unit (which we assume to
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// be 25px), otherwise the delta is already measured in pixels.
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const unitInPixels = (ev.deltaMode === DOM_DELTA_LINE ? 25 : 1);
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return ev.deltaY * unitInPixels * ZOOM_SENSITIVITY;
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}
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export function zoomFactor(ev) {
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return Math.exp(wheelDelta(ev));
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}
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