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@jsprpalm
jsprpalm / viewer.html
Created May 23, 2019
Pinch zoom implementation for PDF.js viewer
View viewer.html
<!-- Goes into viewer.html just before ending </body> -->
<script>
let pinchZoomEnabled = false;
function enablePinchZoom(pdfViewer) {
let startX = 0, startY = 0;
let initialPinchDistance = 0;
let pinchScale = 1;
const viewer = document.getElementById("viewer");
const container = document.getElementById("viewerContainer");
const reset = () => { startX = startY = initialPinchDistance = 0; pinchScale = 1; };