save zoom canvas

app/pub/scripts/anviewer.js

@@ -16,6 +16,7 @@ function renderPage() {
     var context = canvas.getContext('2d');
     //var viewport = page.getViewport({scale: scale});
     var viewport = page.getViewport({scale: 1.5});
+   // var viewport = page.getViewport(canvas.width / page.getViewport(0.5).width)
     
    
       canvas.height = viewport.height;
@@ -37,7 +38,7 @@ function renderPage() {
           pageNumPending = null;
          
         }
-        document.getElementById('zoompdf').innerHTML = scale + 'x';
+      //  document.getElementById('zoompdf').innerHTML = scale + 'x';
         el_title.innerHTML = 'Приятного чтения ↓';
       });
     });
@@ -83,12 +84,16 @@ function resize_plus(){
     var div = document.getElementById("the-canvas");
     cnt += 4;
     div.style.width = cnt+"%";
+    setzoom(cnt);
 }
 function resize_minus(){
   var div = document.getElementById("the-canvas");
   cnt -= 4;
   div.style.width = cnt+"%";
+  setzoom(cnt);
 }
+
+
 function getzoom(){
 
   var name = 'pdfscale';
@@ -120,11 +125,13 @@ function setzoom( cvalue, exdays = 30 ) {
 
 function startpdfviewer(){
 
-    
+  var div = document.getElementById("the-canvas");
+
     czoom = getzoom();
 
    if (czoom != null)
-       scale = czoom; 
+      div.style.width = czoom+"%";
+  
 
     
     pdfjsLib.getDocument(url).promise.then(function(pdfDoc_) {