Mozilla PdfJs Operations

Question

given a PDF that is rendered in the browser using pdfjs, are there functions to do the following basic view operations:

• rotate
• flip
• zoom

If not, what are the best strategies I can use to do the operations above?

Answer 1

You can set rotation when you getting viewport form PdfPage object:

var viewport = pdfPage.getViewport(scale, rotation);

If you want to immediately set all the parameters, you can clone viewport, created with scale = 1:

var defaultViewport = pdfPage.getViewport(1);
var neededViewport = defaultViewport.clone({scale: needScale, rotation: needRotation, dontFlip: true});