Please give a brief summary of your issue:
Freehand annotations misalign with document content when zooming out
Please describe your issue and provide steps to reproduce it:
When using the Freehand Highlight tool in WebViewer, annotations are correctly aligned with the document content at 100% zoom. However, when zooming out, the annotations appear to be on a separate layer and become misaligned with the underlying document.
Steps to reproduce:
Open any document (PDF or image) in WebViewer
Select the Freehand Highlight tool
Draw annotations on specific content at 100% zoom
Zoom out using mouse wheel or zoom controls
Observe that the annotations no longer align correctly with their intended positions on the document
I’ve noticed this issue occurs in your own demo presentations as well, confirming this is likely a known rendering behavior rather than an implementation error in our code.
Technical details:
We’re using the latest WebViewer with fullAPI enabled
The issue occurs with both PDF documents and images
We’ve implemented proper event listeners for annotation changes
The problem persists across different browsers and devices
None of these completely resolve the issue. We’re looking for an official solution to ensure annotations maintain proper alignment at all zoom levels.
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It seems you’re experiencing an issue with freehand annotations misaligning with document content when zooming out in WebViewer. This can occur due to how the rendering layers are handled at different zoom levels, especially with complex documents or images.
Some things you can try:
Ensure that you are using the latest version of WebViewer, as updates often include fixes for rendering issues.
Check if the issue persists when using different rendering modes like ‘canvas’ or ‘svg’ by configuring the WebViewer accordingly.
Try using the ‘fullAPI’ option to enable more precise rendering and annotation handling.
Look into adjusting the zoom level programmatically after annotations are drawn to see if recalibrating the view helps maintain alignment.
Here are some resources that might help you:
Migrating to V6: Discusses changes in annotation handling that might impact your setup.
We have raised this issue and have added it to our backlog for our Product team to review. We do not have a firm timeline at this moment when the issue will be worked on, but we will be sure to reach out on this forum post if we have an update to provide.
Thank you for bringing this to our attention.
Best Regards,
Jacob Romano Carlsen
Web Development Support Engineer Apryse Software Inc.
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