Viewer element resize after screenshot

[vz-chameleon]

Hi !
I'm trying to use your plugin to take screenshots of my OpenSeaDragon viewer and i came across an interesting bug : I had the developper console for Firefox open and after I've taken a simple screenshot (with the 'Just take a screenshot' option) the viewport size is reduced. Same happens if i resize the browser's page, take a screenshot, and then go back to a full page size. I've attached some screenshots to illustrate.

Looking through your plugin I saw that at some point you redefine the viewer's element height and width
viewer.element.style.height = output_y_size + "px";
viewer.element.style.width = output_y_size + "px";

Is this necessary to take the screenshot ? I've commented all redefinitions of viewer element's height and width and this seems to fix the bug, but I don't know if by doing so i've killed off some functionalities

Thanks in advance for your help ! :)

[KTGLeiden]

Hi there!

I will look into this tomorrow. Thanks for the pointer, it's some time ago but I think I'll find out :)

Thanks,

~Koen

• Edit:
  Height should not be altered when just taking a screenshot. This is definitely a bug. The reason why I do this is the option for bigger resolutions (the idea is just to make the canvas size bigger, wait for a reload and snap it). This was especially useful in applications regarding extremely high resolution tissue scans (which I worked with).
  Whatever is going wrong, no idea, but I do recall not testing (a lot) on FF, will do so tommorow.

Cheers,
~Koen

[KTGLeiden]

@vz-chameleon :
It actually "works correctly", but only when the viewer is set to a certain size. You probably defined yours as an percentage of the screen, which allows you to scale your display.

What happens is that I first:

• Save current size in pixels
• Alter size
• Take snapshot
• Reset size to the original one

So this obviously does not work when you want your display to scale.
Let me think about a fix. I have no idea where this percentage style is saved, actually.

In the mean time, it might be satisfyable for you to comment out the lines you mentioned and disable the "showOptions" variable. This means you're always "just" making a screenshot, but it does not touch the dimensions of your viewer.

~Koen

[vz-chameleon]

You're right, I defined mine with a percentage of the screen.
Thank you very much for your help ! I'll try to find a fix also, after I'm done with some other features
Cheers 👍

[andydu001]

Hi,
I would like to use your openseadragon-screenshot, but it has some bugs in it. Can you help me out please?
Andy