[Therion] Scaling problems with backgrounds in th2 files - XTherion

[Martin Sluka]

The same problem. I used undo button to return to the correct state.

Martin S.




> 19. 3. 2018 v 9:44, Bruce Mutton via Therion <therion at speleo.sk>:
> 
> Today I made a new .th2 drawing file and used a .png file as a background image.  Not something I do very much these days, as I typically use .xvi files created PocketTopo files.  The xvi images work just fine in XTherion.
>  
> But as described in the post in this link, https://www.mail-archive.com/therion@speleo.sk/msg06890.html <https://www.mail-archive.com/therion@speleo.sk/msg06890.html>, there are problems when using the mouse wheel to zoom if background images are .jpg or .png.  Until now I have adopted a work around of only using the menu + and – zoom buttons where th2 files are linked to these.
>  
> However for one projected elevation drawing, even the + and – controls are problematic.  I think I accidentally used the mouse wheel before inserting the image.  As a result the image is only aligned with the sketch at one particular zoom level.  144% in this case.  There is also a problem with the image clipping.
> <image001.png>
>  
> In the above example, if I zoom out one level, the drawing reduces, but the image does not change by the same amount.
> <image002.png>
>  
> If I use the zoom wheel, the situation compounds and gets worse.  So I have a situation where I can only align this drawing at one zoom level, and I have to be careful not to use the mouse wheel.
> Not really a problem in this case, as it is a trivial survey and scrap, but it is a significant issue for anyone who might still be regularly using scanned sketches for drawing.
>  
> Is this something that someone knows how to address?
>  
> I’m using Therion 5.4.1+f0c98ce (2018-03-03)
>  
> Bruce
>  
>  
>  
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