[Therion] Scaling problems with backgrounds in th2 files - XTherion
Bruce Mutton
bruce at tomo.co.nz
Mon Mar 19 09:44:53 CET 2018
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, 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.
In the above example, if I zoom out one level, the drawing reduces, but the
image does not change by the same amount.
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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