Hi John,
I have experienced the same zoom problems in Windows with the scroll
wheel use or + -. If you play with the + - you see, the trace and the
background image are well placed at 25%, 50%, 100% ,200% and 400%. When
you push further this scales the trace and background image are wrong
placed. With the scroll wheel they are wrong always because the % zoom
are normally further or between this scales.
I think is a program bug.
But we have a trick to overcome the problem. Only use the zoom button in
the "Drawing Area" (above the "Background image" control) to choose the
scales 25%, 50%, 100% ,200% or 400%, when you want the trace and
background image well placed. And use scroll wheel or + - when you want
zoom only the trace quickly.
Evaristo.
El 19/01/2018 a las 18:57, John Stevens via Therion escribió:
A method I used to copy from a previous survey was to export the
centreline as a xvi file. Then take a jpg of the old survey and scale
it so the pixel count matches that of the xvi file.
The next step was to use both images as background images in the th2
file. A bit of adjustment of the position location to make them match
then it was simple to copy the old survey.
Now I cant align the images as the zoom function now changes the
scales of the two images differently. If I use a jpg to trace over and
zoom in to trace a detailed area the scaling goes off. The resultant
lines are to the wrong scale and/or are misplaced.
Is there a way of fixing the scale of a background image so it scales
properly. It seems to go wrong with the + – and scroll wheel.
John
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