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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