[Therion] Scaling problems with backgrounds in th2 files

[Martin Sluka]

Evaristo,

I have experienced this problem too but in different way. Backgroung mooving is accidental very often if I only touch scroll function on mouse. So I have to use undo several times to restore correct state.

m.s.


> 21. 1. 2018 v 20:01, Evaristo Quiroga via Therion <therion at speleo.sk>:
> 
> 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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