scaleFactor

[hakan at exformedia.se]

As the screenrect is the same but virtually larger / smaller based on the scaleFactor you need calculate the scale factor based on the current scaleFactor and the new scaleFactor

Try this:
on changeScaleFactor pNewScale
   put the scaleFactor of this stack into tScale
   put tScale / pNewScale into tFactor
   put the topLeft of this stack into tTL
   multiply item 1 of tTL by tFactor
   multiply item 2 of tTl by tFactor
   set the scaleFactor of this stack to pNewScale
   set the topLeft of this stack to tTL
end changeScaleFactor

Of course you can substitute topLeft with something else if you want another corner or the center to be the fix point.

:-Håkan
On 16 Aug 2018, 01:11 +0200, Peter Bogdanoff via use-livecode <use-livecode at lists.runrev.com>, wrote:
> I too am using scaleFactor and ran into this issue of the difficulty of windows moving around and even off screen. It seems that when scaleFactor is invoked the entire screen is now virtual and calculations have to be made to position the window where you want it to be visually. Unfortunately, those exact calculations were beyond me at the time I implemented scaleFactor, so my windows do still move somewhat. But if someone else has a method/formula for window placement I too would be interested.
>
> Peter Bogdanoff
> ArtsInteractive
>
>
> > On Aug 15, 2018, at 3:02 PM, Knapp Martin via use-livecode <use-livecode at lists.runrev.com> wrote:
> >
> > I know that scaleFactor is not intended to be a "zoom view" feature for desktop, but in lieu of actually having zoom views, I really need to use it to allow the user to enlarge or reduce the window size for a Mac and Windows app I’m working on. What I would like is for it to shrink or grow from the topLeft point on the screen but I can't seem to figure out a way to keep it from jumping around. I would like to have scaleFactors from .5 to 1.5. Anybody tackled this one?
> >
> > Thanks,
> > Marty
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