Re: [Gimp-user] Image doesn't move smoothly

[Richard <strata_ranger hotmail com>]

If you have the ability to record your steps on video then that could be more helpful than static screenshots 
and verbal explanations.  But as a quick experiment, I can confirm that moving layers can result in slow 
redraw times, potentially creating general visual mess (but the move operation otherwise executes normally 
and the visual artifacts do clean themselves up afterwards).


If you had a case where the "lag" between moving a layer and the window updating got continually worse the 
more you kept moving the layer, that would be indicative of a cascading event.  Fortunately, that doesn't 
seem to be the case here....


Some caveats I noticed:

- The size of the image canvas, layer in question, and current zoom level seem to have no impact on redraw 
times; only the actual size of the image window whose area is being redrawn.

- Visual artifacts are most noticeable when moving the object upwards.

- Using the Pan function (Spacebar) always results in smooth movement as it is not actually making changes to 
the image, just scrolling its position within the image window.


I do notice that during the move operation all visual redraws originate from the upper-left of the moved 
object.  Not necessarily a bad choice, but could the redraw perhaps originate from the cursor's current 
location within the image window, redrawing outwards?  After all, when you're clicking and dragging 
something, the area around the cursor is generally what your vision is focused on....




-- Stratadrake
strata_ranger hotmail com
--------------------
Numbers may not lie, but neither do they tell the whole truth.
________________________________
From: gimp-user-list <gimp-user-list-bounces gnome org> on behalf of Brombur <forums gimpusers com>
Sent: Wednesday, April 18, 2018 6:13:05 PM
To: gimp-user-list gnome org
Cc: notifications gimpusers com
Subject: [Gimp-user] Image doesn't move smoothly

> I run a dell with 8 gigs of ram and a 3.4 ghz i5 processor. it plays
> online games no problem and again doesn't have any issue with drag on
> pixlr. I have been working on 3500x3500 images on pixlr and I kept
> that file size for gimp 2 and it has issues.

Just tested on a 2400x2400 image and had the same issue. All i had on the page
was a layer with a solid black box. I would move the layer and is was a mess.


--
Brombur (via www.gimpusers.com/forums<http://www.gimpusers.com/forums>)
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