SASGIS - SAS.Планета
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IDProjectCategoryView StatusDate SubmittedLast Update
0003923SAS.Планета[All Projects] Баг / Bugpublic09-12-2025 04:5731-12-2025 14:01
Reporterqq117511 
Assigned Tozed 
PrioritynormalSeverityminorReproducibilityalways
StatusclosedResolutionduplicate 
PlatformWindowsOS7OS VersionEnterprise
Product Version250505 
Target VersionFixed in Version 
Summary0003923: Map flickers while zooming
DescriptionWhen I use sas.planet and drag the map with the mouse, the whole map view keeps flickering as if it is being completely redrawn on every small move. Instead of smoothly panning, the tiles flash or momentarily disappear and then reappear, so the entire map looks like it is constantly “reconstructing” during dragging. This makes map navigation uncomfortable and feels like a rendering or refresh bug in the current version.
Steps To Reproduce
Additional Information
TagsNo tags attached.
Relationships
duplicate of 0002686resolved zed "Моргает" карта при активной закачке и изменении зума 
Attached Files? 12月10日.mp4 (1,349,242) 10-12-2025 04:35
http://www.sasgis.org/mantis/file_download.php?file_id=2652&type=bug
png ScreenShot_2025-12-10_124042_409.png (335,625) 10-12-2025 04:40
http://www.sasgis.org/mantis/file_download.php?file_id=2653&type=bug
? 121003.mp4 (1,549,301) 10-12-2025 04:45
http://www.sasgis.org/mantis/file_download.php?file_id=2654&type=bug
Issue History
Date ModifiedUsernameFieldChange
09-12-2025 04:57qq117511New Issue
09-12-2025 09:10zedNote Added: 0020568
09-12-2025 09:19zedNote Edited: 0020568bug_revision_view_page.php?bugnote_id=20568#r7915
10-12-2025 04:35qq117511File Added: 12月10日.mp4
10-12-2025 04:39qq117511Note Added: 0020569
10-12-2025 04:40qq117511File Added: ScreenShot_2025-12-10_124042_409.png
10-12-2025 04:45qq117511File Added: 121003.mp4
10-12-2025 04:51qq117511Note Added: 0020570
10-12-2025 07:54zedRelationship addedduplicate of 0002686
10-12-2025 07:58zedNote Added: 0020571
10-12-2025 07:59zedSummaryMap flickers while dragging in sas.planet => Map flickers while zooming
16-12-2025 04:26qq117511Note Added: 0020572
16-12-2025 05:46zedNote Added: 0020573
16-12-2025 05:55zedNote Edited: 0020573bug_revision_view_page.php?bugnote_id=20573#r7917
21-12-2025 16:22zedNote Added: 0020574
24-12-2025 02:37qq117511Note Added: 0020576
25-12-2025 10:30zedNote Added: 0020578
31-12-2025 14:01zedStatusnew => closed
31-12-2025 14:01zedAssigned To => zed
31-12-2025 14:01zedResolutionopen => duplicate

Notes
(0020568)
zed   
09-12-2025 09:10   
(edited on: 09-12-2025 09:19)
Can you record a video?

Are there any hardware issues (CPU, RAM, HDD)? Does the nightly version behave the same way? Could you check if any older version works correctly?

Windows 7 is a fairly old system, but I periodically test the program in a virtual machine running Windows XP and Windows 7 and have never encountered the problem you described.

Regarding redrawing, the program does indeed completely refresh the image when the map is moved; there's no other way. This is done using the CPU. But it usually happens very quickly.

You can look at the specific numbers in the debug version of the program: View - Debug Info and specify the ViewState;OnPaint;OneTilePaintSimple filter. See what values ​​you have there?
(0020569)
qq117511   
10-12-2025 04:39   
I tested this on a 5080 GPU under Windows 11. At first I thought it was the latency from fetching data over the internet. But even after the files were cached locally, the flickering was still very obvious—really noticeable.
(0020570)
qq117511   
10-12-2025 04:51   
9950X
5080
32G
win11
(0020571)
zed   
10-12-2025 07:58   
Ah, it's not dragging, but zooming! Yes, there is a long standing bug with flickering on zoom change. And I have no idea how to fix it.
(0020572)
qq117511   
16-12-2025 04:26   
v.211230 does not have this problem.
(0020573)
zed   
16-12-2025 05:46   
(edited on: 16-12-2025 05:55)
Place your cache on the old, slow HDD and test it again...

I'm going to try to implement a couple of ideas soon that might help get rid of this effect. Stay tuned.
(0020574)
zed   
21-12-2025 16:22   
Try out the nightly build, it works much better now. For me, it's not quite perfect yet, but close to it.
(0020576)
qq117511   
24-12-2025 02:37   
great!
(0020578)
zed   
25-12-2025 10:30   
I've added a couple more fixes, and now it works as expected. Please test the nightly build and report back if you find anything. If all is well, I will close this ticket in a few days as a duplicate of an earlier one.