[Marble-bugs] [Bug 288297] New: marble displays gpx points in a flickery/unreliable fashion

[Vincent de Phily]

https://bugs.kde.org/show_bug.cgi?id=288297

           Summary: marble displays gpx points in a flickery/unreliable
                    fashion
           Product: marble
           Version: unspecified
          Platform: Gentoo Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: marble-bugs at kde.org
        ReportedBy: moltonel at gmail.com


Version:           unspecified (using KDE 4.7.3) 
OS:                Linux

When loading a gpx file with a lot of named points (for example geocaching, not
tracks), there are "holes" at certain zoom levels where no point is displayed
although there is ample space for that. Zooming and/or panning will make marble
display a different "selection" of points.

Secondly, while panning around the points flicker horribly, and the associated
labels move around the points a lot.

Reproducible: Always

Steps to Reproduce:
Load attached file in marble. Zoom in to view most, but not all of Ireland. Pan
from the north-east to the south-west. Experiment with more panning and
zooming.

Actual Results:  
* Many points appear/disappear when panning.
* Rendering flickers a lot.

Expected Results:  
* Display as many points as possible without overlapping labels/icons for the
current zoom level.
* Make rendering flicker-free.
* Make the algorythm of "which points to display and where to place labels when
map is overcrowded" more stable (ideally shouldn't be affected by panning).

I guess there is a hardcoded limit of points to display at once on the map, and
that is what is causing the appearing/disappearing points ? If so, consider
removing that limit altogether because :
* It is a serious usability issue, having to pan around to make sure I saw all
the points.
* It seems not to be needed for performance reasons, as there is no noticeable
speed difference with and without the points loaded on my modest desktop
hardware.
* There is already a dynamic limit to the number of points displayer at once,
courtesy of the "avoid-overcrowding" algorythm.

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