[Bug 202332] New: View mode: Zooming using Ctrl+Scroll is broken

[Michael Holtermann-3]

https://bugs.kde.org/show_bug.cgi?id=202332

           Summary: View mode: Zooming using Ctrl+Scroll is broken
           Product: digikam
           Version: unspecified
          Platform: Debian testing
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: [hidden email]
        ReportedBy: [hidden email]


Version:            (using KDE 4.2.4)
OS:                Linux
Installed from:    Debian testing/unstable Packages

Hello,

in view mode, it's possible to zoom the image using Ctrl+Scroll. This works
well for horizontal aligned images, but not for vertical aligned images.

In edit mode, it works for both alignments.

Greetings,
Michael.

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[Marcel Wiesweg]

https://bugs.kde.org/show_bug.cgi?id=202332


Marcel Wiesweg <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED




--- Comment #1 from Marcel Wiesweg <marcel wiesweg gmx de>  2009-08-04 15:18:01 ---
SVN commit 1006803 by mwiesweg:

There is a problem using floor(x*10000)/10000 to reduce precision.
For values like 0.50149999999999996 this operation will subtract 1/10000 for
every
run (5014 -> 5013 -> 5012...). It's not mathematical correct but floating point
arithmetics on a computer are not mathematically correct sometimes.
If such a value is calculated for fit-to-window as 5014 and truncated to 5013
it will be set by setZoomFactor as 5012.
Now snapZoom() is fooled when the current zoom is 5012 and the desired one is
0.6,
it will snap to 5013 (set as 5012 - and forever again) disabling any zooming.

Using round(x*10000)/10000 instead of floor solves the problem for me.

BUG: 202332

 M  +3 -1      NEWS  
 M  +2 -2      libs/widgets/common/previewwidget.cpp  


WebSVN link: http://websvn.kde.org/?view=rev&revision=1006803

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[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=202332


Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|general                     |Albums GUI
            Version|unspecified                 |1.0.0




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