[Digikam-devel] [Bug 103645] zoom in with rectangle tool selection

[Arnd Baecker]

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http://bugs.kde.org/show_bug.cgi?id=103645         




------- Additional Comments From arnd.baecker web de  2007-03-21 13:43 -------
Maybe the following would be a simple solution:
introduce a new (user-changeable) zoom_factor, by which
the magnification gets multiplied (divided by): 
E.g. with zoom_factor=1.4 using the mousewheel for zooming would lead
to the sequence
 100%  140% 196% 274%  384% ...
and in the other direction: 
  71%  51%  36% ...

Technical remark: If the actual zoom-level is just an integer percentage, 
going up and down will lead to rounding errors. This could be prevented
by pre-generating the sequence of zoom-levels as
100% * zoom_factor**zoom_value, e.g with  zoom_value = -10, -9, ..., 10
(With zoom_factor=1.4 this covers the range from 3% to 2892%,
while with zoom_factor=1.1 this would only be 38% to 260%;
so maybe the range of zoom_value should be made dependent on the zoom_factor,
so that always a range of 10% to 1000% is covered?)