[Chameleon] Report the correct map scale

[Abe Gillespie]

Hmm ... ok, that's disappointing.  I did try other things like just
drawing a single layer or prepareImage().  Those didn't seem to work.

I will file a bug report.  Is there anything else I could do?

-Abe

On 8/9/05, Paul Spencer <pspencer at dmsolutions.ca> wrote:
> Abe,
> 
> this is actually not a bug, believe it or not!  I'm not sure if it is
> part of the documentation, but this has been the 'way it works' forever,
> much to my dismay.  You may also be able to call less-expensive
> functions such as $map->prepareImage(); to force the same thing.
> 
> Please try to get Daniel to change this,  I haven't had much luck
> convincing him :>
> 
> Paul
> 
> Abe Gillespie wrote:
> > No, it's not with the JSAPI.  I found out it is a bug in MapScript
> > itself.  Apparently the map object's scale is not updated until a draw
> > is performed.  The following code is a work around:
> >
> > $img = $map->draw();
> > $img->free();
> >
> > After this the scale is what it should be.  I'll have to tell the
> > MapServer folks when I get the chance.
> >
> > -Abe
> >
> > On 8/9/05, Bart van den Eijnden <BEN at syncera-itsolutions.nl> wrote:
> >
> >>Abe,
> >>
> >>are you in JSAPI mode or not?
> >>
> >>I fixed a similar problem a few months  ago, maybe you can check this bug report, the solution might also apply to your problem:
> >>
> >>http://bugzilla.maptools.org/show_bug.cgi?id=1030
> >>
> >>Best regards,
> >>Bart
> >>
> >>Bart van den Eijnden
> >>Syncera IT Solutions
> >>Postbus 270
> >>2600 AG  DELFT
> >>
> >>tel.nr.: 015-7512436
> >>email: BEN at Syncera-ITSolutions.nl
> >>
> >>
> >>>>>Abe Gillespie <abe.gillespie at gmail.com> 08/08/05 11:10pm >>>
> >>
> >>I'm having an issue getting the current map scale during widget load.
> >>If I debug write out the scale of the map for the ZoomIn widget it's
> >>always one step behind.  The following dump is from first loading the
> >>page through two subsequent zoom-ins:
> >>
> >>Initial page load>
> >>ZoomIn::ParseURL
> >>pre-zoom scale: 432308.993166
> >>
> >>First zoom in>
> >>ZoomIn::ParseURL
> >>pre-zoom scale: 432308.993186
> >>post-zoom scale: 432308.993186
> >>
> >>Second zoom in>
> >>ZoomIn::ParseURL
> >>pre-zoom scale: 102414.886918
> >>post-zoom scale: 102414.886918
> >>
> >>Things to note:
> >>1.  Initial page load doesn't have the "post-zoom" line because no
> >>zooming was done.
> >>2.  At first zoom in you see the scale is the same as when the page is
> >>initially loaded (before AND after the actual zoom).
> >>3.  At second zoom the scale has finally changed ... but this is
> >>actually what the scale should have been reported for the post-zoom
> >>line of the first zoom.
> >>
> >>Now the widget I'm creating is experiencing the same problems and
> >>needs the current correct scale to function properly.
> >>
> >>Any ideas?
> >>Thanks.
> >>-Abe
> >>
> >>_______________________________________________
> >>Chameleon mailing list
> >>Chameleon at lists.maptools.org
> >>http://lists.maptools.org/mailman/listinfo/chameleon
> >>
> >>
> >
> >
> > _______________________________________________
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> > Chameleon at lists.maptools.org
> > http://lists.maptools.org/mailman/listinfo/chameleon
> >
> 
> --
> +-----------------------------------------------------------------+
> |Paul Spencer                           pspencer at dmsolutions.ca   |
> +-----------------------------------------------------------------+
> |Applications & Software Development                              |
> |DM Solutions Group Inc                 http://www.dmsolutions.ca/|
> +-----------------------------------------------------------------+
>