[ka-Map-users] PNG transparency in IE - some conclusions

Fri Apr 28 09:45:42 EDT 2006

Ehud,

Paul already answered your question. You can change layer
opacity in the mapfile, so the ka-Map loads with a pre-setted
value. You can set this by metadata "opacity" value, like:

METADATA
  "opacity"    "80"
END

But this works only in Firefox until now. In IE, even if
you set this value, the ka-Map starts with no transparency.
The problem I related in last email occurs when you try to
change layer's opacity in Ka-Map's legend menu.

But, as I said, you are in right way! Congratulations again!

regards,

Pedro Garcia.

2006/4/28, Ehud Shabtai <eshabtai at gmail.com>:
>
> On 4/28/06, Paul Spencer <pspencer at dmsolutions.ca> wrote:
>
> > sorry for the delay, I've applied your patches to cvs.
>
> Thanks Paul.
>
> > The opacity metadata changes the opacity of the layer using CSS in
> > the client rather than in mapserver.
>
> Thanks for the tip, I'll see if I can figure out why lines are
> disappearing when opacity is used.
>
> > On 28-Apr-06, at 2:52 AM, Ehud Shabtai wrote:
> >
> > > I think these changes should be merged to CVS. They only affect layers
> > > with "imageformat = alpha", so I don't expect any regressions.
> > >
> > > Paul, what do you think?
> > >
> > > Pedro, how do you change the layer opacity? Through the map file?
> > >
> > > On 4/28/06, Pedro Garcia <pedro.gspace at gmail.com> wrote:
> > >> Ehud,
> > >>
> > >> Congratulations!!! PNG24 transparency is working in IE!!!
> > >> I tested in:
> > >>   * Windows XP SP2
> > >>   * IE 6.0
> > >>   * Firefox 1.5
> > >>   * ka-Map latest CVS version
> > >>
> > >> I tested with a map with 2 layers:
> > >>   1) A Ikonos raster image with 4m pixel resolution;
> > >>   2) A vector polygonal layer with labels and two
> > >>      metadata info, as you can see:
> > >>
> > >>     NAME "shpBairros"
> > >>     GROUP "Bairros"
> > >>     STATUS ON
> > >>     DATA "/ms4w/apps/MapaVix/Shapes/Bairros.shp"
> > >>     TYPE POLYGON
> > >>     UNITS METERS
> > >>     SIZEUNITS PIXELS
> > >>     LABELITEM "Text"
> > >>     TOLERANCE 0
> > >>     TOLERANCEUNITS PIXELS
> > >>     METADATA
> > >>       "imageformat"    "ALPHA"
> > >>       "opacity"    "80"
> > >>     END
> > >>
> > >> OBS: The full mapfile is attached.
> > >>
> > >> I can test it in Windows 2000 late.
> > >>
> > >>  Take a long time to translate your diffs to my local copy
> > >> to test it, so I'm attaching the modified files so others
> > >> can test it more easily.
> > >>
> > >> But I found a problem: when I try to change the vector layer
> > >> transparency, the layer disappears, but if I turn of, and turn
> > >> on after, the layer appears again. But I think you're going
> > >> in the right direction to the solution. Congratulations again,
> > >> with your code whe are next to solve the most critical
> > >> issue in ka-Map portability in my opinion.
> > >>
> > >> I'm attached 2 sreenshots, 1 with Firefox and other with IE,
> > >> and you can see clearly the transparency.
> > >>
> > >> regards,
> > >>
> > >> Pedro Garcia.
> > >>
> > >> 2006/4/11, Ehud Shabtai <eshabtai at gmail.com>:
> > >>>
> > >>  Jacob,
> > >>
> > >> I can't reproduce it.
> > >>
> > >> I'm using IE 6.0 which version do you use?
> > >>
> > >> Ehud.
> > >>
> > >> On 4/11/06, Delfos, Jacob <jacob.delfos at maunsell.com> wrote:
> > >>> Ehud,
> > >>>
> > >>> During panning, the whole map sometimes turns black. As soon as I
> > >>> let go
> > >>> of the mouse, it becomes normal again. Sometimes if I let go of the
> > >>> mouse before it turns black, it becomes black once it finishes
> > >>> loading,
> > >>> and turns normal when I press the mouse down.
> > >>>
> > >>> Also, when turning the satellite image off, and then on again, the
> > >>> entire page turns black once it has finished loading (see attached
> > >>> screenshot). This only happens in IE. Is it to do with the
> > >>> application
> > >>> of the PNG-hack?
> > >>>
> > >>> Regards,
> > >>>
> > >>> Jacob
> > >>>
> > >>>
> > >>>> -----Original Message-----
> > >>>> From: ka-map-users-bounces at lists.maptools.org
> > >>>> [mailto:ka-map-users-bounces at lists.maptools.org] On
> > >> Behalf Of
> > >>>> Ehud Shabtai
> > >>>> Sent: 11 April 2006 14:57
> > >>>> To: Shoaib Burq
> > >>>> Cc: ka-Map-users at lists.maptools.org
> > >>>> Subject: Re: [ka-Map-users] PNG transparency in IE - some
> > >>>> conclusions
> > >>>>
> > >>>
> > >>>
> > >>>
> > >>
> > >>
> > >> --
> > >> Ehud Shabtai
> > >> http://www.freemap.co.il/map/
> > >>
> > >> _______________________________________________
> > >> ka-Map-users mailing list
> > >>  ka-Map-users at lists.maptools.org
> > >> http://lists.maptools.org/mailman/listinfo/ka-map-users
> > >>
> > >>
> > >>
> > >
> > >
> > > --
> > > Ehud Shabtai
> > > http://www.freemap.co.il/map/
> >
> > +-----------------------------------------------------------------+
> > |Paul Spencer                           pspencer at dmsolutions.ca   |
> > +-----------------------------------------------------------------+
> > |Applications & Software Development                              |
> > |DM Solutions Group Inc                 http://www.dmsolutions.ca/|
> > +-----------------------------------------------------------------+
> >
> >
> >
> >
> >
>
>
> --
> Ehud Shabtai
> http://www.freemap.co.il/map/
>
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