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<DIV><FONT face=Arial size=2>Thanks Paul,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>I sort of got it working now. My problem was that I
didn't realize I was passing parameters into the main php page, which of course
wouldn't propagate to drawmap.php (dumb...).</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>I'm automatically generating a hidden input field
in the form when my aerial photo becomes visible (using the legend template).
Unfortunately it doesn't get picked up until the next time I submit the form. I
may try to resort to iterating through the layers after all. I think it could be
a real advantage to switch to indexed colour (GIF) automatically when there is
only vector data visible.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Thanks,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Jacob</FONT></DIV>
<DIV> </DIV><FONT face=Arial size=2>
<DIV><BR>-----Original Message-----<BR>From: Paul Spencer
[mailto:pagameba@magma.ca] <BR>Sent: 23 August 2004 20:31<BR>To: Jacob
Delfos<BR>Cc: <A
href="mailto:chameleon@lists.maptools.org">chameleon@lists.maptools.org</A><BR>Subject:
Re: [Chameleon] change imagetype on the fly</DIV>
<DIV> </DIV>
<DIV><BR>$http_form_vars is either POST or GET, not both. You could
try:</DIV>
<DIV> </DIV>
<DIV>$http_form_vars = array_merge( $_POST, $_GET );</DIV>
<DIV> </DIV>
<DIV>You can also:</DIV>
<DIV> </DIV>
<DIV>print_r($http_form_vars);</DIV>
<DIV> </DIV>
<DIV>and then view the source of your image to see the contents of the
array?</DIV>
<DIV> </DIV>
<DIV>Cheers,</DIV>
<DIV> </DIV>
<DIV>Paul</DIV>
<DIV> </DIV>
<DIV>Jacob Delfos wrote:</DIV>
<DIV> </DIV>
<DIV>> Paul,<BR>> <BR>> You are right, if I hardcode the
szImgType variable, it changes the <BR>> imagetype. But it doesn't seem to
want to change any other way. There is <BR>> this piece of code in there
which doesn't seem to have any effect:<BR>> <BR>> if
(isset($http_form_vars["gszImgType"]) && <BR>>
$http_form_vars["gszImgType"] != "")<BR>> $szImgType
= $http_form_vars["gszImgType"];<BR>> <BR>> The way I see this, it
should allow a parameter in the form called <BR>> gszImgType to override the
imagetype. Why doesn't it work? Even if I <BR>> just try<BR>>
<BR>> isset($http_form_vars["gszImgType"])<BR>> <BR>> and place
the gszImgType in the url as a parameter, or in the form as an <BR>> input
type, it acts as if this variable isn't set. I'm not much of a php <BR>>
expert, but I thought the isset function checks whether a parameter has <BR>>
a value.....<BR>> <BR>> Is it because I use a mapfile?<BR>>
<BR>> regards,<BR>> <BR>> Jacob<BR>> <BR>>
<BR>> <BR>> <BR>> -----Original Message-----<BR>> From:
Paul Spencer [mailto:pagameba@magma.ca]<BR>> Sent: 19 August 2004
10:09<BR>> To: Jacob Delfos; <A
href="mailto:chameleon@lists.maptools.org">chameleon@lists.maptools.org</A>
<BR>> <<A
href="mailto:chameleon@lists.maptools.org">mailto:chameleon@lists.maptools.org</A>><BR>>
Subject: Re: [Chameleon] change imagetype on the fly<BR>> <BR>>
<BR>> Jacob, you should be able to modify the image type in drawmap.php since
<BR>> this is the only<BR>> place that it actually draws the map.
Note that drawmap does not save <BR>> the map state, so<BR>> you would
have to change it on every map draw. The code would look <BR>>
something like:<BR>> <BR>> $oMap->selectOutputFormat( 'GIF'
);<BR>> <BR>> I think. And you could insert this just before
the $oMap->draw(); <BR>> call. You could also<BR>> (at the risk
of adding a little overhead) loop through all the layers in <BR>> the map and
test<BR>> for the layer types and only switch to jpeg when a raster layer is
<BR>> visible ...<BR>> <BR>> Cheers,<BR>> <BR>>
Paul<BR>> <BR>> <BR>> <BR>> On Aug 18, "Jacob
Delfos" <<A
href="mailto:jacob.delfos@maunsell.com">jacob.delfos@maunsell.com</A> <BR>>
<<A
href="mailto:jacob.delfos@maunsell.com">mailto:jacob.delfos@maunsell.com</A>>>
wrote:<BR>> > Hi List,<BR>> ><BR>>
><BR>> ><BR>> > I am attempting to modify chameleon
to allow the imagetype to change <BR>> on the fly.<BR>> Ideally, I want to
reach a situation where chameleon is smart enough to <BR>> know it should
use<BR>> gif, except when an aerial photograph is in the background. This
will <BR>> greatly increase the<BR>> speed of the page, because my jpeg
maps are typically around 88kb, <BR>> whereas a gif would be<BR>> ten
times smaller for linework and areas.<BR>> ><BR>>
><BR>> ><BR>> > I tried to override the nImageType in
drawmap.php by making it pick <BR>> it up from the http<BR>> parameters.
But even if I hardcode the nImageType variable, I keep <BR>> getting a jpeg.
Also<BR>> (which may be the cause), the temporary map files that are created
<BR>> specify jpeg as imagetype.<BR>> ><BR>>
><BR>> ><BR>> > If I want to override the imagetype,
where do I change that?<BR>> ><BR>> ><BR>>
><BR>> > regards,<BR>> ><BR>>
><BR>> ><BR>> > Jacob<BR>>
><BR>> ><BR>> ><BR>> ><BR>>
><BR>> ><BR>> ><BR>> > JACOB
DELFOS<BR>> ><BR>> > SPATIAL INFORMATION
ANALYST<BR>> ><BR>> > Maunsell Australia Pty
Ltd<BR>> ><BR>> > 629 Newcastle Street<BR>>
><BR>> > PO Box 81<BR>> ><BR>> >
Leederville 6902<BR>> ><BR>> > Western
Australia<BR>> ><BR>> > ABN 20 093 846 925<BR>>
><BR>> ><BR>> ><BR>> >
Tel + 61 8 9281 6185<BR>> ><BR>>
> Fax + 61 8 9281 6297<BR>> ><BR>>
> <A href="mailto:jacob.delfos@maunsell.com">jacob.delfos@maunsell.com</A>
<<A
href="mailto:jacob.delfos@maunsell.com">mailto:jacob.delfos@maunsell.com</A>><BR>>
><BR>> >
_______________________________________________<BR>> > Chameleon
mailing list<BR>> > <A
href="mailto:Chameleon@lists.maptools.org">Chameleon@lists.maptools.org</A>
<<A
href="mailto:Chameleon@lists.maptools.org">mailto:Chameleon@lists.maptools.org</A>><BR>>
> <a<BR>>
href='http://lists.maptools.org/mailman/listinfo/chameleon'>http://lists.maptools.org/mailman/listinfo/chameleon</a><BR>>
><BR>> ><BR>> <BR>> if
(isset($http_form_vars["gszImgType"]) && <BR>>
$http_form_vars["gszImgType"] != "")<BR>> $szImgType
= $http_form_vars["gszImgType"];<BR>> <BR>> <BR>>
------------------------------------------------------------------------<BR>>
<BR>> _______________________________________________<BR>> Chameleon
mailing list<BR>> <A
href="mailto:Chameleon@lists.maptools.org">Chameleon@lists.maptools.org</A><BR>>
<A
href="http://lists.maptools.org/mailman/listinfo/chameleon">http://lists.maptools.org/mailman/listinfo/chameleon</A></DIV>
<DIV> </DIV>
<DIV>-- <BR>
-----------------------------------------------------------------<BR>|Paul
Spencer
<A href="mailto:pspencer@dmsolutions.ca">pspencer@dmsolutions.ca</A>
|<BR>|-----------------------------------------------------------------|<BR>|Applications
& Software
Development
|<BR>|DM Solutions Group
Inc
<A href="http://www.dmsolutions.ca/">http://www.dmsolutions.ca/</A>|<BR>
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