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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>More info:</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I’ve realized I’ve said this
part wrong:</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-US
style='font-size:12.0pt'>After I’ve initialized the new map, the KeyMap
object is empty. I can’t figure out where its values are supposed to be
coming from, but when the KeyMap constructor is run after I’ve
initialized the new map, everything is empty.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>When I CWCInitialize() the new map, a new KeyMap
is constructed and has the values sent within the HTML. At the end of its SetMap
function, the properties are all set properly. Where it appears “empty”,
is in “drawmap.php” when it comes time to DrawKeyMap(). None of the
$http_form_vars are set (if (isset($http_form_vars['nWidth'])…), so the
second block of code is run. That is, the following code is run to DrawKeyMap():</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> elseif (isset(
$_SESSION["KEYMAP_SRS"] ) )</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> {</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
/*</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
echo "drawReferenceMap:<BR>";</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
print_r($oMapSession->oMap);</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
print_r($oMapSession->oMap->reference);</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
*/</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
$oRef = $oMapSession->oMap->reference;</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
DrawKeyMap( $oMapSession, $oRef->width, $oRef->height,</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
$oRef->image, $oRef->extent->minx, $oRef->extent->miny,</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
$oRef->extent->maxx, $oRef->extent->maxy,</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
$_SESSION["KEYMAP_SRS"],</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
($oRef->color->red)." ".($oRef->color->green)."
".($oRef->color->blue),</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
($oRef->outlinecolor->red)." ".($oRef->outlinecolor->green)."
".($oRef->outlinecolor->blue) );</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
return;</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> }</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>It is here that the Map object’s
reference is empty. There is an object in the reference property, there is just
no data stored in it besides its defaults (like width and height = 0). So, the KeyMap
object is being created properly, it’s just not being linked to the
current oMapSession/oMap in drawmap.php, somehow.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I hope this makes the problem I am having clearer.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>jtm</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Tahoma><span
lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>-----Original
Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> McGraw, Joanne <br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, June 10, 2005 11:13
AM<br>
<b><span style='font-weight:bold'>To:</span></b> 'chameleon@lists.maptools.org'<br>
<b><span style='font-weight:bold'>Subject:</span></b> switching mapfiles at
runtime</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
lang=EN-US style='font-size:12.0pt'>Good day All,</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
lang=EN-US style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
lang=EN-US style='font-size:12.0pt'>I have hit the 50 layer limitation in a
MapServer application I am currently working on. While I realize I can
recompile MapServer to increase this value, I’ve found that in
approaching 50 layers I have noticed a reduction in performance (not drastic,
but enough) during loading and re-drawing, etc., so I would prefer to split up
the layers into separate maps based on categories of data. Depending on what
data the user wishes to review, the appropriate map will be loaded up.</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
lang=EN-US style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
lang=EN-US style='font-size:12.0pt'>I’ve created a widget that appears as
a drop-down SELECT and within the ParseURL am trying to change the
application’s map. I can do this by calling CWCInitialize on the current
application:</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
lang=EN-US style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
lang=EN-US style='font-size:12.0pt'>$oApp = GetChameleonApplication();</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
lang=EN-US style='font-size:12.0pt'>$oApp->CWCInitialize($oApp->mszTemplate,
$szFullPath2NewMapFile);</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
lang=EN-US style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
lang=EN-US style='font-size:12.0pt'>Understandably, this does not reset things
in all the other Chameleon widgets. For example, I can easily get the current
map’s extents before initializing the new map and reset them on the new
map afterwards but, the KeyMap (and, I’m sure others as well) is
trickier. After I’ve initialized the new map, the KeyMap object is empty.
I can’t figure out where its values are supposed to be coming from, but
when the KeyMap constructor is run after I’ve initialized the new map,
everything is empty.</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
lang=EN-US style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
lang=EN-US style='font-size:12.0pt'>So, I’ve come to the conclusion that
simply calling CWCInitialize in the middle of a process is not a good idea.
What is a better approach for a person to go about changing the map within the
running of an application?</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
lang=EN-US style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
lang=EN-US style='font-size:12.0pt'>Cheers,</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
lang=EN-US style='font-size:12.0pt'>jtm</span></font></p>
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