The code that you included in your last email seems to be missing the
stuff that handles the zoom. i.e. a comment suggests that you create a
$extent_obj for this, which is either initialized from the values in the
$extent[] array, or from the $map->extents which have just been set from
the contents of the $extent[] array, so in both case you get more or
less the same result minus the width/height ratio adjustment that
MapServer does automatically on $map->setExtent()... and there is
nothing to adjust the extents to reflect the last zoom operation and
pass that to $map->setExtents().
What does the $extent[] array contain when this code starts being
executed? Is it the extents before or after applying the zoom?
Daniel
percy wrote:
Thanks Daniel, but I've been testing this pretty hard as you can see
from the code snippet below (testing parts are commented out). The
layers are getting turned on and off correctly in the section right
before the call to processlegendtemplate...
$map = ms_newMapObj($mymap);
if ($extent['x1'] && $extent['y1'] &&
$extent['x2'] && $extent['y2']) {
// set the extent
$map->setExtent($extent['x1'], $extent['y1'], $extent['x2'],
$extent['y2']);
// set up extent object for use in zoom (!?!?)
$extent_obj = ms_newRectObj();
$extent_obj->setExtent($extent['x1'], $extent['y1'],
$extent['x2'], $extent['y2']);
} else {
$extent_obj = ms_newRectObj();
$extent_obj->setExtent ($map->extent->minx, $map->extent->miny,
$map->extent->maxx, $map->extent->maxy);
}
//now handle turning the layers on or off
if (count($layers)>0) {
//echo "I see more than 0 layers\n";
for ($i=0; $i<$map->numlayers; ++$i) {
$oLayer=$map->getLayer($i);
// echo "got layer number".$i;
if (in_array($oLayer->name,$layers)) {
$oLayer->set("status",MS_ON);
// echo "turning on layer ".$oLayer->name;
// echo $oLayer->status;
} else {
$oLayer->set("status",MS_OFF);
// echo "turning OFF layer ".$oLayer->name;
}
}
}
$my_html=$map->processLegendTemplate(null);
//echo $_SERVER['QUERY_STRING'];
echo $my_html;
Daniel Morissette wrote:
percy wrote:
When you zoom in on the map, the scale dependencies all work great
for the map, but the legend is always out of whack. I am using
php/mapscript to generate a processlegendtemplate() request. For
debugging this issue, I have also tried just a straight drawlegend()
request and I get similarly odd behavior. The geologic faults, which
are set to show up at a scale of 1:500,000 don't show up in the
legend until zoomed in to around 1:100,000. (though sometimes if I
zoom in small increments, they'll show up sooner...)
The problem could be related to the order in which you make calls in
your PHP script. The legend object uses the last calculated scale in
its tests to decide which layer/classes to include in the legend, so
if you call processlegendtemplate() before the extents and scale have
been updated to reflect the last zoom operation then you could get
this kind of behavior.
I just did a quick check in the code and $map->setExtent() does update
the scale value, so if you call that with the right extents before
processing the legend then you should be fine.
Daniel
--
Daniel Morissette
http://www.mapgears.com/
