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/