[Chameleon-dev] [Bug 1030] New: scale not updated correctly in jsapi mode

[bugzilla-daemon at maptools.org]

http://www.maptools.org/bugzilla/show_bug.cgi?id=1030

           Summary: scale not updated correctly in jsapi mode
           Product: Chameleon
           Version: 2.2
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Core
        AssignedTo: chameleon-dev at lists.maptools.org
        ReportedBy: bartvde at xs4all.nl


The scale used for the Scale widget always lags behind one zoom action. The
problem is both in 2.0.1 as in 2.2 beta.

Okay, finally tracked this one down with Paul's help.

The problem was in UpdateMap.php (BuildHTMLOutputMapExtentsChanged function)
with Mapscript not updating the $oMap->scale correctly, only after a call to
draw() it would update but that's quite inefficient.

So we ended up calculating the scale in PHP instead.

$inchesPerUnit = array(1, 12, 63360.0, 39.3701, 39370.1, 4374754);
$mnScale =
(($oMap->extent->maxx-$oMap->extent->minx)*$oMap->resolution*$inchesPerUnit[$oMap->units])/($oMap->width);

$szResult .= "<input type=\"hidden\" name=\"MAP_SCALE\" value=".$mnScale."> <br>\n";



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