/**
* get a token that will zoom us one level into this mosaic
* @access public
*/
function getZoomInToken()
{
$out = new GeographMapMosaic();
$zoomindex = array_search($this->pixels_per_km, $this->scales);
if ($zoomindex === FALSE) {
$zoomindex = 0;
}
$zoomindex++;
if ($zoomindex <= count($this->scales)) {
//figure out central point
$centrex = $this->map_x + $this->image_w / $this->pixels_per_km / 2;
$centrey = $this->map_y + $this->image_h / $this->pixels_per_km / 2;
$scale = $this->scales[$zoomindex];
$out->setScale($scale);
$out->setMosaicFactor(2);
$out->type_or_user = $this->type_or_user;
//figure out what the perfect origin would be
$mapw = $this->image_w / $scale;
$maph = $this->image_h / $scale;
$bestoriginx = $centrex - $mapw / 2;
$bestoriginy = $centrey - $maph / 2;
$out->setAlignedOrigin($bestoriginx, $bestoriginy);
return $out->getToken();
} else {
return FALSE;
}
}