/**
* Given index of a mosaic image, and a pixel position on that image handle a zoom
* If the zoom level is 2, this needs to perform a redirect to the gridsquare page
* otherwise, it reconfigures the instance for the zoomed in map
* @access public
*/
function zoomIn($i, $j, $x, $y)
{
//so where did we click?
list($clickx, $clicky) = $this->getClickCoordinates($i, $j, $x, $y);
$zoomindex = array_search($this->pixels_per_km, $this->scales);
if ($zoomindex === FALSE) {
$zoomindex = 0;
}
$zoomindex++;
if ($zoomindex > count($this->scales) || $this->pixels_per_km > 40) {
//we're going to zoom into a grid square
$square = new GridSquare();
if ($square->loadFromPosition($clickx, $clicky)) {
$images = $square->getImages(false, '', 'order by moderation_status+0 desc,seq_no limit 2');
//if the image count is 1, we'll go straight to the image
if (count($images) == 1) {
$url = "http://" . $_SERVER['HTTP_HOST'] . '/photo/' . $images[0]->gridimage_id;
} else {
//lets go to the grid reference
$url = "http://" . $_SERVER['HTTP_HOST'] . '/gridref/' . $square->grid_reference;
}
} else {
require_once 'geograph/conversions.class.php';
$conv = new Conversions();
list($gr, $len) = $conv->internal_to_gridref($clickx, $clicky, 0);
$url = "http://" . $_SERVER['HTTP_HOST'] . '/gridref/' . $gr;
}
header("Location:{$url}");
exit;
} else {
$scale = $this->scales[$zoomindex];
}
//store the clicked position to make a better estimate at the required grid
$this->old_centrex = $clickx;
$this->old_centrey = $clicky;
//size of new map in km
$mapw = $this->image_w / $scale;
$maph = $this->image_h / $scale;
//here's the perfect origin
$bestoriginx = $clickx - $mapw / 2;
$bestoriginy = $clicky - $maph / 2;
$this->setScale($scale);
$this->setMosaicFactor(2);
$this->setAlignedOrigin($bestoriginx, $bestoriginy);
}
