When the user clicks and drags to mark a selection on the x axis, the default zoom operation is cancelled, and instead an Ajax request is sent to the server for new, higher resolution data within the selected area.
Below is the contents of the file drilldown-data.php. In most real world
cases the data would be fetched from a database with a query to select all
values between min and max.
<?php
$data = array(
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1227744000 => 0.771,
1227830400 => 0.775,
1227916800 => 0.7791,
1228003200 => 0.7882,
1228089600 => 0.7882,
1228176000 => 0.7899,
1228262400 => 0.7905,
1228348800 => 0.7889,
1228435200 => 0.7879,
1228521600 => 0.7855,
1228608000 => 0.7866,
1228694400 => 0.7865,
1228780800 => 0.7795,
1228867200 => 0.7758,
1228953600 => 0.7717,
1229040000 => 0.761,
1229126400 => 0.7497,
1229212800 => 0.7471,
1229299200 => 0.7473,
1229385600 => 0.7407,
1229472000 => 0.7288,
1229558400 => 0.7074,
1229644800 => 0.6927,
1229731200 => 0.7083,
1229817600 => 0.7191,
1229904000 => 0.719,
1229990400 => 0.7153,
1230076800 => 0.7156,
1230163200 => 0.7158,
1230249600 => 0.714,
1230336000 => 0.7119,
1230422400 => 0.7129,
1230508800 => 0.7129,
1230595200 => 0.7049,
1230681600 => 0.7095
);
// convert to Unix timestamp
$min = round($_GET['min']/1000);
$max = round($_GET['max']/1000);
// build a twodimensional array of data items between min and max
$newData = array();
foreach ($data as $key => $value) {
if ($key > $min && $key < $max) {
$newData[] = array($key * 1000, $value);
}
}
// json-encode it and send it to the client
echo json_encode($newData);
?>