/home/desid573/public_html/tollster
Edit: /home/desid573/public_html/tollster/encoder.php (2662B)
points = array();
}
/**
* Add a point
*
* @param float $lat : lattitude
* @param float $lng : longitude
*/
function addPoint($lat, $lng) {
if (empty($this->points)) {
$this->points[] = array('lat' => $lat, 'lng' => $lng);
$this->encoded = $this->encodeValue($lat) . $this->encodeValue($lng);
} else {
$n = count($this->points);
$prev_p = $this->points[$n-1];
$this->points[] = array('lat' => $lat, 'lng' => $lng);
$this->encoded .= $this->encodeValue($lat-$prev_p['x']) . $this->encodeValue($lng-$prev_p['y']);
}
}
/**
* Return the encoded string generated from the points
*
* @return string
*/
function encodedString() {
return $this->encoded;
}
/**
* Encode a value following Google Maps API v3 algorithm
*
* @param type $value
* @return type
*/
function encodeValue($value) {
$encoded = "";
$value = round($value * 100000);
$r = ($value < 0) ? ~($value << 1) : ($value << 1);
while ($r >= 0x20) {
$val = (0x20|($r & 0x1f)) + 63;
$encoded .= chr($val);
$r >>= 5;
}
$lastVal = $r + 63;
$encoded .= chr($lastVal);
return $encoded;
}
/**
* Decode an encoded polyline string to an array of points
*
* @param type $value
* @return type
*/
static public function decodeValue($value) {
$index = 0;
$points = array();
$lat = 0;
$lng = 0;
while ($index < strlen($value)) {
$b;
$shift = 0;
$result = 0;
do {
$b = ord(substr($value, $index++, 1)) - 63;
$result |= ($b & 0x1f) << $shift;
$shift += 5;
} while ($b > 31);
$dlat = (($result & 1) ? ~($result >> 1) : ($result >> 1));
$lat += $dlat;
$shift = 0;
$result = 0;
do {
$b = ord(substr($value, $index++, 1)) - 63;
$result |= ($b & 0x1f) << $shift;
$shift += 5;
} while ($b > 31);
$dlng = (($result & 1) ? ~($result >> 1) : ($result >> 1));
$lng += $dlng;
$points[] = array('lat' => $lat/100000, 'lng' => $lng/100000);
}
return $points;
}
}
