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Merge pull request #7 from bristweb/master

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Divide and conquer
This commit is contained in:
Josh Sherman 2014-03-12 11:36:12 -04:00
commit 34506d71db
1 changed files with 59 additions and 1 deletions
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60
GooglePlaces.php
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@ -20,6 +20,10 @@ class GooglePlaces
public $reference = null; public $reference = null;
public $opennow = null; public $opennow = null;
public $subradius = null;
public $getmax = true;
private $grid = null;
public function __construct($key) public function __construct($key)
{ {
$this->key = $key; $this->key = $key;
@ -41,6 +45,9 @@ class GooglePlaces
$parameters = $this->parameterBuilder($parameters); $parameters = $this->parameterBuilder($parameters);
$parameters = $this->methodChecker($parameters, $method); $parameters = $this->methodChecker($parameters, $method);
if (!empty($this->subradius)) {
return $this->subdivide($url, $parameters);
}
return $this->queryGoogle($url, $parameters); return $this->queryGoogle($url, $parameters);
} }
@ -51,7 +58,7 @@ class GooglePlaces
foreach (get_object_vars($this) as $variable => $value) foreach (get_object_vars($this) as $variable => $value)
{ {
// Except these variables // Except these variables
if (!in_array($variable, array('base_url', 'method', 'output', 'pagetoken', 'response'))) if (!in_array($variable, array('base_url', 'method', 'output', 'pagetoken', 'response', 'subradius', 'getmax','grid')))
{ {
// Assuming it's not null // Assuming it's not null
if ($value !== null) if ($value !== null)
@ -252,6 +259,57 @@ class GooglePlaces
return $this->response; return $this->response;
} }
/**
* Returns the longitude equal to a given distance (meters) at a given latitude
*/
public function meters2lng($meters,$latitude){
return $meters/(cos(deg2rad($latitude))*40075160/360);
}
/**
* Returns the latitude equal to a given distance (meters)
*/
public function meters2lat($meters){
return $meters/(40075160/360);
}
/**
* Returns the aggregated responses for a subdivided search
*/
private function subdivide($url, $parameters){
if (($this->radius % $this->subradius) || ($this->subradius < 200) || (($this->radius/$this->subradius)%2)) {
throw new Exception('Subradius should divide evenly into radius. Also, subradius should be 200 meters or so. (ex: 2000/200 = 10x10 grid. NOT 2000/33 = 60.6x60.6 grid. NOT 2000/16 = 125x125 grid)');
}
$center = explode(',', $this->location);
$centerlat = $center[0];
$centerlng = $center[1];
$count = $this->radius / $this->subradius;
$lati = $this->meters2lat($this->subradius*2);
$this->grid['results'] = array();
for ($i=$count/2*-1; $i <= $count/2; $i++) {
$lat = $centerlat + $i*$lati;
$lngi = $this->meters2lng($this->subradius*2,$lat);
for ($j=$count/2*-1; $j <= $count/2; $j++) {
$lng = $centerlng + $j*$lngi;
$loc = $lat . ',' . $lng;
$parameters['location'] = $loc;
$parameters['radius'] = $this->subradius;
$this->queryGoogle($url, $parameters);
$this->grid[$i][$j] = $this->response;
$this->grid['results'] = array_merge($this->grid['results'],$this->response['results']);
while ($this->response['next_page_token']) {
$this->pagetoken = $this->response['next_page_token'];
$this->queryGoogle($url, $parameters);
$this->grid[$i][$j] = array_merge($this->grid[$i][$j],$this->response);
$this->grid['results'] = array_merge($this->grid['results'],$this->response['results']);
$this->pagetoken = null;
}
}
}
return $this->grid;
}
} }
?> ?>