You need to have a lng value in the URL: http://vislab-ccom.unh.edu/~briana/rnc/getChartsWPoint.php?lat=43.1569&lng=-70.7008
"; return; } $url = "http://cordc.ucsd.edu/js/RNC/rnc.php"; // create a new cURL resource $ch = curl_init(); // set options curl_setopt($ch,CURLOPT_URL,$url); curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,2); curl_setopt($ch,CURLOPT_RETURNTRANSFER,1); $buffer = curl_exec($ch); // close cURL resource, and free up system resources curl_close($ch); if (empty($buffer)){ print "Sorry, the rnc product catalog is unavailable at the moment
";
}
else{
// put the chart catalog data into a variable for accessing
$rncCat = json_decode($buffer,true);
$panels = array();
$charts = array();
// set up panels array
foreach($rncCat as $item){
foreach($item["panels"] as $panel){
// add the item to the panel array
$panels[] = new panel($item["chart_id"],$panel["panel_no"],$panel["encoded_polygon"]);
}
}
// check the point against all the panels
foreach($panels as $panel){
if($panel->contains($point)){
$charts[] = $panel->getChartNo();
}
}
$json = json_encode($charts);
if($json){
Header('Content-type: application/json');
print($json);
}else{
print("
There are no charts available for that point.");
}
}
class panel{
private $panel_no;
private $chart_no;
private $polygon = array();
function __construct($chart_no,$panel_no,$encoded_poly){
$this->chart_no = $chart_no;
$this->panel_no = $panel_no;
$this->polygon = new Poly($encoded_poly);
//$this->showPanel();
}
function showPanel(){
echo "
chart = $this->chart_no: panel = $this->panel_no
";
$this->polygon->toString();
echo "
";
}
function contains($point){
// check if the point is exactly on a vertex
if($this->polygon->pointOnVertex($point))
return true;
// check if the point is inside the polygon or on the boundary
if($this->polygon->pointInsidePoly($point))
return true;
return false;
}
function getChartNo(){
return $this->chart_no;
}
}
class Poly{
private $points = array();
private $vert_count;
function __construct($encoded_poly){
$this->points = decodePolylineToArray($encoded_poly);
$this->vert_count = sizeof($this->points);
}
function toString(){
var_dump($this->points);
}
function pointOnVertex($point){
foreach($this->points as $vertex){
if($point[0] == $vertex[0] && $point[1] == $vertex[1]){
return true;
}
else
return false;
}
}
function pointInsidePoly($point){
//point is given in index 0=lat, index 1 = lng
$intersections = 0;
for($i=1; $i<$this->vert_count; $i++){
$v1 = $this->points[$i-1];
$v2 = $this->points[$i];
// check if the point is on a horizontal polygon boundary
if($v1[0] == $v2[0] and $v1[0] == $point[0] and $point[1] > min($v1[1],$v2[1]) and $point[1] < max($v1[1], $v2[1])){
return true; // on the boundary
}
if($point[0] > min($v1[0], $v2[0]) and $point[0] <= max($v1[0], $v2[0]) and $point[1] <= max($v1[1], $v2[1]) and $v1[0] != $v2[0]){
$xinters = ($point[0] - $v1[0]) * ($v2[1] - $v1[1]) / ($v2[0] - $v1[0]) + $v1[1];
if ($xinters == $point[1]) { // Check if point is on the polygon boundary (other than horizontal)
return true; // on the boundary
}
if ($v1[1] == $v2[1] || $point[1] <= $xinters) {
$intersections++;
}
}
}
// If the number of edges we passed through is even, then it's in the polygon.
if ($intersections % 2 != 0) {
return true; //inside the polygon
} else {
return false; //outside the polygon
}
}
}
?>