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Dir : ~/home/id/taxi.dev-unit.com/app/Helpers/

View File Name : pointLocation.php

<?php

$combinePoints = array();
function zoneCoordinates($longitudeZoneArray, $latitudeZoneArray)
{

    $combinePoints = $longitudeZoneArray . " " . $latitudeZoneArray;

    return $combinePoints;
}


class pointLocation
{
    var $pointOnVertex = true; // Check if the point sits exactly on one of the vertices?

    function pointLocation()
    {
    }

    function pointInPolygon($point, $polygon, $pointOnVertex = true)
    {

        $this->pointOnVertex = $pointOnVertex;

        // Transform string coordinates into arrays with x and y values
        $point = $this->pointStringToCoordinates($point);
        $vertices = array();



        foreach ($polygon as $vertex) {

            $vertices[] = $this->pointStringToCoordinates($vertex);
        }


        // Check if the point sits exactly on a vertex
        if ($this->pointOnVertex == true and $this->pointOnVertex($point, $vertices) == true) {
            return "vertex";
        }

        // Check if the point is inside the polygon or on the boundary
        $intersections = 0;
        $vertices_count = count($vertices);



        for ($i = 1; $i < $vertices_count; $i++) {

            $vertex1 = $vertices[$i - 1];
            $vertex2 = $vertices[$i];
            if ($vertex1['y'] == $vertex2['y'] and $vertex1['y'] == $point['y'] and $point['x'] > min($vertex1['x'], $vertex2['x']) and $point['x'] < max($vertex1['x'], $vertex2['x'])) { // Check if point is on an horizontal polygon boundary
                //return "boundary";
                return true;
            }
            if ($point['y'] > min($vertex1['y'], $vertex2['y']) and $point['y'] <= max($vertex1['y'], $vertex2['y']) and $point['x'] <= max($vertex1['x'], $vertex2['x']) and $vertex1['y'] != $vertex2['y']) {
                $xinters = ($point['y'] - $vertex1['y']) * ($vertex2['x'] - $vertex1['x']) / ($vertex2['y'] - $vertex1['y']) + $vertex1['x'];
                if ($xinters == $point['x']) { // Check if point is on the polygon boundary (other than horizontal)
                    //return "boundary";
                    return true;
                }
                if ($vertex1['x'] == $vertex2['x'] || $point['x'] <= $xinters) {
                    $intersections++;
                }
            }
        }


        // If the number of edges we passed through is odd, then it's in the polygon.
        if ($intersections % 2 != 0) {

            //die("inside");
            //return "inside";

            return true;
        } else {
          // return "outside";

            //die("outside");
            return false;
        }
    }

    function pointStringToCoordinates($pointString)
    {

        $coordinates = explode(" ", $pointString);

        return array("x" => $coordinates[0], "y" => $coordinates[1]);
    }

    function pointOnVertex($point, $vertices)
    {
        foreach ($vertices as $vertex) {
            if ($point == $vertex) {
                return true;
            }
        }

    }

}

?>