77 lines
2.5 KiB
PHP
77 lines
2.5 KiB
PHP
<?php
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function pnpoly($px, $py, $x, $y) {
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$npol = count($px);
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$c = false;
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for ($i = 0, $j = $npol - 1; $i < $npol; $j = $i++) {
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if (((($py[$i] <= $y) && ($y < $py[$j])) ||
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(($py[$j] <= $y) && ($y < $py[$i]))) &&
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($x < ($px[$j] - $px[$i]) * ($y - $py[$i]) / ($py[$j] - $py[$i]) + $px[$i]))
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$c = !$c;
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}
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return $c;
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}
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// Check for coordinates being in zipcode
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function isInZipcodeArea($pointLong, $pointLat, $zipcode) {
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global $db;
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// $plzp_polygons = $db->getOne("SELECT plzp_polygons FROM phoenix_special.plz_polygon WHERE plzp_code = '$zipcode'");
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$plzp_polygons = getOneStmt("SELECT plzp_polygons FROM phoenix_special.plz_polygon WHERE plzp_code = '$zipcode'", "plzp_polygons");
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$polygons = explode("|", $plzp_polygons);
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foreach($polygons as $polygon) {
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$polygonPointsX = array();
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$polygonPointsY = array();
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$points = explode(",", $polygon);
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foreach($points as $point) {
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list($plzp_x_deg, $plzp_y_deg) = explode(" ", $point);
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array_push ($polygonPointsX, $plzp_x_deg);
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array_push ($polygonPointsY, $plzp_y_deg);
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}
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if (pnpoly($polygonPointsX, $polygonPointsY, $pointLong, $pointLat))
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return true;
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}
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return false;
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}
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function findZipcodeArea($pointLong, $pointLat) {
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global $db;
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// Init
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$maxSearchRadius = 5;
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$maxSearches = 10;
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$geoEarthRadius = 6371.0;
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$tblZipcode = "phoenix_special.plz_geodb";
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$fldLat = "plzg_breite";
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$fldLong = "plzg_laenge";
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$fldZipcode = "plzg_code";
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$max_search_radius = 0;
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$plz_sql = "";
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do {
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$max_search_radius += $maxSearchRadius;
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$plz_sql_clause = "";
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if ($plz_sql != "")
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$plz_sql_clause = " AND " . $fldZipcode . " NOT IN ($plz_sql)";
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$sqlQuery = "SELECT " . $fldZipcode . " AS plz FROM " . $tblZipcode . " WHERE " .
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"(ACOS((SIN(" . deg2rad($pointLat) . ")*SIN(RADIANS(" . $fldLat . "))) + " . "(COS(" . deg2rad($pointLat) . ")*COS(RADIANS(" . $fldLat . "))*COS(RADIANS(" . $fldLong . ")-" .
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deg2rad($pointLong) . "))) * " . $geoEarthRadius . ") < " . $max_search_radius . $plz_sql_clause;
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$res = $db->query($sqlQuery);
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if (DB::isError($res)) die ("$PHP_SELF: " . $result->getMessage());
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$i = 0;
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while ($row = $res->fetch_assoc()):
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if (isInZipcodeArea($pointLong, $pointLat, $row["plz"])) {
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return $row["plz"];
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}
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if ($plz_sql != "")
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$plz_sql .= ",";
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$plz_sql .= "'" . $row["plz"] . "'";
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endwhile;
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$res->free();
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} while($max_search_radius < $maxSearchRadius * $maxSearches);
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return "";
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}
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?>
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