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php - 需要帮助使用 javascript 根据 php 值计算经度和纬度中点

转载 作者:行者123 更新时间:2023-11-28 21:23:21 26 4
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我目前正在开发一个项目,但遇到了相当大的障碍。我正在使用 google map API 运行 map 应用程序,我需要计算两点之间的中点,总共 4 个点(纬度/经度),它们存储为来自用户的 php 值。

我当前使用的公式需要将以度为单位的值转换为弧度。然后我需要将它们转换回度数以插入我的代码的谷歌地图部分。

我需要计算这个点,以便我可以将其显示为 map 的中间,以便它能够整齐且居中地显示。

这是我当前的代码:

<?php
ob_start();
?>

<?php

$from = $_POST["from"];
$to = $_POST["to"];

$connection = mysql_connect("localhost", "dlazett", "PASSWORD");

mysql_select_db("dlazett", $connection);

$f = mysql_query ("SELECT * FROM capstone WHERE id = '$from' ",
$connection);

$wfrom = mysql_fetch_array($f);

$latf = $wfrom["lat"];
$lonf = $wfrom["lon"];

$t = mysql_query ("SELECT * FROM capstone WHERE id = '$to' ",
$connection);

$wto = mysql_fetch_array($t);

$latt = $wto["lat"];
$lont = $wto["lon"];

?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-…
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-microsoft-com:vml">
<head>
<title>UT Campus Compass</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta name = "viewport" content = "width = device-width">
<meta name="apple-mobile-web-app-capable" content="yes" />

<script src="http://maps.google.com/maps?file=ap…
type="text/javascript"></script>
<script type="text/javascript">
function midpoint() {
var lat2 = (<?php echo "$latf";?>) * (Math.PI/180);
var lat1 = (<?php echo "$latt";?>) * (Math.PI/180);
var dLon = (<?php echo "$lonf";?>-<?php echo "$lont";?>) * (Math.PI/180);
var Bx = Math.cos(lat2) * Math.cos(dLon);
var By = Math.cos(lat2) * Math.sin(dLon);
var lat3 = Math.atan2(Math.sin(lat1)+Math.sin(lat2)…
Math.sqrt( (Math.cos(lat1)+Bx)*(Math.cos(lat1)+Bx) + By*By) );
var lon3 = lon1 + Math.atan2(By, Math.cos(lat1) + Bx);
var lat4 = lat3 * (180/Math.PI);
var lon4 = lon3 * (180/Math.PI);
}

function initialize() {
if (GBrowserIsCompatible()) {
var map = new GMap2(document.getElementById("map_canva…
map.setCenter(new GLatLng(lat4, lon4), 16);
var polyline = new GPolyline([
new GLatLng(<?php echo "$latf";?>, <?php echo "$lonf";?>),
new GLatLng(<?php echo "$latt";?>, <?php echo "$lont";?>)
], "#ff0000", 10);
map.addOverlay(polyline);
}
}
</script>
</head>

<body onload="initialize()" onunload="GUnload()">
<center>
<div id="map_canvas" style="width: 425px; height: 600px"></div>
<div id="message"></div>
</body>
</html>

<?php
ob_end_flush();
?>

任何帮助将不胜感激。

谢谢,丹

最佳答案

在 PHP 中

function midpoint ($lat1, $lng1, $lat2, $lng2) {

$lat1= deg2rad($lat1);
$lng1= deg2rad($lng1);
$lat2= deg2rad($lat2);
$lng2= deg2rad($lng2);

$dlng = $lng2 - $lng1;
$Bx = cos($lat2) * cos($dlng);
$By = cos($lat2) * sin($dlng);
$lat3 = atan2( sin($lat1)+sin($lat2),
sqrt((cos($lat1)+$Bx)*(cos($lat1)+$Bx) + $By*$By ));
$lng3 = $lng1 + atan2($By, (cos($lat1) + $Bx));
$pi = pi();
return ($lat3*180)/$pi .' '. ($lng3*180)/$pi;
}

关于php - 需要帮助使用 javascript 根据 php 值计算经度和纬度中点,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/5657194/

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