php实现计算坐标点在某区域项⽬需求：通过地图坐标和区域坐标点集合判断当前坐标是否在坐标点集合区域中
$area[array] 区域坐标点集合数组
$area = array(
// 天通苑店
0 => array(
array('x'=>116.38295, 'y'=>40.09416),
array('x'=>116.44037, 'y'=>40.095898),
array('x'=>116.448275,'y'=>40.083313),
array('x'=>116.448455,'y'=>40.050818),
array('x'=>116.448275,'y'=>40.038307),
array('x'=>116.441448,'y'=>40.038418),
array('x'=>116.436058,'y'=>40.038804),
array('x'=>116.417302,'y'=>40.039136),
array('x'=>116.414822,'y'=>40.039384),
array('x'=>116.412738,'y'=>40.039329),
array('x'=>116.407672,'y'=>40.039329),
array('x'=>116.388628,'y'=>40.085162),
腊八粥的做法 array('x'=>116.383633,'y'=>40.084997)
),
//亚运村
1 => array(
array('x'=>116.358804,'y'=>40.028474),
array('x'=>116.41608, 'y'=>40.02875),
array('x'=>116.41723, 'y'=>40.038915),
array('x'=>116.447988,'y'=>40.037921),
array('x'=>116.447844,'y'=>40.026761),
array('x'=>116.455821,'y'=>40.024164),
焖酥鱼的家常做法
array('x'=>116.446281,'y'=>39.994736),
array('x'=>116.443532,'y'=>39.995372),
array('x'=>116.376267,'y'=>39.993493),
array('x'=>116.375908,'y'=>40.000015),
array('x'=>116.372027,'y'=>39.999904),
array('x'=>116.371452,'y'=>40.007366),
array('x'=>116.359451,'y'=>40.006758)
),
//望京店
2 => array(
array('x'=>116.46387, 'y'=>40.021125),
array('x'=>116.484495,'y'=>40.020462),
array('x'=>116.515684,'y'=>39.995151),
array('x'=>116.51519, 'y'=>39.976137),
array('x'=>116.491906,'y'=>39.972985),
array('x'=>116.476239,'y'=>39.977298),
array('x'=>116.467472,'y'=>39.96917),
array('x'=>116.443325,'y'=>39.984817),
array('x'=>116.449506,'y'=>39.993109),
array('x'=>116.446357,'y'=>39.994736),
array('x'=>116.456037,'y'=>40.024109)
),
);
<?php
/**
* 验证坐标点是否在某区域内
* @author xiaoliang <>
* Class validationMap
*/
class InareaAction extends CommonAction {
// ⼀个表⽰区域的三维数组
public $config = null;
// 包含每个区域的四边形
public $rectangles = null;
// 每个区域（多边形）的所有边
public $lines = null;
// 要判断的点的x, y坐标
public $_x = null;
public $_y = null;
白茶如何泡public function __construct($config){
$this->config = $config;
$this->initRectangles();
$this->initLines();
/*
获取包含每个配送区域的四边形
*/
public function initRectangles(){
foreach ($this->config as $k => $v) {
$this->rectangles[$k]['minX'] = $this->getMinXInEachConfig($k);
$this->rectangles[$k]['minY'] = $this->getMinYInEachConfig($k);
$this->rectangles[$k]['maxX'] = $this->getMaxXInEachConfig($k);
$this->rectangles[$k]['maxY'] = $this->getMaxYInEachConfig($k);
}
}
/*
星期四英语初始化每个区域（多边形）的边（线段：直线的⼀部分【限制x或者y坐标范围】）
n 个顶点构成的多边形，有 n-1 条边
麦粒肿可以化妆吗
*/
public function initLines(){
foreach ($this->config as $k => $v) {
$pointNum = count($v); // 区域的顶点个数
$lineNum = $pointNum - 1; // 区域的边条数
for($i=0; $i<$lineNum; $i++){
// y=kx+b : k
if($this->config[$k][$i]['x'] - $this->config[$k][$i+1]['x'] == 0) $this->lines[$k][$i]['k'] = 0;
el $this->lines[$k][$i]['k'] =
($this->config[$k][$i]['y'] - $this->config[$k][$i+1]['y'])/($this->config[$k][$i]['x'] - $this->config[$k][$i+1]['x']);
// y=kx+b : b
$this->lines[$k][$i]['b'] = $this->config[$k][$i+1]['y'] - $this->lines[$k][$i]['k'] * $this->config[$k][$i+1]['x'];
$this->lines[$k][$i]['lx'] = min($this->config[$k][$i]['x'], $this->config[$k][$i+1]['x']);
$this->lines[$k][$i]['rx'] = max($this->config[$k][$i]['x'], $this->config[$k][$i+1]['x']);
}
$pointNum-=1;
if($this->config[$k][$pointNum]['x'] - $this->config[$k][0]['x'] == 0) $this->lines[$k][$pointNum]['k'] = 0;
el $this->lines[$k][$pointNum]['k'] =
($this->config[$k][$pointNum]['y'] - $this->config[$k][0]['y'])/($this->config[$k][$pointNum]['x'] - $this->config[$k][0]['x']); // y=kx+b : b
$this->lines[$k][$pointNum]['b'] = $this->config[$k][0]['y'] - $this->lines[$k][$pointNum]['k'] * $this->config[$k][0]['x'];
$this->lines[$k][$pointNum]['lx'] = min($this->config[$k][$pointNum]['x'], $this->config[$k][0]['x']);
$this->lines[$k][$pointNum]['rx'] = max($this->config[$k][$pointNum]['x'], $this->config[$k][0]['x']);
}
}
/*
获取⼀组坐标中，x坐标最⼩值
*/
public function getMinXInEachConfig($index){
$minX = 200;
foreach ($this->config[$index] as $k => $v) {
if($v['x'] < $minX){
$minX = $v['x'];
}
}
return $minX;
}
哑巴父亲/*
获取⼀组坐标中，y坐标最⼩值
*/
public function getMinYInEachConfig($index){
$minY = 200;
foreach ($this->config[$index] as $k => $v) {
if($v['y'] < $minY){
$minY = $v['y'];
}
}
return $minY;
}
/*
获取⼀组坐标中，x坐标最⼤值
*/
public function getMaxXInEachConfig($index){
$maxX = 0;
foreach ($this->config[$index] as $k => $v) {
if($v['x'] > $maxX){
$maxX = $v['x'];
}
健忘的
}
return $maxX;
}
/*
获取⼀组坐标中，y坐标最⼤值
public function getMaxYInEachConfig($index){
$maxY = 0;
foreach ($this->config[$index] as $k => $v) {
if($v['y'] > $maxY){
$maxY = $v['y'];碧根果有什么功效
}
}
return $maxY;
}
/*
获取 y=y0 与特定区域的所有边的交点，并去除和顶点重复的，再将交点分为左和右两部分 */
public function getCrossPointInCertainConfig($index){
$crossPoint = null;
foreach ($this->lines[$index] as $k => $v) {
if($v['k'] == 0) return true;
$x0 = ($this->_y - $v['b']) / $v['k']; // 交点x坐标
if($x0 == $this->_x) return true; // 点在边上
if($x0 > $v['lx'] && $x0 < $v['rx']){
if($x0 < $this->_x) $crossPoint['left'][] = $x0;
if($x0 > $this->_x) $crossPoint['right'][] = $x0;
}
}
return $crossPoint;
}
/*
检测⼀个点，是否在区域内
返回结果：
return === fal : 点不在区域内
return 0, 1, 2, 3 ... 点所在的区域编号（配置⽂件中的区域编号。）
*/
public function checkPoint($x, $y){
$this->_x = $x;
$this->_y = $y;
$contain = null;
foreach ($this->rectangles as $k => $v) {
if($x > $v['maxX'] || $x < $v['minX'] || $y > $v['maxY'] || $y < $v['minY']){
continue;
}el{
$contain = $k;
break;
}
}
if($contain === null) return fal;
$crossPoint = $this->getCrossPointInCertainConfig($contain);
if($crossPoint === true) return $contain;
if(count($crossPoint['left'])%2 == 1 && count($crossPoint['right'])%2 == 1) return $contain; return fal;
}
}
//实例化对象
$area = new Area($area);
//判断坐标点是否在区域中如果坐标点在某⼀区域返回区域编号否则返回fal;
var_dump($area->checkPoint(116.531748,39.944229))
