crm/protected/include/Lewaimai/LewaimaiMath.php

<?php

class LewaimaiMath {
	/*
	 * nvert 多边形的顶点数
	* vertx, verty 顶点X坐标和Y坐标分别组成的数组
	* testx testy 需要测试的点的X坐标和Y坐标
	*
	*/
	public static function InPolygon($nvert, $vertx, $verty, $testx, $testy)
	{
		$c = false;
	
		$i = 0;
		$j = 0;
		for ($i = 0, $j = $nvert - 1; $i < $nvert; $j = $i++)
		{
		if ( (($verty[$i] > $testy) != ($verty[$j] > $testy)) && ($testx < ($vertx[$j] - $vertx[$i]) * ($testy - $verty[$i]) / ($verty[$j] - $verty[$i]) + $vertx[$i]) )
			$c = !$c;
		}
	
		return $c;
	}
}