我收到了“解析错误:语法错误,第2行意外'{'”。我没有看到问题。
<?php
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'], $vertex2['x'])) { // Check if point is on an horizontal polygon boundary
return "boundary";
}
if ($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 == $point['x']) { // Check if point is on the polygon boundary (other than horizontal)
return "boundary";
}
if ($vertex1['x'] == $vertex2['x'] || $point['x'] <= $xinters) {
$intersections++;
}
}
}
// If the number of edges we passed through is even, then it's in the polygon.
if ($intersections % 2 != 0) {
return "inside";
} else {
return "outside";
}
}
function pointOnVertex($point, $vertices) {
foreach($vertices as $vertex) {
if ($point == $vertex) {
return true;
}
}
}
function pointStringToCoordinates($pointString) {
$coordinates = explode(" ", $pointString);
return array("x" => $coordinates[0], "y" => $coordinates[1]);
}
}
$pointLocation = new pointLocation();
$points = array("30 19", "0 0", "10 0", "30 20", "11 0", "0 11", "0 10", "30 22", "20 20");
$polygon = array("10 0", "20 0", "30 10", "30 20", "20 30", "10 30", "0 20", "0 10", "10 0");
foreach($points as $key => $point) {
echo "$key ($point) is " . $pointLocation->pointInPolygon($point, $polygon) . "<br>";
}
?>
有没有人看到这个问题?
谢谢,
-Laxmidi
答案 0 :(得分:3)
测试过它。运行没有错误并产生以下输出:
0 (30 19) is boundary<br>1 (0 0) is outside<br>2 (10 0) is vertex<br>3 (30 20) is vertex<br>4 (11 0) is boundary<br>5 (0 11) is boundary<br>6 (0 10) is vertex<br>7 (30 22) is outside<br>8 (20 20) is inside<br>
(Mac OS x 10.6.3,PHP 5.3.1 cli)
编辑:可能是因为您的错误导致您的脚本的其他部分通过include / require调用您的类定义。
更多信息可能有所帮助。
答案 1 :(得分:0)
我的工作正常,所以这听起来像编码或EOL问题。试试这些:
?>
。它没有任何意义。当然,这不会真正有助于解决您的问题,但它会使您的代码更清洁。<?php
后和class pointLocation {
之后添加换行符。某些版本的PHP在怪异的空白处绊倒。确保您的文件符合这些条件的好编辑器是Notepad++。有很多选择,它们使它变得容易。不要使用普通的旧记事本,因为Microsoft将您锁定为CRLF格式(不是PHP友好的),并且不能让您控制编码。
祝你好运!答案 2 :(得分:0)
像Techpriester一样进行测试,运行时没有错误,并产生以下输出:
0 (30 19) is boundary<br>1 (0 0) is outside<br>2 (10 0) is vertex<br>3 (30 20) is vertex<br>4 (11 0) is boundary<br>5 (0 11) is boundary<br>6 (0 10) is vertex<br>7 (30 22) is outside<br>8 (20 20) is inside<br>
在Ubuntu 9.10,Linux 2.6.31-17,PHP 5.3.2-0.dotdeb.2(cli)上测试
尝试检查你的php.ini是否有可能有错误的auto-prepended files(auto_prepend_file)。
答案 3 :(得分:0)
由于代码适用于其他所有人,我尝试将Stackoverflow中的代码复制并粘贴回我的系统并且它可以工作。奇怪的。我一定搞砸了格式化的东西。
我仍然不知道问题是什么,但至少它有效。
谢谢你mattbasta,Techpriester和Zack。