PHP结合JQueryJcrop实现图片裁切实例详解，
我们经常可以看到一些网站上有图片剪切的功能，或许你会觉得这一功能炫目华丽，神秘莫测！但是今天介绍的一款专用于图片裁切的插件jquery.Jcrop.min.js就将揭开图片剪切的神秘面纱。使用这个插件可以很方便的实现这一功能，使用时仅需鼠标在图片上圈选出选区，即可把图片裁切成所选部分，非常适合用于头像的裁切编辑功能。
本实例演示分为HTML和php两部分：
第一部分，HTML代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Jcrop实现图片裁剪</title>
<script src="./jquery-1.6.2.min.js"></script>
<script src="./jquery.Jcrop.min.js"></script>
<link rel="stylesheet" href="./jquery.Jcrop.min.css" rel="external nofollow" type="text/css" />
<style type="text/css">
#preview{width:100px;height:100px;border:1px solid #000;overflow:hidden;}
#imghead{filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=image);}
</style>
<script language="Javascript">
jQuery(function(){
jQuery('#imghead').Jcrop({
aspectRatio: 1,
onSelect: updateCoords, //选中区域时执行对应的回调函数
onChange: updateCoords, //选择区域变化时执行对应的回调函数
});
});
function updateCoords(c)
{
jQuery('#x').val(c.x); //选中区域左上角横
jQuery('#y').val(c.y); //选中区域左上角纵坐标
//jQuery("#x2").val(c.x2); //选中区域右下角横坐标
//jQuery("#y2").val(c.y2); //选中区域右下角纵坐标
jQuery('#w').val(c.w); //选中区域的宽度
jQuery('#h').val(c.h); //选中区域的高度
};
function checkCoords()
{
if (parseInt(jQuery('#w').val())>0) return true;
alert('请选择需要裁切的图片区域.');
return false;
};
</script>
</head>
<body>
<img id="imghead" border=0 src='./image/b4.jpg' / alt="PHP结合JQueryJcrop实现图片裁切实例详解，" >
<form action="crop.php" method="post" onsubmit="return checkCoords();">
<input type="text" id="x" name="x" />
<input type="text" id="y" name="y" />
<input type="text" id="w" name="w" />
<input type="text" id="h" name="h" />
<input type="submit" value="提交">
</form>
</body>
</html>
第二部分：PHP处理部分crop.php：
<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST')
{
$targ_w = $targ_h = 150;
$jpeg_quality = 90;
$src = './image/b4.jpg';
$img_r = imagecreatefromjpeg($src);
$dst_r = ImageCreateTrueColor( $targ_w, $targ_h );
imagecopyresampled($dst_r,$img_r,0,0,$_POST['x'],$_POST['y'],
$targ_w,$targ_h,$_POST['w'],$_POST['h']);
header('Content-type: image/jpeg');
imagejpeg($dst_r,null,$jpeg_quality);
exit;
}
?>
补充：jquery.Jcrop.min.js本站下载地址：http://www.bkjia.com/jiaoben/24768.html
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