图片裁剪缩放函数(支持方位裁剪和自定义坐标裁剪)
图片裁剪缩放函数,支持方位裁剪和自定义坐标裁剪/**<br>
* 图片裁剪函数,支持指定定点裁剪和方位裁剪两种裁剪模式<br>
* @param <string> $src_file 原图片路径<br>
* @param <int> $new_width 裁剪后图片宽度(当宽度超过原图片宽度时,去原图片宽度)<br>
* @param <int> $new_height 裁剪后图片高度(当宽度超过原图片宽度时,去原图片高度)<br>
* @param <int> $type 裁剪方式,1-方位模式裁剪;0-定点模式裁剪。<br>
* @param <int> $pos 方位模式裁剪时的起始方位(当选定点模式裁剪时,此参数不起作用)<br>
* 1为顶端居左,2为顶端居中,3为顶端居右; <br>
* 4为中部居左,5为中部居中,6为中部居右; <br>
* 7为底端居左,8为底端居中,9为底端居右;<br>
* @param <int> $start_x 起始位置X (当选定方位模式裁剪时,此参数不起作用)<br>
* @param <int> $start_y 起始位置Y(当选定方位模式裁剪时,此参数不起作用)<br>
* @return <string> 裁剪图片存储路径<br>
*/<br>
function thumb($src_file, $new_width, $new_height, $type = 1, $pos = 5, $start_x = 0, $start_y = 0) {<br>
$pathinfo = pathinfo($src_file);<br>
$dst_file = $pathinfo['dirname'] . '/' . $pathinfo['filename'] .'_'. $new_width . 'x' . $new_height . '.' . $pathinfo['extension'];<br>
if (!file_exists($dst_file)) {<br>
if ($new_width
echo "params width or height error !";<br>
exit();<br>
}<br>
if (!file_exists($src_file)) {<br>
echo $src_file . " is not exists !";<br>
exit();<br>
}<br>
// 图像类型<br>
$img_type = exif_imagetype($src_file);<br>
$support_type = array(IMAGETYPE_JPEG, IMAGETYPE_PNG, IMAGETYPE_GIF);<br>
if (!in_array($img_type, $support_type, true)) {<br>
echo "只支持jpg、png、gif格式图片裁剪";<br>
exit();<br>
}<br>
/* 载入图像 */<br>
switch ($img_type) {<br>
case IMAGETYPE_JPEG :<br>
$src_img = imagecreatefromjpeg($src_file);<br>
break;<br>
case IMAGETYPE_PNG :<br>
$src_img = imagecreatefrompng($src_file);<br>
break;<br>
case IMAGETYPE_GIF :<br>
$src_img = imagecreatefromgif($src_file);<br>
break;<br>
default:<br>
echo "载入图像错误!";<br>
exit();<br>
}<br>
/* 获取源图片的宽度和高度 */<br>
$src_width = imagesx($src_img);<br>
$src_height = imagesy($src_img);<br>
/* 计算剪切图片的宽度和高度 */<br>
$mid_width = ($src_width
$mid_height = ($src_height
/* 初始化源图片剪切裁剪的起始位置坐标 */<br>
switch ($pos * $type) {<br>
case 1://1为顶端居左 <br>
$start_x = 0;<br>
$start_y = 0;<br>
break;<br>
case 2://2为顶端居中 <br>
$start_x = ($src_width - $mid_width) / 2;<br>
$start_y = 0;<br>
break;<br>
case 3://3为顶端居右 <br>
$start_x = $src_width - $mid_width;<br>
$start_y = 0;<br>
break;<br>
case 4://4为中部居左 <br>
$start_x = 0;<br>
$start_y = ($src_height - $mid_height) / 2;<br>
break;<br>
case 5://5为中部居中 <br>
$start_x = ($src_width - $mid_width) / 2;<br>
$start_y = ($src_height - $mid_height) / 2;<br>
break;<br>
case 6://6为中部居右 <br>
$start_x = $src_width - $mid_width;<br>
$start_y = ($src_height - $mid_height) / 2;<br>
break;<br>
case 7://7为底端居左 <br>
$start_x = 0;<br>
$start_y = $src_height - $mid_height;<br>
break;<br>
case 8://8为底端居中 <br>
$start_x = ($src_width - $mid_width) / 2;<br>
$start_y = $src_height - $mid_height;<br>
break;<br>
case 9://9为底端居右 <br>
$start_x = $src_width - $mid_width;<br>
$start_y = $src_height - $mid_height;<br>
break;<br>
default://随机 <br>
break;<br>
}<br>
// 为剪切图像创建背景画板<br>
$mid_img = imagecreatetruecolor($mid_width, $mid_height);<br>
//拷贝剪切的图像数据到画板,生成剪切图像<br>
imagecopy($mid_img, $src_img, 0, 0, $start_x, $start_y, $mid_width, $mid_height);<br>
// 为裁剪图像创建背景画板<br>
$new_img = imagecreatetruecolor($new_width, $new_height);<br>
//拷贝剪切图像到背景画板,并按比例裁剪<br>
imagecopyresampled($new_img, $mid_img, 0, 0, 0, 0, $new_width, $new_height, $mid_width, $mid_height);<br>
<br>
/* 按格式保存为图片 */<br>
switch ($img_type) {<br>
case IMAGETYPE_JPEG :<br>
imagejpeg($new_img, $dst_file, 100);<br>
break;<br>
case IMAGETYPE_PNG :<br>
imagepng($new_img, $dst_file, 9);<br>
break;<br>
case IMAGETYPE_GIF :<br>
imagegif($new_img, $dst_file, 100);<br>
break;<br>
default:<br>
break;<br>
}<br>
}<br>
return ltrim($dst_file, '.');<br>
}</string></int></int></int></int></int></int></string>
PS:附件是一个有样例图片的测试demo。
不过,这个函数不支持动态gif图片的裁剪缩放。
图片裁剪缩放demo.zip
( 92.54 KB 下载:1059 次 )
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