先给大家炫下效果图,如果大家觉得还很满意,请继续往下阅读:
这里说的imagick 是 ImageMagick 在PHP下的扩展。使用pecl安装起来那叫一个轻松简单一条命令就搞定:
复制代码 代码如下:
sudo pecl install imagick
(扩展装好后还是要在php.ini中加上extension=imagick.so,然后记得重启apache或php-fpm服务。)
最近有个需求是要把多张图片组合起来生成缩略图,刚好用用这个强大的imagick扩展。
这个需求是要这样生成缩略图:
1.如果有1张图片,就直接生成这张图片的缩略图;
2.如果有2张图片,则一张在左边一张在右边,各一半;
3.如果有3张图片,则两张左边平均分配,一张独占右边;
4.如果有4张图片,则像田字格一样平均分配空间;
5.更多张图片,则只取前4张,按田字格方式生成缩略图。
这规则还真不少,不过还不算太过复杂,很快搞出来了:
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namespace \clarence\thumbnail;
class Thumbnail extends \Imagick
{
/**
* @param array $images
* @param int $width
* @param int $height
* @return static
* @throws ThumbnailException
*/
public static function createFromImages( $images , $width , $height ){
if ( empty ( $images )){
throw new ThumbnailException( "No images!" );
}
$thumbnail = new static ();
$thumbnail ->newImage( $width , $height , 'white' , 'jpg' );
$thumbnail ->compositeImages( $images );
return $thumbnail ;
}
public function compositeImages( $images ){
$imagesKeys = array_keys ( $images );
$compositeConfig = $this ->calcCompositeImagesPosAndSize( $images );
foreach ( $compositeConfig as $index => $cfg ){
$imgKey = $imagesKeys [ $index ];
$img = new \Imagick( $images [ $imgKey ]);
$img = $this ->makeCompositeThumbnail( $img , $cfg );
$this ->compositeImage( $img , self::COMPOSITE_OVER, $cfg [ 'to' ][ 'x' ], $cfg [ 'to' ][ 'y' ]);
}
}
protected function makeCompositeThumbnail(\Imagick $img , $cfg ){
$img ->cropThumbnailImage( $cfg [ 'size' ][ 'width' ], $cfg [ 'size' ][ 'height' ]);
return $img ;
}
protected function calcCompositeImagesPosAndSize( $images ){
$width = $this ->getImageWidth();
$height = $this ->getImageHeight();
switch ( count ( $images )){
case 0:
throw new ThumbnailException( "No images!" );
case 1:
// | 0 |
return [
0 => [
'to' => [ 'x' => 0, 'y' => 0 ],
'size' => [
'width' => $width ,
'height' => $height ,
]
]
];
case 2:
// | 0 | 1 |
return [
0 => [
'to' => [ 'x' => 0, 'y' => 0 ],
'size' => [
'width' => $width / 2,
'height' => $height ,
]
],
1 => [
'to' => [ 'x' => $width / 2, 'y' => 0],
'size' => [
'width' => $width / 2,
'height' => $height ,
]
]
];
case 3:
// | 0 | 1 |
// | 2 | |
return [
0 => [
'to' => [ 'x' => 0, 'y' => 0 ],
'size' => [
'width' => $width / 2,
'height' => $height / 2,
]
],
1 => [
'to' => [ 'x' => $width / 2, 'y' => 0],
'size' => [
'width' => $width / 2,
'height' => $height ,
]
],
2 => [
'to' => [ 'x' => 0, 'y' => $height / 2 ],
'size' => [
'width' => $width / 2,
'height' => $height / 2,
]
],
];
default :
// >= 4:
// | 0 | 1 |
// | 2 | 3 |
return [
0 => [
'to' => [ 'x' => 0, 'y' => 0 ],
'size' => [
'width' => $width / 2,
'height' => $height / 2,
]
],
1 => [
'to' => [ 'x' => $width / 2, 'y' => 0],
'size' => [
'width' => $width / 2,
'height' => $height / 2,
]
],
2 => [
'to' => [ 'x' => 0, 'y' => $height / 2 ],
'size' => [
'width' => $width / 2,
'height' => $height / 2,
]
],
3 => [
'to' => [ 'x' => $width / 2, 'y' => $height / 2],
'size' => [
'width' => $width / 2,
'height' => $height / 2,
]
],
];
}
}
}
|
用个试试:
复制代码 代码如下:
$thumbnail = \clarence\thumbnail\Thumbnail::createFromImages($srcImages, 240, 320);
$thumbnail->writeImage($outputDir."/example.jpg");
以上内容给大家介绍了PHP利用imagick生成组合缩略图的相关知识,希望对大家有所帮助!