PHP下使用强大的imagick轻巧生成组合缩略图

<code class="language-meta">project: blogtarget: use-imagick-to-composite-images-thumbnail.mddate: 2016-02-19status: publishtags:    - php    - imagick    - thumbnailcategories:    - php</code>

<code class="language-sh">sudo pecl install imagick</code>

<code class="language-php">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,                        ]                    ],                ];        }    }}</code>

<code class="language-php">$thumbnail = \clarence\thumbnail\Thumbnail::createFromImages($srcImages, 240, 320);$thumbnail->writeImage($outputDir."/example.jpg");</code>