PHP 映像置中裁剪函數

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/** * 置中裁剪圖片 * @param string $source [原圖路徑] * @param int $width [設定寬度] * @param int $height [設定高度] * @param string $target [目標路徑] * @return bool [裁剪結果] */function image_center_crop($source, $width, $height, $target){    if (!file_exists($source)) return false;    /* 根據類型載入映像 */    switch (exif_imagetype($source)) {        case IMAGETYPE_JPEG:            $image = imagecreatefromjpeg($source);            break;        case IMAGETYPE_PNG:            $image = imagecreatefrompng($source);            break;        case IMAGETYPE_GIF:            $image = imagecreatefromgif($source);            break;    }    if (!isset($image)) return false;    /* 擷取映像尺寸資訊 */    $target_w = $width;    $target_h = $height;    $source_w = imagesx($image);    $source_h = imagesy($image);    /* 計算裁剪寬度和高度 */    $judge = (($source_w / $source_h) > ($target_w / $target_h));    $resize_w = $judge ? ($source_w * $target_h) / $source_h : $target_w;    $resize_h = !$judge ? ($source_h * $target_w) / $source_w : $target_h;    $start_x = $judge ? ($resize_w - $target_w) / 2 : 0;    $start_y = !$judge ? ($resize_h - $target_h) / 2 : 0;    /* 繪製置中縮放映像 */    $resize_img = imagecreatetruecolor($resize_w, $resize_h);    imagecopyresampled($resize_img, $image, 0, 0, 0, 0, $resize_w, $resize_h, $source_w, $source_h);    $target_img = imagecreatetruecolor($target_w, $target_h);    imagecopy($target_img, $resize_img, 0, 0, $start_x, $start_y, $resize_w, $resize_h);    /* 將圖片儲存至檔案 */    if (!file_exists(dirname($target))) mkdir(dirname($target), 0777, true);    switch (exif_imagetype($source)) {        case IMAGETYPE_JPEG:            imagejpeg($target_img, $target);            break;        case IMAGETYPE_PNG:            imagepng($target_img, $target);            break;        case IMAGETYPE_GIF:            imagegif($target_img, $target);            break;    }    return boolval(file_exists($target));}

 

PHP 映像置中裁剪函數