php生成缩略图,加水印种
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2022-04-28 21:57:23
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php生成缩略图,加水印类
这个一个简单的GD库操作
$dinfo['height'] || $winfo['width'] > $dinfo['width']) { return false; } // 两张图,读到画布上! 但是图片可能是png,可能是jpeg,用什么函数读? $dfunc = 'imagecreatefrom' . $dinfo['ext']; $wfunc = 'imagecreatefrom' . $winfo['ext']; if (!function_exists($dfunc) || !function_exists($wfunc)) { return false; } // 动态加载函数来创建画布 $dim = $dfunc($dst); // 创建待操作的画布 $wim = $wfunc($water); // 创建水印画布 // 根据水印的位置 计算粘贴的坐标 switch($pos) { case 0 : // 左上角 $posx = 0; $posy = 0; break; case 1 : // 右上角 $posx = $dinfo['width'] - $winfo['width']; $posy = 0; break; case 3 : // 左下角 $posx = 0; $posy = $dinfo['height'] - $winfo['height']; break; default : $posx = $dinfo['width'] - $winfo['width']; $posy = $dinfo['height'] - $winfo['height']; } // 加水印 imagecopymerge($dim, $wim, $posx, $posy, 0, 0, $winfo['width'], $winfo['height'], $alpha); // 保存 if (!$save) { $save = $dst; unlink($dst); // 删除原图 } $createfunc = 'image' . $dinfo['ext']; $createfunc($dim, $save); imagedestroy($dim); imagedestroy($wim); return true; } /** thumb 生成缩略图 等比例缩放,两边留白 **/ public static function thumb($dst, $save = NULL, $width = 200, $height = 200) { // 首先判断待处理的图片存不存在 $dinfo = self::imageInfo($dst); if ($dinfo == false) { return false; } // 计算缩放比例 $calc = min($width / $dinfo['width'], $height / $dinfo['height']); // 创建原始图的画布 $dfunc = 'imagecreatefrom' . $dinfo['ext']; $dim = $dfunc($dst); // 创建缩略画布 $tim = imagecreatetruecolor($width, $height); // 创建白色填充缩略画布 $white = imagecolorallocate($tim, 255, 255, 255); // 填充缩略画布 imagefill($tim, 0, 0, $white); // 复制并缩略 $dwidth = (int)$dinfo['width'] * $calc; $dheight = (int)$dinfo['height'] * $calc; $paddingx = (int)($width - $dwidth) / 2; $paddingy = (int)($height - $dheight) / 2; imagecopyresampled($tim, $dim, $paddingx, $paddingy, 0, 0, $dwidth, $dheight, $dinfo['width'], $dinfo['height']); // 保存图片 if (!$save) { $save = $dst; unlink($dst); } $createfunc = 'image' . $dinfo['ext']; $createfunc($tim, $save); imagedestroy($dim); imagedestroy($tim); return true; }}// print_r(ImageTool::imageInfo('./home.jpg'));/* echo ImageTool::water('./home.jpg','./smallfeng.png','home1.jpg',0)?'OK':'FAIL'; echo ImageTool::water('./home.jpg','./smallfeng.png','home2.jpg',1)?'OK':'FAIL'; echo ImageTool::water('./home.jpg','./smallfeng.png','home3.jpg',2)?'OK':'FAIL'; echo ImageTool::water('./home.jpg','./smallfeng.png','home4.jpg',3)?'OK':'FAIL'; */
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