php多功能图片处理类分享(php图片缩放类)

<?php    
/**   
*  基本图片处理，用于完成图片缩入，水印添加   
*  当水印图超过目标图片尺寸时，水印图能自动适应目标图片而缩小   
*  水印图可以设置跟背景的合并度  
*/    /*   
使用方法:   
    自动裁切:   
    程序会按照图片的尺寸从中部裁切最大的正方形，并按目标尺寸进行缩略   
    $t--->setSrcImg("img/test.jpg");   
    $t->setCutType(1);//这一句就OK了   
    $t->setDstImg("tmp/new_test.jpg");   
    $t->createImg(60,60);   
    手工裁切:   
    程序会按照指定的位置从源图上取图   
    $t->setSrcImg("img/test.jpg");   
    $t->setCutType(2);//指明为手工裁切   
    $t->setSrcCutPosition(100, 100);// 源图起点坐标   
    $t->setRectangleCut(300, 200);// 裁切尺寸   
    $t->setDstImg("tmp/new_test.jpg");   
    $t->createImg(300,200);   
*/    
class ThumbHandler    
{    
    var $dst_img;// 目标文件    
    var $h_src; // 图片资源句柄    
    var $h_dst;// 新图句柄    
    var $h_mask;// 水印句柄    
    var $img_create_quality = 100;// 图片生成质量    
    var $img_display_quality = 80;// 图片显示质量,默认为75    
    var $img_scale = 0;// 图片缩放比例    
    var $src_w = 0;// 原图宽度    
    var $src_h = 0;// 原图高度    
    var $dst_w = 0;// 新图总宽度    
    var $dst_h = 0;// 新图总高度    
    var $fill_w;// 填充图形宽    
    var $fill_h;// 填充图形高    
    var $copy_w;// 拷贝图形宽    
    var $copy_h;// 拷贝图形高    
    var $src_x = 0;// 原图绘制起始横坐标    
    var $src_y = 0;// 原图绘制起始纵坐标    
    var $start_x;// 新图绘制起始横坐标    
    var $start_y;// 新图绘制起始纵坐标    
    var $mask_word;// 水印文字    
    var $mask_img;// 水印图片    
    var $mask_pos_x = 0;// 水印横坐标    
    var $mask_pos_y = 0;// 水印纵坐标    
    var $mask_offset_x = 5;// 水印横向偏移    
    var $mask_offset_y = 5;// 水印纵向偏移    
    var $font_w;// 水印字体宽    
    var $font_h;// 水印字体高    
    var $mask_w;// 水印宽    
    var $mask_h;// 水印高    
    var $mask_font_color = "#ffffff";// 水印文字颜色    
    var $mask_font = 2;// 水印字体    
    var $font_size;// 尺寸    
    var $mask_position = 0;// 水印位置    
    var $mask_img_pct = 50;// 图片合并程度,值越大，合并程序越低    
    var $mask_txt_pct = 50;// 文字合并程度,值越小，合并程序越低    
    var $img_border_size = 0;// 图片边框尺寸    
    var $img_border_color;// 图片边框颜色    
    var $_flip_x=0;// 水平翻转次数    
    var $_flip_y=0;// 垂直翻转次数    
    var $cut_type=0;// 剪切类型    
     
    var $img_type;// 文件类型    
    // 文件类型定义,并指出了输出图片的函数    
    var $all_type = array(    
        "jpg"  => array("output"=>"imagejpeg"),    
        "gif"  => array("output"=>"imagegif"),    
        "png"  => array("output"=>"imagepng"),    
        "wbmp" => array("output"=>"image2wbmp"),    
        "jpeg" => array("output"=>"imagejpeg"));    
    /**   
     * 构造函数   
     */    
    function ThumbHandler()    
    {    
        $this->mask_font_color = "#ffffff";    
        $this->font = 2;    
        $this->font_size = 12;    
    }    
    /**   
     * 取得图片的宽   
     */    
    function getImgWidth($src)    
    {    
        return imagesx($src);    
    }    
    /**   
     * 取得图片的高   
     */    
    function getImgHeight($src)    
    {    
        return imagesy($src);    
    }    
    /**   
     * 设置图片生成路径   
     *   
     * @param    string    $src_img   图片生成路径   
     */    
    function setSrcImg($src_img, $img_type=null)    
    {    
        if(!file_exists($src_img))    
        {    
            die("图片不存在");    
        }    
        if(!empty($img_type))    
        {    
            $this->img_type = $img_type;    
        }    
        else    
        {    
            $this->img_type = $this->_getImgType($src_img);    
        }    
        $this->_checkValid($this->img_type);    
        // file_get_contents函数要求php版本>4.3.0    
        $src = '';    
        if(function_exists("file_get_contents"))    
        {    
            $src = file_get_contents($src_img);    
        }    
        else    
        {    
            $handle = fopen ($src_img, "r");    
            while (!feof ($handle))    
            {    
                $src .= fgets($fd, 4096);    
            }    
            fclose ($handle);    
        }    
        if(empty($src))    
        {    
            die("图片源为空");    
        }    
        $this->h_src = @ImageCreateFromString($src);    
        $this->src_w = $this->getImgWidth($this->h_src);    
        $this->src_h = $this->getImgHeight($this->h_src);    
    }    
    /**   
     * 设置图片生成路径   
     *   
     * @param    string    $dst_img   图片生成路径   
     */    
    function setDstImg($dst_img)    
    {    
        $arr  = explode('/',$dst_img);    
        $last = array_pop($arr);    
        $path = implode('/',$arr);    
        $this->_mkdirs($path);    
        $this->dst_img = $dst_img;    
    }    
    /**   
     * 设置图片的显示质量   
     *   
     * @param    string      $n    质量   
     */    
    function setImgDisplayQuality($n)    
    {    
        $this->img_display_quality = (int)$n;    
    }    
    /**   
     * 设置图片的生成质量   
     *   
     * @param    string      $n    质量   
     */    
    function setImgCreateQuality($n)    
    {    
        $this->img_create_quality = (int)$n;    
    }    
    /**   
     * 设置文字水印   
     *   
     * @param    string     $word    水印文字   
     * @param    integer    $font    水印字体   
     * @param    string     $color   水印字体颜色   
     */    
    function setMaskWord($word)    
    {    
        $this->mask_word .= $word;    
    }    
    /**   
     * 设置字体颜色   
     *   
     * @param    string     $color    字体颜色   
     */    
    function setMaskFontColor($color="#ffffff")    
    {    
        $this->mask_font_color = $color;    
    }    
    /**   
     * 设置水印字体   
     *   
     * @param    string|integer    $font    字体   
     */    
    function setMaskFont($font=2)    
    {    
        if(!is_numeric($font) && !file_exists($font))    
        {    
            die("字体文件不存在");    
        }    
        $this->font = $font;    
    }    
    /**   
     * 设置文字字体大小,仅对truetype字体有效   
     */    
    function setMaskFontSize($size = "12")    
    {    
        $this->font_size = $size;    
    }    
    /**   
     * 设置图片水印   
     *   
     * @param    string    $img     水印图片源   
     */    
    function setMaskImg($img)    
    {    
        $this->mask_img = $img;    
    }    
    /**   
     * 设置水印横向偏移   
     *   
     * @param    integer     $x    横向偏移量   
     */    
    function setMaskOffsetX($x)    
    {    
        $this->mask_offset_x = (int)$x;    
    }    
    /**   
     * 设置水印纵向偏移   
     *   
     * @param    integer     $y    纵向偏移量   
     */    
    function setMaskOffsetY($y)    
    {    
        $this->mask_offset_y = (int)$y;    
    }    
    /**   
     * 指定水印位置   
     *   
     * @param    integer     $position    位置,1:左上,2:左下,3:右上,0/4:右下   
     */    
    function setMaskPosition($position=0)    
    {    
        $this->mask_position = (int)$position;    
    }    
    /**   
     * 设置图片合并程度   
     *   
     * @param    integer     $n    合并程度   
     */    
    function setMaskImgPct($n)    
    {    
        $this->mask_img_pct = (int)$n;    
    }    
    /**   
     * 设置文字合并程度   
     *   
     * @param    integer     $n    合并程度   
     */    
    function setMaskTxtPct($n)    
    {    
        $this->mask_txt_pct = (int)$n;    
    }    
    /**   
     * 设置缩略图边框   
     *   
     * @param    (类型)     (参数名)    (描述)   
     */    
    function setDstImgBorder($size=1, $color="#000000")    
    {    
        $this->img_border_size  = (int)$size;    
        $this->img_border_color = $color;    
    }    
    /**   
     * 水平翻转   
     */    
    function flipH()    
    {    
        $this->_flip_x++;    
    }    
    /**   
     * 垂直翻转   
     */    
    function flipV()    
    {    
        $this->_flip_y++;    
    }    
    /**   
     * 设置剪切类型   
     *   
     * @param    (类型)     (参数名)    (描述)   
     */    
    function setCutType($type)    
    {    
        $this->cut_type = (int)$type;    
    }    
    /**   
     * 设置图片剪切   
     *   
     * @param    integer     $width    矩形剪切   
     */    
    function setRectangleCut($width, $height)    
    {    
        $this->fill_w = (int)$width;    
        $this->fill_h = (int)$height;    
    }    
    /**   
     * 设置源图剪切起始坐标点   
     *   
     * @param    (类型)     (参数名)    (描述)   
     */    
    function setSrcCutPosition($x, $y)    
    {    
        $this->src_x  = (int)$x;    
        $this->src_y  = (int)$y;    
    }    
    /**   
     * 创建图片,主函数   
     * @param    integer    $a     当缺少第二个参数时，此参数将用作百分比，   
     *                             否则作为宽度值   
     * @param    integer    $b     图片缩放后的高度   
     */    
    function createImg($a, $b=null)    
    {    
        $num = func_num_args();    
        if(1 == $num)    
        {    
            $r = (int)$a;    
            if($r < 1)    
            {    
                die("图片缩放比例不得小于1");    
            }    
            $this->img_scale = $r;    
            $this->_setNewImgSize($r);    
        }    
        if(2 == $num)    
        {    
            $w = (int)$a;    
            $h = (int)$b;    
            if(0 == $w)    
            {    
                die("目标宽度不能为0");    
            }    
            if(0 == $h)    
            {    
                die("目标高度不能为0");    
            }    
            $this->_setNewImgSize($w, $h);    
        }    
        if($this->_flip_x%2!=0)    
        {    
            $this->_flipH($this->h_src);    
        }    
        if($this->_flip_y%2!=0)    
        {    
            $this->_flipV($this->h_src);    
        }    
        $this->_createMask();    
        $this->_output();    
        // 释放    
        if(imagedestroy($this->h_src) && imagedestroy($this->h_dst))    
        {    
            Return true;    
        }    
        else    
        {    
            Return false;    
        }    
    }    
    /**   
     * 生成水印,调用了生成水印文字和水印图片两个方法   
     */    
    function _createMask()    
    {    
        if($this->mask_word)    
        {    
            // 获取字体信息    
            $this->_setFontInfo();    
            if($this->_isFull())    
            {    
                die("水印文字过大");    
            }    
            else    
            {    
                $this->h_dst = imagecreatetruecolor($this->dst_w, $this->dst_h);    
                $white = ImageColorAllocate($this->h_dst,255,255,255);    
                imagefilledrectangle($this->h_dst,0,0,$this->dst_w,$this->dst_h,$white);// 填充背景色    
                $this->_drawBorder();    
                imagecopyresampled( $this->h_dst, $this->h_src,    
                                    $this->start_x, $this->start_y,    
                                    $this->src_x, $this->src_y,    
                                    $this->fill_w, $this->fill_h,    
                                    $this->copy_w, $this->copy_h);    
                $this->_createMaskWord($this->h_dst);    
            }    
        }    
        if($this->mask_img)    
        {    
            $this->_loadMaskImg();//加载时，取得宽高    
            if($this->_isFull())    
            {    
                // 将水印生成在原图上再拷    
                $this->_createMaskImg($this->h_src);    
                $this->h_dst = imagecreatetruecolor($this->dst_w, $this->dst_h);    
                $white = ImageColorAllocate($this->h_dst,255,255,255);    
                imagefilledrectangle($this->h_dst,0,0,$this->dst_w,$this->dst_h,$white);// 填充背景色    
                $this->_drawBorder();    
                imagecopyresampled( $this->h_dst, $this->h_src,    
                                    $this->start_x, $this->start_y,    
                                    $this->src_x, $this->src_y,    
                                    $this->fill_w, $this->start_y,    
                                    $this->copy_w, $this->copy_h);    
            }    
            else    
            {    
                // 创建新图并拷贝    
                $this->h_dst = imagecreatetruecolor($this->dst_w, $this->dst_h);    
                $white = ImageColorAllocate($this->h_dst,255,255,255);    
                imagefilledrectangle($this->h_dst,0,0,$this->dst_w,$this->dst_h,$white);// 填充背景色    
                $this->_drawBorder();    
                imagecopyresampled( $this->h_dst, $this->h_src,    
                                    $this->start_x, $this->start_y,    
                                    $this->src_x, $this->src_y,    
                                    $this->fill_w, $this->fill_h,    
                                    $this->copy_w, $this->copy_h);    
                $this->_createMaskImg($this->h_dst);    
            }    
        }    
        if(empty($this->mask_word) && empty($this->mask_img))    
        {    
            $this->h_dst = imagecreatetruecolor($this->dst_w, $this->dst_h);    
            $white = ImageColorAllocate($this->h_dst,255,255,255);    
            imagefilledrectangle($this->h_dst,0,0,$this->dst_w,$this->dst_h,$white);// 填充背景色    
            $this->_drawBorder();    
            imagecopyresampled( $this->h_dst, $this->h_src,    
                        $this->start_x, $this->start_y,    
                        $this->src_x, $this->src_y,    
                        $this->fill_w, $this->fill_h,    
                        $this->copy_w, $this->copy_h);    
        }    
    }    
    /**   
     * 画边框   
     */    
    function _drawBorder()    
    {    
        if(!empty($this->img_border_size))    
        {    
            $c = $this->_parseColor($this->img_border_color);    
            $color = ImageColorAllocate($this->h_src,$c[0], $c[1], $c[2]);    
            imagefilledrectangle($this->h_dst,0,0,$this->dst_w,$this->dst_h,$color);// 填充背景色    
        }    
    }    
    /**   
     * 生成水印文字   
     */    
    function _createMaskWord($src)    
    {    
        $this->_countMaskPos();    
        $this->_checkMaskValid();    
        $c = $this->_parseColor($this->mask_font_color);    
        $color = imagecolorallocatealpha($src, $c[0], $c[1], $c[2], $this->mask_txt_pct);    
        if(is_numeric($this->font))    
        {    
            imagestring($src,    
                        $this->font,    
                        $this->mask_pos_x, $this->mask_pos_y,    
                        $this->mask_word,    
                        $color);    
        }    
        else    
        {    
            imagettftext($src,    
                        $this->font_size, 0,    
                        $this->mask_pos_x, $this->mask_pos_y,    
                        $color,    
                        $this->font,    
                        $this->mask_word);    
        }    
    }    
    /**   
     * 生成水印图   
     */    
    function _createMaskImg($src)    
    {    
        $this->_countMaskPos();    
        $this->_checkMaskValid();    
        imagecopymerge($src,    
                        $this->h_mask,    
                        $this->mask_pos_x ,$this->mask_pos_y,    
                        0, 0,    
                        $this->mask_w, $this->mask_h,    
                        $this->mask_img_pct);    
        imagedestroy($this->h_mask);    
    }    
    /**   
     * 加载水印图   
     */    
    function _loadMaskImg()    
    {    
        $mask_type = $this->_getImgType($this->mask_img);    
        $this->_checkValid($mask_type);    
        // file_get_contents函数要求php版本>4.3.0    
        $src = '';    
        if(function_exists("file_get_contents"))    
        {    
            $src = file_get_contents($this->mask_img);    
        }    
        else    
        {    
            $handle = fopen ($this->mask_img, "r");    
            while (!feof ($handle))    
            {    
                $src .= fgets($fd, 4096);    
            }    
            fclose ($handle);    
        }    
        if(empty($this->mask_img))    
        {    
            die("水印图片为空");    
        }    
        $this->h_mask = ImageCreateFromString($src);    
        $this->mask_w = $this->getImgWidth($this->h_mask);    
        $this->mask_h = $this->getImgHeight($this->h_mask);    
    }    
    /**   
     * 图片输出   
     */    
    function _output()    
    {    
        $img_type  = $this->img_type;    
        $func_name = $this->all_type[$img_type]['output'];    
        if(function_exists($func_name))    
        {    
            // 判断浏览器,若是IE就不发送头    
            if(isset($_SERVER['HTTP_USER_AGENT']))    
            {    
                $ua = strtoupper($_SERVER['HTTP_USER_AGENT']);    
                if(!preg_match('/^.*MSIE.*\)$/i',$ua))    
                {    
                    header("Content-type:$img_type");    
                }    
            }    
            $func_name($this->h_dst, $this->dst_img, $this->img_display_quality);    
        }    
        else    
        {    
            Return false;    
        }    
    }    
    /**   
     * 分析颜色   
     *   
     * @param    string     $color    十六进制颜色   
     */    
    function _parseColor($color)    
    {    
        $arr = array();    
        for($ii=1; $ii<strlen function="" return="" this-="">_isFull())    
        {    
            switch($this->mask_position)    
            {    
                case 1:    
                    // 左上    
                    $this->mask_pos_x = $this->mask_offset_x + $this->img_border_size;    
                    $this->mask_pos_y = $this->mask_offset_y + $this->img_border_size;    
                    break;    
                case 2:    
                    // 左下    
                    $this->mask_pos_x = $this->mask_offset_x + $this->img_border_size;    
                    $this->mask_pos_y = $this->src_h - $this->mask_h - $this->mask_offset_y;    
                    break;    
                case 3:    
                    // 右上    
                    $this->mask_pos_x = $this->src_w - $this->mask_w - $this->mask_offset_x;    
                    $this->mask_pos_y = $this->mask_offset_y + $this->img_border_size;    
                    break;    
                case 4:    
                    // 右下    
                    $this->mask_pos_x = $this->src_w - $this->mask_w - $this->mask_offset_x;    
                    $this->mask_pos_y = $this->src_h - $this->mask_h - $this->mask_offset_y;    
                    break;    
                default:    
                    // 默认将水印放到右下,偏移指定像素    
                    $this->mask_pos_x = $this->src_w - $this->mask_w - $this->mask_offset_x;    
                    $this->mask_pos_y = $this->src_h - $this->mask_h - $this->mask_offset_y;    
                    break;    
            }    
        }    
        else    
        {    
            switch($this->mask_position)    
            {    
                case 1:    
                    // 左上    
                    $this->mask_pos_x = $this->mask_offset_x + $this->img_border_size;    
                    $this->mask_pos_y = $this->mask_offset_y + $this->img_border_size;    
                    break;    
                case 2:    
                    // 左下    
                    $this->mask_pos_x = $this->mask_offset_x + $this->img_border_size;    
                    $this->mask_pos_y = $this->dst_h - $this->mask_h - $this->mask_offset_y - $this->img_border_size;    
                    break;    
                case 3:    
                    // 右上    
                    $this->mask_pos_x = $this->dst_w - $this->mask_w - $this->mask_offset_x - $this->img_border_size;    
                    $this->mask_pos_y = $this->mask_offset_y + $this->img_border_size;    
                    break;    
                case 4:    
                    // 右下    
                    $this->mask_pos_x = $this->dst_w - $this->mask_w - $this->mask_offset_x - $this->img_border_size;    
                    $this->mask_pos_y = $this->dst_h - $this->mask_h - $this->mask_offset_y - $this->img_border_size;    
                    break;    
                default:    
                    // 默认将水印放到右下,偏移指定像素    
                    $this->mask_pos_x = $this->dst_w - $this->mask_w - $this->mask_offset_x - $this->img_border_size;    
                    $this->mask_pos_y = $this->dst_h - $this->mask_h - $this->mask_offset_y - $this->img_border_size;    
                    break;    
            }    
        }    
    }    
    /**   
     * 设置字体信息   
     */    
    function _setFontInfo()    
    {    
        if(is_numeric($this->font))    
        {    
            $this->font_w  = imagefontwidth($this->font);    
            $this->font_h  = imagefontheight($this->font);    
            // 计算水印字体所占宽高    
            $word_length   = strlen($this->mask_word);    
            $this->mask_w  = $this->font_w*$word_length;    
            $this->mask_h  = $this->font_h;    
        }    
        else    
        {    
            $arr = imagettfbbox ($this->font_size,0, $this->font,$this->mask_word);    
            $this->mask_w  = abs($arr[0] - $arr[2]);    
            $this->mask_h  = abs($arr[7] - $arr[1]);    
        }    
    }    
    /**   
     * 设置新图尺寸   
     *   
     * @param    integer     $img_w   目标宽度   
     * @param    integer     $img_h   目标高度   
     */    
    function _setNewImgSize($img_w, $img_h=null)    
    {    
        $num = func_num_args();    
        if(1 == $num)    
        {    
            $this->img_scale = $img_w;// 宽度作为比例    
            $this->fill_w = round($this->src_w * $this->img_scale / 100) - $this->img_border_size*2;    
            $this->fill_h = round($this->src_h * $this->img_scale / 100) - $this->img_border_size*2;    
            // 源文件起始坐标    
            $this->src_x  = 0;    
            $this->src_y  = 0;    
            $this->copy_w = $this->src_w;    
            $this->copy_h = $this->src_h;    
            // 目标尺寸    
            $this->dst_w   = $this->fill_w + $this->img_border_size*2;    
            $this->dst_h   = $this->fill_h + $this->img_border_size*2;    
        }    
        if(2 == $num)    
        {    
            $fill_w   = (int)$img_w - $this->img_border_size*2;    
            $fill_h   = (int)$img_h - $this->img_border_size*2;    
            if($fill_w < 0 || $fill_h < 0)    
            {    
                die("图片边框过大，已超过了图片的宽度");    
            }    
            $rate_w = $this->src_w/$fill_w;    
            $rate_h = $this->src_h/$fill_h;    
            switch($this->cut_type)    
            {    
                case 0:    
                    // 如果原图大于缩略图，产生缩小，否则不缩小    
                    if($rate_w < 1 && $rate_h < 1)    
                    {    
                        $this->fill_w = (int)$this->src_w;    
                        $this->fill_h = (int)$this->src_h;    
                    }    
                    else    
                    {    
                        if($rate_w >= $rate_h)    
                        {    
                            $this->fill_w = (int)$fill_w;    
                            $this->fill_h = round($this->src_h/$rate_w);    
                        }    
                        else    
                        {    
                            $this->fill_w = round($this->src_w/$rate_h);    
                            $this->fill_h = (int)$fill_h;    
                        }    
                    }    
                    $this->src_x  = 0;    
                    $this->src_y  = 0;    
                    $this->copy_w = $this->src_w;    
                    $this->copy_h = $this->src_h;    
                    // 目标尺寸    
                    $this->dst_w   = $this->fill_w + $this->img_border_size*2;    
                    $this->dst_h   = $this->fill_h + $this->img_border_size*2;    
                    break;    
                // 自动裁切    
                case 1:    
                    // 如果图片是缩小剪切才进行操作    
                    if($rate_w >= 1 && $rate_h >=1)    
                    {    
                        if($this->src_w > $this->src_h)    
                        {    
                            $src_x = round($this->src_w-$this->src_h)/2;    
                            $this->setSrcCutPosition($src_x, 0);    
                            $this->setRectangleCut($fill_h, $fill_h);    
                            $this->copy_w = $this->src_h;    
                            $this->copy_h = $this->src_h;    
                        }    
                        elseif($this->src_w < $this->src_h)    
                        {    
                            $src_y = round($this->src_h-$this->src_w)/2;    
                            $this->setSrcCutPosition(0, $src_y);    
                            $this->setRectangleCut($fill_w, $fill_h);    
                            $this->copy_w = $this->src_w;    
                            $this->copy_h = $this->src_w;    
                        }    
                        else    
                        {    
                            $this->setSrcCutPosition(0, 0);    
                            $this->copy_w = $this->src_w;    
                            $this->copy_h = $this->src_w;    
                            $this->setRectangleCut($fill_w, $fill_h);    
                        }    
                    }    
                    else    
                    {    
                        $this->setSrcCutPosition(0, 0);    
                        $this->setRectangleCut($this->src_w, $this->src_h);    
                        $this->copy_w = $this->src_w;    
                        $this->copy_h = $this->src_h;    
                    }    
                    // 目标尺寸    
                    $this->dst_w   = $this->fill_w + $this->img_border_size*2;    
                    $this->dst_h   = $this->fill_h + $this->img_border_size*2;    
                    break;    
                // 手工裁切    
                case 2:    
                    $this->copy_w = $this->fill_w;    
                    $this->copy_h = $this->fill_h;    
                    // 目标尺寸    
                    $this->dst_w   = $this->fill_w + $this->img_border_size*2;    
                    $this->dst_h   = $this->fill_h + $this->img_border_size*2;                   
                    break;    
                default:    
                    break;    
            }    
        }    
        // 目标文件起始坐标    
        $this->start_x = $this->img_border_size;    
        $this->start_y = $this->img_border_size;    
    }    
    /**   
     * 检查水印图是否大于生成后的图片宽高   
     */    
    function _isFull()    
    {    
        Return (   $this->mask_w + $this->mask_offset_x > $this->fill_w    
                || $this->mask_h + $this->mask_offset_y > $this->fill_h)    
                   ?true:false;    
    }    
    /**   
     * 检查水印图是否超过原图   
     */    
    function _checkMaskValid()    
    {    
        if(    $this->mask_w + $this->mask_offset_x > $this->src_w    
            || $this->mask_h + $this->mask_offset_y > $this->src_h)    
        {    
            die("水印图片尺寸大于原图，请缩小水印图");    
        }    
    }    
    /**   
     * 取得图片类型   
     *   
     * @param    string     $file_path    文件路径   
     */    
    function _getImgType($file_path)    
    {    
        $type_list = array("1"=>"gif","2"=>"jpg","3"=>"png","4"=>"swf","5" => "psd","6"=>"bmp","15"=>"wbmp");    
        if(file_exists($file_path))    
        {    
            $img_info = @getimagesize ($file_path);    
            if(isset($type_list[$img_info[2]]))    
            {    
                Return $type_list[$img_info[2]];    
            }    
        }    
        else    
        {    
            die("文件不存在,不能取得文件类型!");    
        }    
    }    
    /**   
     * 检查图片类型是否合法,调用了array_key_exists函数，此函数要求   
     * php版本大于4.1.0   
     *   
     * @param    string     $img_type    文件类型   
     */    
    function _checkValid($img_type)    
    {    
        if(!array_key_exists($img_type, $this->all_type))    
        {    
            Return false;    
        }    
    }    
    /**   
     * 按指定路径生成目录   
     *   
     * @param    string     $path    路径   
     */    
    function _mkdirs($path)    
    {    
        $adir = explode('/',$path);    
        $dirlist = '';    
        $rootdir = array_shift($adir);    
        if(($rootdir!='.'||$rootdir!='..')&&!file_exists($rootdir))    
        {    
            @mkdir($rootdir);    
        }    
        foreach($adir as $key=>$val)    
        {    
            if($val!='.'&&$val!='..')    
            {    
                $dirlist .= "/".$val;    
                $dirpath = $rootdir.$dirlist;    
                if(!file_exists($dirpath))    
                {    
                    @mkdir($dirpath);    
                    @chmod($dirpath,0777);    
                }    
            }    
        }    
    }    
    /**   
     * 垂直翻转   
     *   
     * @param    string     $src    图片源   
     */    
    function _flipV($src)    
    {    
        $src_x = $this->getImgWidth($src);    
        $src_y = $this->getImgHeight($src);    
        $new_im = imagecreatetruecolor($src_x, $src_y);    
        for ($y = 0; $y < $src_y; $y++)    
        {    
            imagecopy($new_im, $src, 0, $src_y - $y - 1, 0, $y, $src_x, 1);    
        }    
        $this->h_src = $new_im;    
    }    
    /**   
     * 水平翻转   
     *   
     * @param    string     $src    图片源   
     */    
    function _flipH($src)    
    {    
        $src_x = $this->getImgWidth($src);    
        $src_y = $this->getImgHeight($src);    
        $new_im = imagecreatetruecolor($src_x, $src_y);    
        for ($x = 0; $x < $src_x; $x++)    
        {    
            imagecopy($new_im, $src, $src_x - $x - 1, 0, $x, 0, 1, $src_y);    
        }    
        $this->h_src = $new_im;    
    }    
}    
?>

函数描述及例子

使用实例:   

< ?php    
require_once('lib/thumb.class.php');    $t = new ThumbHandler();    
$t->setSrcImg("img/test.jpg");    
$t->setDstImg("tmp/new_test.jpg");    
$t->setMaskImg("img/test.gif");    
$t->setMaskPosition(1);    
$t->setMaskImgPct(80);    
$t->setDstImgBorder(4,"#dddddd");    
// 指定缩放比例    
$t->createImg(300,200);    
?> 

<?php    
require_once('lib/thumb.class.php');    $t = new ThumbHandler();    
// 基本使用    
$t--->setSrcImg("img/test.jpg");    
$t->setMaskWord("test");    
$t->setDstImgBorder(10,"#dddddd");    
// 指定缩放比例    
$t->createImg(50);    
?>

<?php    
equire_once('lib/thumb.class.php');    $t = new ThumbHandler();    
// 基本使用    
$t--->setSrcImg("img/test.jpg");    
$t->setMaskWord("test");    
// 指定固定宽高    
$t->createImg(200,200);    
?>   

<?php    
require_once('lib/thumb.class.php');    $t = new ThumbHandler();    
$t--->setSrcImg("img/test.jpg");    
$t->setDstImg("tmp/new_test.jpg");    
$t->setMaskWord("test");    
// 指定固定宽高    
$t->createImg(200,200);    
?>  

<?php    
require_once('lib/thumb.class.php');    $t = new ThumbHandler();    
$t--->setSrcImg("img/test.jpg");    
// 指定字体文件地址    
$t->setMaskFont("c:/winnt/fonts/arial.ttf");    
$t->setMaskFontSize(20);    
$t->setMaskFontColor("#ffff00");    
$t->setMaskWord("test3333333");    
$t->setDstImgBorder(99,"#dddddd");    
$t->createImg(50);   
?>   

<?php    
require_once('lib/thumb.class.php');    $t = new ThumbHandler();    
$t->setSrcImg("img/test.jpg");    
$t->setMaskOffsetX(55);    
$t->setMaskOffsetY(55);    
$t->setMaskPosition(1);    
//$t->setMaskPosition(2);    
//$t->setMaskPosition(3);    
//$t->setMaskPosition(4);    
$t->setMaskFontColor("#ffff00");    
$t->setMaskWord("test");    
// 指定固定宽高    
$t->createImg(50);    
?>   

<?php    
require_once('lib/thumb.class.php');    $t = new ThumbHandler();    
$t->setSrcImg("img/test.jpg");    
$t->setMaskFont("c:/winnt/fonts/simyou.ttf");    
$t->setMaskFontSize(20);    
$t->setMaskFontColor("#ffffff");    
$t->setMaskTxtPct(20);    
$t->setDstImgBorder(10,"#dddddd");    
$text = "中文";    
$str = mb_convert_encoding($text, "UTF-8", "gb2312");    
$t->setMaskWord($str);    
$t->setMaskWord("test");    
// 指定固定宽高    
$t->createImg(50);    
?> </strlen>