php给图片加水印四

<?

 /**
     * 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->fill_h,
                                    $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; $ii<strlen ($color); $ii++)
        {
            $arr[] = hexdec(substr($color,$ii,2));
            $ii++;
        }
 
        Return $arr;
    }
 
    /**
     * 计算出位置坐标
     */
   ?>

补充：Php教程,Php常用代码

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