php方便水印和缩略图的图形类

<?php

/*
*@author    夜无眠    27262681@qq.com
*copyright    http://www.gowake.cn
*/

classimg{
    function__construct($arg=null){
        $args=func_get_args();
        if($arg==null){
            returnnull;
        }
        $this->im=call_user_func_array(array($this,"create"),$args);
    }

    function__call($func,$arg){
        if(function_exists("image".$func)){
            $funcstr="image".$func;
        }elseif(function_exists($func)){
            $funcstr=$func;
        }else{
            error("没有这个类方法或函数");
        }
        returncall_user_func_array($funcstr,$arg);
    }

    /*
    *创建图像
    *@paramstring/int图片文件路径或者宽度
    *@paramint高度，可省略
    *@paramstring6位16进制整数
    */
    functioncreate($arg=null){
        $args=func_get_args();
        if(is_file($args[0])){
            $this->file=$args[0];
            $size=getimagesize($this->file)orerror("图片类型错误");
            $this->size=$this->size?$this->size:$size;
            $type=image_type_to_extension($size[2],false);
            $this->type=$this->type?$this->type:$type;
            $createfunc="imagecreatefrom".$type;
            $im=$createfunc($this->file);
        }elseif((int)$args[0]>0and(int)$args[1]>0){
            $im=imagecreatetruecolor((int)$args[0],(int)$args[1])orerror("对不起，参数错误！");
            if(!$args[2]){
                $color=hexdec("7fffffff");
                imagecolortransparent($im,$color);
            }else{
                $color=hexdec(str_replace("#","",$args[2]));
            }
            $this->size=$this->size?$this->size:array((int)$args[0],(int)$args[1]);
            imagefill($im,1,1,$color);
        }else{
            error("对不起，参数错误！");
        }
        //imagealphablending($im,false);//这两行用来记录透明通道
        imagesavealpha($im,true);
        imageinterlace($im,true);//开启隔行扫描
        return$im;
    }

    /*
    *生成缩略图
    *@paramint$w新图片的宽度
    *@paramint$h新图片的宽度
    *@paramstring/bool$color可选，新图片的背景色，false或空为透明
    *@parambool$lashen可选，是否拉伸，默认不拉伸
    */
    functionsuolue($w=null,$h=null,$color=false,$lashen=false){
        $w_o=imagesx($this->im);
        $h_o=imagesy($this->im);
        if($w==nulland$h!=null){
            $w=$h*$w_o/$h_o;
        }elseif($w!=nulland$h==null){
            $h=$w*$h_o/$w_o;
        }
        $this->size=null;
        $im=$this->create($w,$h,$color);
        $w_n=$w;
        $h_n=$h;
        if($w_o/$h_o>$w/$h){
            $h_n=$w*$h_o/$w_o;
            $y=($h-$h_n)/2;
        }elseif($w_o/$h_o<$w/$h){
            $w_n=$h*$w_o/$h_o;
            $x=($w-$w_n)/2;
        }
        if($lashen){
            $w_n=$w;
            $h_n=$h;
            $x=0;
            $y=0;
        }
        imagecopyresampled($im,$this->im,$x,$y,0,0,$w_n,$h_n,$w_o,$h_o);
        //imagedestroy($this->im);
        $this->im=$im;
        return$im;
    }

    /*
    *在图片上写字
    *@paramstring$str要写的字符串
    *@paramarray$arg字符串相关的参数，为一个关联数组，left为距左边距离，right为距右边距离，left优先，top为距顶部距离，bottom为距底部距离，top优先；angle为角度，color为6位数16进制颜色，touming为文字透明度，font为字体文件
    */
    functionwrite($str="",$arg=array()){
        $size=$arg["size"]?$arg["size"]:20;
        $angle=$arg["angle"]?$arg["angle"]:0;
        $color=$arg["color"]?$arg["color"]:"000000";
        $touming=$arg["touming"]?$arg["touming"]:100;
            $touming=dechex((100-$touming)*127/100);
            $color=hexdec($touming.str_replace("#","",$color));
        $font=$arg["font"]?$arg["font"]:"arial.ttf";
        $boxarr=imagettfbbox($size,$angle,$font,$str);
        $w=imagesx($this->im);
        $h=imagesy($this->im);

        $x_l=$x_r=$boxarr[0];
        $y_t=$y_b=$boxarr[1];
        for($i=0;$i<7;$i=$i+2){
            $x_l=$boxarr[$i]<$x_l?$boxarr[$i]:$x_l;
            $x_r=$boxarr[$i]>$x_r?$boxarr[$i]:$x_r;
            $y_t=$boxarr[$i+1]<$y_t?$boxarr[$i+1]:$y_t;
            $y_b=$boxarr[$i+1]>$y_b?$boxarr[$i+1]:$y_b;
        }
        $width=$x_r-$x_l;
        $height=$y_b-$y_t;

        /*获取精确偏移量*/
        $im=$this->create($width*4,$height*4);
        $tm=hexdec("7fffffff");
        imagettftext($im,$size,$angle,$width*2,$height*2,$color,$font,$str);
        for($i=0;$i<$width*4;$i++){
            for($ii=0;$ii<$height*4;$ii++){
                if(imagecolorat($im,$i,$ii)!=$tm){
                    $x_l=$i;
                    break(2);
                }
            }
        }
        for($i=0;$i<$height*4;$i++){
            for($ii=$x_l;$ii<$width*4;$ii++){
                if(imagecolorat($im,$ii,$i)!=$tm){
                    $y_t=$i;
                    break(2);
                }
            }
        }
        for($i=$width*4-1;$i>0;$i--){
            for($ii=$y_t;$ii<$height*4;$ii++){
                if(imagecolorat($im,$i,$ii)!=$tm){
                    $x_r=$i;
                    break(2);
                }
            }
        }
        for($i=$height*4-1;$i>0;$i--){
            for($ii=$x_l;$ii<=$x_r;$ii++){
                if(imagecolorat($im,$ii,$i)!=$tm){
                    $y_b=$i;
                    break(2);
                }
            }
        }
        $x_off=$x_l-$width*2;
        $y_off=$y_b-$height*2;
        $width=$x_r-$x_l;//精确宽度
        $height=$y_b-$y_t;//精确高度
        imagedestroy($im);

        if(isset($arg["left"])){
            $x=(int)$arg["left"]-$x_off;
        }elseif(isset($arg["right"])){
            $x=$w-(int)$arg["right"]-$width-$x_off;
        }else{
            $x=($w-$width)/2-$x_off;
        }
        if(isset($arg["top"])){
            $y=(int)$arg["top"]-$y_off+$height;
        }elseif(isset($arg["bottom"])){
            $y=$h-(int)$arg["bottom"]-$y_off;
        }else{
            $y=($h+$height)/2-$y_off;
        }

        imagettftext($this->im,$size,$angle,$x,$y,$color,$font,$str);
        return$this->im;
    }

    /*
    *合并图片（如图片水影）
    *@paramstring/resource$file图片文件路径或这图片标识符
    *@paramarray$arg字符串相关的参数，为一个关联数组，left为距左边距离，right为距右边距离，left优先，top为距顶部距离，bottom为距底部距离，top优先；touming为文字透明度
    */
    functionmerge($file,$arg=array()){
        if(is_file($file)){
            $imc=$this->create($file);
        }elseif(gettype($file)=="resource"){
            $imc=$file;
        }else{
            error("没有图片");
        }
        $touming=$arg["touming"]?(int)$arg["touming"]:100;
        $w=imagesx($this->im);
        $h=imagesy($this->im);
        $width=imagesx($imc);
        $height=imagesy($imc);
        if(isset($arg["left"])){
            $x=(int)$arg["left"];
        }elseif(isset($arg["right"])){
            $x=$w-(int)$arg["right"]-$width;
        }else{
            $x=($w-$width)/2;
        }
        if(isset($arg["top"])){
            $y=(int)$arg["top"];
        }elseif(isset($arg["bottom"])){
            $y=$h-$height-$arg["bottom"];
        }else{
            $y=($h-$height)/2;
        }
        imagecopymergegray($this->im,$imc,$x,$y,0,0,$width,$height,$touming);
    }

    /*
    *输出图片
    *@paramstring$type
    *@paramstring$filename要转存的文件路径
    *@paramint$zhiliangjpeg图片特有的，图像清晰度
    */
    functiondisplay($type=null,$filename=null,$zhiliang=null){
        if($type==null){
            $type=$this->type?$this->type:"jpg";
        }
        if(($type=="jpeg"or$type=="jpg")and$zhiliang==null){
            $type="jpeg";
            $zhiliang=100;
        }
        if($filename==null){
            header("Content-type:image/".$type);
        }
        $displayfunc="image".$type;
        $displayfunc($this->im,$filename,$zhiliang);
        imagedestroy($this->im);
    }

    functionrandcolor($a,$b){
        $a=$a>255?255:(int)$a;
        $a=$a<0?0:(int)$a;
        $b=$b>255?255:(int)$b;
        $b=$b<0?0:(int)$b;
        for($i=0;$i<3;$i++){
            $color.=str_pad(dechex(mt_rand($a,$b)),2,"0",STR_PAD_LEFT);
        }
        return$color;
    }
}

/*
functionerror($msg,$debug=false){
    $err=newException($msg);
    $str="<pre>\n<spanstyle="color:red"style="color:red">错误:</span>\n".print_r($err->getTrace(),1)."\n</pre>";
    if($debug==true){
        file_put_contents(date("Y-m-d").".log",$str);
        return$str;
    }else{
        die($str);
    }
}
*/
?>