欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

php 方便水印和缩略图的图形类

程序员文章站 2023-11-09 21:45:28
复制代码 代码如下:
复制代码 代码如下:

<?php

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

class img {
    function __construct($arg = null) {
        $args = func_get_args();
        if($arg == null) {
            return null;
        }
        $this->im = call_user_func_array(array($this,'create'),$args);
    }

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

    /*
    *创建图像
    *@param string/int 图片文件路径或者宽度
    *@param int 高度,可省略
    *@param string 6位16进制整数
    */
    function create($arg = null) {
        $args = func_get_args();
        if(is_file($args[0])) {
            $this->file = $args[0];
            $size = getimagesize($this->file) or error('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)$args[0]>0 and (int)$args[1]>0) {
            $im = imagecreatetruecolor((int)$args[0],(int)$args[1]) or error("对不起,参数错误!");
            if(!$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
    *@param int $w 新图片的宽度
    *@param int $h 新图片的宽度
    *@param string/bool $color 可选,新图片的背景色,false或空为透明
    *@param bool $lashen 可选,是否拉伸,默认不拉伸
    */
    function suolue($w = null,$h = null,$color = false,$lashen = false) {
        $w_o = imagesx($this->im);
        $h_o = imagesy($this->im);
        if($w == null and $h != null) {
            $w = $h * $w_o/$h_o;
        }elseif ($w != null and $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
    *@param string $str 要写的字符串
    *@param array $arg 字符串相关的参数,为一个关联数组,left 为距左边距离,right为距右边距离,left优先,top为距顶部距离,bottom为距底部距离,top优先;angle为角度,color为6位数16进制颜色,touming为文字透明度,font为字体文件
    */
    function write($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)
    *@param string/resource $file 图片文件路径或这图片标识符
    *@param array $arg 字符串相关的参数,为一个关联数组,left 为距左边距离,right为距右边距离,left优先,top为距顶部距离,bottom为距底部距离,top优先;touming为文字透明度
    */
    function merge($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
    *@param string $type
    *@param string $filename 要转存的文件路径
    *@param int $zhiliang jpeg图片特有的,图像清晰度
    */
    function display($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);
    }

    function randcolor($a,$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;
    }
}

/*
function error($msg,$debug = false) {
    $err = new exception($msg);
    $str = "<pre>\n<span style="color:red" style="color:red">错误:</span>\n".print_r($err->gettrace(),1)."\n</pre>";
    if($debug == true) {
        file_put_contents(date('y-m-d').".log",$str);
        return $str;
    }else{
        die($str);
    }
}
*/
?>

这是简单的用法实例
复制代码 代码如下:

$img = new img('a.png');
$m = $img->im;
$im = $img->suolue(100);
$img->im = $m;
$img->suolue(300);
$img->merge($m,array('left'=>0,'top'=>0,'touming'=>60));
$img->merge($im,array('right'=>0,'top'=>0,'touming'=>60));
$img->merge($im,array('left'=>0,'bottom'=>0,'touming'=>60));
$img->merge($im,array('right'=>0,'bottom'=>0,'touming'=>60));

$img->write("春天来了",array('left'=>0,'top'=>0,'size'=>30,'color'=>$img->randcolor(0,180),'angle'=>-45,'font'=>'simfang.ttf','touming'=>80));
$img->write("春天来了",array('left'=>0,'bottom'=>0,'size'=>30,'color'=>$img->randcolor(0,180),'angle'=>45,'font'=>'simfang.ttf','touming'=>80));
$img->write("春天来了",array('right'=>0,'bottom'=>0,'size'=>30,'color'=>$img->randcolor(0,180),'angle'=>-45,'font'=>'simfang.ttf','touming'=>80));
$img->write("春天来了",array('right'=>0,'top'=>0,'size'=>30,'color'=>$img->randcolor(0,180),'angle'=>45,'font'=>'simfang.ttf','touming'=>80));
$img->display("gif");