php图片文字合成-海报生成

图片合成方法

/**
 * 生成宣传海报
 * @param array 参数,包括图片和文字
 * @param string $filename 生成海报文件名,不传此参数则不生成文件,直接输出图片
 * @return [type] [description]
 */
function imgTextMerge($config=array(),$filename=""){
    //如果要看报什么错,可以先注释调这个header
    if(empty($filename)) header("content-type: image/png");
    $imageDefault = array(
        'left'=>0,
        'top'=>0,
        'right'=>0,
        'bottom'=>0,
        'width'=>100,
        'height'=>100,
        'opacity'=>100
    );
    $textDefault = array(
        'text'=>'',
        'left'=>0,
        'top'=>0,
        'fontSize'=>32, //字号
        'fontColor'=>'255,255,255', //字体颜色
        'angle'=>0,
    );
    $background = $config['background'];//海报最底层得背景
    //背景方法
    $backgroundInfo = getimagesize($background);
    $backgroundFun = 'imagecreatefrom'.image_type_to_extension($backgroundInfo[2], false);
    $background = $backgroundFun($background);
    $backgroundWidth = imagesx($background); //背景宽度
    $backgroundHeight = imagesy($background); //背景高度
    $imageRes = imageCreatetruecolor($backgroundWidth,$backgroundHeight);
    $color = imagecolorallocate($imageRes, 255, 255, 255);
    imagefill($imageRes, 0, 0, $color);
    // imageColorTransparent($imageRes, $color); //颜色透明
    imagecopyresampled($imageRes,$background,0,0,0,0,imagesx($background),imagesy($background),imagesx($background),imagesy($background));
    //处理了图片
    if(!empty($config['image'])){
        foreach ($config['image'] as $key => $val) {
            $val = array_merge($imageDefault,$val);
            $info = getimagesize($val['url']);
            $function = 'imagecreatefrom'.image_type_to_extension($info[2], false);
            if($val['stream']){ //如果传的是字符串图像流
                $info = getimagesizefromstring($val['url']);
                $function = 'imagecreatefromstring';
            }
            $res = $function($val['url']);
            $resWidth = $info[0];
            $resHeight = $info[1];
            //建立画板 ,缩放图片至指定尺寸
            $canvas=imagecreatetruecolor($val['width'], $val['height']);
            imagefill($canvas, 0, 0, $color);
            //关键函数,参数(目标资源,源,目标资源的开始坐标x,y, 源资源的开始坐标x,y,目标资源的宽高w,h,源资源的宽高w,h)
            imagecopyresampled($canvas, $res, 0, 0, 0, 0, $val['width'], $val['height'],$resWidth,$resHeight);
            $val['left'] = $val['left']<0?$backgroundWidth- abs($val['left']) - $val['width']:$val['left'];
            $val['top'] = $val['top']<0?$backgroundHeight- abs($val['top']) - $val['height']:$val['top'];
            //放置图像
            imagecopymerge($imageRes,$canvas, $val['left'],$val['top'],$val['right'],$val['bottom'],$val['width'],$val['height'],$val['opacity']);//左,上,右,下,宽度,高度,透明度
        }
    }
    //处理文字
    if(!empty($config['text'])){
        foreach ($config['text'] as $key => $val) {
            $val = array_merge($textDefault,$val);
            list($R,$G,$B) = explode(',', $val['fontColor']);
            $fontColor = imagecolorallocate($imageRes, $R, $G, $B);
            $val['left'] = $val['left']<0?$backgroundWidth- abs($val['left']):$val['left'];
            $val['top'] = $val['top']<0?$backgroundHeight- abs($val['top']):$val['top'];

            $text = $val['text'];
            $fontSize = $val['fontSize'];
            $angle = $val['angle'];
            $fontPath = $val['fontPath'];
            $width = $val['width'];
            $outStyle = $val['outStyle'];
            $suffix = isset($val['suffix'])?$val['suffix']:'';
            $text = $this->textWidth($fontSize,$angle,$fontPath,$text,$width,$outStyle,$suffix);

            imagettftext($imageRes,$val['fontSize'],$val['angle'],$val['left'],$val['top'],$fontColor,$val['fontPath'],$text);
        }
    }
    //生成图片
    if(!empty($filename)){
        $res = imagejpeg($imageRes,$filename,100); //保存到本地
        imagedestroy($imageRes);
        if(!$res) return false;
        return $filename;
    }else{
        imagejpeg($imageRes); //在浏览器上显示
        imagedestroy($imageRes);
    }
}
/**
 * 文字超出宽度
 * @param $fontsize //字体大小
 * @param $angle //角度
 * @param $fontface //字体名称
 * @param $string //字符串
 * @param $width //预设宽度
 * @param $outStyle //超出宽度操作类型(wrap:换行 hidden:隐藏 replace:替换)
 * @param $suffix //outStyle值为replace时,替换的内容
 * @return string
 */
function textWidth($fontsize, $angle, $fontface, $string, $width, $outStyle = 'replace', $suffix = '...') {
    $content = "";

    // 将字符串拆分成一个个单字 保存到数组 letter 中
    for ($i=0;$i<mb_strlen($string);$i++) {
        $letter[] = mb_substr($string, $i, 1);
    }

    foreach ($letter as $l) {
        $teststr = $content.$l;
        $testbox = imagettfbbox($fontsize, $angle, $fontface, $teststr);
        // 判断拼接后的字符串是否超过预设的宽度
        $is_width = false;//是否超出宽度
        if (($testbox[2] > $width) && ($content !== "") && $width != 0) {
            $is_width = true;
        }
        if ($outStyle == 'wrap'){//超出换行
            if ($is_width) $content .= "\n";
        }elseif ($outStyle == 'hidden'){//超出隐藏
            if ($is_width) break;
        }elseif ($outStyle == 'replace'){//超出替换内容
            if ($is_width){$content .= $suffix; break;}
        }
        $content .= $l;
    }
    return $content;
}

 

调用图片合成

public function test(){
    $config = array(
        'text'=>array(
            array(
                'text'=>'标题',
                'left'=>50,
                'top'=>700,
                'fontPath'=>'/font/siyuan.ttf', //字体文件
                'fontSize'=>32, //字号
                'fontColor'=>'0,0,0', //字体颜色
                'angle'=>0,
                'width'=>700,//文字超出宽度换行或隐藏,0不限制
                'outStyle'=>'wrap',//超出宽度操作类型(wrap:换行 hidden:隐藏 replace:替换)
            ),
            array(
                'text'=>'用户名',
                'left'=>50,
                'top'=>910,
                'fontPath'=>'/font/siyuan.ttf', //字体文件
                'fontSize'=>28, //字号
                'fontColor'=>'76,75,75', //字体颜色
                'angle'=>0,
                'width'=>450,//文字超出宽度换行或隐藏,0不限制
                'outStyle'=>'replace',//超出宽度操作类型(wrap:换行 hidden:隐藏 replace:替换)
                'suffix'=>'...',//outStyle值为replace时,替换的内容
            ),
        ),
        'image'=>array(
            array(
                'url'=>'/public/logo.png', //图片资源路径
                'left'=>50,
                'top'=>110,
                'right'=>0,
                'bottom'=>0,
                'width'=>700,
                'height'=>490,
                'stream'=>0, //图片资源是否是字符串图像流
                'opacity'=>100 //不透明度
            ),
            array(
                'url'=>'/public/qrcode.png',
                'left'=>530,
                'top'=>870,
                'right'=>0,
                'bottom'=>0,
                'width'=>220,
                'height'=>220,
                'stream'=>0, //图片资源是否是字符串图像流
                'opacity'=>100 //不透明度
            ),
        ),
        'background'=>'/public/bg.png',
    );

    $filename = '/uploads/'.time().'.jpg';
    $this->imgTextMerge($config,$filename);
}

 

posted @ 2021-09-13 16:05  王顺波  阅读(836)  评论(0编辑  收藏  举报