<?php
namespace app\service;
class PosterService{
public static function create($config = [], $filename = ''){
$imageDefault = array(
'url'=>'图片路径'
'left' => 0,
'top' => 0,
'width' => 100,
'height' => 100,
'opacity' => 100,
'circle' => 0
);
$qrcodeDefault = [
'text' => '二维码内存',
'size' => 100,
'margin' => 2,
'left' => 0,
'top' => 0,
'color' => '0,0,0',
'callback' => function(){}
];
$textDefault = array(
'text' => '文字内存',
'left' => 0,
'top' => 0,
'align' => '',//center
'font-size' => 32,//字号
'color' => '0,0,0', //字体颜色
'angle' => 0,
'font-path' => '' //字体路径
);
$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, 0, 0, 0);
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($background));
if (!empty($config['qrcode'])){
foreach ($config['qrcode'] as $item){
$item = array_merge($qrcodeDefault, $item);
list($r,$b,$g) = explode(',', $item['color']);
$item['color'] = ['r' => $r, 'g' => $b, 'b' => $g];
$baseImage = imagecreatefromstring($item['callback']($item));
$resWidth = $resHeight = min(imagesx($baseImage), imagesy($baseImage));;
//建立画板 ，缩放图片至指定尺寸
$canvas = imagecreatetruecolor($item['size'], $item['size']);
// 码的背景颜色
$color = imagecolorallocate($canvas, 255, 255, 255);
// 设置透明背景
imagecolortransparent($canvas, $color);
imagefill($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, $baseImage, 0, 0, 0, 0, $item['size'], $item['size'],$resWidth, $resHeight);
imagecopymerge($imageRes, $canvas, $item['left'],$item['top'],0,0, $item['size'], $item['size'],100);
}
}
//处理了图片
if(!empty($config['image'])){
foreach ($config['image'] as $key => $val) {
$val = array_merge($imageDefault,$val);
$info = getimagesize($val['url']);
if($val['circle']){ //如果传的是字符串图像流
$canvas = self::imageRadius($val['url'], $val['width']/2);
}else{
$function = 'imagecreatefrom'.image_type_to_extension($info[2], false);
$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'], 0, 0, $val['width'], $val['height'],$val['opacity']);//左，上，右，下，宽度，高度，透明度
imagedestroy($canvas);
}
}
//处理文字
if(!empty($config['text'])){
foreach ($config['text'] as $key => $val) {
$val = array_merge($textDefault,$val);
list($R,$G,$B) = explode(',', $val['color']);
$color = imagecolorallocate($imageRes, $R, $G, $B);
$arr = imagettfbbox($val['font-size'],0,$val['font-path'],$val['text']);
$text_height = $arr[3] - $arr[5];
if ($val['align'] == 'center'){
$text_width = $arr[2]-$arr[0];
$val['left'] = ($backgroundWidth - $text_width)/2;
}else{
$val['left'] = $val['left'] < 0 ? $backgroundWidth- abs($val['left']):$val['left'];
}
$val['top'] = $val['top'] < 0 ? $backgroundHeight- abs($val['top']) : $val['top'];
$val['top'] += $text_height;
imagettftext($imageRes,$val['font-size'],$val['angle'],$val['left'],$val['top'],$color,$val['font-path'],$val['text']);
}
}
//生成图片
if(!empty($filename)){
if ($filename == 'base64'){
ob_start();
imagepng($imageRes);//在浏览器上显示
$string = strval(ob_get_contents());
ob_end_clean();
return 'data:image/png;base64,'.base64_encode($string);
}
$res = imagepng($imageRes, RUNTIME_PATH.'/'. $filename,90); //保存到本地
imagedestroy($imageRes);
if(!$res) return false;
return $filename;
}else{
ob_start();
imagepng($imageRes);//在浏览器上显示
$string = strval(ob_get_contents());
ob_end_clean();
return $string;
}
}
/**
* 生成圆形
* @param $image 图片地址
* @param null $radius 半径
* @return false|\GdImage|resource
*/ public static function imageRadius($image, $radius = null){
/**
* 处理圆形图
* @param $image 图片地址
* @return string
*/ $logo = imagecreatefromstring(file_get_contents($image));//源图象连接资源。
$height = $width = min(imagesx($logo), imagesy($logo));
if ($radius && $width / 2 < $radius){
$new_w = $new_h = $radius * 2;
$new = imagecreatetruecolor($new_w, $new_h);
imagecopyresized($new, $logo,0, 0,0, 0, $new_w, $new_h, $width, $height);
$width = $height = $new_w;
$logo = $new;
}
//创建一个和二维码图片一样大小的真彩色画布
$canvas = imagecreatetruecolor($width, $height);
$color = imagecolorallocatealpha($canvas, 0, 0, 0, 127);
imagesavealpha($canvas, true);
imagealphablending($canvas, false);
imagefill($canvas, 0, 0, $color);
imageColorTransparent($canvas, $color);
$r = $width / 2; //半径
for ($x = 0; $x < $width; $x++) {
for ($y = 0; $y < $height; $y++) {
$rgb_color = imagecolorat($logo, $x, $y);
if (((($x - $r) * ($x - $r) + ($y - $r) * ($y - $r) < ($r * $r)))) {
imagesetpixel($canvas, $x, $y, $rgb_color);
}
}
}
imagedestroy($logo);
/*ob_start();
imagepng($canvas);//在浏览器上显示
$string = strval(ob_get_contents());
ob_end_clean();
file_put_contents(RUNTIME_PATH.'/avatar.png',$string);*/ return $canvas;
}
}
使用方法
$data = [
'text' => [
[
'text' => $user['nickname'],
'top' => 410,
'align' => 'center',
'font-path' =>'/home/wwwroot/public/static/SourceHanSansCN-Regular.otf'
]
],
'qrcode' => [
[
'text' => $redirect,
'margin' => 0,
'left' => 180,
'top' => 500,
'size' => 430,
'callback' => function ($config) {
$qrcode = new QrCode($item['text']);
$qrcode->setForegroundColor($item['color']);
$qrcode->setSize($item['size']);
$qrcode->setMargin($item['margin']);
return $qrcode->writeString();
}
]
],
'background' => '/home/wwwroot/public/share_poster'
];
// 二进制流
return PosterService::create($data);
// 返回base64
return PosterService::create($data,'base64'); 
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