127 lines
3.9 KiB
PHP
127 lines
3.9 KiB
PHP
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<?php
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namespace app\service;
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use think\Exception;
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/**
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* GD2库绘画
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* Class GdTool
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* @package app\service
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*/
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class GdTool
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{
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/**
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* 生成海报
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* 背景尺寸固定： 750 * 1334
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*
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* @param string $srcQr 生成的二维码base64值
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* @param string $bgImg 背景图片 自定义背景图
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* @param string $savePath 海报保存路径，为空则返回base64值
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* @return bool|string
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* @throws \Exception
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*/
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public static function generatePoster(string $srcQr='', string $bgImg = '', string $savePath = '')
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{
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try {
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if (!empty($savePath)) {
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if (!is_dir($savePath)) {
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@mkdir($savePath, 0777, true);
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}
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if (!is_dir($savePath) || !is_writeable($savePath)) {
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throw new \Exception('无法保存');
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}
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}
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//1、创建画布资源
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// 背景尺寸： 750 * 1334
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$defBga = app()->getRootPath().'public/static/images/poster-bg1.png';
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$srcBga = empty($bgImg) ? $defBga : $bgImg;
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$bgInfo = @getimagesize($srcBga);
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if ($bgInfo[0] != 750 || $bgInfo[1] != 1334) {
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throw new \Exception('海报模板尺寸不正确！');
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}
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if (!$bgInfo) {
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throw new \Exception('海报背景图资源不存在！');
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}
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$ext = $bgInfo['mime'];
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$img = null;
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switch ($ext) {
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case 'image/jpeg':
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$img = @imagecreatefromjpeg($srcBga);
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break;
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case 'image/png':
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$img = @imagecreatefrompng($srcBga);
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break;
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}
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if (!$img) {
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throw new \Exception('无效背景图');
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}
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//2、准备颜色
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$black = imagecolorallocate($img,0,0,0);
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$while = imagecolorallocate($img,255,255,255);
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$faColor = imagecolorallocate($img,0,104,51);
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//填充画布（背景色）
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imagefill($img,0,0, $while);
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// 组合二维码图片 ，坐标：x:246; y:959
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$prefixPng = 'data:image/png;base64,';
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$qrStr = base64_decode(str_replace($prefixPng,"",$srcQr));
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$qrImg = @imagecreatefromstring($qrStr);
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list($qrWidth, $qrHeight) = getimagesize($srcQr);
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if(!$qrImg) {
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imagedestroy($img);
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throw new \Exception('无效二维码');
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}
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$imgQrW = $imgQrH = 274;
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imagecopyresampled($img, $qrImg, 456, 959, 0, 0, $imgQrW, $imgQrH, $qrWidth, $qrHeight);
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imagedestroy($qrImg);
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//4、输出与保存最终图像(保存文件或返回base64)
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if (empty($savePath)) {
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/* 返回base64 */
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ob_start();
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if ($ext == 'image/jpeg') {
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imagejpeg($img);
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} else {
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imagepng($img);
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}
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$imgData = ob_get_contents();
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ob_end_clean();
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imagedestroy($img);
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$prefix = 'data:image/jpg/png/gif;base64,';
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return $prefix.base64_encode($imgData);
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} else {
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/* 保存到文件*/
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$fileName = md5(microtime(true)).'.'.$ext;
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$saveFile = $savePath."/".$fileName;
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if ($ext == 'image/jpeg') {
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imagejpeg($img, $saveFile);
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} else {
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imagepng($img, $saveFile);
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}
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}
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/*
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* 输出显示
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header("content-type: image/png");
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imagepng($img);
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*/
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//5、释放画布资源
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imagedestroy($img);
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} catch (\Exception $e) {
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throw $e;
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}
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return true;
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}
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}
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