用PHP的GD库函数制作优惠券

<?php
class WaterImage  extends Think {//类定义开始
private   $font='./Public/fonts/msyh.ttf';
private   $font_alpha='80';
private   $title_option=array('literal'=>'默认标题水印文字','color'=>'#000000','pos_x'=>100,'pos_y'=>200,'size'=>14,'alpha'=>0,'font'=>'./Public/fonts/msyhbd.ttf');//默认title水印文字配置
private   $content_option=array('literal'=>'默认正文水印文字','color'=>'#000000','pos_x'=>150,'pos_y'=>200,'size'=>12,'alpha'=>0,'font'=>'./Public/fonts/msyh.ttf');//默认title水印文字配置
private   $img_option=array('pos_x'=>10,'pos_y'=>10, 'alpha'=>50);//默认水印图片配置
private   $image='';//中间图
private   $sourceImage='';//原图
private   $sInfo='';//原图信息
private   $waterImg='';//水印图片
private   $contentLimt=25; //单行文字长度
private   $contentMax=100; //正文最大文字长度
private   $percent=1; //水印缩略比例大小
private   $dateFormat = 'Ymd';
/**
* 创建图片
*/
public function createImg($image){
$info = $this->getImageInfo($image);
//建立图像
$createFun = "imagecreatefrom".$info['type'];
$image = $createFun($image);
return $image ;
}
/**
* 设置水印背景图片
* Enter description here ...
* @param $sourceImage
*/
public function setSourceImage($sourceImage){
$this->sourceImage = $sourceImage;
}
/**
*
* 总的调用方式
* @param $data
*/
public function addWaterMark($sourceImage,$savename='',$imgOpt=array(),$literayOpt=array()){
if (!file_exists($sourceImage)) throw_exception('源图片不存在，不能添加水印！');
$this->setSourceImage($sourceImage);
$this->sInfo = $this->getImageInfo($this->sourceImage);
$this->image = $this->createImg($this->sourceImage);
//添加图片水印
if (!empty($imgOpt)){
if (isset($imgOpt['waterImg'])){
$this->waterImg=$imgOpt['waterImg'];
$waterImgOption=array_merge($this->img_option,$imgOpt['waterOpt']);//后面参数优先级高
$this->addWaterImg($waterImgOption);//添加图片水印
}else{
foreach ($imgOpt as $parameter){
$this->waterImg=$parameter['waterImg'];
$waterImgOption=array_merge($this->img_option,$parameter['waterOpt']);
$this->addWaterImg($waterImgOption);//添加图片水印
}
}

}
//添加文字水印
if (!empty($literayOpt)){
if (isset($literayOpt['titileOpt'])||isset($literayOpt['contentOpt'])) $this->addTitileContent($literayOpt);
else{
foreach ($literayOpt as $parameter){
$this->addTitileContent($parameter);
}
}
}
if ($savename!='') {//使用自定义的图片路径和文件名
$this->saveImg($savename);
}
else {
$attachdir='./Public/Attachment/';
$savename=$this->getSaveName();
$this->saveImg($attachdir.$savename);
}
return $savename;
}

/**
+----------------------------------------------------------
* 为图片添加图片水印
+----------------------------------------------------------
+----------------------------------------------------------
* @param string $source 原文件名
* @param mixed $water  水印图片array('img'=>'./1.jpg','pos_x'=>10,'pos_y'=>10, 'alpha'=>80)
+----------------------------------------------------------
* @return mix
+----------------------------------------------------------
* @throws ThinkExecption
+----------------------------------------------------------
*/
public function addWaterImg($data) {
//检查文件是否存在
if (!file_exists($this->waterImg))
throw_exception('水印图片不存在！');
//图片信息
$wInfo = $this->getImageInfo($this->waterImg);

//建立图像
$wImage = $this->createImg($this->waterImg);

//设定图像的混色模式
imagealphablending($wImage, true);

//#图像位置,默认为右下角右对齐,以后调整
$posY = $data['pos_y'];
$posX =$data['pos_x'];

//对水印图片缩略
if (!isset($data['newwidth'])&&!isset($data['newheight'])){//长宽都没设置，则按百分比
$data['newwidth'] = $wInfo["width"] * $this->percent;
$data['newheight'] = $wInfo['height']* $this->percent;
}elseif (!isset($data['newwidth'])){//没设置宽，则按长为准
$this->percent=$wInfo["width"] / $wInfo['height'];//宽长比
$data['newwidth'] =  round($data['newheight'] * $this->percent,2);

}elseif (!isset($data['newheight'])) {//没设置长，则按宽为准
$this->percent=$wInfo['height']/$wInfo["width"];//宽长比
$data['newheight'] = round($data['newwidth'] * $this->percent,2);
}
$thumb = imagecreatetruecolor( $data['newwidth'], $data['newheight']);
$wImage = $this->createImg($this->waterImg);
// Resize
imagecopyresized($thumb, $wImage, 0, 0, 0, 0,  $data['newwidth'], $data['newheight'], $wInfo["width"],$wInfo['height']);
//生成混合图像，这是生成图片水印最关键的
imagecopymerge($this->image, $thumb, $posX, $posY, 0, 0,  $data['newwidth'], $data['newheight'], $data['alpha']);
imagedestroy($thumb);
return $this->image;
}
/**
* 分别给文字标题和内容加水印
*  @param $data
array(
'titileOpt'=>array('literal'=>'默认水印文字'),
'contentOpt'=>array(...)
)
*/
public function addTitileContent($data){
if (empty($data)) return ;
if (isset($data['titileOpt'])){
$titileOpt=array_merge($this->title_option,$data['titileOpt']);
$this->addWaterText($titileOpt);
}
if (isset($data['contentOpt'])){
$contentOpt=array_merge($this->content_option,$data['contentOpt']);
$literalen=mb_strlen(trim($contentOpt['literal']),'utf-8');//获取文字长度
if ($literalen>$this->contentLimt){//文字水印超过了单行限制
if ($literalen>$this->contentMax) throw_exception('正文内容超过了最大文字长度限制：'.$this->contentMax);
$literal=$this->phaseContent(trim($contentOpt['literal']));

foreach ($literal as $i=>$tring){
$contentOpt['literal']=$tring;
if ($i==0)     $this->addWaterText($contentOpt);
else{
$contentOpt['pos_y']+=20;
$this->addWaterText($contentOpt);
}
}
}else $this->addWaterText($contentOpt);
}

}
/**
*
* 分割字符串为数组
* @param unknown_type $string
*/
public function phaseContent($string){
import("ORG.Util.String");
$data=array();
$string_arr=explode("\n", $string);//必须用双引号
foreach ($string_arr as $value){
$lenth=mb_strlen(trim($value),'utf-8');
if($lenth>$this->contentLimt){
for ($i=0;$i<$lenth;$i+=$this->contentLimt){
$temp=String::msubstr(trim($value), $i, $this->contentLimt,'utf-8',false);
array_push($data, $temp);
}
continue;
}
array_push($data, $value);
}
if (count($data)>4) array_splice($data, 4);
return $data;
}
/**
*
*给图片添加文字
*文字水印
*@param array $data array(array('literal'=>'literal','color'=>'mixed','pos_x'=>10,'pos_y'=>10,'size'=>14,'alpha'=>80,'font'=>'mysh.ttf'))
*/
function addWaterText($data){
$c = $this->_parseColor($data['color']);
$data['color'] = imagecolorallocatealpha($this->image, $c[0], $c[1], $c[2], $data['alpha']);
imagettftext($this->image,$data['size'], 0, $data['pos_x'], $data['pos_y'], $data['color'], $data['font'],$data['literal']);
return $this->image;
}
/**
*
* @param unknown_type $sourceImage 源图像路径
* @param unknown_type $sImage    通过函数产生的图像
* @param $savename 存储路径
*/
function saveImg($savename){
//输出图像
$ImageFun = 'Image' . $this->sInfo['type'];
//如果没有给出保存文件名，默认为原图像名
if (!$savename) {
$savename = $this->sourceImage;
@unlink($this->sourceImage);
}
//保存图像
$ImageFun($this->image, $savename);
imagedestroy($this->image);
}
/**
+----------------------------------------------------------
* 取得图像信息
*
+----------------------------------------------------------
* @static
* @access public
+----------------------------------------------------------
* @param string $image 图像文件名
+----------------------------------------------------------
* @return mixed
+----------------------------------------------------------
*/
function getImageInfo($img) {
$imageInfo = getimagesize($img);
if ($imageInfo !== false) {
$imageType = strtolower(substr(image_type_to_extension($imageInfo[2]), 1));
$imageSize = filesize($img);
$info = array(
"width" => $imageInfo[0],
"height" => $imageInfo[1],
"type" => $imageType,
"size" => $imageSize,
"mime" => $imageInfo['mime']
);
return $info;
} else {
return false;
}
}

/**
* 分析颜色
*
* @param    string     $color    十六进制颜色
*/
private function _parseColor($color)
{
$arr = array();
for($ii=1; $ii<strlen($color); $ii++)
{
$arr[] = hexdec(substr($color,$ii,2));
$ii++;
}

Return $arr;
}
private   function getSaveName() {
$md5=md5(mktime().rand());
$name=substr($md5, 0,13);
$saveName=$name.'.'.$this->sInfo['type'];
$saveName = $this->getDirName().'/'.$saveName;
return $saveName;
}
/**
+----------------------------------------------------------
* 获取子目录的名称
*/
private function getDirName() {
$attachdir='./Public/Attachment/';
$dir   =  date($this->dateFormat,time());
if(!is_dir($attachdir.$dir)) {
mk_dir($attachdir.$dir);
}
return $dir;
}
}

$water=APP_PATH .'/Public/images/homelogo.jpg';    //水印图
$active='./Public/Attachment/'.$_POST['activeimg'];
if (!file_exists($active)) throw_exception('商家上传图片不存在，不能添加水印！');
$watermark=new WaterImage();
$timest = strtotime("+".$_POST['validaynum']." days",time());  // 30天后的时间戳
$date=date("Y-m-d",$timest);   // 格式化日期
//设置具体图片参数
$imgOpt[]=array('waterImg'=>$water,'waterOpt'=>array('pos_x'=>0,'pos_y'=>0, 'alpha'=>80));//添加logo
$imgOpt[]=array('waterImg'=>$active,'waterOpt'=>array('pos_x'=>120,'pos_y'=>160, 'alpha'=>80,'newwidth'=>280,'newheight'=>170));//添加中间的活动图片
$literayOpt=array(//文字水印参数，可以为一维数组，可选
array(
'titileOpt'=>array('literal'=>'详       情:','pos_x'=>40,'pos_y'=>380,'size'=>12),
'contentOpt'=>array('literal'=>$_POST['Details'],'pos_x'=>120,'pos_y'=>380,'size'=>10)
),
array(
'titileOpt'=>array('literal'=>'店       名:','pos_x'=>40,'pos_y'=>455,'size'=>12),
'contentOpt'=>array('literal'=>$refectoryInfo['refectory_name'],'pos_x'=>120,'pos_y'=>455,'size'=>10)
),
array(
'titileOpt'=>array('literal'=>'地       址:','pos_x'=>40,'pos_y'=>480,'size'=>12),
'contentOpt'=>array('literal'=>$refectoryInfo['refectory_address'],'pos_x'=>120,'pos_y'=>480,'size'=>10)
),
array(
'titileOpt'=>array('literal'=>'电       话:','pos_x'=>40,'pos_y'=>505,'size'=>12),
'contentOpt'=>array('literal'=>$refectoryInfo['bespeak_meal'],'pos_x'=>120,'pos_y'=>505,'size'=>10)
),
array(
'titileOpt'=>array('literal'=>'有效期至:','pos_x'=>40,'pos_y'=>530,'size'=>12),
'contentOpt'=>array('literal'=>$date,'pos_x'=>120,'pos_y'=>530,'size'=>10)
)
);
if ($_POST['type_coupon']==2){
$literayOpt[]=array(
'contentOpt'=>array('literal'=>$_POST['discount'].' 折优惠','pos_x'=>150,'pos_y'=>120,'size'=>40,'color'=>'#CB1B0D','font'=>'./Public/fonts/STXINGKA.TTF')
);
}
if ($_POST['type_coupon']==1){
$literayOpt[]=array(
'contentOpt'=>array('literal'=>'立减 '.$_POST['discount'].'元','pos_x'=>150,'pos_y'=>120,'size'=>40,'color'=>'#CB1B0D','font'=>'./Public/fonts/STXINGKA.TTF')
);
}
//添加水印
$watername =$watermark->addWaterMark($imgTemplate,'',$imgOpt,$literayOpt);