分享php多功能图片处理类，
本文实例为大家分享了多功能php图片处理类，供大家参考，具体内容如下
<?php
/**
* Image.class.php 图像处理类
* @author Administrator
*
*/
class Image{
private $path='';
/**
* 构造方法
* @param unknown $path
*/
function __construct($path=''){
if (!empty($path)) {
$this->path=$path;
}
}
/**
+-----------------------------------------------
* 等比缩放函数
+-----------------------------------------------
* @param unknown $name 需处理图片的名称
* @param unknown $width 缩放后的宽度
* @param unknown $height 缩放后的高度
* @param string $thumb_prixs 缩放后的前缀名
* @return mixed $newname 返回的缩放后的文件名
*/
function thumb($name,$width,$height,$thumb_prixs='th_'){
//获取图片信息
$Info=$this->ImageInfo($name); //图片的宽度，高度，类型
//获取图片资源，各种类型的图片都可以创建资源，jpg,gif,png
$imagres=$this->Img_resouce($name, $Info);
//获取计算图片等比例之后的大小，
$size=$this->getNewSize($name,$width,$height,$Info);
//获取新的图片资源，处理透明背景
$newimg=$this->getImage($imagres,$size,$Info);
//另存为一个新的图片，返回新的缩放后的图片名称
$newname=$this->SaveNewImage($newimg,$thumb_prixs.$name,$Info);
return $newname;
}
/**
+-----------------------------------------------------------------------
* 水印标记函数
+-----------------------------------------------------------------------
* @param unknown $backname 背景文件名
* @param unknown $watername 水印文件名
* @param number $waterpos 水印位置
* @param string $wa_prixs 水印前缀名
* @return boolean
*/
function waterMark($backname,$watername,$waterpos=0,$wa_prixs='wa_') {
if (file_exists($this->path.$backname) && file_exists($this->path.$watername)) {
$backinfo=$this->ImageInfo($backname);
$waterinfo=$this->ImageInfo($watername);
if(!$pos=$this->getPos($backinfo, $waterinfo, $waterpos)){
echo "水印图片不应该比背景图片小";
return false;
}
$backimg=$this->Img_resouce($backname, $backinfo);
$waterimg=$this->Img_resouce($watername, $waterinfo);
var_dump($backimg);exit();
$backimg=$this->CopyImage($backimg, $waterimg, $pos, $waterinfo);
$this->SaveNewImage($backimg, $wa_prixs.$backname, $backinfo);
}else{
echo "图片或水印不存在";
return false;
}
}
/**
+-----------------------------------------------------------------------
* 获取图片信息函数
+-----------------------------------------------------------------------
* @param unknown $name
* @return unknown
*/
private function ImageInfo($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;
}
}
/**
+--------------------------------------------------------
* 创建原图像格式函数
+--------------------------------------------------------
* @param unknown $name
* @param unknown $imaginfo
* @return boolean|resource
*/
private function Img_resouce($name,$imageinfo){
$iamgeres=$this->path.$name;
//var_dump($iamgeres);exit();
switch ($imageinfo['type']) {
case 'gif':
$img=imagecreatefromgif($name);
break;
case 'jpg':
$img=imagecreatefromjpeg($name);
break;
case 'png':
$img=imagecreatefrompng($name);
break;
}
return $img;
}
/**
+--------------------------------------------------
* 获取等比缩放尺寸函数
+--------------------------------------------------
* @param unknown $name
* @param unknown $width
* @param unknown $height
* @param unknown $imaginfo
* @return Ambigous
*/
private function getNewSize($name,$width,$height,$imaginfo){
$size['width']=$imaginfo['width'];
$size['height']=$imaginfo['height'];
if ($width<$imaginfo['width']) {
$size['width']=$width;
}
if ($height<$imaginfo['height']) {
$size['height']=$height;
}
//图像等比例缩放算法
if ($imaginfo['width']*$size['width']>$imaginfo['height']*$size['height']) {
$size['height']=round($imaginfo['height']*$size['width']/$imaginfo['width']);
}else{
$size['width']=round($imaginfo['width']*$size['height']/$imaginfo['height']);
}
return $size;
}
private function getImage($imageres,$size,$imageinfo){
//新建一个真彩色图像
$newimg=imagecreatetruecolor($size['width'], $size['height']);
//将某个颜色定义为透明色
$otsc=imagecolortransparent($imageres);
//获取图像的调色板的颜色数目
if ($otsc>=0&&$otsc<=imagecolorstotal($imageres)) {
//取得某索引的颜色
$stran=imagecolorsforindex($imageres, $otsc);
//为图像分配颜色
$newt=imagecolorallocate($imageres, $stran['red'], $stran['green'], $stran['blue']);
//区域填充函数
imagefill($newimg, 0, 0, $newt);
//为图像定义透明色
imagecolortransparent($newimg,$newt);
}
imagecopyresized($newimg, $imageres, 0, 0, 0, 0, $size['width'], $size['height'], $imageinfo['width'], $imageinfo['height']);
imagedestroy($imageres);
return $newimg;
}
/**
+----------------------------------------------
*保存图像函数
+----------------------------------------------
* @param unknown $newimg
* @param unknown $newname
* @param unknown $imageinfo
* @return unknown
*/
private function SaveNewImage($newimg,$newname,$imageinfo){
switch ($imageinfo['type']){
case 1://gif
$result=imagegif($newimg,$this->path.$newname);
break;
case 2://jpg
$result=imagejpeg($newimg,$this->path.$newname);
break;
case 3://png
$result=imagepng($newimg,$this->path.$newname);
break;
}
imagedestroy($newimg);
return $newname;
}
/**
+-----------------------------------------------------------------
* 获取水印位置函数
+-----------------------------------------------------------------
* @param unknown $backinfo 背景信息
* @param unknown $waterinfo 水印信息
* @param unknown $waterpos 水印位置
* @return boolean|multitype:number 返回坐标数组
*/
private function getPos($backinfo,$waterinfo,$waterpos) {
if ($backinfo['width']<$waterinfo['width']||$backinfo['height']<$waterinfo['height']) {
return false;
}
switch ($waterpos) {
case 1://左上角
$posX=0;
$posY=0;
break;
case 2://中上方
$posX=$backinfo['width']-$waterinfo['width']/2;
$posY=0;
break;
case 3://右上角
$posX=$backinfo['width']-$waterinfo['width'];
$posY=0;
break;
case 4://左中方
$posX=0;
$posY=$backinfo['height']-$waterinfo['height']/2;
break;
case 5://正中间
$posX=$backinfo['width']-$waterinfo['width']/2;
$posY=$backinfo['height']-$waterinfo['height']/2;
break;
case 6://右中方
$posX=$backinfo['width']-$waterinfo['width'];
$posY=$backinfo['height']-$waterinfo['height']/2;
break;
case 7://底部靠左
$posX=0;
$posY=$backinfo['height']-$waterinfo['height'];
break;
case 8://底部居中
$posX=$backinfo['width']-$waterinfo['width']/2;
$posY=$backinfo['height']-$waterinfo['height'];
break;
case 9://底部靠右
$posX=$backinfo['width']-$waterinfo['width'];
$posY=$backinfo['height']-$waterinfo['height'];
break;
case 0:
default :
$posX=rand(0,$backinfo['width']-$waterinfo['width']);
$posY=rand(0,$backinfo['height']-$waterinfo['height']);
break;
}
return array('posX'=>$posX,'posY'=>$posY);
}
/**
+-------------------------------------------------------------------
* 拷贝图像
+-------------------------------------------------------------------
* @param unknown $backimg 背景资源
* @param unknown $waterimg 水印资源
* @param unknown $pos 水印位置
* @param unknown $waterinfo 水印信息
* @return unknown
*/
private function CopyImage($backimg,$waterimg,$pos,$waterinfo) {
imagecopy($backimg, $waterimg, $pos['posX'], $pos['posY'], 0, 0, $waterinfo['width'], $waterinfo['height']);
imagedestroy($waterimg);
return $backimg;
}
}
?>
以上就是本文的全部内容，希望对大家学习PHP程序设计有所帮助。
