<?php
// header("Content-type:text/html;charset=utf-8");
/**
* GD库类
* 功能：水印 缩略图 验证码
*/
class ImageTool{
protected static $erroTxt;
/**
* getImgInfo
* 获取图片信息
* param filename
* return Array/False
*/
protected static function getImgInfo($filename){
if (!file_exists($filename)) {
# code...
ImageTool::$erroTxt = $filename.'图片不存在';
return false;
}
$imgInfo = getimagesize($filename);
if(!$imgInfo){
ImageTool::$erroTxt = $filename.'未知图片类型';
return false;
}
$info['width'] = $imgInfo[0];
$info['height'] = $imgInfo[1];
$info['ext'] = strtolower( str_replace('/', '', strrchr($imgInfo['mime'],'/')) );
return $info;
}
/**
* water()
* 功能：图片加水印
* param : $dst_img 目标图片
* $water_img 水印图片
* $save 目标函数保存路径
* $pos 水印位置 上右下左 0 1 2 3 默认为2右下角
* $alpha透明度
* return
*/
public static function water($dst_img,$water_img,$save='',$pos='2',$alpha='50'){
$dst_info = ImageTool::getImgInfo($dst_img);
$water_info = ImageTool::getImgInfo($water_img);
if(!$dst_info || !$water_info){
return false;
}
//判断水印图片是否大于目标图片
if ($dst_info['width']<=$water_info['width'] || $dst_info['height']<=$water_info['height']) {
# code...
ImageTool::$erroTxt='水印图片大于待操作图片';
return false;
}
//生产对应画布函数
$createDstFun = 'imagecreatefrom'.$dst_info['ext'];
$createWaterFun = 'imagecreatefrom'.$water_info['ext'];
// return $createWaterFun;
if (!function_exists($createDstFun)) {
# code...
ImageTool::$erroTxt=$createDstFun.'函数异常';
return false;
}
if (!function_exists($createWaterFun)) {
# code...
ImageTool::$erroTxt=$createWaterFun.'函数异常';
return false;
}
//创建画布
// ob_clean();
$dst_im = $createDstFun($dst_img);
$water_im = $createWaterFun($water_img);
//画布函数操作
$src_x = 0;
$src_y = 0;
$src_w = $water_info['width'];
$src_h = $water_info['height'];
switch ($pos) {
case '0':
# code...左上角
$dst_x = 0;
$dst_y = 0;
break;
case '1':
# code...右上角
$dst_x = $dst_info['width']-$water_info['width'];
$dst_y = 0;
break;
case '3':
# code...左下角
$dst_x = 0;
$dst_y = $dst_info['height']-$water_info['height'];
break;
default:
# code...右下角
$dst_x = $dst_info['width']-$water_info['width'];
$dst_y = $dst_info['height']-$water_info['height'];
break;
}
// return $pos;
$rs = imagecopymerge ( $dst_im , $water_im , $dst_x , $dst_y , $src_x , $src_y , $src_w , $src_h , $alpha );
if( !$rs ){
ImageTool::$erroTxt='水印添加失败';
return false;
}
$imgInputFun='image'.$dst_info['ext'];
if(!$save){
$save = $dst_img;
unlink($dst_img);
}
$imgInputFun($dst_im,$save);
imagedestroy($dst_im);
imagedestroy($water_im);
return true;
}
/**
* thumb()
* 缩略图
* param :
* $src_img 原图片路径
* $thumb_w,$thumb_h 缩略图宽高
* $save 缩略图保存路径
*/
public static function thumb($src_img,$thumb_w='200',$thumb_h='200',$save=''){
$thumbInfo = ImageTool::getImgInfo($src_img);
if(!$thumbInfo){
return false;
}
//创建画布
$dst_im = imagecreatetruecolor($thumb_w,$thumb_h);
//缩略图函数
$thumbFun = 'imagecreatefrom'.$thumbInfo['ext'];
$thumb_im = $thumbFun($src_img);
//缩略图比例
$percent = min( $thumb_w/$thumbInfo['width'],$thumb_h/$thumbInfo['height'] ); //小数
$bg = imagecolorallocate($dst_im, 255, 255, 255);
imagefill($dst_im, 0, 0, $bg); //填充背景为白色
$dst_image = $dst_im;
$src_image = $thumb_im;
$src_x = 0;
$src_y = 0;
$dst_w = $thumbInfo['width']*$percent; //图片粘贴到缩略图的宽
$dst_h = $thumbInfo['height']*$percent; //图片粘贴到缩略图的高
$src_w = $thumbInfo['width'];
$src_h = $thumbInfo['height'];
$dst_x = ($thumb_w - $dst_w)/2;
$dst_y = ($thumb_w - $dst_h)/2;
$rs = imagecopyresampled($dst_image, $src_image, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h);
if(!$rs){
ImageTool::$erroTxt='生成缩略图失败';
return false;
}
$imgInputFun='image'.$thumbInfo['ext'];
if(!$save){
// $path = str_replace('D:/WWW/study/food/', '../', dirname($src_img)).'/thumb_'.basename($src_img);
$path = dirname($src_img).'/thumb_'.basename($src_img);
}else{
// $path = str_replace('D:/WWW/study/food/', '../', dirname($src_img)).'/'.$save.'_'.basename($src_img);
$path = dirname($src_img).'/'.$save.'_'.basename($src_img);
}
$save = $path;
$imgInputFun($dst_im,$save);
imagedestroy($dst_im);
return $path;
}
/**
* captcha
* 生成验证码
* param : $width 验证码宽 $heigth 验证码高
* $lineNum 线条干扰码数目
* $alpha 线条干扰码透明度
* $length 验证码字符长度
* return String
*/
public static function captchat($width='70',$height='25',$lineNum='10',$length='4',$alpha='80'){
$capt_im = imagecreatetruecolor($width, $height);
$bak_im = imagecreatetruecolor($width, $height);
$bg = imagecolorallocate($capt_im, 100, 100, 100);
$color = imagecolorallocate($capt_im, rand(0,255), rand(0,255), rand(0,255));
imagefill($capt_im, 0, 0, $bg);
imagefill($bak_im, 0, 0, $bg);
//干扰线
for($i=0;$i<$lineNum;$i++){
$lincolor = imagecolorallocatealpha($capt_im, rand(0,255), rand(0,255), rand(0,255),$alpha);
imageline($capt_im, rand(0,$width), rand(0,$height), rand(0,$width), rand(0,$height), $lincolor);
}
//干扰点
for($i=0;$i<200;$i++){
$dotcolor = imagecolorallocatealpha($capt_im, rand(0,255), rand(0,255), rand(0,255),$alpha);
imagesetpixel($capt_im,rand(0,$width), rand(0,$height), $dotcolor);
}
$size =18;
$angle = 0;
$x = 2;
$y = 22;
$fontfile = 'verdana.ttf';
$text = ImageTool::randName($length);
imagettftext($capt_im, $size, $angle, $x, $y, $color, $fontfile, $text);
// 验证码扭曲
$range = 4; //扭曲程度
// imagecopyresampled($dst_image, $src_image, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h)
for($i=0;$i<$width;$i++){
$y = sin(deg2rad( (720/$width)*$i )) * $range;
imagecopyresampled($bak_im, $capt_im, $i, $y, $i, 0, $i, $height, $i, $height);
}
header("Content-type:image/png");
imagepng($bak_im);
imagedestroy($capt_im);
imagedestroy($bak_im);
return true;
}
/**
* 生成随机字符
* arg $n
* return string
*/
protected static function randName($n=6){ //$n 代表截取长度
$str = 'abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ0123456789';
$str = str_shuffle($str); //随机打乱一个字符串
$str = substr($str,0,$n); //截取子字符串
return $str;
}
/**
* getError()
* 获取错误信息
* param String
* return String
*/
public static function getError(){
return ImageTool::$erroTxt;
}
}
// ImageTool::captchat();
?>
