本文实例讲述了PHP实现的通用图片处理类。分享给大家供大家参考。具体如下：
该图片处理函数功能：缩放、剪切、相框、水印、锐化、旋转、翻转、透明度、反色，处理并保存历史记录的思路：当有图片有改动时自动生成一张新图片，命名方式可以考虑在原图片的基础上加上步骤，例如：图片名称+__第几步。 在一些需要图片高级处理功能的Web应用中，可以参考这个类。
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'没有找到相关图片!'
);
/*
构造函数：函数初始化
*/
function __construct($PICTURE_URL)
{
$this->get_info($PICTURE_URL);
}
function get_info($PICTURE_URL)
{
/*
处理原图片的信息,先检测图片是否存在,不存在则给出相应的信息
*/
@$SIZE=getimagesize($PICTURE_URL);
if(!$SIZE)
{
exit($this->ERROR['unalviable']);
}
//得到原图片的信息类型、宽度、高度
$this->PICTURE_MIME=$SIZE['mime'];
$this->PICTURE_;
$this->PICTURE_HEIGHT=$SIZE[1];
//创建图片
switch($SIZE[2])
{
case 1:
$this->PICTURE_CREATE=imagecreatefromgif($PICTURE_URL);
$this->PICTURE_TYPE="imagejpeg";
$this->PICTURE_EXT="jpg";
break;
case 2:
$this->PICTURE_CREATE=imagecreatefromjpeg($PICTURE_URL);
$this->PICTURE_TYPE="imagegif";
$this->PICTURE_EXT="gif";
break;
case 3:
$this->PICTURE_CREATE=imagecreatefrompng($PICTURE_URL);
$this->PICTURE_TYPE="imagepng";
$this->PICTURE_EXT="png";
break;
}
/*
文字颜色转换16进制转换成10进制
*/
preg_match_all("/([0-f]){2,2}/i",$this->FONT_COLOR,$MATCHES);
if(count($MATCHES)==3)
{
$this->RED=hexdec($MATCHES[0][0]);
$this->GREEN=hexdec($MATCHES[0][1]);
$this->BLUE=hexdec($MATCHES[0][2]);
}
}
//end of __construct
/*
将16进制的颜色转换成10进制的（R，G，B）
*/
function hex2dec()
{
preg_match_all("/([0-f]){2,$MATCHES);
if(count($MATCHES)==3)
{
$this->RED=hexdec($MATCHES[0][0]);
$this->GREEN=hexdec($MATCHES[0][1]);
$this->BLUE=hexdec($MATCHES[0][2]);
}
}
//缩放类型
function zoom_type($ZOOM_TYPE)
{
$this->ZOOM=$ZOOM_TYPE;
}
//对图片进行缩放,如果不指定高度和宽度就进行缩放
function zoom()
{
//缩放的大小
if($this->ZOOM==0)
{
$this->ZOOM_;gt;PICTURE_WIDTH * $this->ZOOM_MULTIPLE;
$this->ZOOM_HEIGHT=$this->PICTURE_HEIGHT * $this->ZOOM_MULTIPLE;
}
//新建一个真彩图象
$this->TRUE_COLOR=imagecreatetruecolor($this->ZOOM_WIDTH,$this->ZOOM_HEIGHT);
$WHITE=imagecolorallocate($this->TRUE_COLOR,255,255);
imagefilledrectangle($this->TRUE_COLOR,$this->ZOOM_WIDTH,$this->ZOOM_HEIGHT,$WHITE);
imagecopyresized($this->TRUE_COLOR,$this->PICTURE_CREATE,$this->PICTURE_WIDTH,$this->PICTURE_HEIGHT);
}
//end of zoom
//裁切图片,按坐标或自动
function cut()
{
$this->TRUE_COLOR=imagecreatetruecolor($this->CUT_WIDTH,$this->CUT_WIDTH);
imagecopy($this->TRUE_COLOR,$this->CUT_X,$this->CUT_Y,$this->CUT_WIDTH,$this->CUT_HEIGHT);
}
//end of cut
/*
在图片上放文字或图片
水印文字
*/
function _mark_text()
{
$this->TRUE_COLOR=imagecreatetruecolor($this->PICTURE_WIDTH,$this->PICTURE_HEIGHT);
$this->WORD=mb_convert_encoding($this->FONT_WORD,'utf-8','gb2312');
/*
取得使用 TrueType 字体的文本的范围
*/
$TEMP = imagettfbBox($this->FONT_SIZE,$this->FONT_PATH,$this->WORD);
$WORD_LENGTH=strlen($this->WORD);
$WORD_WIDTH =$TEMP[2] - $TEMP[6];
$WORD_HEIGHT =$TEMP[3] - $TEMP[7];
/*
文字水印的默认位置为右下角
*/
if($this->WORD_X=="")
{
$this->WORD_X=$this->PICTURE_WIDTH-$WORD_WIDTH;
}
if($this->WORD_Y=="")
{
$this->WORD_Y=$this->PICTURE_HEIGHT-$WORD_HEIGHT;
}
imagesettile($this->TRUE_COLOR,$this->PICTURE_CREATE);
imagefilledrectangle($this->TRUE_COLOR,$this->PICTURE_HEIGHT,IMG_COLOR_TILED);
$TEXT2=imagecolorallocate($this->TRUE_COLOR,$this->RED,$this->GREEN,$this->Blue);
imagettftext($this->TRUE_COLOR,$this->FONT_SIZE,$this->ANGLE,$this->WORD_X,$this->WORD_Y,$TEXT2,$this->WORD);
}
/*
水印图片
*/
function _mark_picture()
{
/*
获取水印图片的信息
*/
@$SIZE=getimagesize($this->FORCE_URL);
if(!$SIZE)
{
exit($this->ERROR['unalviable']);
}
$FORCE_PICTURE_;
$FORCE_PICTURE_HEIGHT=$SIZE[1];
//创建水印图片
switch($SIZE[2])
{
case 1:
$FORCE_PICTURE_CREATE=imagecreatefromgif($this->FORCE_URL);
$FORCE_PICTURE_TYPE="gif";
break;
case 2:
$FORCE_PICTURE_CREATE=imagecreatefromjpeg($this->FORCE_URL);
$FORCE_PICTURE_TYPE="jpg";
break;
case 3:
$FORCE_PICTURE_CREATE=imagecreatefrompng($this->FORCE_URL);
$FORCE_PICTURE_TYPE="png";
break;
}
/*
判断水印图片的大小，并生成目标图片的大小，如果水印比图片大，则生成图片大小为水印图片的大小。否则生成的图片大小为原图片大小。
*/
$this->NEW_PICTURE=$this->PICTURE_CREATE;
if($FORCE_PICTURE_WIDTH>$this->PICTURE_WIDTH)
{
$CREATE_;gt;FORCE_START_X;
}
else
{
$CREATE_;gt;PICTURE_WIDTH;
}
if($FORCE_PICTURE_HEIGHT>$this->PICTURE_HEIGHT)
{
$CREATE_HEIGHT=$FORCE_PICTURE_HEIGHT-$this->FORCE_START_Y;
}
else
{
$CREATE_HEIGHT=$this->PICTURE_HEIGHT;
}
/*
创建一个画布
*/
$NEW_PICTURE_CREATE=imagecreatetruecolor($CREATE_WIDTH,$CREATE_HEIGHT);
$WHITE=imagecolorallocate($NEW_PICTURE_CREATE,255);
/*
将背景图拷贝到画布中
*/
imagecopy($NEW_PICTURE_CREATE,$this->PICTURE_HEIGHT);
/*
将目标图片拷贝到背景图片上
*/
imagecopy($NEW_PICTURE_CREATE,$FORCE_PICTURE_CREATE,$this->FORCE_X,$this->FORCE_Y,$this->FORCE_START_X,$this->FORCE_START_Y,$FORCE_PICTURE_WIDTH,$FORCE_PICTURE_HEIGHT);
$this->TRUE_COLOR=$NEW_PICTURE_CREATE;
}
//end of mark
function alpha_()
{
$this->TRUE_COLOR=imagecreatetruecolor($this->PICTURE_WIDTH,$this->PICTURE_HEIGHT);
$rgb="#CDCDCD";
$tran_color="#000000";
for($j=0;$j<=$this->PICTURE_HEIGHT-1;$j++)
{
for ($i=0;$i<=$this->PICTURE_WIDTH-1;$i++)
{
$rgb = imagecolorat($this->PICTURE_CREATE,$i,$j);
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;
$now_color=imagecolorallocate($this->PICTURE_CREATE,$r,$g,$b);
if ($now_color==$tran_color)
{
continue;
}
else
{
$color=imagecolorallocatealpha($this->PICTURE_CREATE,$b,$ALPHA);
imagesetpixel($this->PICTURE_CREATE,$ALPHA_X+$i,$ALPHA_Y+$j,$color);
}
$this->TRUE_COLOR=$this->PICTURE_CREATE;
}
}
}
/*
图片旋转:
沿y轴旋转
*/
function turn_y()
{
$this->TRUE_COLOR=imagecreatetruecolor($this->PICTURE_WIDTH,$this->PICTURE_HEIGHT);
for ($x = 0; $x < $this->PICTURE_WIDTH; $x++)
{
imagecopy($this->TRUE_COLOR,$this->PICTURE_WIDTH - $x - 1,$x,1,$this->PICTURE_HEIGHT);
}
}
/*
沿X轴旋转
*/
function turn_x()
{
$this->TRUE_COLOR=imagecreatetruecolor($this->PICTURE_WIDTH,$this->PICTURE_HEIGHT);
for ($y = 0; $y < $this->PICTURE_HEIGHT; $y++)
{
imagecopy($this->TRUE_COLOR,$this->PICTURE_HEIGHT - $y - 1,$y,1);
}
}
/*
任意角度旋转
*/
function turn()
{
$this->TRUE_COLOR=imagecreatetruecolor($this->PICTURE_WIDTH,$this->PICTURE_HEIGHT);
imageCopyResized($this->TRUE_COLOR,$this->PICTURE_HEIGHT);
$WHITE=imagecolorallocate($this->TRUE_COLOR,255);
$this->TRUE_COLOR=imagerotate ($this->TRUE_COLOR,$this->CIRCUMROTATE,$WHITE);
}
/*
图片锐化
*/
function sharp()
{
$this->TRUE_COLOR=imagecreatetruecolor($this->PICTURE_WIDTH,$this->PICTURE_HEIGHT);
$cnt=0;
for ($x=0; $x<$this->PICTURE_WIDTH; $x++)
{
for ($y=0; $y<$this->PICTURE_HEIGHT; $y++)
{
$src_clr1 = imagecolorsforindex($this->TRUE_COLOR,imagecolorat($this->PICTURE_CREATE,$x-1,$y-1));
$src_clr2 = imagecolorsforindex($this->TRUE_COLOR,$y));
$r = intval($src_clr2["red"]+$this->SHARP*($src_clr2["red"]-$src_clr1["red"]));
$g = intval($src_clr2["green"]+$this->SHARP*($src_clr2["green"]-$src_clr1["green"]));
$b = intval($src_clr2["blue"]+$this->SHARP*($src_clr2["blue"]-$src_clr1["blue"]));
$r = min(255,max($r,0));
$g = min(255,max($g,0));
$b = min(255,max($b,0));
if (($DST_CLR=imagecolorexact($this->PICTURE_CREATE,$b))==-1)
$DST_CLR = imagecolorallocate($this->PICTURE_CREATE,$b);
$cnt++;
if ($DST_CLR==-1) die("color allocate faile at $x,$y ($cnt).");
imagesetpixel($this->TRUE_COLOR,$DST_CLR);
}
}
}
/*
将图片反色处理??
*/
function return_color()
{
/*
创建一个画布
*/
$NEW_PICTURE_CREATE=imagecreate($this->PICTURE_WIDTH,$this->PICTURE_HEIGHT);
$WHITE=imagecolorallocate($NEW_PICTURE_CREATE,$this->PICTURE_HEIGHT);
$this->TRUE_COLOR=$NEW_PICTURE_CREATE;
}
/*
生成目标图片并显示
*/
function show()
{
// 判断浏览器,若是IE就不发送头
if(isset($_SERVER['HTTP_USER_AGENT']))
{
$ua = strtoupper($_SERVER['HTTP_USER_AGENT']);
if(!preg_match('/^.*MSIE.*\)$/i',$ua))
{
header("Content-type:$this->PICTURE_MIME");
}
}
$OUT=$this->PICTURE_TYPE;
$OUT($this->TRUE_COLOR);
}
/*
生成目标图片并保存
*/
function save_picture()
{
// 以 JPEG 格式将图像输出到浏览器或文件
$OUT=$this->PICTURE_TYPE;
if(function_exists($OUT))
{
// 判断浏览器,若是IE就不发送头
if(isset($_SERVER['HTTP_USER_AGENT']))
{
$ua = strtoupper($_SERVER['HTTP_USER_AGENT']);
if(!preg_match('/^.*MSIE.*\)$/i',$ua))
{
header("Content-type:$this->PICTURE_MIME");
}
}
if(!$this->TRUE_COLOR)
{
exit($this->ERROR['unavilable']);
}
else
{
$OUT($this->TRUE_COLOR,$this->DEST_URL);
$OUT($this->TRUE_COLOR);
}
}
}
/*
析构函数：释放图片
*/
function __destruct()
{
/*释放图片*/
imagedestroy($this->TRUE_COLOR);
imagedestroy($this->PICTURE_CREATE);
}
//end of class
}
?>
希望本文所述对大家的PHP程序设计有所帮助。
