php图像处理类

class Image

{

//保存目录

protected $savePath;

//随机名字

protected $randName;

//图片后缀

protected $extension;

//保存文件名

protected $saveFileName;

public function __construct(

$savePath='./',

$randName=true,

$extension='png'

)

{

$this->savePath = $savePath;

$this->randName = $randName;

$this->extension = $extension;

}

public function setOption($name,$value=null)

{

if (is_array($name)) {

foreach ($name as $k => $v) {

$this->$k = $v;

}

} else {

$this->$name = $value;

}

}

public function getSaveFile()

{

return $this->saveFileName;

}

public function waterMark($dstPath,$srcPath,$pos=9,$pct=100)

{

//1、文件目录检测

if (!is_file($dstPath)) {

return '目标大图不存在';

} else if (!is_file($srcPath)) {

return '水印小图不存在';

} else if (!is_dir($this->savePath)) {

return '保存路径不存在';

} else if (!is_writable($this->savePath)) {

return '保存路径不可写';

}

//2、判断图片尺寸

list($dstWidth,$dstHeight) = getimagesize($dstPath);

list($srcWidth,$srcHeight) = getimagesize($srcPath);

if ($srcWidth > $dstWidth || $srcHeight > $dstHeight) {

return '水印图片尺寸过大';

}

//3、计算水印在目标图片上的位置

if ($pos>=1 && $posopenImage($dstPath);

$srcImg = $this->openImage($srcPath);

imagecopymerge($dstImg, $srcImg, $offsetX, $offsetY, 0, 0, $srcWidth, $srcHeight, $pct);

//5、保存图片

$this->saveImage($dstImg,$dstPath);

//6、释放资源

imagedestroy($dstImg);

imagedestroy($srcImg);

//7、返回保存文件的路径

return $this->saveFileName;

}

protected function openImage($imagePath)

{

$info = getimagesize($imagePath);

$extension = image_type_to_extension($info[2],false);

$openFunc = 'imagecreatefrom' . $extension;

return $openFunc($imagePath);

}

protected function saveImage($image,$path)

{

//路径

$this->saveFileName = rtrim($this->savePath,'/') . '/';

$info = pathinfo($path);

//名字

if ($this->randName) {

$this->saveFileName .= uniqid();

} else {

$this->saveFileName .= $info['filename'];

}

//后缀

if (empty($this->extension)) {

$this->extension = $info['extension'];

} else {

$this->extension = ltrim($this->extension,'.');

}

//完整路径名

$this->saveFileName .= '.' . $this->extension;

//保存图片

if ($this->extension == 'jpg') {

$this->extension = 'jpeg';

}

$saveFunc = 'image' . $this->extension;

$saveFunc($image,$this->saveFileName);

//返回保存的文件路径名

return $this->saveFileName;

}

public function zoomImage($imgPath,$width,$height)

{

//1、检查文件目录

if (!file_exists($imgPath)) {

return '图片路径不存在';

} else if (!is_dir($this->savePath)) {

return '保存路径不存在';

} else if (!is_writable($this->savePath)) {

return '保存路径不可写';

}

//2、计算尺寸

list($srcWidth,$srcHeight) = getimagesize($imgPath);

$size = $this->getSize($width,$height,$srcWidth,$srcHeight);

//3、合并图片

$dstImg = imagecreatetruecolor($width,$height);

$srcImg = $this->openImage($imgPath);

$this->mergeImage($dstImg,$srcImg,$size);

//4、保存图片

$this->saveImage($dstImg,$imgPath);

//5、释放资源

imagedestroy($dstImg);

imagedestroy($srcImg);

//6、返回保存的文件路径名

return $this->saveFileName;

}

protected function mergeImage($dstImg,$srcImg,$size)

{

//获取原始图片的透明色

$lucidColor = imagecolortransparent($srcImg);

if ($lucidColor == -1) {

//如果没有透明色，默认设置黑色为透明色

$lucidColor = imagecolorallocate($dstImg, 0, 0, 0);

}

//用透明色填充图片

imagefill($dstImg, 0, 0, $lucidColor);

//设置透明色

imagecolortransparent($dstImg,$lucidColor);

//合并图片

imagecopyresampled($dstImg, $srcImg, $size['offsetX'], $size['offsetY'], 0, 0, $size['newWidth'], $size['newHeight'], $size['srcWidth'], $size['srcHeight']);

}

protected function getSize($width,$height,$srcWidth,$srcHeight)

{

//保存原始尺寸

$size['srcWidth'] = $srcWidth;

$size['srcHeight'] = $srcHeight;

//计算缩放比例

$scaleWidth = $width / $srcWidth;

$scaleHeight = $height / $srcHeight;

$scaleFinal = min($scaleWidth,$scaleHeight);

//保存实际尺寸

$size['newWidth'] = $srcWidth * $scaleFinal;

$size['newHeight'] = $srcHeight * $scaleFinal;

//计算偏移尺寸

if ($scaleWidth < $scaleHeight) {

$size['offsetX'] = 0;

$size['offsetY'] = round(($height - $size['newHeight'])/2);

} else {

$size['offsetY'] = 0;

$size['offsetX'] = round(($width - $size['newWidth'])/2);

}

return $size;

}

}

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