return $this->im;
}
/*
*合并图片（如图片水影）
*@param string/resource $file 图片文件路径或这图片标识符
*@param array $arg 字符串相关的参数，为一个关联数组，left 为距左边距离，right为距右边距离，left优先，top为距顶部距离，bottom为距底部距离，top优先；touming为文字透明度
*/
function merge($file,$arg = array()) {
if(is_file($file)) {
$imc = $this->create($file);
}elseif(gettype($file)=='resource') {
$imc = $file;
}else {
error("没有图片");
}
$touming = $arg['touming'] ? (int)$arg['touming'] : 100 ;
$w = imagesx($this->im);
$h = imagesy($this->im);
$width = imagesx($imc);
$height = imagesy($imc);
if(isset($arg['left'])) {
$x = (int)$arg['left'];
}elseif (isset($arg['right'])){
$x = $w - (int)$arg['right'] - $width;
}else {
$x = ($w - $width)/2;
}
if(isset($arg['top'])) {
$y = (int)$arg['top'];
}elseif (isset($arg['bottom'])){
$y = $h - $height - $arg['bottom'];
}else {
$y = ($h - $height)/2;
}
imagecopymergegray($this->im,$imc,$x,$y,0,0,$width,$height,$touming);
}
/*
*输出图片
*@param string $type
