本图像处理类可以完成对图片的缩放、加水印和裁剪的功能，支持多种图片类型的处理，缩放时进行优化等。
path = rtrim($path,"/")."/";
}
function thumb($name, $width, $height,$qz="th_"){
$imgInfo = $this->getInfo($name);
$srcImg = $this->getImg($name, $imgInfo);
$size = $this->getNewSize($name,$width, $height,$imgInfo);
$newImg = $this->kidOfImage($srcImg, $size,$imgInfo);
return $this->createNewImage($newImg, $qz.$name,$imgInfo);
}
function waterMark($groundName, $waterName, $waterPos=0, $qz="wa_"){
$curpath = rtrim($this->path,"/")."/";
$dir = dirname($waterName);
if($dir == "."){
$wpath = $curpath;
}else{
$wpath = $dir."/";
$waterName = basename($waterName);
}
if(file_exists($curpath.$groundName) && file_exists($wpath.$waterName)){
$groundInfo = $this->getInfo($groundName); //获取背景信息
$waterInfo = $this->getInfo($waterName, $dir); //获取水印图片信息
if(!$pos = $this->position($groundInfo, $waterInfo, $waterPos)){
echo '水印不应该比背景图片小！';
return false;
}
$groundImg = $this->getImg($groundName, $groundInfo); //获取背景图像资源
$waterImg = $this->getImg($waterName, $waterInfo, $dir); //获取水印图片资源
$groundImg = $this->copyImage($groundImg, $waterImg, $pos, $waterInfo);
return $this->createNewImage($groundImg, $qz.$groundName, $groundInfo);
}else{
echo '图片或水印图片不存在！';
return false;
}
}
function cut($name, $x, $y, $width, $height, $qz="cu_"){
$imgInfo=$this->getInfo($name); //获取图片信息
if( (($x+$width) > $imgInfo['width']) || (($y+$height) > $imgInfo['height'])){
echo "裁剪的位置超出了背景图片范围!";
return false;
}
$back = $this->getImg($name, $imgInfo); //获取图片资源
$cutimg = imagecreatetruecolor($width, $height);
imagecopyresampled($cutimg, $back, 0, 0, $x, $y, $width, $height, $width, $height);
imagedestroy($back);
return $this->createNewImage($cutimg, $qz.$name,$imgInfo);
}
private function position($groundInfo, $waterInfo, $waterPos){
if( ($groundInfo["width"]<$waterInfo["width"]) || ($groundInfo["height"]<$waterInfo["height"]) ) {
return false;
}
switch($waterPos) {
case 1: //1为顶端居左
$posX = 0;
$posY = 0;
break;
case 2: //2为顶端居中
$posX = ($groundInfo["width"] - $waterInfo["width"]) / 2;
$posY = 0;
break;
case 3: //3为顶端居右
$posX = $groundInfo["width"] - $waterInfo["width"];
$posY = 0;
break;
case 4: //4为中部居左
$posX = 0;
$posY = ($groundInfo["height"] - $waterInfo["height"]) / 2;
break;
case 5: //5为中部居中
$posX = ($groundInfo["width"] - $waterInfo["width"]) / 2;
$posY = ($groundInfo["height"] - $waterInfo["height"]) / 2;
break;
case 6: //6为中部居右
$posX = $groundInfo["width"] - $waterInfo["width"];
$posY = ($groundInfo["height"] - $waterInfo["height"]) / 2;
break;
case 7: //7为底端居左
$posX = 0;
$posY = $groundInfo["height"] - $waterInfo["height"];
break;
case 8: //8为底端居中
$posX = ($groundInfo["width"] - $waterInfo["width"]) / 2;
$posY = $groundInfo["height"] - $waterInfo["height"];
break;
case 9: //9为底端居右
$posX = $groundInfo["width"] - $waterInfo["width"];
$posY = $groundInfo["height"] - $waterInfo["height"];
break;
case 0:
default: //随机
$posX = rand(0,($groundInfo["width"] - $waterInfo["width"]));
$posY = rand(0,($groundInfo["height"] - $waterInfo["height"]));
break;
}
return array("posX"=>$posX, "posY"=>$posY);
}
private function getInfo($name, $path=".") {
$spath = $path=="." ? rtrim($this->path,"/")."/" : $path.'/';
$data = getimagesize($spath.$name);
$imgInfo["width"] = $data[0];
$imgInfo["height"] = $data[1];
$imgInfo["type"] = $data[2];
return $imgInfo;
}
private function getImg($name, $imgInfo, $path='.'){
$spath = $path=="." ? rtrim($this->path,"/")."/" : $path.'/';
$srcPic = $spath.$name;
switch ($imgInfo["type"]) {
case 1: //gif
$img = imagecreatefromgif($srcPic);
break;
case 2: //jpg
$img = imagecreatefromjpeg($srcPic);
break;
case 3: //png
$img = imagecreatefrompng($srcPic);
break;
default:
return false;
break;
}
return $img;
}
private function getNewSize($name, $width, $height, $imgInfo){
$size["width"] = $imgInfo["width"]; //原图片的宽度
$size["height"] = $imgInfo["height"]; //原图片的高度
if($width < $imgInfo["width"]){
$size["width"]=$width; //缩放的宽度如果比原图小才重新设置宽度
}
if($height < $imgInfo["height"]){
$size["height"] = $height; //缩放的高度如果比原图小才重新设置高度
}
if($imgInfo["width"]*$size["width"] > $imgInfo["height"] * $size["height"]){
$size["height"] = round($imgInfo["height"]*$size["width"]/$imgInfo["width"]);
}else{
$size["width"] = round($imgInfo["width"]*$size["height"]/$imgInfo["height"]);
}
return $size;
}
private function createNewImage($newImg, $newName, $imgInfo){
$this->path = rtrim($this->path,"/")."/";
switch ($imgInfo["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 $newName;
}
private function copyImage($groundImg, $waterImg, $pos, $waterInfo){
imagecopy($groundImg, $waterImg, $pos["posX"], $pos["posY"], 0, 0, $waterInfo["width"],$waterInfo["height"]);
imagedestroy($waterImg);
return $groundImg;
}
private function kidOfImage($srcImg, $size, $imgInfo){
$newImg = imagecreatetruecolor($size["width"], $size["height"]);
$otsc = imagecolortransparent($srcImg);
if( $otsc >= 0 && $otsc < imagecolorstotal($srcImg)) {
$transparentcolor = imagecolorsforindex( $srcImg, $otsc );
$newtransparentcolor = imagecolorallocate(
$newImg,
$transparentcolor['red'],
$transparentcolor['green'],
$transparentcolor['blue']
);
imagefill( $newImg, 0, 0, $newtransparentcolor );
imagecolortransparent( $newImg, $newtransparentcolor );
}
imagecopyresized( $newImg, $srcImg, 0, 0, 0, 0, $size["width"], $size["height"], $imgInfo["width"], $imgInfo["height"] );
imagedestroy($srcImg);
return $newImg;
}
}
