PHP 添加水印 & 比例缩略图 & 固定高度 & 固定宽度 类。

//PHP 添加水印 & 比例缩略图 & 固定高度 & 固定宽度 类。
class Image_process{
    public $source; //原图
    public $source_width;   //原图宽度
    public $source_height;  //原图高度
    public $source_type_id;
    public $orign_name;
    public $orign_dirname;

    //传入原图路径
    public function __construct($source){
        $this->typeList = array(1=>'gif',2=>'jpg',3=>'png');
        $ginfo = getimagesize($source);
        $this->source_width = $ginfo[0];
        $this->source_height = $ginfo[1];
        $this->source_type_id = $ginfo[2];
        $this->orign_url = $source;
        $this->orign_name = basename($source);
        $this->orign_dirname = dirname($source);
    }

    //判断图片的文件的格式，返回PHP可识别的编码
    public function judgeType($type,$source){
        if($type == 1){
            return imagecreatefromgif($source); //gif
        }else if($type == 2){
            return imagecreatefromjpeg($source); //jpg
        }else if($type == 3){
            return imagecreatefrompng($source); //png
        }else{
            return false;
        }
    }

    //生成水印图片
    public function waterMakeImage($logo){
        $linfo = getimagesize($logo);
        $logo_width = $linfo[0];
        $logo_height = $linfo[1];
        $logo_type_id = $linfo[2];
        $sourceHandle = $this->judgeType($this->source_type_id,$this->orign_url);
        $logoHandle = $this->judgeType($logo_type_id,$logo);
        if(!$sourceHandle || !$logoHandle){
            return false;
        }
        $x = ($this->source_width - $logo_width)/2;
        $y = ($this->source_height - $logo_height)/2;
        imagecopy($sourceHandle,$logoHandle,$x,$y,0,0,$logo_width,$logo_height);
        $newPic = $this->orign_dirname.'\water_'.time().'.'.$this->typeList[$this->source_type_id];
        if($this->saveImage($sourceHandle,$newPic)){
            imagedestroy($sourceHandle);
            imagedestroy($logoHandle);
        }
    }

    //固定高度宽度
    public function fixSizeImage($width,$height){
        if($width > $this->source_width) $this->source_width;
        if($height > $this->source_height) $this->source_height;
        if($width === false){
            $width = floor($this->source_width / ($this->source_height / $height));
        }
        if($height === false){
            $height = floor($this->source_height / ($this->source_width / $width));
        }
        $this->tinyImage($width,$height);
    }

    //等比例缩放图片
    public function scaleImage($scale){
        $width = floor($this->source_width * $scale);
        $height = floor($this->source_height * $scale);
        $this->tinyImage($width, $height);
    }

    //创建缩略图
    public function tinyImage($width,$height){
        $tinyImage = imagecreatetruecolor($width,$height);
        $handle = $this->judgeType($this->source_type_id,$this->orign_url);
        if(function_exists('imagecopyresampled')){
            imagecopyresampled($tinyImage, $handle, 0, 0, 0, 0, $width, $height, $this->source_width, $this->source_height);
        }else{
            imagecopyresized($tinyImage, $handle, 0, 0, 0, 0, $width, $height, $this->source_width, $this->source_height);
        }
        $newPic = $this->orign_dirname.'\thumb_'.time().'_'.$width."_".$height.".".$this->typeList[$this->source_type_id];
        if($this->saveImage($tinyImage,$newPic)){
            imagedestroy($tinyImage);
            imagedestroy($handle);
        }
    }
    //保存图片
    private function saveImage($image,$url){
        if(imagejpeg($image,$url)){
            return true;
        }
    }
}
$imgHandle = new Image_process('D:\AppServ\www\test\getimg\14061907445601.jpg');
//$imgHandle->waterMakeImage('D:\AppServ\www\test\getimg\shougongke.png');   //生成水印图片
//$imgHandle->fixSizeImage(200,150); //固定长度图片
$imgHandle->scaleImage(0.2); //等比例缩放
?>

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