php的缩放图像类使用

luobo2ni

function resizeimage($img, $wid, $hei,$c)　　{
　　$this->srcimg = $img;
　　$this->resize_width = $wid;
　　$this->resize_height = $hei;
　　$this->cut = $c;
　　//图片的类型
　　$this->type = substr(strrchr($this->srcimg,"."),1);
　　//初始化图象
　　$this->initi_img();
　　//目标图象地址
　　$this -> dst_img();
　　//--
　　$this->width = imagesx($this->im);
　　$this->height = imagesy($this->im);
　　//生成图象
　　$this->newimg();
　　ImageDestroy ($this->im);
　　}
　　function newimg()
　　{
　　//改变后的图象的比例
　　$resize_ratio = ($this->resize_width)/($this->resize_height);
　　//实际图象的比例
　　$ratio = ($this->width)/($this->height);
　　if(($this->cut)=="1")
　　//裁图
　　{
　　if($ratio>=$resize_ratio)
　　//高度优先
　　{
　　$newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);
　　imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width,$this->resize_height, (($this->height)*$resize_ratio), $this->height);
　　ImageJpeg ($newimg,$this->dstimg);
　　}
　　if($ratioresize_width,$this->resize_height);
　　imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, $this->resize_height, $this->width, (($this->width)/$resize_ratio));
　　ImageJpeg ($newimg,$this->dstimg);
　　}
　　}
　　else
　　//不裁图
　　{
　　if($ratio>=$resize_ratio)
　　{
　　$newimg = imagecreatetruecolor($this->resize_width,($this->resize_width)/$ratio);
　　imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, ($this->resize_width)/$ratio, $this->width, $this->height);
　　ImageJpeg ($newimg,$this->dstimg);
　　}
　　if($ratioresize_height)*$ratio,$this->resize_height);
　　imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, ($this->resize_height)*$ratio, $this->resize_height, $this->width, $this->height);
　　ImageJpeg ($newimg,$this->dstimg);
　　}
　　}
　　}
　　//初始化图象
　　function initi_img()
　　{
　　if($this->type=="jpg")
　　{
　　$this->im = imagecreatefromjpeg($this->srcimg);
　　}
　　if($this->type=="gif")
　　{
　　$this->im = imagecreatefromgif($this->srcimg);
　　}
　　if($this->type=="png")
　　{
　　$this->im = imagecreatefrompng($this->srcimg);
　　}
　　}
　　//图象目标地址
　　function dst_img()
　　{
　　$full_length  = strlen($this->srcimg);
　　$type_length  = strlen($this->type);
　　$name_length  = $full_length-$type_length;
　　$name         = substr($this->srcimg,0,$name_length-1);
　　$this->dstimg = $name."s.".$this->type;
　　}
　　}
　　?>