php生成缩略图类,支持自定义高和宽,还支持按高和宽截图

发布:smiling　来源: PHP粉丝网　添加日期：2014-08-19 10:01:57　浏览: 评论：0　

php生成缩略图类,支持自定义高和宽,还支持按高和宽截图,实例代码如下:

<?php

class resizeimage

{

    //图片类型

    var $type;

    //实际宽度

    var $width;

    //实际高度

    var $height;

    //改变后的宽度

    var $resize_width;

    //改变后的高度

    var $resize_height;

    //是否裁图

    var $cut;

    //源图象

    var $srcimg;

    //目标图象地址

    var $dstimg;

    //临时创建的图象

    var $im;

    function resizeimage($img, $wid, $hei,$c,$dstpath)

    {  //开源代码phpfensi.com

        $this->srcimg = $img;

        $this->resize_width = $wid;

        $this->resize_height = $hei;

        $this->cut = $c;

        //图片的类型

$this->type = strtolower(substr(strrchr($this->srcimg,"."),1));

        //初始化图象

        $this->initi_img();

        //目标图象地址

        $this -> dst_img($dstpath);

        //--

        $this->width = imagesx($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($ratio<$resize_ratio)

            //宽度优先

            {

                $newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);

                imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, $this->resize_height, $this->width, (($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($ratio<$resize_ratio)

            {

                $newimg = imagecreatetruecolor(($this->resize_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($dstpath)

    {

        $full_length  = strlen($this->srcimg);

        $type_length  = strlen($this->type);

        $name_length  = $full_length-$type_length;

        $name         = substr($this->srcimg,0,$name_length-1);

        $this->dstimg = $dstpath;

//echo $this->dstimg;

    }

}

$resizeimage = new resizeimage("11.jpg", "200", "150", "1","17.jpg");