|
![]() |
名片设计 CorelDRAW Illustrator AuotoCAD Painter 其他软件 Photoshop Fireworks Flash |
|
<? /***************************************/ /*功 能:利用PHP的GD库生成高质量的缩略图*/ /*运行环境:PHP5.01/GD2*/ /*类说明:可以选择是/否裁图。 假如裁图则生成的图的尺寸与您输入的相同。 原则:尽可能多保持原图完整 假如不裁图,则按照原图比例生成新图 原则:根据比例以输入的长或者宽为基准*/ /*参 数:$img:源图片地址 $wid:新图的宽度 $hei:新图的高度 $c:是否裁图,1为是,0为否*/ /***************************************/ 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????建的图象 var $im; function resizeimage($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,$this->dstimg); } if($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() { $full_length = strlen($this->srcimg); $type_length = strlen($this->type); $name_length = $full_length-$type_length; $name = substr($this->srcimg,0,$name_length-1); $this->dstimg = $name."_small.".$this->type; } } ?> 使用方式: <? require "resizeimage.php"; $resizeimage = new resizeimage("test.jpg", "200", "200", "0"); ?> <table width="200" height="200" cellspacing="0" cellpadding="0" border="0"> <tr> <td bgcolor="#000000" align="center" valign="middle"><a href="test.jpg" target="_blank"><img src="test_small.jpg" border="0"></a><td> </tr> </table> 返回类别: 教程 上一教程: 关于如何提高PHP速度的一些文章 下一教程: 自动生成静态页面 您可以阅读与"利用GD库生成高质量缩略图"相关的教程: · 高质量缩略图的生成函数(多种剪切模式,按高度宽度最佳缩放等) · 关于生成缩略图的问题,各位大侠请进来 · 不用GD库生成当前时间的PNG格式图象的程序 · 不用GD库生成当前时间的PNG格式图象的程序 · 不用GD库生成当前时间的PNG格式图象的程序 |
![]() ![]() |
快精灵印艺坊 版权所有 |
首页![]() ![]() ![]() ![]() ![]() ![]() ![]() |