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php实现图片按比例截取的方法
•php图像处理•阅读 337 - filename ='img/test.jpg'
- $all_type=array(
- "jpg" =>array("create"=>"ImageCreateFromjpeg","output"=>"imagejpeg" ,"exn"=>".jpg"),
- "gif" =>array("create"=>"ImageCreateFromGIF","output"=>"imagegif" ,"exn"=>".gif"),
- "jpeg" =>array("create"=>"ImageCreateFromjpeg","output"=>"imagejpeg" ,"exn"=>".jpg"),
- "png" =>array("create"=>"imagecreatefrompng","output"=>"imagepng" ,"exn"=>".png"),
- "wbmp" =>array("create"=>"imagecreatefromwbmp","output"=>"image2wbmp","exn"=>".wbmp")
- );
- $imgtype=getimagesize($filename);
- $width=$imgtype[0];
- $height=$imgtype[1];
- $type=str_replace('image/','',$imgtype['mime']);
- $func_create=$all_type[$type]['create'];
- $func_output=$all_type[$type]['output'];
- $x=$y=0;
- if(($width* 100)>($height* 120))
- {
- $newwidth=ceil($height* 120/100);
- $newheight=$height;
- $x= ($width-$newwidth)/2;
- }
- elseif(($width* 100)<($height* 120))
- {
- $newheight=ceil($width* 100/120);
- $newwidth=$width;
- $y= ($height-$newheight)/2;
- }
- else
- {
- $newheight=$height;
- $newwidth=$width;
- }
- // Load
- $thumb= imagecreatetruecolor($newwidth,$newheight);
- $source=$func_create($filename);
- // Resize
- imagecopyresized($thumb,$source, 0, 0, 0, 0,$newwidth,$newheight,$newwidth,$newheight);
- // Output
- $func_output($thumb,'a.jpeg');