php实现图片按比例截取的方法
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2022-04-11 15:43:41
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这篇文章主要介绍了php实现图片按比例截取的方法,涉及php针对图形的读取、运算及生成相关操作技巧,具有一定参考借鉴价值,需要的朋友可以参考下
本文实例讲述了php实现图片按比例截取的方法。分享给大家供大家参考,具体如下:
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');
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