[php]
<?php
/***************************************************************************
* miniature.php
* ------------------------------
* Date : Feb 26, 2006
* Copyright : (C) 2006 - 剑枫
* Mail : egmax@163.com
*
* 作用:缩略图.
* 应用:
include('miniature.php');
$vres = miniature('源图_name', '缩图_name',缩图宽,缩图高,维持比例);
echo $vres;
*
*
***************************************************************************/
function miniature($big_image_name, $new_name, $max_width = 400, $max_height = 400, $resize = 1)
{
if($temp_img_type = @getimagesize($big_image_name)) {eregi('/([a-z]+)$', $temp_img_type[mime], $tpn); $img_type = $tpn[1];}
else {eregi('.([a-z]+)$', $big_image_name, $tpn); $img_type = $tpn[1];}
$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")
);
$func_create = $all_type[$img_type]['create'];
if(empty($func_create) or !function_exists($func_create)) return false;
$func_output = $all_type[$img_type]['output'];
$func_exname = $all_type[$img_type]['exn'];
$big_image = $func_create($big_image_name);
$big_width = imagesx($big_image);
$big_height = imagesy($big_image);
if($big_width <= $max_width and $big_height <= $max_height) { $func_output($big_image, $new_name.$func_exname); return true; }
$ratiow = $max_width / $big_width;
$ratioh = $max_height / $big_height;
if($resize == 1) {
if($big_width >= $max_width and $big_height >= $max_height)
{
if($big_width > $big_height)
{
$tempx = $max_width / $ratioh;
$tempy = $big_height;
$srcX = ($big_width - $tempx) / 2;
$srcY = 0;
} else {
$tempy = $max_height / $ratiow;
$tempx = $big_width;
$srcY = ($big_height - $tempy) / 2;
$srcX = 0;
}
} else {
if($big_width > $big_height)
{
$tempx = $max_width;
$tempy = $big_height;
$srcX = ($big_width - $tempx) / 2;
$srcY = 0;
} else {
$tempy = $max_height;
$tempx = $big_width;
$srcY = ($big_height - $tempy) / 2;
$srcX = 0;
}
}
} else {
$srcX = 0;
$srcY = 0;
$tempx = $big_width;
$tempy = $big_height;
}
$new_width = ($ratiow > 1) ? $big_width : $max_width;
$new_height = ($ratioh > 1) ? $big_height : $max_height;
if(function_exists("imagecopyresampled"))
{
$temp_image = imagecreatetruecolor($new_width, $new_height);
imagecopyresampled($temp_image, $big_image, 0, 0, $srcX, $srcY, $new_width, $new_height, $tempx, $tempy);
} else {
$temp_image = imagecreate($new_width, $new_height);
imagecopyresized($temp_image, $big_image, 0, 0, $srcX, $srcY, $new_width, $new_height, $tempx, $tempy);
}
$func_output($temp_image, $new_name.$func_exname);
ImageDestroy($big_image);
ImageDestroy($temp_image);
return true;
}
?>
[/php]
按比例产生缩略图，缩小后图片效果不变形，如果超高则纵向截取，如果超长则横向截取。 |
发表于 2006-3-12 07:41 PM
| 
