php - 使用 php 调整图像大小

Question

我正在使用一个简洁的小 php 脚本来调整我的图像大小以适应 300x300 像素的正方形，同时保持纵横比。我从 here 得到脚本.

这是整个脚本:

<?php

/*
* File: SimpleImage.php
* Author: Simon Jarvis
* Copyright: 2006 Simon Jarvis
* Date: 08/11/06
* Link: http://www.white-hat-web-design.co.uk/articles/php-image-resizing.php
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details:
* http://www.gnu.org/licenses/gpl.html
*
*/

class SimpleImage {

   var $image;
   var $image_type;

   function load($filename) {

      $image_info = getimagesize($filename);
      $this->image_type = $image_info[2];
      if( $this->image_type == IMAGETYPE_JPEG ) {

         $this->image = imagecreatefromjpeg($filename);
      } elseif( $this->image_type == IMAGETYPE_GIF ) {

         $this->image = imagecreatefromgif($filename);
      } elseif( $this->image_type == IMAGETYPE_PNG ) {

         $this->image = imagecreatefrompng($filename);
      }
   }
   function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null) {

      if( $image_type == IMAGETYPE_JPEG ) {
         imagejpeg($this->image,$filename,$compression);
      } elseif( $image_type == IMAGETYPE_GIF ) {

         imagegif($this->image,$filename);
      } elseif( $image_type == IMAGETYPE_PNG ) {

         imagepng($this->image,$filename);
      }
      if( $permissions != null) {

         chmod($filename,$permissions);
      }
   }
   function output($image_type=IMAGETYPE_JPEG) {

      if( $image_type == IMAGETYPE_JPEG ) {
         imagejpeg($this->image);
      } elseif( $image_type == IMAGETYPE_GIF ) {

         imagegif($this->image);
      } elseif( $image_type == IMAGETYPE_PNG ) {

         imagepng($this->image);
      }
   }
   function getWidth() {

      return imagesx($this->image);
   }
   function getHeight() {

      return imagesy($this->image);
   }
   function resizeToHeight($height) {

      $ratio = $height / $this->getHeight();
      $width = $this->getWidth() * $ratio;
      $this->resize($width,$height);
   }

   function resizeToWidth($width) {
      $ratio = $width / $this->getWidth();
      $height = $this->getheight() * $ratio;
      $this->resize($width,$height);
   }

   function scale($scale) {
      $width = $this->getWidth() * $scale/100;
      $height = $this->getheight() * $scale/100;
      $this->resize($width,$height);
   }

   function resize($width,$height) {
      $new_image = imagecreatetruecolor($width, $height);
      imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
      $this->image = $new_image;
   }      

}
?>

下面是我的使用方式:

    $image = new SimpleImage();
    $image->load($_FILES['uploaded_image']['tmp_name']);
    $image->resizeToWidth(300);
    $image->resizeToHeight(300);
    $image->save('./images/photo'.$id.'.jpg');
    header("Location: people.php");
    exit;

这是我的问题: 它只会调整高度。因此，如果我给它一张 1200x990(宽 x 高)的图像，它会输出一个 400x300(如果有意义的话)，这不适合我的 300x300 正方形。

我也试过:

    $image = new SimpleImage();
    $image2 = new SimpleImage();
    $image->load($_FILES['uploaded_image']['tmp_name']);
    $image->resizeToWidth(300);
    $image->save('temp.jpg');
    $image2->load('temp.jpg');
    $image2->resizeToHeight(300);
    $image2->save('./images/photo'.$id.'.jpg');
    unlink('temp.jpg');
    header("Location: people.php");
    exit;

对于大量可怕的代码，我感到抱歉，我想我最好包括源代码，以防万一我从中获取它的地方移动或关闭。

那里有敬虔的程序员吗？

Answer 1

它工作正常 - 将高度调整为 300 并保持纵横比(在本例中，宽度为 400)。您需要先查看哪一侧是最大的一侧(或者更准确地说，是离您需要的纵横比最远的一侧)，然后只调用一个函数(resizeToWidth() 或 resizeToHeight())。

如果我必须使用那个类，我认为这会起作用:

$image = new SimpleImage();
$size = getImageSize($_FILES['uploaded_image']['tmp_name']);
if ($size[0] > 300) {
    $image->load($_FILES['uploaded_image']['tmp_name']);
    $image->resizeToWidth(300);
    $image->save('./images/photo'.$id.'.jpg');
} else {
    move_uploaded_file($_FILES['uploaded_image']['tmp_name'], './images/photo'.$id.'.jpg');
}

$size = getImageSize('./images/photo'.$id.'.jpg');
if ($size[1] > 300) {
    $image->load('./images/photo'.$id.'.jpg');
    $image->resizeToHeight(300);
    $image->save('./images/photo'.$id.'.jpg');
}

header("Location: people.php");
exit;