<?php

// Resize Fill Area, Preserve Proportions and Center the Image
// Part III of the Building thumbnails tutorial
// (c) 2008 Scriptol.com


// Getting the type of the image

$types = array("jpeg"=>IMG_JPG, "jpg"=>IMG_JPG, "gif"=>IMG_GIF, "png"=>IMG_PNG );

function getImageType($name)
{
  global $types;
  
  $way = pathinfo($name);
  $ext = strtolower($way['extension']);
  $t = $types[$ext];
  return $t;  
}


function resize_center($oldname)
{
  $newname = "thumb-". $oldname;

  // Dimensions of displayed thumbnail

  $thumbh = 150;
  $thumbw = 140;

  // Dimension of intermediate thumbnail

  $nh = $thumbh;
  $nw = $thumbw;
  
  // Offsets to center the image
  
  $xoff = 0;
  $yoff = 0;
  

  $size = getImageSize($oldname);
  $w = $size[0];
  $h = $size[1];
  
  // Applying calculations to dimensions of the image
 
  $ratio = $h / $w;
  $nratio = $thumbh / $thumbw; 

  if($ratio > $nratio)
  {
    $x = intval($w * $nh / $h);
    if ($x < $nw)
    {
      $nh = intval($h * $nw / $w);
    } 
    else
    {
      $nw = $x;
    }
    $yoff = intval(($nh - $thumbh) / 2); 
  }
  else
  {
    $x = intval($h * $nw / $w);
    if ($x < $nh)
    {
      $nw = intval($w * $nh / $h);
    } 
    else
    {
      $nh = $x;
    }
    $xoff = intval(($nw - $thumbw) / 2);
  }  
 
  echo "$oldname was $w x $h,";
  echo "  $newname is $nw x $nh cropped to $thumbw x $thumbh\n";

  // Building the intermediate resized thumbnail

  $t = getImageType($oldname); 

  switch($t)
  {
    case IMG_JPG: $resimage = imagecreatefromjpeg($oldname);
                  break;
    case IMG_GIF: $resimage = imagecreatefromgif($oldname);
                  break;
    case IMG_PNG: $resimage = imagecreatefrompng($oldname);
                  break;                  
  }  
  $newimage = imagecreatetruecolor($nw, $nh);  // use alternate function if not installed
  imageCopyResampled($newimage, $resimage,0,0,0,0,$nw, $nh, $w, $h);
  
 
  // Making the final cropped thumbnail
  
  $viewimage = imagecreatetruecolor($thumbw, $thumbh);
  imagecopy($viewimage, $newimage, 0, 0, $xoff, $yoff, $nw, $nh);
  
  // saving
  imageJpeg($viewimage, $newname, 85);
}  

// List of images for demo: the script on scriptol.com will take them from a directory

$ilist = array("cubes.jpg", "bluedoom.gif", "garden.jpg", "grayhouse.png", "redtree.jpg");

foreach ($ilist as $iname)
{
  if(!file_exists($iname))
  { 
    echo "$iname not found\n";
    continue;
  }  
  resize_center($iname);
}

?>