PHP Image Crop from Resize

[joro]

Alright, I am having a problem modifying this code to make it work. This script is one that allows me to upload a full size image and from it create a thumbnail version. I want the image to scale proportionally but I want the script to crop from the center for larger images. So, for example, right now I upload a horizontal image and I wind up with an image that is 150 x 99 or flipped if vertical.

What can I add to this code to make it center crop so that the thumbnail is exactly 150 x 150? :confused:

<?php
class Image {
var $FileName;
var $FileSize;
var $FileType;
var $AllowedExtentions = array ("image/png", "image/gif", "image/jpeg", "image/pjpeg", "image/jpg");
var $newWidth = 150; // new width
var $newHeight;
var $TmpName;
var $PicDir; //store uploaded images
var $MaxFileSize = 2000000; //kbytes
var $ImageQuality = 100; // image compression (max value 100)

function Image($FileName) {
$this->FileName=$FileName;
}

function GetInfo() {
$out=' <br><br>Upload success!<br>
Name: '.$this->FileName.'<br>
file size: '.$this->FileSize.' byte<br>
file type: '.$this->FileType.'<br>
<img src=' . dirname($_SERVER['PHP_SELF']) . '/' . $this->PicDir . $this->FileName . '><br><br>';

return $out;
}


function GetFileExtention ($FileName) {
if (in_array ($this->FileType, $this -> AllowedExtentions)) {
return true;
} else {
return false;
}

}

function ExistFile () {
$fileexist = $_SERVER['DOCUMENT_ROOT'] .
dirname($_SERVER['PHP_SELF']) .
'/' . $this->PicDir .
$this->FileName;
if (file_exists($fileexist)) { return true; }
}

function GetError ($error) {

switch ($error) {
case 0 :
echo "Error: Invalid file type <b>$this->FileType</b>! Allow type: .jpg, .jpeg, .gif, .png <b>$this->FileName</b><br>";
break;

case 1 :
echo "Error: File <b>$this->FileSize</b> is too large! You must upload 1000 MB file<br>";
break;

case 2 :
echo "Error: Please, select a file for uploading!<br>";
break;

case 3 :
echo "Error: File <b>$this->FileName</b> already exist!<br>";
break;
}

}


function Resize () {
if (empty ($this->TmpName)) {echo $this -> GetError (2);}
else if ($this->FileSize > $this->MaxFileSize) {echo $this -> GetError (1);}
else if ($this -> GetFileExtention ($this->FileName) == false) {echo $this -> GetError (0);}
else if ($this -> ExistFile()) {echo $this -> GetError (3);}

else {

$ext = explode(".",$this->FileName);
$ext = end($ext);
$ext = strtolower($ext);

// Get new sizes
list($width_orig, $height_orig) = getimagesize($this->TmpName);


$ratio_orig = $width_orig/$height_orig;

if ($this->newWidth/$this->newHeight > $ratio_orig) {
$this->newWidth = $this->newHeight*$ratio_orig;
} else {
$this->newHeight = $this->newWidth/$ratio_orig;
}



$normal = imagecreatetruecolor($this->newWidth, $this->newHeight);

if ($ext == "jpg") { $source = imagecreatefromjpeg($this->TmpName); }
else if ($ext == "gif") { $source = imagecreatefromgif($this->TmpName); }
else if ($ext == "png") { $source = imagecreatefrompng($this->TmpName); }

imagecopyresampled($normal, $source, 0, 0, 0, 0, $this->newWidth, $this->newHeight, $width_orig, $height_orig);


if ($ext == "jpg") {
//ob_start();
imagejpeg($normal, "$this->PicDir/$this->FileName", "$this->ImageQuality");
//$binaryThumbnail = ob_get_contents();
//ob_end_clean();
}
else if ($ext == "gif") { imagegif ($normal, "$this->PicDir/$this->FileName", "$this->ImageQuality"); }
else if ($ext == "png") { imagepng ($normal, "$this->PicDir/$this->FileName", "$this->ImageQuality"); }

imagedestroy($source);

//echo $this -> GetInfo();

}

}

function Save() {
if (empty ($this->TmpName)) {echo $this -> GetError (2);}
else if ($this->FileSize > $this->MaxFileSize) {echo $this -> GetError (1);}
else if ($this -> GetFileExtention ($this->FileName) == false) {echo $this -> GetError (0);}
else if ($this -> ExistFile ()) {echo $this -> GetError (3);}

else {

copy($this->TmpName,$this->PicDir.$this->FileName);

//echo $this -> GetInfo();

}
}
}

?>

[angelwatt]

Here's the math. You'll use the values in the imagecopyresampled function call inside the Resize function. I'll leave the implementation up to you for practice.

CenterX = round(thumb_width/2);
CenterY = round(thumb_height/2);
TopLeftX = CenterX - (150/2);
TopLeftY = CenterY - (150/2);