<?php
/*
* From http://net.tutsplus.com/tutorials/php/image-resizing-made-easy-with-php/
*
* Resize by exact width/height. (exact)
* Resize by width – exact width will be set, height will be adjusted according to aspect ratio. (landscape)
* Resize by height – like Resize by Width, but the height will be set and width adjusted dynamically. (portrait)
* Auto determine options 2 and 3. If you’re looping through a folder with different size photos, let the script determine how to handle this. (auto)
* Resize, then crop. This is my favourite. Exact size, no distortion. (crop)
*/
# ========================================================================#
#
# Author: Jarrod Oberto
# Version:	1.0
# Date: 17-Jan-10
# Purpose: Resizes and saves image
# Requires : Requires PHP5, GD library.
# Usage Example:
# include("classes/resize_class.php");
# $resizeObj = new resize('images/cars/large/input.jpg');
# $resizeObj -> resizeImage(150, 100, 0);
# $resizeObj -> saveImage('images/cars/large/output.jpg', 100);
#
#
# ========================================================================#
class resize
{
// *** Class variables
private $image;
private $width;
private $height;
private $imageResized;
public function __construct($fileName, $ext = false, $rotate = false)
{
// *** Open up the file
$this->image = $this->openImage($fileName, $ext, $rotate);
$this->imageResized = $this->image;
// *** Get width and height
$this->width = imagesx($this->image);
$this->height = imagesy($this->image);
}
## --------------------------------------------------------
public function getWidth()
{
// *** Return width
return $this->width;
}
## --------------------------------------------------------
public function getHeight()
{
// *** Return width
return $this->height;
}
## --------------------------------------------------------
private function openImage($file, $extension, $rotate)
{
// *** Get extension
if (!$extension) {
$extension = strrchr($file, '.');
}
$extension = strtolower($extension);
switch ($extension) {
case '.jpg':
case '.jpeg':
$img = @imagecreatefromjpeg($file);
if ($rotate) {
$img = imagerotate($img, $rotate, 0);
}
break;
case '.gif':
$img = @imagecreatefromgif($file);
if ($rotate) {
$img = imagerotate($img, $rotate, 0);
}
break;
case '.png':
$img = @imagecreatefrompng($file);
if ($rotate) {
$img = imagerotate($img, $rotate, 0);
}
break;
default:
$img = false;
break;
}
return $img;
}
## --------------------------------------------------------
public function resizeImage($newWidth, $newHeight, $option="auto")
{
// *** Get optimal width and height - based on $option
$optionArray = $this->getDimensions($newWidth, $newHeight, $option);
$optimalWidth = $optionArray['optimalWidth'];
$optimalHeight = $optionArray['optimalHeight'];
// *** Resample - create image canvas of x, y size
$this->imageResized = imagecreatetruecolor($optimalWidth, $optimalHeight);
imagecopyresampled($this->imageResized, $this->image, 0, 0, 0, 0, $optimalWidth, $optimalHeight, $this->width, $this->height);
#mail("mfurdyk@takingitglobal.org","image log","Looks like {$optimalWidth} {$optimalHeight}","From: IMG <info@takingitglobal.org>");
// *** if option is 'crop', then crop too
if ($option == 'crop') {
$this->crop($optimalWidth, $optimalHeight, $newWidth, $newHeight);
}
}
## --------------------------------------------------------
private function getDimensions($newWidth, $newHeight, $option)
{
switch ($option) {
case 'exact':
$optimalWidth = $newWidth;
$optimalHeight= $newHeight;
break;
case 'portrait':
$optimalWidth = $this->getSizeByFixedHeight($newHeight);
$optimalHeight= $newHeight;
break;
case 'landscape':
$optimalWidth = $newWidth;
$optimalHeight= $this->getSizeByFixedWidth($newWidth);
break;
case 'auto':
$optionArray = $this->getSizeByAuto($newWidth, $newHeight);
$optimalWidth = $optionArray['optimalWidth'];
$optimalHeight = $optionArray['optimalHeight'];
break;
case 'crop':
$optionArray = $this->getOptimalCrop($newWidth, $newHeight);
$optimalWidth = $optionArray['optimalWidth'];
$optimalHeight = $optionArray['optimalHeight'];
break;
}
return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
}
## --------------------------------------------------------
private function getSizeByFixedHeight($newHeight)
{
$ratio = $this->width / $this->height;
$newWidth = $newHeight * $ratio;
return $newWidth;
}
private function getSizeByFixedWidth($newWidth)
{
$ratio = $this->height / $this->width;
$newHeight = $newWidth * $ratio;
return $newHeight;
}
private function getSizeByFluidWidth($newHeight)
{
// *** Rob, 2010
// *** Get optimal width when we don't care about the width (NULL width)
$ratio = 1;
$ratio = ($this->height > $this->width)?$this->height / $this->width:$this->width / $this->height;
$newWidth = $ratio * $newHeight;
return $newWidth;
}
private function getSizeByFluidHeight($newWidth)
{
// *** Rob, 2010
// *** Get optimal height when we don't care about the height (NULL height)
$ratio = 1;
$ratio = ($this->height > $this->width)?$this->height / $this->width:$this->width / $this->height;
$newHeight = $ratio * $newWidth;
return $newHeight;
}
private function getSizeByAuto($newWidth, $newHeight)
{
if (!isset($newHeight)) {
$newHeight = $this->getSizeByFluidHeight($newWidth);
}
if (!isset($newWidth)) {
$newWidth = $this->getSizeByFluidWidth($newHeight);
}
if ($this->height < $this->width) {
// *** Image to be resized is wider (landscape)
$optimalWidth = $newWidth;
$optimalHeight= $this->getSizeByFixedWidth($newWidth);
} elseif ($this->height > $this->width) {
// *** Image to be resized is taller (portrait)
$optimalWidth = $this->getSizeByFixedHeight($newHeight);
$optimalHeight= $newHeight;
} else {
// *** Image to be resizerd is a square
if ($newHeight < $newWidth) {
$optimalWidth = $newWidth;
$optimalHeight= $this->getSizeByFixedWidth($newWidth);
} elseif ($newHeight > $newWidth) {
$optimalWidth = $this->getSizeByFixedHeight($newHeight);
$optimalHeight= $newHeight;
} else {
// *** Sqaure being resized to a square
$optimalWidth = $newWidth;
$optimalHeight= $newHeight;
}
}
return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
}
## --------------------------------------------------------
private function getOptimalCrop($newWidth, $newHeight)
{
$heightRatio = $this->height / $newHeight;
$widthRatio = $this->width / $newWidth;
if ($heightRatio < $widthRatio) {
$optimalRatio = $heightRatio;
} else {
$optimalRatio = $widthRatio;
}
$optimalHeight = $this->height / $optimalRatio;
$optimalWidth = $this->width / $optimalRatio;
return array('optimalWidth' => $optimalWidth, 'optimalHeight' => $optimalHeight);
}
## --------------------------------------------------------
private function crop($optimalWidth, $optimalHeight, $newWidth, $newHeight)
{
// *** Find center - this will be used for the crop
$cropStartX = ($optimalWidth / 2) - ($newWidth /2);
$cropStartY = ($optimalHeight/ 2) - ($newHeight/2);
$crop = $this->imageResized;
//imagedestroy($this->imageResized);
// *** Now crop from center to exact requested size
$this->imageResized = imagecreatetruecolor($newWidth, $newHeight);
imagecopyresampled($this->imageResized, $crop, 0, 0, $cropStartX, $cropStartY, $newWidth, $newHeight, $newWidth, $newHeight);
}
## --------------------------------------------------------
public function saveImage($savePath, $imageQuality="100")
{
// *** Get extension
$extension = strrchr($savePath, '.');
$extension = strtolower($extension);
switch ($extension) {
case '.jpg':
case '.jpeg':
if (imagetypes() & IMG_JPG) {
imagejpeg($this->imageResized, $savePath, $imageQuality);
}
break;
case '.gif':
if (imagetypes() & IMG_GIF) {
imagegif($this->imageResized, $savePath);
}
break;
case '.png':
// *** Scale quality from 0-100 to 0-9
$scaleQuality = round(($imageQuality/100) * 9);
// *** Invert quality setting as 0 is best, not 9
$invertScaleQuality = 9 - $scaleQuality;
if (imagetypes() & IMG_PNG) {
imagepng($this->imageResized, $savePath, $invertScaleQuality);
}
break;
// ... etc
default:
// *** No extension - No save.
break;
}
imagedestroy($this->imageResized);
}
## --------------------------------------------------------
}
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