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1<?php
2
3/*
4 
5Original version:
6    written by Jarrod Oberto
7    taken from http://net.tutsplus.com/tutorials/php/image-resizing-made-easy-with-php/
8 
9Example usage:
10    include("classes/Resize.php");
11    $resizer = new Resize('images/cars/large/input.jpg');
12    $resizer->resizeImage(150, 100, 0);
13    $resizer->saveImage('images/cars/large/output.jpg', 100);
14 
15*/
16
17Class Resize {
18    private $image;
19    private $width;
20    private $height;
21    private $imageResized;
22
23    function __construct($fileName){
24        $this->image    = $this->openImage($fileName);
25        $this->width    = imagesx($this->image);
26        $this->height   = imagesy($this->image);
27    }
28
29    private function openImage($file){
30        if (!is_file($file)){
31            throw new Exception("File {$file} doesn't exists");
32        }
33
34        switch(pathinfo($file, PATHINFO_EXTENSION)){
35            case 'jpg':
36            case 'jpeg': return imagecreatefromjpeg($file);
37            case 'gif':     return imagecreatefromgif($file);
38            case 'png':     return imagecreatefrompng($file);
39        }
40
41        throw new Exception("Invalid image extension for {$file}. Acceptable image types are jpg,jpeg,gif,png");
42    }
43
44    public function resizeImage($newWidth, $newHeight, $option='auto'){
45        list($width, $height) = $this->getDimensions($newWidth, $newHeight, $option);
46
47        $this->imageResized = imagecreatetruecolor($width, $height);
48        imagecopyresampled($this->imageResized, $this->image, 0, 0, 0, 0, $width, $height, $this->width, $this->height);
49
50        if ($option == 'crop'){
51            $this->crop($width, $height, $newWidth, $newHeight);
52        }
53    }
54
55    private function getDimensions($width, $height, $option){
56        switch ($option){
57            case 'portrait':    return array($this->getSizeByFixedHeight($height),  $height);
58            case 'landscape':   return array($width, $this->getSizeByFixedWidth($width));
59            case 'auto':        return $this->getSizeByAuto($width, $height);
60            case 'crop':        return $this->getOptimalCrop($width, $height);
61            case 'exact':
62            default:            return array($width, $height);
63        }
64    }
65
66    private function getSizeByFixedHeight($height){
67        return ($this->width / $this->height) * $height;
68    }
69
70    private function getSizeByFixedWidth($width){
71        return ($this->height / $this->width) * $width;
72    }
73
74    private function getSizeByAuto($width, $height){
75        if ($this->height < $this->width){
76            return array($width, $this->getSizeByFixedWidth($width));
77        }
78
79        if ($this->height > $this->width){
80            return array($this->getSizeByFixedHeight($height), $height);
81        }
82
83        if ($height < $width){
84            return array($width, $this->getSizeByFixedWidth($width));
85        }
86
87        if ($height > $width){
88            return array($this->getSizeByFixedHeight($height), $height);
89        }
90
91        return array($width, $height);
92    }
93
94    private function getOptimalCrop($width, $height){
95        $ratio = min($this->height / $height, $this->width /  $width);
96        return array(
97            $this->width  / $ratio,
98            $this->height / $ratio
99        );
100    }
101
102    private function crop($optimalWidth, $optimalHeight, $width, $height){
103        $x = ( $optimalWidth  / 2) - ( $width  /2 );
104        $y = ( $optimalHeight / 2) - ( $height /2 );
105
106        $crop = $this->imageResized;
107
108        $this->imageResized = imagecreatetruecolor($width , $height);
109        imagecopyresampled($this->imageResized, $crop, 0, 0, $x, $y, $width, $height , $width, $height);
110    }
111
112    public function saveImage($savePath, $imageQuality="100"){
113        switch(pathinfo($savePath, PATHINFO_EXTENSION)){
114            case 'jpg':
115            case 'jpeg':
116                if (imagetypes() & IMG_JPG){
117                    imagejpeg($this->imageResized, $savePath, $imageQuality);
118                }
119                break;
120
121            case 'gif':
122                if (imagetypes() & IMG_GIF){
123                    imagegif($this->imageResized, $savePath);
124                }
125                break;
126
127            case 'png':
128                if (imagetypes() & IMG_PNG){
129                    // Scale quality from 0-100 to 0-9
130                    // Invert quality setting as 0 is best, not 9
131                    $invertScaleQuality = 9 - round(($imageQuality/100) * 9);
132                    imagepng($this->imageResized, $savePath, $invertScaleQuality);
133                }
134                break;
135        }
136
137        imagedestroy($this->imageResized);
138    }
139}