April 10, 2017

Image helper file for CodeIgniter

Image helper file  for Codeigniter to edit, resize and get image parameters.

<?php
class Image {
private $file;
private $image;
private $width;
private $height;
private $bits;
private $mime;

public function __construct($file) {
if (file_exists($file)) {
$this->file = $file;

$info = getimagesize($file);

$this->width = $info[0];
$this->height = $info[1];
$this->bits = isset($info[‘bits’]) ? $info[‘bits’] : ”;
$this->mime = isset($info[‘mime’]) ? $info[‘mime’] : ”;

if ($this->mime == ‘image/gif’) {
$this->image = imagecreatefromgif($file);
} elseif ($this->mime == ‘image/png’) {
$this->image = imagecreatefrompng($file);
} elseif ($this->mime == ‘image/jpeg’) {
$this->image = imagecreatefromjpeg($file);
}
} else {
exit(‘Error: Could not load image ‘ . $file . ‘!’);
}
}

public function getFile() {
return $this->file;
}

public function getImage() {
return $this->image;
}

public function getWidth() {
return $this->width;
}

public function getHeight() {
return $this->height;
}

public function getBits() {
return $this->bits;
}

public function getMime() {
return $this->mime;
}

public function save($file, $quality = 90) {
$info = pathinfo($file);

$extension = strtolower($info[‘extension’]);

if (is_resource($this->image)) {
if ($extension == ‘jpeg’ || $extension == ‘jpg’) {
imagejpeg($this->image, $file, $quality);
} elseif ($extension == ‘png’) {
imagepng($this->image, $file);
} elseif ($extension == ‘gif’) {
imagegif($this->image, $file);
}

imagedestroy($this->image);
}
}

public function resize($width = 0, $height = 0, $default = ”) {
if (!$this->width || !$this->height) {
return;
}

$xpos = 0;
$ypos = 0;
$scale = 1;

$scale_w = $width / $this->width;
$scale_h = $height / $this->height;

if ($default == ‘w’) {
$scale = $scale_w;
} elseif ($default == ‘h’) {
$scale = $scale_h;
} else {
$scale = min($scale_w, $scale_h);
}

if ($scale == 1 && $scale_h == $scale_w && $this->mime != ‘image/png’) {
return;
}

$new_width = (int)($this->width * $scale);
$new_height = (int)($this->height * $scale);
$xpos = (int)(($width – $new_width) / 2);
$ypos = (int)(($height – $new_height) / 2);

$image_old = $this->image;
$this->image = imagecreatetruecolor($width, $height);

if ($this->mime == ‘image/png’) {
imagealphablending($this->image, false);
imagesavealpha($this->image, true);
$background = imagecolorallocatealpha($this->image, 255, 255, 255, 127);
imagecolortransparent($this->image, $background);
} else {
$background = imagecolorallocate($this->image, 255, 255, 255);
}

imagefilledrectangle($this->image, 0, 0, $width, $height, $background);

imagecopyresampled($this->image, $image_old, $xpos, $ypos, 0, 0, $new_width, $new_height, $this->width, $this->height);
imagedestroy($image_old);

$this->width = $width;
$this->height = $height;
}

public function watermark($watermark, $position = ‘bottomright’) {
switch($position) {
case ‘topleft’:
$watermark_pos_x = 0;
$watermark_pos_y = 0;
break;
case ‘topcenter’:
$watermark_pos_x = intval(($this->width – $watermark->getWidth()) / 2);
$watermark_pos_y = 0;
break;
case ‘topright’:
$watermark_pos_x = $this->width – $watermark->getWidth();
$watermark_pos_y = 0;
break;
case ‘middleleft’:
$watermark_pos_x = 0;
$watermark_pos_y = intval(($this->height – $watermark->getHeight()) / 2);
break;
case ‘middlecenter’:
$watermark_pos_x = intval(($this->width – $watermark->getWidth()) / 2);
$watermark_pos_y = intval(($this->height – $watermark->getHeight()) / 2);
break;
case ‘middleright’:
$watermark_pos_x = $this->width – $watermark->getWidth();
$watermark_pos_y = intval(($this->height – $watermark->getHeight()) / 2);
break;
case ‘bottomleft’:
$watermark_pos_x = 0;
$watermark_pos_y = $this->height – $watermark->getHeight();
break;
case ‘bottomcenter’:
$watermark_pos_x = intval(($this->width – $watermark->getWidth()) / 2);
$watermark_pos_y = $this->height – $watermark->getHeight();
break;
case ‘bottomright’:
$watermark_pos_x = $this->width – $watermark->getWidth();
$watermark_pos_y = $this->height – $watermark->getHeight();
break;
}

imagealphablending( $this->image, true );
imagesavealpha( $this->image, true );
imagecopy($this->image, $watermark->getImage(), $watermark_pos_x, $watermark_pos_y, 0, 0, $watermark->getWidth(), $watermark->getHeight());

imagedestroy($watermark->getImage());
}

public function crop($top_x, $top_y, $bottom_x, $bottom_y) {
$image_old = $this->image;
$this->image = imagecreatetruecolor($bottom_x – $top_x, $bottom_y – $top_y);

imagecopy($this->image, $image_old, 0, 0, $top_x, $top_y, $this->width, $this->height);
imagedestroy($image_old);

$this->width = $bottom_x – $top_x;
$this->height = $bottom_y – $top_y;
}

public function rotate($degree, $color = ‘FFFFFF’) {
$rgb = $this->html2rgb($color);

$this->image = imagerotate($this->image, $degree, imagecolorallocate($this->image, $rgb[0], $rgb[1], $rgb[2]));

$this->width = imagesx($this->image);
$this->height = imagesy($this->image);
}

private function filter() {
$args = func_get_args();

call_user_func_array(‘imagefilter’, $args);
}

private function text($text, $x = 0, $y = 0, $size = 5, $color = ‘000000’) {
$rgb = $this->html2rgb($color);

imagestring($this->image, $size, $x, $y, $text, imagecolorallocate($this->image, $rgb[0], $rgb[1], $rgb[2]));
}

private function merge($merge, $x = 0, $y = 0, $opacity = 100) {
imagecopymerge($this->image, $merge->getImage(), $x, $y, 0, 0, $merge->getWidth(), $merge->getHeight(), $opacity);
}

private function html2rgb($color) {
if ($color[0] == ‘#’) {
$color = substr($color, 1);
}

if (strlen($color) == 6) {
list($r, $g, $b) = array($color[0] . $color[1], $color[2] . $color[3], $color[4] . $color[5]);
} elseif (strlen($color) == 3) {
list($r, $g, $b) = array($color[0] . $color[0], $color[1] . $color[1], $color[2] . $color[2]);
} else {
return false;
}

$r = hexdec($r);
$g = hexdec($g);
$b = hexdec($b);

return array($r, $g, $b);
}
}

 

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