Codice PHP:
<?
/*
* class.Thumbnail.php
*
* Copyright (C) 2001 Hidayet Dogan (hdogan@bilcag.net)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
class Thumbnail {
var $errmsg = "";
var $error = false;
var $format = "";
var $file = "";
var $max_width = 0;
var $max_height = 0;
var $percent = 0;
var $percent = 0;
var $gd;
function Thumbnail($file, $max_width = 0, $max_height = 0, $percent = 0) {
if (!file_exists($file)) {
$file = "uploads/default.jpg";
// $this->errmsg = "File doesn't exist";
// $this->error = true;
}
else if (!is_readable($file)) {
$this->errmsg = "File is not readable";
$this->error = true;
}
if (strstr(strtolower($file), ".gif"))
$this->format = "GIF";
else if (strstr(strtolower($file), ".jpg") ||
strstr(strtolower($file), ".jpeg"))
$this->format = "JPEG";
else if (strstr(strtolower($file), ".png"))
$this->format = "PNG";
else {
$this->errmsg = "Unknown file format";
$this->error = true;
}
if ($max_width == 0 && $max_height == 0 && $percent == 0)
$percent = 100;
$this->max_width = $max_width;
$this->max_height = $max_height;
$this->percent = $percent;
$this->file = $file;
}
function gdVersion() {
if (! extension_loaded('gd')) { return; }
ob_start();
phpinfo(8);
$info=ob_get_contents();
ob_end_clean();
$info=stristr($info, 'gd version');
preg_match('/\d/', $info, $gd);
$this->$gd=$gd[0];
return $this->$gd;
}
function calc_width($width, $height) {
$new_width = $this->max_width;
$new_wp = (100 * $new_width) / $width;
$new_height = ($height * $new_wp) / 100;
return array($new_width, $new_height);
}
function calc_height($width, $height) {
$new_height = $this->max_height;
$new_hp = (100 * $new_height) / $height;
$new_width = ($width * $new_hp) / 100;
return array($new_width, $new_height);
}
function calc_percent($width, $height) {
$new_width = ($width * $this->percent) / 100;
$new_height = ($height * $this->percent) / 100;
return array($new_width, $new_height);
}
function return_value($array) {
$array[0] = intval($array[0]);
$array[1] = intval($array[1]);
return $array;
}
function calc_image_size($width, $height) {
$new_size = array($width, $height);
if ($this->max_width > 0) {
$new_size = $this->calc_width($width, $height);
if ($this->max_height > 0) {
if ($new_size[1] > $this->max_height)
$new_size = $this->calc_height($new_size[0], $new_size[1]);
}
return $this->return_value($new_size);
}
if ($this->max_height > 0) {
$new_size = $this->calc_height($width, $height);
return $this->return_value($new_size);
}
if ($this->percent > 0) {
$new_size = $this->calc_percent($width, $height);
return $this->return_value($new_size);
}
}
function show_error_image() {
header("Content-type: image/png");
$err_img = ImageCreatefromgd2(220, 25);
$bg_color = ImageColorAllocate($err_img, 0, 0, 0);
$fg_color1 = ImageColorAllocate($err_img, 255, 255, 255);
$fg_color2 = ImageColorAllocate($err_img, 255, 0, 0);
ImageString($err_img, 3, 6, 6, "ERROR:", $fg_color2);
ImageString($err_img, 3, 55, 6, $this->errmsg, $fg_color1);
ImagePng($err_img);
ImageDestroy($err_img);
}
function show() {
if ($this->error) {
$this->show_error_image();
return;
}
$size = GetImageSize($this->file);
$new_size = $this->calc_image_size($size[0], $size[1]);
$new_image = ($this->gdVersion()==2) ? ImageCreatefromgd2($new_size[0], $new_size[1]) : ImageCreate($new_size[0], $new_size[1]);
switch ($this->format) {
case "GIF":
$old_image = ImageCreateFromGif($this->file);
break;
case "JPEG":
$old_image = ImageCreateFromJpeg($this->file);
break;
case "PNG":
$old_image = ImageCreateFromPng($this->file);
break;
}
ImageCopyResized($new_image, $old_image, 0, 0, 0, 0, $new_size[0], $new_size[1], $size[0], $size[1]);
switch ($this->format) {
case "GIF":
header("Content-type: image/gif");
ImageGif($new_image);
break;
case "JPEG":
header("Content-type: image/jpeg");
ImageJpeg($new_image);
break;
case "PNG":
header("Content-type: image/png");
ImagePng($new_image);
break;
}
ImageDestroy($new_image);
ImageDestroy($old_image);
return;
}
}
?>
Potete anche non leggerla tutta in fondo sono 4 funzioni essenziali..
Rispondi quotando