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canvas.php
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canvas.php
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<?php
include "imagecreatefrombmp.php";
class canvas{
private $file, $image, $temp_image;
private $width, $height, $new_width, $new_height, $html_size;
private $format, $extension, $size, $basename, $dirname;
private $rgb = array(255, 255, 255);
private $quality = 100;
private $crop_coordinates;
private $error = "";
private $image_formats = array(
"jpeg" => 2,
"jpg" => 2,
"gif" => 1,
"png" => 3,
"bmp" => 6
);
function __construct($file = null){
if($file){
$this->file = $file;
$this->image_info();
}
}
function load($file){
$this->file = $file;
$this->image_info();
if(!$this->error)
return $this;
else
return false;
}
function load_url($url){
$this->file = $url;
$this->file_info();
if(!$this->format){
$this->error = "Invalid image URL.";
return false;
}else{
$this->create_image();
$this->update_dimensions();
return $this;
}
}
private function image_info(){
if(is_file($this->file)){
$this->file_info();
if(!$this->is_image())
$this->error = "Invalid file. {$this->file} is not an image file.";
else
$this->create_image();
}else{
$this->error = "File not accessible/found.";
}
}
private function dimensions(){
list($this->width, $this->height, $this->html_size, $this->format) = getimagesize($this->file);
return $this;
}
private function update_dimensions(){
$this->width = imagesx($this->image);
$this->height = imagesy($this->image);
return $this;
}
private function file_info(){
$pathinfo = pathinfo($this->file);
$this->mime_type();
$this->basename = $pathinfo["basename"];
$this->dirname = $pathinfo["dirname"];
$this->format = (isset($this->image_formats[$this->extension]) ? $this->image_formats[$this->extension] : null);
}
private function mime_type(){
$size = getimagesize($this->file);
$mime_type = $size['mime'];
$mime_types = array(
'image/jpeg' => 'jpg',
'image/png' => 'png',
'image/gif' => 'gif',
'image/bmp' => 'bmp',
);
if(isset($mime_types[$mime_type]))
$this->extension = $mime_types[$mime_type];
else
$this->error = "Invalid mime type.";
}
private function is_image(){
$this->dimensions();
if(!$this->format)
return false;
else
return true;
}
function create_empty_image($width, $height, $extension = "jpg", $alpha = false){
if(!$width || !$height) return false;
$this->width = $width;
$this->height = $height;
$this->image = imagecreatetruecolor($this->width, $this->height);
if($alpha){
imagealphablending($this->image, false);
imagesavealpha($this->image, true);
$background_color = imagecolorallocatealpha($this->image, $this->rgb[0], $this->rgb[1], $this->rgb[2], $alpha);
}else{
$background_color = imagecolorallocate($this->image, $this->rgb[0], $this->rgb[1], $this->rgb[2]);
}
imagefill($this->image, 0, 0, $background_color);
$this->extension = $extension;
return $this;
}
private function create_image(){
$extension = ($this->extension == "jpg" ? "jpeg" : $this->extension);
$function_name = "imagecreatefrom{$extension}";
if(function_exists($function_name))
$this->image = $function_name($this->file);
else
$this->error = "Invalid image file or imagecreate function not enabled.";
return $this;
}
function set_rgb($rgb){
if(is_array($rgb)){
$this->rgb = $rgb;
return $this;
}elseif($this->hex_to_rgb($rgb)){
return $this;
}else{
return false;
}
}
private function hex_to_rgb($hex_color){
$hex_color = str_replace( "#", "", $hex_color );
if(strlen($hex_color) == 3) // #fff, #000 etc.
$hex_color .= $hex_color;
if(strlen($hex_color) != 6)
return false;
$this->rgb = array(
hexdec(substr($hex_color, 0, 2)),
hexdec(substr($hex_color, 2, 2)),
hexdec(substr($hex_color, 4, 2))
);
return $this;
}
function set_crop_coordinates($x, $y){
$this->crop_coordinates = array($x, $y, $this->width, $this->height);
return $this;
}
function resize($new_width = null, $new_height = null, $method = null){
if(!$new_width && !$new_height){
$this->error = "Inform a new width and/or a new height.";
return false;
}elseif(!is_resource($this->image)){
return false;
}
$this->new_width = $new_width;
$this->new_height = $new_height;
$this->calculate_new_dimensions();
if($method) $method = "resize_with_{$method}";
if(!method_exists($this, $method))
$method = "resize_with_no_method";
$this->$method()->update_dimensions();
return $this;
}
private function calculate_new_dimensions(){
$this->check_for_percentages();
if(!$this->new_width)
$this->new_width = $this->width/($this->height/$this->new_height);
elseif(!$this->new_height)
$this->new_height = $this->height/($this->width/$this->new_width);
}
private function check_for_percentages(){
if(strpos($this->new_width, "%"))
$this->new_width = round($this->width*(preg_replace("/[^0-9]/", "", $this->new_width)/100));
if(strpos($this->new_height, "%"))
$this->new_height = round($this->height*(preg_replace("/[^0-9]/", "", $this->new_height)/100));
}
private function resize_with_no_method(){
$this->temp_image = imagecreatetruecolor($this->new_width, $this->new_height);
imagecopyresampled($this->temp_image, $this->image, 0, 0, 0, 0,
$this->new_width, $this->new_height, $this->width, $this->height);
$this->image = $this->temp_image;
return $this;
}
private function fill(){
imagefill($this->temp_image, 0, 0,
imagecolorallocate($this->temp_image, $this->rgb[0], $this->rgb[1], $this->rgb[2]));
}
private function resize_with_fill(){
$this->temp_image = imagecreatetruecolor($this->new_width, $this->new_height);
$this->fill();
// centers image into the filled image area
// by width
if(($this->width/$this->height) >= ($this->new_width/$this->new_height)){
$dif_w = $this->new_width;
$dif_h = $this->height*($this->new_width/$this->width);
$dif_x = 0;
$dif_y = round(($this->new_height-$dif_h)/2);
// by height
}else{
$dif_w = $this->width*($this->new_height/$this->height);
$dif_h = $this->new_height;
$dif_x = round(($this->new_width-$dif_w)/2);
$dif_y = 0;
}
imagecopyresampled($this->temp_image, $this->image, $dif_x, $dif_y, 0, 0, $dif_w, $dif_h, $this->width, $this->height);
$this->image = $this->temp_image;
return $this;
}
private function resize_with_crop(){
if(!is_array($this->crop_coordinates))
$this->crop_coordinates = array(0, 0, $this->width, $this->height);
$this->temp_image = imagecreatetruecolor($this->new_width, $this->new_height);
$this->fill();
imagecopyresampled($this->temp_image, $this->image, $this->crop_coordinates[0],
$this->crop_coordinates[1], 0, 0, $this->crop_coordinates[2],
$this->crop_coordinates[3], $this->width, $this->height);
$this->image = $this->temp_image;
return $this;
}
function flip($orientation = "horizontal"){
$orientation = strtolower($orientation);
if($orientation != "horizontal" && $orientation != "vertical")
return false;
$w = imagesx($this->image);
$h = imagesy($this->image);
$this->temp_image = imagecreatetruecolor($w, $h);
$method = "flip_{$orientation}";
$this->$method($w, $h);
$this->image = $this->temp_image;
return $this;
}
private function flip_horizontal($w, $h){
for($x = 0; $x < $w; $x++)
imagecopy($this->temp_image, $this->image, $x, 0, $w - $x - 1, 0, 1, $h);
}
private function flip_vertical($w, $h){
for($y = 0; $y < $h; $y++)
imagecopy($this->temp_image, $this->image, 0, $y, 0, ($h - $y - 1), $w, 1);
}
function rotate($degrees){
$background_color = imagecolorallocate($this->image, $this->rgb[0], $this->rgb[1], $this->rgb[2]);
$this->image = imagerotate($this->image, $degrees, $background_color);
imagealphablending($this->image, true);
imagesavealpha($this->image, true);
$this->update_dimensions();
return $this;
}
function text($text, $options = array()){
if(!$text) return false;
if(!isset($options["size"]))
$options["size"] = 5;
if(isset($options["color"]))
$this->set_rgb($options["color"]);
$text_color = imagecolorallocate($this->image, $this->rgb[0], $this->rgb[1], $this->rgb[2]);
$dimensions = $this->text_dimensions($text, $options);
$options["x"] = isset($options["x"]) ? $options["x"] : 0;
$options["y"] = isset($options["y"]) ? $options["y"] : 0;
if(is_string($options["x"]) && is_string($options["y"]))
list($options["x"], $options["y"]) = $this->calculate_position($options["x"], $options["y"], $dimensions["width"], $dimensions["height"]);
if(isset($options["background_color"]) && $options["background_color"])
$this->text_background_color($dimensions, $options);
if(isset($options["truetype"]) && $options["truetype"])
$this->add_truetype_text($text, $text_color, $options);
else
imagestring($this->image, $options["size"], $options["x"], $options["y"], $text, $text_color);
return $this;
}
private function text_dimensions($text, $options){
if(isset($options["truetype"]) && $options["truetype"]){
$text_dimensions = imagettfbbox($options["size"], 0, $options["font"], $text);
return array($text_dimensions[4], $options["size"]);
}else{
if($options["size"] > 5)
$options["size"] = 5;
return array(
"width" => imagefontwidth($options["size"])*strlen($text),
"height" => imagefontheight($options["size"])
);
}
}
private function calculate_position($x, $y, $width, $height){
switch($y){
case "top":
default:
$y = 0;
break;
case "bottom":
$y = $this->height - $height;
break;
case "middle":
switch($x){
case "left":
case "right":
$y = ($this->height/2)-($height/2);
break;
case "center":
$y = ($this->height-$height)/2;
break;
}
break;
}
switch($x){
case "left":
default:
$x = 0;
break;
case "center":
$x = ($this->width-$width)/2;
break;
case "right":
$x = $this->width - $width;
break;
}
return array($x, $y);
}
private function text_background_color($dimensions, $options){
$this->set_rgb($options["background_color"]);
$this->temp_image = imagecreatetruecolor($dimensions["width"], $dimensions["height"]);
$background_color = imagecolorallocate($this->temp_image, $this->rgb[0], $this->rgb[1], $this->rgb[2]);
imagefill($this->temp_image, 0, 0, $background_color);
imagecopy($this->image, $this->temp_image, $options["x"], $options["y"], 0, 0, $dimensions["width"], $dimensions["height"]);
}
private function add_truetype_text($text, $text_color, $options){
imagettftext($this->image, $options["size"], 0, $options["x"], ($options["y"]+$options["size"]), $text_color, $options["font"], $text);
}
function merge($image, $position, $alpha = 100){
if(!file_exists($image)){
$this->error = "Invalid image.";
return false;
}
list($w, $h) = getimagesize($image);
if(is_string($position[0]) && is_string($position[1]))
$position = $this->calculate_position($position[0], $position[1], $w, $h);
$pathinfo = pathinfo($image);
$extension = strtolower($pathinfo["extension"]);
$extension = ($extension == "jpg" ? "jpeg" : $extension);
$function_name = "imagecreatefrom{$extension}";
if(function_exists($function_name))
$image_to_merge = $function_name($image);
else
$this->error = "Invalid image file or imagecreate function not enabled.";
list($x, $y) = $position;
if(is_numeric($alpha) && (($alpha > 0) && ($alpha < 100)))
imagecopymerge($this->image, $image_to_merge, $x, $y, 0, 0, $w, $h, $alpha);
else
imagecopy($this->image, $image_to_merge, $x, $y, 0, 0, $w, $h);
return $this;
}
function filter($filter, $ammount = 1, $args = array()){
if(!function_exists("imagefilter"))
return false;
$filter = strtolower($filter);
switch($filter){
case "blur":
case "gaussian_blur":
if(is_numeric($ammount) && $ammount > 1)
for($i = 1; $i <= $ammount; $i++)
imagefilter( $this->image, IMG_FILTER_GAUSSIAN_BLUR );
else
imagefilter( $this->image, IMG_FILTER_GAUSSIAN_BLUR );
break;
case "selective_blur":
if(is_numeric($ammount) && $ammount > 1)
for($i = 1; $i <= $ammount; $i++)
imagefilter( $this->image, IMG_FILTER_SELECTIVE_BLUR );
else
imagefilter( $this->image, IMG_FILTER_SELECTIVE_BLUR );
break;
case "brightness":
imagefilter($this->image, IMG_FILTER_BRIGHTNESS, $args[0]);
break;
case "grayscale":
imagefilter($this->image, IMG_FILTER_GRAYSCALE);
break;
case "colorize":
imagefilter($this->image, IMG_FILTER_COLORIZE, $args[0], $args[1], $args[2], $args[3]);
break;
case "contrast":
imagefilter($this->image, IMG_FILTER_CONTRAST, $args[0]);
break;
case "edge":
if(is_numeric($ammount) && $ammount > 1)
for($i = 1; $i <= $ammount; $i++)
imagefilter($this->image, IMG_FILTER_EDGEDETECT);
else
imagefilter($this->image, IMG_FILTER_EDGEDETECT);
break;
case "emboss":
if(is_numeric($ammount) && $ammount > 1)
for($i = 1; $i <= $ammount; $i++)
imagefilter($this->image, IMG_FILTER_EMBOSS);
else
imagefilter($this->image, IMG_FILTER_EMBOSS);
break;
case "negate":
imagefilter($this->image, IMG_FILTER_NEGATE);
break;
case "noise":
if(is_numeric($ammount) && $ammount > 1)
for($i = 1; $i <= $ammount; $i++)
imagefilter($this->image, IMG_FILTER_MEAN_REMOVAL);
else
imagefilter($this->image, IMG_FILTER_MEAN_REMOVAL);
break;
case "smooth":
if(is_numeric($ammount) && $ammount > 1)
for($i = 1; $i <= $ammount; $i++)
imagefilter($this->image, IMG_FILTER_SMOOTH, $args[0]);
else
imagefilter($this->image, IMG_FILTER_SMOOTH, $args[0]);
break;
case "pixelate":
if(is_numeric($ammount) && $ammount > 1)
for($i = 1; $i <= $ammount; $i++)
imagefilter($this->image, IMG_FILTER_PIXELATE, $args[0], $args[1]);
else
imagefilter($this->image, IMG_FILTER_PIXELATE, $args[0], $args[1]);
break;
default:
return false;
break;
}
return $this;
}
public function round($radius = 10, $colour = "FFFFFF") {
/* http://911-need-code-help.blogspot.com/2009/05/generate-images-with-round-corners-on.html
* radius: corner radius in pixels -- default value is 10
* colour: corner colour in rgb hex format -- default value is FFFFFF */
/* create mask for top-left corner in memory */
$corner_image = imagecreatetruecolor($radius, $radius);
$clear_colour = imagecolorallocate($corner_image, 0, 0, 0);
$solid_colour = imagecolorallocate($corner_image, hexdec(substr($colour, 0, 2)), hexdec(substr($colour, 2, 2)), hexdec(substr($colour, 4, 2)));
imagecolortransparent($corner_image, $clear_colour);
imagefill($corner_image, 0, 0, $solid_colour);
imagefilledellipse($corner_image, $radius, $radius, $radius * 2, $radius * 2, $clear_colour);
/* render the top-left, bottom-left, bottom-right, top-right corners by rotating and copying the mask */
$this->img_temp = $this->img;
imagecopymerge($this->img_temp, $corner_image, 0, 0, 0, 0, $radius, $radius, 100);
$corner_image = imagerotate($corner_image, 90, 0);
imagecopymerge($this->img_temp, $corner_image, 0, $this->altura - $radius, 0, 0, $radius, $radius, 100);
$corner_image = imagerotate($corner_image, 90, 0);
imagecopymerge($this->img_temp, $corner_image, $this->largura - $radius, $this->altura - $radius, 0, 0, $radius, $radius, 100);
$corner_image = imagerotate($corner_image, 90, 0);
imagecopymerge($this->img_temp, $corner_image, $this->largura - $radius, 0, 0, 0, $radius, $radius, 100);
/* output the image -- revise this step according to your needs */
$this->img = $this->img_temp;
return $this;
}
function set_quality($quality){
$this->quality = $quality;
return $this;
}
function save($destination){
if(!is_dir(dirname($destination))){
$this->error = "Invalid destination directory.";
return false;
}else{
return $this->output_image($destination);
}
}
function show(){
if(headers_sent()){
$this->error = "Headers already sent.";
return false;
}else{
header("Content-type: image/{$this->extension}");
$this->output_image();
imagedestroy($this->image);
exit;
}
}
private function output_image($destination = null){
$pathinfo = pathinfo($destination);
$extension = ($pathinfo["extension"] ? strtolower($pathinfo["extension"]) : $this->extension);
if($extension == "jpg" || $extension =="jpeg" || $extension == "bmp")
imagejpeg($this->image, $destination, $this->quality);
elseif($extension == "png")
imagepng($this->image, $destination);
elseif($extension == "gif")
imagegif($this->image, $destination);
else
return false;
}
function error_message(){
return $this->error;
}
}