The GD class

Rendair · 12-28-2008, 06:05 PM

Hey all

I have started to develope a GD class that will allow you to do things like watermark images and also add reflections to images.

You can view an example of the results: http://www.mypubquiz.co.uk/showwatermark.php

How it works
There are to files at the moment one called reflection and one called watermark. This can be used to create the images.

for instance the following will produce a watermark over the image.

PHP Code:


			
<img src="watermark.php?file=http://www.chromewaves.net/images/interface/20061020batmanVsWolverine.jpg" />

And the following will produce a reflection off the image.

PHP Code:


			
<img src="reflection.php?file=http://www.chromewaves.net/images/interface/20061020batmanVsWolverine.jpg" />

You may be wondering about the reflection, because last time i wrote a tutorial on how to do it it came in 2 images. This new version has been changed and now will create it as a whole image so the reflection is actually part of the original image.

The two files like reflection.php file are just simple like the following.

PHP Code:


			
<?php
include("includes/gd.class.php");
$gd = new gd();
echo $gd->addReflection($_GET["file"]);
?>

As far as i can see this should work for any image, give or take as i have not done it for every type but will do.

Further Features

I shall also add a feature that creates thumbnails and stuff like that. I shall do that pretty soon. When i have some time.

PHP Code:


			
<?php
/**
     * 
     *  Copyright (c) 2009 TalkPHP
     *  Permission is hereby granted, free of charge, to any person obtaining a copy
     *  of this software and associated documentation files (the "Software"), to deal
     *  in the Software without restriction, including without limitation the rights
     *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     *  copies of the Software, and to permit persons to whom the Software is
     *  furnished to do so, subject to the following conditions:
     *
     *  The above copyright notice and this permission notice shall be included in
     *  all copies or substantial portions of the Software.
     *    
     *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     *  THE SOFTWARE.
     * 
     * 
     * @author Dale Mooney(Rendair) ~ http://www.jooney.co.uk
     *
     **/

class gd
{
    
    /**
    * Constructor
    */
    public function __contructor()
    {
        
    }
    
    /**
    * Add watermark to image
    */
    public function addWaterMark($path)
    {
        
        
        $imagesource =  $path;
        $filetype = substr($imagesource,strlen($imagesource)-4,4);
        $filetype = strtolower($filetype);
        
        if($filetype == ".gif")  
        {
            header('content-type: image/gif');
            $image = @imagecreatefromgif($imagesource);  
        }
        else if($filetype == ".jpg") 
        {
            header('content-type: image/jpeg');
            $image = @imagecreatefromjpeg($imagesource);  
        }
        else if($filetype == ".png") 
        {
            header('content-type: image/png');
            $image = @imagecreatefrompng($imagesource);  
        }
        
        $watermark = @imagecreatefrompng('images/watermark.png');
        $imagewidth = imagesx($image);
        $imageheight = imagesy($image);  
        $watermarkwidth =  imagesx($watermark);
        $watermarkheight =  imagesy($watermark);
        $startwidth = (($imagewidth - $watermarkwidth)/2);
        $startheight = (($imageheight - $watermarkheight)/2);
        
        imagecopy($image, $watermark,  $startwidth, $startheight, 0, 0, $watermarkwidth, $watermarkheight);
        imagejpeg($image,NULL,100);
        imagedestroy($image);
        imagedestroy($watermark); 
    }
    
    /**
    * Add Reflection to image
    */
    public function addReflection($img)
    {
        
        $imgName = $src;
        $size = getimagesize($img);      
        $imgImport = imagecreatefromjpeg($img);
        
        $imgName_w = $size[0];
        $imgName_h = $size[1];
        
        $gradientHeight = 100;
        
        // Create new blank image with sizes.
        $background = imagecreatetruecolor($imgName_w, $gradientHeight);  
        
        $gradientColor = "255 255 255"; //White
        $gradparts = explode(" ",$gradientColor); // get the parts of the  colour (RRR,GGG,BBB)
        $dividerHeight = 1;  
        $gradient_y_startpoint = $dividerHeight;
        $gdGradientColor=ImageColorAllocate($background,$gradparts[0],$gradparts[1],$gradparts[2]);  
        
        $newImage = imagecreatetruecolor($imgName_w, $imgName_h);
        for ($x = 0; $x < $imgName_w; $x++) {
        
            for ($y = 0; $y < $imgName_h; $y++)
            {
                imagecopy($newImage, $imgImport, $x, $imgName_h - $y - 1, $x, $y, 1, 1);
            }
        }
        
        // Add it to the blank background image
        imagecopymerge ($background, $newImage, 0, 0, 0, 0, $imgName_w, $imgName_h, 100);  
        
        //create from a the image so we can use fade out.
        $gradient_line = imagecreatetruecolor($imgName_w, 1);
        
        // Next we draw a GD line into our gradient_line
        imageline ($gradient_line, 0, 0, $imgName_w, 0, $gdGradientColor);
        header("Content-type: image/jpeg"); 
        
        $i = 0;
        $transparency = 0; //from 0 - 100
        
        while ($i < $gradientHeight) //create line by line changing as we go
        {
            imagecopymerge ($background, $gradient_line, 0,$gradient_y_startpoint, 0, 0, $imgName_w, 1, $transparency);
                
            $i++;
            $gradient_y_startpoint++;
            if ($transparency == 100) 
            {
                $transparency = 100;
            }
            else 
            {
                $transparency = $transparency + 1; 
            }
        }
            
        // Set the thickness of the line we're about to draw
        imagesetthickness ($background, $dividerHeight);
        
        // Draw the line
        imageline ($background, 0, 0, $imgName_w, 0, $gdGradientColor);  
            
        $firstPart = imagecreatetruecolor($imgName_w,($imgName_h + $gradientHeight));
        imagecopymerge ($firstPart,$imgImport,0,0,0,0,$imgName_w,$imgName_h,100);
        imagecopymerge ($firstPart,$background,0,$imgName_h,0,0,$imgName_w,$imgName_h,100);
            
        imagejpeg($firstPart, '', 100); //100 being the quality of image 100 Max(Best)
        imagedestroy($background);
        imagedestroy(gradient_line);
        imagedestroy(newImage);  
    }
    
    /**
    * Create a thumbnail of an image
    */
    public function thumbnail($src_img,$new_w)
    {
        header('content-type: image/jpeg');
        $src_img = imagecreatefromjpeg($src_img);

        $old_x= imageSX($src_img);
        $old_y= imageSY($src_img);
        
        if ($old_x > $old_y) 
        {
            $thumb_w=$new_w;
            $thumb_h=$old_y*($new_w/$old_x);
        }
        if ($old_x < $old_y) 
        {
            $thumb_w=$old_x*($new_w/$old_y);
            $thumb_h=$new_w;
        }
        if ($old_x == $old_y) 
        {
            $thumb_w=$new_w;
            $thumb_h=$new_w;
        }
        
        $dst_img=ImageCreateTrueColor($thumb_w,$thumb_h);
        imagecopyresampled($dst_img,$src_img,0,0,0,0,$thumb_w,$thumb_h,$old_x,$old_y); 
        imagejpeg($dst_img, '', 100); //100 being the quality of image 100 Max(Best)
        imagedestroy($dst_img);
    }
    
    /**
    * Create a thumbnail and save the results.
    */
    public function saveThumbnail($src_img,$new_w,$location)
    {
        //Coming soon
    }
    
    /**
    * Rotate image
    */
    public function rotateImage($image,$rotate)
    {
        header('content-type: image/jpeg');
        
        $src_img = imagecreatefromjpeg($image);
        $black = imagecolorallocate($src_img,255,255,255);
        
        $rotate = imagerotate($src_img,$rotate,$black);
        imagejpeg($rotate,'',100); 
        imagedestroy($rotate);
    }    
}
?>

Tanax · 12-28-2008, 06:27 PM

How about keeping it in one file?
And have it like:

PHP Code:


			
<img src="sourceImage.php?add=watermark&file=http://www.chromewaves.net/images/interface/20061020batmanVsWolverine.jpg" />

Also, there could be a way of doing multiple tasks in one link like such:

PHP Code:


			
<img src="sourceImage.php?create=thumb&add=reflection|watermark&file=http://www.chromewaves.net/images/interface/20061020batmanVsWolverine.jpg" />

(this is ofcourse clearly theoretical, but you get the point!

Tanax · 12-28-2008, 06:31 PM

Oh, and I have a really great thumbnail function in an image gallery class that I started working on before.. tell me if you want it.
The thing about it that's great is the mathematical logics in it, that allows you to specify a max width and height, and it will create thumb if the orig file exceeds that criterias. And it keeps the proportions of the orig file aswell!

Anyways, tell me if you want it. You could prob tweek it if you find it failing this script somewhere.

Rendair · 12-28-2008, 07:12 PM

Yeah sure send it to me. I did have one somewhere but cant find it.

Tanax · 12-28-2008, 10:00 PM

This function creates a thumbnail even if it's below the max size.. but you can change that.

php Code:

/**
     * Creates thumbnail of image and moves to thumbnail dir
     *
     * @return void
     */
    private function createThumb()
    {
        
        switch($_FILES[$this->form_inputName]['type'])
        {
            
            case 'image/jpeg':
                
                $srcimage = imagecreatefromjpeg($this->image_bigPath . $this->file_name);
                break;

            case 'image/gif':

                $srcimage = imagecreatefromgif($this->image_bigPath . $this->file_name);
                break;

            case 'image/png':
                
                $srcimage = imagecreatefrompng($this->image_bigPath . $this->file_name);
                break;
            
            default:
                
                $srcimage = imagecreatefromjpeg($this->image_bigPath . $this->file_name);
                
        }
        

        $srcimagex = imagesx($srcimage);
        $srcimagey = imagesy($srcimage);
        
        if($srcimagex > $this->thumb_width || $srcimagey > $this->thumb_height)
        {
            
            $diffx = $srcimagex - $this->thumb_width;
            $diffy = $srcimagey - $this->thumb_height;
            
            if($srcimagex > $srcimagey || $srcimagey > $srcimagex)
            {
                
                if($diffx > $diffy)
                {
                    
                    $ratio = $this->thumb_width / $srcimagex;
                    
                }
                
                elseif($diffy > $diffx)
                {
                    
                    $ratio = $this->thumb_height / $srcimagey;
                    
                }
                
                else 
                {
                    
                    $ratio = $this->thumb_width / $srcimagex;
                    
                }
                
            }
            
            else 
            {
                
                if($this->thumb_width > $this->thumb_height || $this->thumb_height > $this->thumb_width)
                {
                    
                    if($diffx > $diffy)
                    {
                        
                        $ratio = $this->thumb_width / $srcimagex;
                        
                    }
                    
                    elseif($diffy > $diffx)
                    {
                        
                        $ratio = $this->thumb_height / $srcimagey;
                        
                    }
                    
                    else 
                    {
                        
                        $ratio = $this->thumb_width / $srcimagex;
                        
                    }
                    
                }
                
                else 
                {
                    
                    $ratio = $this->thumb_height / $srcimagey;
                    
                }
                
            }

            $thumbwidth = $srcimagex * $ratio;
            $thumbheight = $srcimagey * $ratio;
            
            $thumbnail = imagecreatetruecolor($thumbwidth, $thumbheight);
            imagecopyresampled($thumbnail, $srcimage, 0, 0, 0, 0, $thumbwidth, $thumbheight, $srcimagex, $srcimagey);
            $success = imagejpeg($thumbnail, $this->image_thuPath . $this->file_name, 75);
            
            if($success)
            {
                
                $this->thumb_creation = 1;
                
            }
            
            else throw new Exception('Thumbnail creation did not work.');         

        }
        
        else
        {
            
            if(!imagejpeg($srcimage, $this->image_thuPath . $this->file_name, 75))
            {
                    
                throw new Exception('An error occured when creating a thumbnail.');
                        
            }
            
            else return true;
            
        }
        
    }