aliroImage.php

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<?php

class aliroImage {
    private $path = '';
    private $image = null;

    public function __construct ($path) {
        $this->path = $path;
        $info = pathinfo($path);
        $type = $info['extension'];
        if ('jpg' == $type OR 'jpeg' == $type) $this->image = imagecreatefromjpeg($path);
        elseif ('png' == $type) $this->image = imagecreatefrompng($path);
        elseif ('gif' == $type) $this->image = imagecreatefromgif($path);
        else trigger_error (T_('Class aliroImage create - path has invalid extension - not jpg, jpeg, gif, png'), E_USER_ERROR);
    }
    
    //This function will resize any PNG or JPG or PNG image to whatever size you specify
    //It will keep aspect ratios.
    public function imgresize ($new_width, $new_height) {
        if (!$this->image) trigger_error (T_('Class aliroImage resize - no valid image created'), E_USER_ERROR);
        //grab original sizes
        $old_x=imagesx($this->image);
        $old_y=imagesy($this->image);

        // new math to figure aspect ratio
        $ratio = min($new_width/$old_x, $new_height/$old_y);
        $new_height = $old_y * $ratio;
        $new_width = $old_x * $ratio;

        //generate a blank final image
        $dst_img=ImageCreateTrueColor($new_width, $new_height);

        //this resamples the original image and I think uses bicub to create a new image
        imagecopyresampled($dst_img, $this->image, 0, 0, 0, 0, $new_width, $new_height, $old_x, $old_y);
    }
    
    public function saveAs ($path, $highQuality=false) {
        if (!$this->image) trigger_error (T_('Class aliroImage save - no valid image created'), E_USER_ERROR);
        //unlink it if it already exists in destination
        $info = pathinfo($path);
        $exts = array('jpg', 'jpeg', 'png', 'gif');
        if (in_array($info['extension'], $exts) {
            aliroFileManager::getInstance()->deleteFile($path);
            switch ($info['extension']) {
                case 'jpg':
                case 'jpeg':
                    if ($highQuality) imagejpeg($this->image, $path, 100);
                    else imagejpeg($this->image, $path);
                    break;
                case 'png':
                    if ($highQuality) imagepng($this->image, $path, 0);
                    else imagepng($this->image, $path);
                    break;
                case 'gif':
                    imagegif($this->image, $path);
                    break;
            }
        }       
        else trigger_error(T_('Class aliroImage save method - path has wrong extension'), E_USER_ERROR);
    }

}
    

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