Image.php

<?php

Zend_Loader::loadClass('Zend_Filter');
Zend_Loader::loadClass('Nmc_Math_OrderedPair');
Zend_Loader::loadClass('Nmc_Image_Exception');

class Nmc_Image {

    const IMAGE_FORMAT_PNG = 0x1;
    const IMAGE_FORMAT_GIF = 0x2;
    const IMAGE_FORMAT_JPEG = 0x4;

    const ALIGN_VERTICAL_TOP = 0x01;
    const ALIGN_VERTICAL_MIDDLE = 0x02;
    const ALIGN_VERTICAL_BOTTOM = 0x04;
    const ALIGN_HORIZONTAL_LEFT = 0x10;
    const ALIGN_HORIZONTAL_CENTER = 0x20;
    const ALIGN_HORIZONTAL_RIGHT = 0x40;

    const _ALIGN_VERTICAL_MASK = 0x0F;
    const _ALIGN_HORIZONTAL_MASK = 0xF0;

    /**
     * Returns a new Nmc_Image object created from the image file
     *
     * @param string $filePath
     * @return Nmc_Image_Abstract
     * @throws Nmc_Image_Exception
     */
    public static function fromFile($filePath)
    {
        $fp = @fopen($filePath, 'r');
        if($fp !== false) {
            fclose($fp);
        } else {
            throw new Nmc_Image_Exception('$filePath does not exist or cannot be read');
        }

        $dim = @getimagesize($filePath);
		switch( $dim[2] )
		{
			case IMAGETYPE_GIF:
				$img = imagecreatefromgif($filePath);
				return new Nmc_Image_Gif($img);
			break;

			case IMAGETYPE_JPEG:
				$img = imagecreatefromjpeg($filePath);
				return new Nmc_Image_Jpeg($img);
			break;

			case IMAGETYPE_PNG:
				$img = imagecreatefrompng($filePath);
				return new Nmc_Image_Png($img);
			break;

			default:
			    throw new Nmc_Image_Exception('$filePath was not a valid image type' );
			break;
		}
    }

    /**
     * Returns a new Nmc_Image object created from the supplied resource
     *
     * @param gd_resource $imageResource
     * @return Nmc_Image_Abstract
     * @throws Nmc_Image_Exception
     */
    public static function fromResource($imageResource)
    {
        return new Nmc_Image_Png($imageResource);
    }

    /**
     * Returns a new Nmc_Image object of a blank image with specified
     * width, height, and optional color (defaults to transparent).
     *
     * @param Nmc_Math_OrderedPair $size
     * @param Nmc_Image_Color[optional] $backgroundColor
     * @return Nmc_Image_Abstract
     * @throws Nmc_Image_Exception
     *
     */

    public static function fromNewImage(Nmc_Math_OrderedPair $size, Nmc_Image_Color $backgroundColor = null)
    {
        if(!$size->inQuadrant(1)) {
            throw new Nmc_Image_Exception('$size must have dimensions > 0');
        }

        $newImg = imagecreatetruecolor($size->x, $size->y);
        if($backgroundColor == null) {
            $bgc = imagecolorallocatealpha($newImg, 0, 0, 0, 127);
        } else {
            $bgc = imagecolorallocatealpha($newImg,
                                           $backgroundColor->r,
                                           $backgroundColor->g,
                                           $backgroundColor->b,
                                           $backgroundColor->a);
        }
        imagealphablending($newImg, false);
        imagefilledrectangle($newImg, 0, 0, $size->x, $size->y, $bgc);
        imagealphablending($newImg, true);

        return new Nmc_Image_Png($newImg);
    }
}

?>