[RESOLVED] calculate image width and height

[ppowell]

Sorry folks, I'm on a roll!!!

I need to calculate the height or width of an image if you change either the width or height and don't change BOTH of them at the same time, this is to "vector" the image.

Here is the class method, it obviously doesn't work:

	/**
	 * Perform calculation solely upon re-entered width and height if a calculation percentage was not entered nor chosen.  Can be called statically
	 *
	 * @access protected
	 * @param int $width (reference)
	 * @param int $height (reference)
	 * @param int $origWidth
	 * @param int $origHeight
	 * @return array $dimArray Array consisting of recalculated width and height
 	 */
	function &calculate_width_and_height(&$width, &$height, $origWidth, $origHeight) {
		print_r("width = $width and origWidth = $origWidth and height = $height and origHeight = $origHeight<P>");
		if ((int)$origWidth === 0 || (int)$origHeight === 0) return array(); 									// TO AVOID DIVISION BY ZERO
		if ((int)$origWidth !== (int)$width && (int)$origHeight !== (int)$height) return array($width, $height);	// NO NEED TO CALCULATE SINCE CHANGING ALL DIMENSIONS
		if ((int)$origWidth !== (int)$width) $height = $height / ($width / $origWidth);
		if ((int)$origHeight !== (int)$height) $width = $width / ($height / $origHeight);
		print_r("width = $width and origWidth = $origWidth and height = $height and origHeight = $origHeight<P>");
		return array($width, $height);
	}

Ok, folks, what on earth do I do? The calculations are horrifically wrong. How do I fix this? The values of $width and $height are entered via FORM posts.

Phil

[ppowell]

in case anyone wants it, here it is, fixed:

	/**
	 * Perform calculation solely upon re-entered width and height if a calculation percentage was not entered nor chosen.  Can be called statically
	 *
	 * @access protected
	 * @param int $width (reference)
	 * @param int $height (reference)
	 * @param int $origWidth
	 * @param int $origHeight
	 * @return array $dimArray Array consisting of recalculated width and height
 	 */
	function &calculate_width_and_height(&$width, &$height, $origWidth, $origHeight) {
		if ((int)$origWidth === 0 || (int)$origHeight === 0) return array($width, $height); 					// TO AVOID DIVISION BY ZERO
		if ((int)$origWidth !== (int)$width && (int)$origHeight !== (int)$height) return array($width, $height);	// NO NEED TO CALCULATE SINCE CHANGING ALL DIMENSIONS
		if ((int)$origWidth !== (int)$width) $height = $width * ($origHeight / $origWidth);
		if ((int)$origHeight !== (int)$height) $width = $height * ($origWidth / $origHeight);
		return array(floor($width), floor($height));
	}

Phil