FIT Algorithm for resizing photos.

fit_adjust.js

/**
 * Adjust the resolution by scaling the height and width to fit the current
 * width and height of the pane.
 *
 * @param {string} originalResolution the resolution in object format
 * @param {string} maxResolutionthe resolution in object format
 *
 * @author Mohamed Mansour (http://mohamedmansour.com)
 */
var adjustResolution = function(originalResolution, maxResolution) {
  var width = originalResolution.width;
  var height = originalResolution.height;
  var maxWidth = maxResolution.width;
  var maxHeight = maxResolution.height;

  // Check if the current width is larger than the max
  if (width > maxWidth) {
    var ratio = maxWidth / width;
    height = height * ratio;
    width = width * ratio;
  }

  // Check if current height is larger than max
  if (height > maxHeight) {
    var ratio = maxHeight / height;
    height = maxHeight;
    width = width * ratio;
  }

  return {
    width: width,
    height: height
  };
};