getScaledDimension.coffee

class Dimension
    constructor: (@width, @height) ->

getScaledDimension = (size, boundary) ->
    original =
        width: size.width
        height: size.height

    bound =
        width: boundary.width
        height: boundary.height

    newsize =
        width: original.width
        height: original.height

    if original.width > bound.width
        newsize.width = bound.width
        newsize.height = (newsize.width * original.height) / original.width

    if newsize.height > bound.height
        newsize.height = bound.height
        newsize.width = (newsize.height * original.width) / original.height

    return new Dimension newsize.width, newsize.height

getScaledDimension.js

var Dimension, getScaledDimension;

Dimension = (function() {
  function Dimension(width, height) {
    this.width = width;
    this.height = height;
  }

  return Dimension;

})();

getScaledDimension = function(size, boundary) {
  var bound, newsize, original;
  original = {
    width: size.width,
    height: size.height
  };
  bound = {
    width: boundary.width,
    height: boundary.height
  };
  newsize = {
    width: original.width,
    height: original.height
  };
  if (original.width > bound.width) {
    newsize.width = bound.width;
    newsize.height = (newsize.width * original.height) / original.width;
  }
  if (newsize.height > bound.height) {
    newsize.height = bound.height;
    newsize.width = (newsize.height * original.width) / original.height;
  }
  return new Dimension(newsize.width, newsize.height);
};