Size Computer

jquery.size-computer.js

(function() {
  var SizeComputer, _computeWidth;

  _computeWidth = function(originWidth, baseWidth, refWidth) {
    var rate;
    rate = originWidth / baseWidth;
    return refWidth * rate;
  };

  SizeComputer = function(varArgs) {
    var defaults, opts, tgtCurWidth, verticalRate;
    defaults = {
      originWidth: 0,
      originHeight: 0,
      baseWidth: 800,
      maxBaseWidth: 800,
      refWidth: $(window).width()
    };
    opts = $.extend(defaults, {}, varArgs);
    if (opts.refWidth >= opts.maxBaseWidth) {
      opts.refWidth = opts.maxBaseWidth;
    }
    tgtCurWidth = _computeWidth(opts.originWidth, opts.baseWidth, opts.refWidth);
    verticalRate = opts.originHeight / opts.originWidth;
    return {
      width: tgtCurWidth,
      height: Math.round(tgtCurWidth * verticalRate)
    };
  };

  window.SizeComputer = SizeComputer;

}).call(this);