proportionalScale

proportionalScale.js

function proportionalScale(originalSize, newSize){
    var ratio = originalSize[0] / originalSize[1];
    var maximizedToWidth = {width : newSize[0], height: (newSize[0] / ratio) };
    var maximizedToHeight = {width : newSize[1] * ratio, height: newSize[1]};

    if(maximizedToWidth[1] > newSize[1]) { 
      return maximizedToHeight; }
    else { 
      return maximizedToWidth; 
    }
}