moon = loadImage('L_O.jpg');

}

 var realWidth;

function setup() {

  createCanvas(windowWidth, windowHeight);

imageRatio = moon.height/moon.width;

print(imageRatio);

  realWidth=windowWidth

}

function draw() {

  background(225);

    var moonWidth;

  var moonHeight;

  moonWidth = moon.width;

  moonHeight= moon.height;

  if (windowWidth < realWidth) {

        moonWidth = windowWidth;

    moonHeight= moonWidth*imageRatio;

        //print("w: "+moonWidth+", h: "+moonHeight);

  }

  image(moon,0,0,moonWidth,moonHeight);

}