You can modify the previous program slightly to create one that lets you draw on the screen just
by moving your finger in the air. If you stand and point your finger toward the depth sensor, your
fingertip is the closest item to the sensor. A program can work out whereabouts this point is in the
image and then draw pixels at this point. You have already seen that a program can create an array of
bytes that is then displayed as an image. This is how you created the depth camera view earlier. Now
you are going to use the depth information to control a drawing action in an array of bytes.