show the whole demo

Change-Id: I8e3adae6ef23c7750de0bcb5934d5743e24fde58
show the screen text after the performance improvements

Change-Id: I09d0bfe06e3fbb93f65587a847133fb1b3a3f2b2
improve the algorithm for the zoom into a bar

Change-Id: Id045cbeaa057fd264a50f83fb58bbee60df71299