Load the chart in a graphics program and you can draw whatever suits you... including extending the time scale along the x axis. Take the last downswing, mirror it upside down and paste it as an upswing wherever you want it :) Seriously though, that's a useful measuring technique. Copy one price bar and drag it around the screen as a quasi-ruler of what happened on an important day to compare it to what happened on other days.
Market Data 
Markets 
AI
