This screen is accessible from the main chart screen, pressing “Line”.

Screenshot 2013.09.23 13.10.49

Define the first point using a pan gesture
pan one finger. Pan with one finger to the point you want the line pivot to be. When you remove your finger off the screen, the point is highlighted in red.

Screenshot 2013.09.23 13.34.45

Define the second point using a pan gesture
pan one finger. While panning, you can see a preview of the future line.

Screenshot 2013.09.23 13.35.20

Once you remove your finger off screen, the retracement is created.

Screenshot 2013.09.23 13.35.26